HomeMy WebLinkAboutRH2 Engineering Amend No 2 Butterfield Intake No 9OMINALLPAGENO I OFtI PAGES
Contract Amendment No. 2
Butterfield Intake Pump No. 9 Condition Assessment
RH2 Project No. PSC 716.015
In accordance with our Professional Services Agreement for the Butterfield Intake Pump No. 9
Condition Assessment Project, dated January 27, 2016, this is an authorization to revise the project
Scope of Work as described below. The work will be performed and invoiced using the terms and
conditions listed in the original agreement, plus previous amendments and/or agreements.
Add the following items to the Scope of Work:
Additional services required to assess the condition of the West Pasco Water Treatment Plant
high -service pump. Please see attached Exhibit A and Exhibit B for the description of services.
The engineering fee authorization will increase by $4,109 for a total authorization amount of $9,772.
Please sign this authorization in the space provided below and mail or fax to RH2 Engineering, Inc.,
22722 29`s Drive SE, Suite 210, Bothell, WA 98021. FAX (425) 951-5401.
R112 Engineering, Inc.
City of Pasco
Signature Signature
Paul R. Cross, Executive Vice President
Print Name/Title
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Date
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ORIGINAL I PAGE NO�L OFL-1 PAGES
EXHIBIT A
Scope of Work
Amendment No. 2
City of Pasco
Butterfield Intake Pump No. 9 Condition Assessment
West Pasco Water Treatment Plant Evaluation
December 2016
Background
The City of Pasco's (City) West Pasco Water Treatment Plant (WPWTP) has two high -service
pumps that pump treated water to the City's Zone 1 pressure zone. The impeller on one of the
high -service pumps recently failed, and the City is concerned that the remaining high -service pump
may also be close to failure due to both of them similarly underperforming since the WPWTP was
initially commissioned.
RH2 Engineering, Inc., (RH2) performed a condition assessment of the City's Butterfield Intake
Water Treatment Plant pumps in 2016, and the City contacted RH2 on December 14, 2016,
requesting that RH2 assess the condition of the WPWTP high -service pump that is currently in
service. This Scope of Work includes the tasks necessary for RH2 to evaluate the condition of the
currently -in-service WPWTP high -service pump, and to document those results.
Task 1— System Head Curve Evaluation
Objective: Identify the design pumping conditions required for the WPWTP high -service pump(s).
Approach:
1.1 Review mechanical record drawings of the suction and discharge piping for the WPWTP
high -service pumps.
1.2 Develop a system head curve for the WPWTP high -service pump(s), and identify the
recommended total dynamic head (IDH) required for the pump(s) to meet the original design
flowrate. It is assumed that the design flowrate for each of the current high -service pumps is 3
million gallons per day (MGD), as identified on Sheet 15 of the WPWTP record drawings. The
system head curve will be developed for 0 to 6 MGD, to include the combined pumping rate of both
high -service pumps.
Task 2 — Pump and Motor Condition Assessment
Objective: Assess the condition of the currently operating WPWTP high -service pump and motor
Approach:
2.1 Collect data for the currently operating WPWTP high -service pump to conduct a frequency
vibration analysis, develop a pump curve, and calculate the TDH required for the pump at the
design pumping rate. It is assumed that the City will provide a water system operator to turn the
pump on and off, and to adjust valve settings, and that the City will provide an electrician to
conned RH2's electrical monitoring equipment into each control panel. It is also assumed that flow
meters and downstream pressure can be measured, or reasonably estimated during testing. Five
(5) data points will be tested for the pump, as follows:
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ORIGINAL I PAGENO_LOF 4 PAGES
City of Pasco Exhibit A
Butterfield Intake Pump No. 9 Condition Assessment Scope of Work
West Pasco Water Treatment Plant Evaluation Amendment No. 2
1— Operating at full speed flow and pressure.
2 — Operating at full speed with a partially throttled downstream valve (approximately
10 to 15 percent flow reduction from normal flows).
3 — Operating at full speed with a further -throttled downstream valve (approximately
20 to 30 percent flow reduction compared to normal flows).
4 — Operating at approximately 90 -percent speed without a throttled downstream valve.
5 — Operating at approximately 80 -percent speed without a throttled downstream valve.
2.2 Input field data into spreadsheets. Develop a pump curve for the pump. Analyze the vibration
frequencies measured for the pump and motor.
2.3 Compare the field-tested pump data with the published curve data provided by the
manufacturer. It is assumed that the City will provide pump curve data for the pump, or that the
City will authorize Rli2 to contact PumpTech, Inc., to obtain the applicable data.
2.4 Based on the results of the frequency vibration analysis, evaluate the following.
• Status of motor conditions, including rotors, static/dynamic eccentricities,
connection faults, and load -related issues; and
• Motor/pump bearing issues.
RH2 Deliverables:
One (1) PDF copy of a letter report signed and stamped by licensed professional engineers
presenting the recommended design point for the existing WPWTP high -service pump, and
the results of the existing condition and pumping characteristics of the WPWTP high -service
PUMP.
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OPoGINALLPAGE NO 4 OF_4—PAGES
EXHIBIT B
City of Pasco
Butterfield Intake Pump No. 9 Condition Assessment
Amendment No. 2
West Pasco Water Treatment Plant Evaluation
Fee Estimate
Task 1 SwtemHeadCurvelivaluation
9
S
SS39
S 481
$
1.567
1.1 Review mechanical record drawings
4
$
707
$ 27
$
734
1.2 TD—,—Ipyt,,had curve
5
$
812
$ 20
$
832
Task Pum and MOWCondition Assessment
1s
S
2,417
$ 125
S
2,542
2.1 Cdlect um curve and vibration data
2.2 Input field data, develop purne curve, and analyze vibration fre uencies
2
$
334
$ 8
$
342
23 ICDmpare pump curve data with published curve data
2
$
334
$ 8
$
342
2.4 Evaluate pump and motor condition based on vibretian results5
$
786
$ 65
$
851
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