The URL can be used to link to this page

RES 2012-0356 - PO to Allied Systems Inc for pump replacement at Missouri River WWTP I MAH+,NFB `, �'„dis RECEIVED Public Works Department c®R"x�+�►, ,i►,� ;� u Omaha/Douglas Civic Center jIC p+ 12 MAR -2 PM I: 4 j 1819 Farnam Street,Suite 601 oME_ ix � March 13, 2012 Omaha,Nebraska 68183-0601 Aop �� 'I f �' CLERK (402)444-5220 �l'Fo FEeR°r k _, Fax(402)444-5248 OMd11,�, uiLL3P,HSKA City of Omaha Robert G.Stubbe,P.E. Jim Suttle,Mayor Public Works Director Honorable President and Members of the City Council, Transmitted herewith is a Resolution authorizing the Purchasing Agent to issue a purchase order in the amount of$61,888.00 to Allied Systems, Inc. for two replacement digester mixing pumps at the Missouri River Wastewater Treatment Plant. In a 2009 evaluation, the condition and wear issues of the digester mixing pumps at the Missouri River Wastewater Treatment plant was completed and at that time it was recommended to completely replace the existing type of pump with a specific type of Vaughn pump. Two pumps were replaced at that time, and now that the remaining two pumps need to be replaced, it is requested that bidding procedures be waived in accordance with Section 5.16 of the Home Rule Charter of 1956 for the purchase of unique and non-competitive items, so that two new replacement pumps can be matched to those replaced in 2009. Allied Systems, Inc. will supply the replacement pumps as outlined in the attached Quotation dated 13 January, 2012. The total cost of the parts and freight for this purchase is $61,880.00 and will be paid from the Sewer Revenue Fund 21121, Missouri Treatment Plant Maintenance Organization 116613. Allied Systems, Inc. has filed the required Annual Contract Compliance Report Form in the Human Rights and Relations Department. The Public Works Department requests your consideration and approval of the attached Resolution. Respectfully submitted, Referred to City Council for Consideration: -u -I z. c72. 7 • (e,1— Ro ert G. Stubbe, P.E. Date Mayor's Of ce Date Public Works Director Approved as to Funding: Approved: ��,z a/�-7 ,a. Pam Spaccarotella ells Date Human Rights and Relations Date P g -69 Finance Director Department 1360htp t • 1 t.., ,. {, 1f ft>II ::Ya � +f' 1 -tE' e. N_24thStwe.--. _ . ---" -^ -t ..41r '"-- .. 4 7~. 4,t'Irz a 11.+ .`rn t* a f t t-Ls 17 , al,#•• '' • .a o 3,11 i= `� fN tY n�i'-� IL1. O i I. d� Z -- _lv-.N25thS-- . jt. ; y,l u ? i` }` vyti 'T 1 -T r� `I �ry *`tl��'�»"""" - :•w,�. 1.4 N � ...� x,.N�2`th Ave,.. s.. t Iy,,, T 1 t • • ;i.-I .4 1.N 26th Cir�j�` rl a �I' rii-,` yI:t., �1 ^6 • .. J � it' • s r/ .`, J. `_ \i • �r �� :` •J •1.1C '- N 27th Sl m,(• ,' S7�`1—' , - \ :' r'7t' LL.:) l ,, � .� r}.`' __. S"'' ____r„.,..t` }. ��r.. . .-I''"�•'.'''' _ i`°'r^ '_N.A Maaid 43.oN^ N•27th'St ,..j -._s.. rlf�lN.�L•. - dwea E N.3 1 --- Nortti'Freev+aY_SEA - -- - M ,(eMaey yuoN dwe , _ __ - a Mr080=1 oijn - - — , Y • i.N 28th Sti.t.,I..- --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _ Inter-Office Communication To: Heather Tippey Pierce, General Services Manager From: Michael Arends, Missouri River WWTP Manager Date: February 10, 2012 Subject: Replacement of Two Digester Mixing Pumps at the Missouri River WWTP In September of 2009, CH2MHILL completed an evaluation of the digester Mixing Pump Wear issues at the Missouri River WWTP. Its recommendation at that time was to install Vaughan Model HE10R12CS-160 Horizontal End Suction Bare Chopper Pumps with High Chrome Iron Parts for the wear surfaces. Quotations were sought from three manufacturers to meet the needs of the mixing system at that time. Due to several considerations in the evaluation, the Vaughan Chopper Pump option was the lowest cost alternative for pump replacement. The City purchased two replacement pumps in 2009 and now needs to replace the other two pumps in this installation. Based on satisfactory performance, an updated cost quotation for the Vaughan pump was received at $30,944.00 per unit delivered for a total cost of$61,888.00. Please prepare a resolution to Allied Systems, Inc. for approval by the City Council for this purchase. Funds for this contract should come from cost center 21121-116613-42417. A copy of the engineers' evaluation from 2009 and the price quotation are included as attachments. If you have any questions, please contact me at 444-3915 x203. replacement pumps can be matched to those replaced in 2009. Allied Systems, Inc. will supply the replacement pumps as outlined in the attached Quotation dated 13 January, 2012. The total cost of the parts and freight for this purchase is $61,880.00 and will be paid from the Sewer Revenue Fund 21121, Missouri Treatment Plant Maintenance Organization 116613. Allied Systems, Inc. has filed the required Annual Contract Compliance Report Form in the Human Rights and Relations Department. The Public Works Department requests your consideration and approval of the attached Resolution. Respectfully submitted, Referred to City Council for Consideration: -u -I z. c72. 7 • (e,1— Ro ert G. Stubbe, P.E. Date Mayor's Of ce Date Public Works Director Approved as to Funding: Approved: ��,z a/�-7 ,a. Pam Spaccarotella ells Date Human Rights and Relations Date P g -69 Finance Director Department 1360htp t • 1 t.., ,. {, 1f ft>II ::Ya � +f' 1 -tE' e. N_24thStwe.--. _ . ---" -^ -t ..41r '"-- .. 4 7~. 4,t'Irz a 11.+ .`rn t* a f t t-Ls 17 , al,#•• '' • .a o 3,11 i= `� fN tY n�i'-� IL1. O i I. d� Z -- _lv-.N25thS-- . jt. ; y,l u ? i` }` vyti 'T 1 -T r� `I �ry *`tl��'�»"""" - :•w,�. 1.4 N � ...� x,.N�2`th Ave,.. s.. t Iy,,, T 1 t • • ;i.-I .4 1.N 26th Cir�j�` rl a �I' rii-,` yI:t., �1 ^6 • .. J � it' • s r/ .`, J. `_ \i • �r �� :` •J •1.1C '- N 27th Sl m,(• ,' S7�`1—' , - \ :' r'7t' LL.:) l ,, � .� r}.`' __. S"'' ____r„.,..t` }. ��r.. . .-I''"�•'.'''' _ i`°'r^ '_N.A Maaid 43.oN^ N•27th'St ,..j -._s.. rlf�lN.�L•. - dwea E N.3 1 --- Nortti'Freev+aY_SEA - -- - M ,(eMaey yuoN dwe , _ __ - a Mr080=1 oijn - - — , Y • i.N 28th Sti.t.,I..- --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _ • ALLIED SYSTEMS, INC. 2200 East Douglas Ave.—Des Moines,IA 50313-515-223-6642—Fax 515-224-4648 21 Aspen Court—Council Bluffs,IA 51503-712-328-9002—Fax 712-328-8492 QUOTATION DATE: January 13, 2012 RE: Vaughan Pump OTY DESCRIPTION 1 EA VAUGHAN MODEL HE10R12CS-160 HORIZONTAL END SUCTION CHOPPER PUMP CONSISTING OF: - CASING, cast ductile iron. Casing shall be glass lined. Rotated to the 9:00 position. - BACK PULL-OUT PLATE,cast ductile iron - IMPELLER, UPPER CUTTER AND EXTERNAL CUTTER, cast Hi-Chrome iron. Impeller dynamically balanced. - CUTTER BAR,cast Hi-Chrome iron. - SHAFT,heat treated steel. - BEARINGS, ball type thrust and radial bearings, oil lubricated. - BEARING/PACKING HOUSING,cast ductile iron with sight glass. - FLUSHLESS MECHANICAL SEAL, cartridge type with SC or TC faces and integral shaft sleeve, as manufactured by Vaughan. - ELASTOMERS,BUNA N - FLANGES, 10" discharge & 12" inlet, 125 LB ANSI rated. Includes discharge and inlet pressure gages factory mounted for startup pressure verification. - CUSTOMER SUPPLIED DRIVE, 75 HP, 1750 RPM, 230/460/3/60, 1.15 SF, electric motor. - STANDARD FINISH: treated with solvent wash and coated with Rodda Acrylic Urethane. TOTAL NET PRICE: $29,844 ESTIMATED FREIGHT: $1,100 PUMP PERFORMANCE: 4,000 GPM @ 40 FT. TDH APPLICATION:DIGESTER MIXING INDUSTRY: WWTP QUOTATION BY: SCOTT OBERNOLTE enance Organization 116613. Allied Systems, Inc. has filed the required Annual Contract Compliance Report Form in the Human Rights and Relations Department. The Public Works Department requests your consideration and approval of the attached Resolution. Respectfully submitted, Referred to City Council for Consideration: -u -I z. c72. 7 • (e,1— Ro ert G. Stubbe, P.E. Date Mayor's Of ce Date Public Works Director Approved as to Funding: Approved: ��,z a/�-7 ,a. Pam Spaccarotella ells Date Human Rights and Relations Date P g -69 Finance Director Department 1360htp t • 1 t.., ,. {, 1f ft>II ::Ya � +f' 1 -tE' e. N_24thStwe.--. _ . ---" -^ -t ..41r '"-- .. 4 7~. 4,t'Irz a 11.+ .`rn t* a f t t-Ls 17 , al,#•• '' • .a o 3,11 i= `� fN tY n�i'-� IL1. O i I. d� Z -- _lv-.N25thS-- . jt. ; y,l u ? i` }` vyti 'T 1 -T r� `I �ry *`tl��'�»"""" - :•w,�. 1.4 N � ...� x,.N�2`th Ave,.. s.. t Iy,,, T 1 t • • ;i.-I .4 1.N 26th Cir�j�` rl a �I' rii-,` yI:t., �1 ^6 • .. J � it' • s r/ .`, J. `_ \i • �r �� :` •J •1.1C '- N 27th Sl m,(• ,' S7�`1—' , - \ :' r'7t' LL.:) l ,, � .� r}.`' __. S"'' ____r„.,..t` }. ��r.. . .-I''"�•'.'''' _ i`°'r^ '_N.A Maaid 43.oN^ N•27th'St ,..j -._s.. rlf�lN.�L•. - dwea E N.3 1 --- Nortti'Freev+aY_SEA - -- - M ,(eMaey yuoN dwe , _ __ - a Mr080=1 oijn - - — , Y • i.N 28th Sti.t.,I..- --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _ • TECHNICAL MEMORANDUM CH2MHILL Recommendations for Immediate Replacement of Digester Mixing Pumps at Missouri River WWTP PREPARED FOR: Michael Arends City of Omaha Missouri River Plant Manager PREPARED BY: Kenneth Clegg,PE Principal Mechanical Engineer CH2M HILL COPIES: Tom Heinemann/DEN DATE: August 19,2009 PROJECT NUMBER: 143893.CD.SU 1 . Summary of Mixing Pump Wear Problems The pump mixing systems for digesters at the Missouri River WWTP were installed and began operation in 2002[?]. Mixing systems pumps were Vaughan Chopper pumps supplied by Liquid Dynamics Corp. The mixing pumps must operate continuously for the digestion process to meet required process performance. Significant wear became evident after approximately four years service,which is a relatively short life expectancy for the service conditions and materials subject to wear. Engineers at Liquid Dynamics and Vaughan have studied the installation and condition of worn impellers and cutter bars,trying to find the root cause of excessive wear in this installation,when many other similar digester mixing applications have much longer wear life. Two of the four pumps have been refurbished with replacement of the wear components from maintenance stocks and purchase of some components. One of the pumps was replaced with a heavier design upgrade of the original pump by Vaughan. The fourth pump was replaced by a Wemco ChopFlow pump,which is used in some mixing systems by Liquid Dynamics. Currently,all of the pumps are worn to near the limits of hydraulic effectiveness and are unreliable with no stock of wear parts immediately available to the City. CH2M HILL has also studied the particulars of the installation,operation and equipment to recommend changes to improve system reliability. 2. Observations and Investigation Worn pump components have been inspected and material standards have been reviewed to understand the mechanisms of wear and to assess the applicability of materials to the conditions at the plant.Two types of wear were observed. There is a uniform surface abrasion at the back of the impeller where the incoming sludge stream is forced to change CVO/MIXING PUMP REPLACEMENT RECOMMENDATION 1 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL ations Date P g -69 Finance Director Department 1360htp t • 1 t.., ,. {, 1f ft>II ::Ya � +f' 1 -tE' e. N_24thStwe.--. _ . ---" -^ -t ..41r '"-- .. 4 7~. 4,t'Irz a 11.+ .`rn t* a f t t-Ls 17 , al,#•• '' • .a o 3,11 i= `� fN tY n�i'-� IL1. O i I. d� Z -- _lv-.N25thS-- . jt. ; y,l u ? i` }` vyti 'T 1 -T r� `I �ry *`tl��'�»"""" - :•w,�. 1.4 N � ...� x,.N�2`th Ave,.. s.. t Iy,,, T 1 t • • ;i.-I .4 1.N 26th Cir�j�` rl a �I' rii-,` yI:t., �1 ^6 • .. J � it' • s r/ .`, J. `_ \i • �r �� :` •J •1.1C '- N 27th Sl m,(• ,' S7�`1—' , - \ :' r'7t' LL.:) l ,, � .� r}.`' __. S"'' ____r„.,..t` }. ��r.. . .-I''"�•'.'''' _ i`°'r^ '_N.A Maaid 43.oN^ N•27th'St ,..j -._s.. rlf�lN.�L•. - dwea E N.3 1 --- Nortti'Freev+aY_SEA - -- - M ,(eMaey yuoN dwe , _ __ - a Mr080=1 oijn - - — , Y • i.N 28th Sti.t.,I..- --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _ • RECOMMENDATIONS FOR IMMEDIATE REPLACEMENT OF DIGESTER MIXING PUMPS AT MISSOURI RIVER WWTP direction from direct impingement on the back plate to a radial flow along the impeller vanes and discharge to the volute.The wear pattern is common to digester mixing pumps and does not appear to effect impeller performance or longevity any greater than would be expected for the service.The other type of wear observed is a pitting erosion of the impeller vanes and stationary cutter bars. This loss of material is more serious than abrasion because it can quickly penetrate castings and weaken the structure,resulting in failure and possible damage to other pump components if operation is continued beyond clear evidence that pitting is occurring. Pitting corrosion is most severe on the low pressure side of impeller vanes and the cutter bar where local fluid velocity is higher than average and where cavitation may be occurring. Cavitation is the formation of small vapor cavities where local pressure falls below the fluid vapor pressure. Cavitation damage can result when the vapor cavities collapse upon a rise in local pressure above the fluid vapor pressure.The energy released by the collapsing cavities can erode metal if the collapse occurs at or near metal surfaces. Piping and system hydraulic requirements have been reviewed to determine if the pumps are properly matched to the mixing system at the mixing system manufacturer's design flow. The pump design condition of 40 feet of head at 4000 gallons per minute is the pump rated condition and this is supported by the calculation review. Pump suction piping is large enough to keep velocity in the desired range (6.4 feet per second) and the velocity is accelerated for entrance to the impeller by a standard reducer. The suction isolation valve and pump inlet reducer accelerate the flow to 11.3 feet per second,which is a beneficial condition for countering undesirable prerotation and produces a good velocity distribution across the impeller eye. Pump wear material alloys and their applications were also reviewed.The existing Vaughan and Wemco pumps are fitted with impellers of ASTM A148 cast steel,heat treated to appropriate tensile strength and hardness. This material is common for machine components where a good balance of strength and hardness is needed. Strength and hardness can be increased,but must be balanced with impact strength,which will be decreased as hardness is increased. This material is not hard all the way through castings, since the heat treatment works quickly near the surface. Another wear material option that has been offered by mixing pump manufacturers Vaughan and Hayward Gordon,is a high-chrome iron,ASTM A532.The hardness of this material is slightly lower than the ASTM A148 cast steel,but hardness is not just at the surface of new castings,but is maintained deep into the casting section. This is the same alloy Liquid Dynamics has used for the mixing nozzles. 3. Conclusions Heavy damage to cutter bars and impellers is due to pitting corrosion and erosion from local cavitation action on material which initially wears well,but wears very quickly once the hard surface is penetrated. The pump's tendency to cavitate is approximated by its required net positive suction head (NPSHr). NPSHr is a standard pump performance parameter and is the absolute value of barometric head plus suction head and minus fluid vapor pressure where the pump head capacity falls 3 percent from the maximum head point on the performance curve with adequate suction head at the same flow. Net positive suction I CVO/MIXING PUMP REPLACEMENT RECOMMENDATIONS 2 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL - --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _ RECOMMENDATIONS FOR IMMEDIATE REPLACEMENT OF DIGESTER MIXING PUMPS AT MISSOURI RIVER WWTP head available (NPSHa) must exceed that required by some margin to assure that cavitation does not occur. NPSHa =Hbaro +Hsuction-Hvapor=NPSH available,feet of water where: Hbaro =33.9 feet water at sea level Hsuction=feet water suction static minus system losses Hvapor=feet water vapor pressure at application temperature Solution for the conditions at the Missouri River plant results in around 46 feet of suction head being available,which seem generous,but the pump manufacturer's NPSHr curves are based on clean water,generally at less than digester temperature. Digesting sludge includes gases and solids which will encourage vapor cavity formation at much lower NPSHa than calculated for clean water. Therefore,the pump required NPSH is only a relative indicator of the tendency to cavitate in this application. The pump with lowest NPSHr would be the pump most likely to survive the longest time. 4. Solutions and Recommendations Quotations were solicited from the three pump suppliers;Vaughan,Wemco and Hayward Gordon for pumps in the recommended high-chrome iron wear materials for impeller and cutter bars. Wemco has declined to quote because they are not satisfied that the system hydraulic conditions are adequately known to apply their pump without continued wear problems, but they have also not offered a high-chrome iron version of their pump. Field tests with the existing pumps are not meaningful because the impellers no longer can perform according to their factory test curves. Hayward Gordon offers two pump selections with the larger,higher priced selection offering lower operating speed and lower NPSHr(22 feet). The smaller,lower priced selection NPSHr is 26 feet.The larger pump would require significant changes to existing piping in the pump room to fit the suction and discharge sizes and locations. Pricing of these two selections is$29,750 and$33,250,F.O.B. to job site,with expected delivery of 16 weeks after receipt of order. Vaughan offers replacement with an improved design of the original mixing pump with a heavier bearing frame. I recommend replacement of the existing mixing pumps with the Vaughan Chopper pump in high-chrome iron wear materials because this pump has the lowest NPSHr of all proposals (19 feet) and the lowest price because three of the four existing pump bases,motors and belt drives may be used with the new pumps. Minor modifications to the piping at Digester No. 1 would be required to replace the Wemco pump installed there. The Wemco pump impeller is showing the same severe pitting corrosion as on the Vaughan pumps.Vaughan quotes these pumps at$27,732 each,F.O.B.,with expected delivery of 6 weeks after receipt of order. I CVO/MIXING PUMP REPLACEMENT RECOMMENDATIONS 3 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL mixing nozzles. 3. Conclusions Heavy damage to cutter bars and impellers is due to pitting corrosion and erosion from local cavitation action on material which initially wears well,but wears very quickly once the hard surface is penetrated. The pump's tendency to cavitate is approximated by its required net positive suction head (NPSHr). NPSHr is a standard pump performance parameter and is the absolute value of barometric head plus suction head and minus fluid vapor pressure where the pump head capacity falls 3 percent from the maximum head point on the performance curve with adequate suction head at the same flow. Net positive suction I CVO/MIXING PUMP REPLACEMENT RECOMMENDATIONS 2 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL - --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _ C-25A CITY OF OMAHA LEGISLATIVE CHAMBER Omaha,Nebraska RESOLVED BY THE CITY COUNCIL OF THE CITY OF OMAHA: WHEREAS, the City of Omaha is operating the Missouri River Wastewater Treatment Plant to treat and clean wastewater from the eastern part of the City; and, WHEREAS, the plant uses specialized mixing pumps as a part of this wastewater treatment process; and, WHEREAS, direct replacement of two existing mixing pumps with a specific type of Vaughn pump has been determined to be the most effective means of continuing operation of the treatment process, it is therefore recommended that the bidding procedures be waived in accordance with Section 5.16 of the Home Rule Charter of 1956 for the purchase of unique or non-competitive items and the replacement pumps will be supplied by Allied Systems, Inc as the sole source provider; and, WHEREAS, the cost of replacing these pumps for the Missouri River Wastewater Treatment Plant, as detailed in the attached documentation, is $61,888.00, which will be paid from the Sewer Revenue Fund 21121, Missouri Treatment Plant Maintenance Organization 116613. NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF OMAHA: THAT, as recommended by the Mayor, a Purchase Order to Allied Systems, Inc for replacement of two digester mixing pumps at the Missouri River Wastewater Treatment Plant, in accordance with Section 5.16 of the Home Rule Charter of 1956 for the purchase of unique or non-competitive items, is hereby approved. BE IT FURTHER RESOLVED: THAT, the Finance Department is authorized to pay the cost of this replacement in the amount of $61,888.00 from the Sewer Revenue Fund 21121, Missouri Treatment Plant Maintenance Organization 116613. 1359htp APPROVED AS TO FORM: . • Ae By /; ITY ATTORNEY DATE C un ilmember Adopted MAR 1 3 012 o CiyClerk 31 15 ) 12 Approved 4,.: .. Mayor J th an improved design of the original mixing pump with a heavier bearing frame. I recommend replacement of the existing mixing pumps with the Vaughan Chopper pump in high-chrome iron wear materials because this pump has the lowest NPSHr of all proposals (19 feet) and the lowest price because three of the four existing pump bases,motors and belt drives may be used with the new pumps. Minor modifications to the piping at Digester No. 1 would be required to replace the Wemco pump installed there. The Wemco pump impeller is showing the same severe pitting corrosion as on the Vaughan pumps.Vaughan quotes these pumps at$27,732 each,F.O.B.,with expected delivery of 6 weeks after receipt of order. I CVO/MIXING PUMP REPLACEMENT RECOMMENDATIONS 3 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL mixing nozzles. 3. Conclusions Heavy damage to cutter bars and impellers is due to pitting corrosion and erosion from local cavitation action on material which initially wears well,but wears very quickly once the hard surface is penetrated. The pump's tendency to cavitate is approximated by its required net positive suction head (NPSHr). NPSHr is a standard pump performance parameter and is the absolute value of barometric head plus suction head and minus fluid vapor pressure where the pump head capacity falls 3 percent from the maximum head point on the performance curve with adequate suction head at the same flow. Net positive suction I CVO/MIXING PUMP REPLACEMENT RECOMMENDATIONS 2 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL - --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _ k " ƒ a Et 7 \ \ 0 ƒo G ) § _ / n . C # _ �. 4 3 ° / k / 7 @ § § § § § m § @ a e = a o n . e / 0 § 3 ° s- §. � 9 E § - *0 , § ƒ 2 / ) / § \ § ? / § _ _ A S - c .J y 0 k 2 0 CI- \ f � � 7 q 1 CD CDCD _ 2 \ 90 6 \ / \ / • E o / n § 7 \...« 0 § = O e 0 ? /• \ / . ~ = \ _ @ 2 § a § _ f ri 0 m k �'� % K S \ ° \ \ n " \ k 2, m n § CD a. E •g � � ° + R R R 7'� n G E q p ! 11%� 1 ouri River Wastewater Treatment Plant, as detailed in the attached documentation, is $61,888.00, which will be paid from the Sewer Revenue Fund 21121, Missouri Treatment Plant Maintenance Organization 116613. NOW, THEREFORE, BE IT RESOLVED BY THE CITY COUNCIL OF THE CITY OF OMAHA: THAT, as recommended by the Mayor, a Purchase Order to Allied Systems, Inc for replacement of two digester mixing pumps at the Missouri River Wastewater Treatment Plant, in accordance with Section 5.16 of the Home Rule Charter of 1956 for the purchase of unique or non-competitive items, is hereby approved. BE IT FURTHER RESOLVED: THAT, the Finance Department is authorized to pay the cost of this replacement in the amount of $61,888.00 from the Sewer Revenue Fund 21121, Missouri Treatment Plant Maintenance Organization 116613. 1359htp APPROVED AS TO FORM: . • Ae By /; ITY ATTORNEY DATE C un ilmember Adopted MAR 1 3 012 o CiyClerk 31 15 ) 12 Approved 4,.: .. Mayor J th an improved design of the original mixing pump with a heavier bearing frame. I recommend replacement of the existing mixing pumps with the Vaughan Chopper pump in high-chrome iron wear materials because this pump has the lowest NPSHr of all proposals (19 feet) and the lowest price because three of the four existing pump bases,motors and belt drives may be used with the new pumps. Minor modifications to the piping at Digester No. 1 would be required to replace the Wemco pump installed there. The Wemco pump impeller is showing the same severe pitting corrosion as on the Vaughan pumps.Vaughan quotes these pumps at$27,732 each,F.O.B.,with expected delivery of 6 weeks after receipt of order. I CVO/MIXING PUMP REPLACEMENT RECOMMENDATIONS 3 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL mixing nozzles. 3. Conclusions Heavy damage to cutter bars and impellers is due to pitting corrosion and erosion from local cavitation action on material which initially wears well,but wears very quickly once the hard surface is penetrated. The pump's tendency to cavitate is approximated by its required net positive suction head (NPSHr). NPSHr is a standard pump performance parameter and is the absolute value of barometric head plus suction head and minus fluid vapor pressure where the pump head capacity falls 3 percent from the maximum head point on the performance curve with adequate suction head at the same flow. Net positive suction I CVO/MIXING PUMP REPLACEMENT RECOMMENDATIONS 2 COPYRIGHT 2012 BY CH2M HILL,INC.•COMPANY CONFIDENTIAL - --_..x G,. . .0 9 ��t; , ll 1 _ _ 1. �i N 28th Ave` ` 1 ; kn �I dti It,� �• l • 1�F�4{j�1�� tk T rCJO LII) i : ' -.,..k t i� . , _„1 l�1 L '1�� 5 . Iig; of . 1:4y ''IL •I' 3f G- . .? 0 1 • Task Fee l SO S0 $0 S0 SO SO S0 I I , TASK l•ACOMONAL SERVICES I Additional Topographic Survey I S0 S0 , ,,.. Additional CCTV I S0 S0 Additional Level MareMe Condition AssnammI S0 S0 Community Enhancements I SO S0 4.1 Heavy Clearing I SO SO Task Naas 0 0 0 0 Task Fee S0 S0 S0 S0 S0 S0 SO I TOTAL I Hag. 1 60 24 32 60 6 l 2e i . -Foe I S4,960 $2,880 $2,080 $8,938 I 81,050 S372 $2,23i _ $9,728 Summary by Firm Veenflra._6 Kinnn,Rro EON� _- • Lovcten Martafina r. OW_ Ermineerbg 6 Sur_Y_eotno ' TREKK , Thiele Cleated,,Mn. Taal Labor Nam , Total Fee "robed FepWry 6 2012 I • • • • lrmd Surveying TREKK ..- Thiele Geotede Inc. Total Labor Hours TOUIFee ) J eO PAeuen62012 I 81.310 10 31.310 10 2 1, 4 Taos Noon. 1.278 1.110 65 258 107 150 28 116 4 36 28 18 T.:RFee 2154,580 8118757 $8,775 $33,540 $13,910 $15,0W $2,108 $30,368 2520 82,520_ $1,590 51,170 $5,950 TASK 3-PERMITTING SERVICES - ' 3.I Deve1000eyelonprellmin.ry LIM of Erw1rmnant 22.730 18 82.730 18 4 4 8 2 500 �.2 PMT ogmwimce Re le:;of Permits "�' 32.n0 22 $2.770 22 8 4 8 2 3.0 PetmRS - - - _ 22.230 18 82,230 18 4 6 6 2 _n.R HOU1. 68 40 12 8 16 0 0 0 0 0 0 4 Task Fee 27,730 $5,500 21,620 $1,040 22,060 SO iD SO SO 30 50 3260 $500 I TASK 1-AOOMONAL SERVICES Additional T0n00aoMc Sun8y S0 S0 Addit10ral CCTV_- ____ 80 20 • Addllteral Level 1ManticCOMltion Assessment 80 $0 OammeJlr ErheneenantS 30 S0 4.1 NeaW Cleantm 80 SO 1-84 _ 0 0 0 0 0 0 0 0 0 0, Task Fee 80 80 20 SO S0 S0 30 S0 SO SO S0 $0 SO • TOTAL ' Haas 1.983 1.464 I 192 344 190 150 38 420 6 36 26 62 Fee $718,095 $160,172 525,820 511,720 224,700 S15000 23,096 $30,660 $780 $2,520 $1,596 $1,030 27.150 S,nnan by Finn 8 MRS Veenalra 8 Kimm,Inc $160,172 1464 . EFI2 215.200 150 t.0vaen Markellm 236,870 235 RW Ergineerim 6 Surveying 81,860 56 • TREKK _ _ $8.938 60 Thiele Ge01eeh Inc. 39,725 TO8M L.bm Horn 1.865 Total Fee • 3235,865 Revised Fe0NKv 6 2012 . I I I _ _