Dewatering Centrifuge Repair Services

REQUEST FOR PROPOSAL (RFP)
for Dewatering Centrifuge Repair
Services
ADDENDA
Prospective bidders are responsible for reviewing any
published addenda regarding this bid at
ebmud.com/business-center
CONTACT
Jose Duarte, Plant Mechanical Maintenance Supervisor
(510) 287-1895
jose.duarte@ebmud.com
RESPONSE DUE
August 13, 2026
12:00 p.m. PST
SUBMIT ELECTRONICALLY TO*
Jose Duarte, Plant Mechanical Maintenance Supervisor
jose.duarte@ebmud.com
*Hardcopy proposals will not be accepted
375 ELEVENTH STREET . OAKLAND . CA 94607-4240 . WWW.EBMUD.COM/BUSINESS-CENTER/

EAST BAY MUNICIPAL UTILITY DISTRICT
RFP for Dewatering Centrifuge Repair Service
TABLE OF CONTENTS
I. STATEMENT OF WORK
A. SCOPE
B. PROPOSER QUALIFICATIONS
C. SPECIFIC REQUIREMENTS
D. DELIVERABLES / REPORTS
II. CALENDAR OF EVENTS
A. VOLUNTARY SITE WALK
III. DISTRICT PROCEDURES, TERMS, AND CONDITIONS
A. RFP ACCEPTANCE AND AWARD
B. EVALUATION CRITERIA/SELECTION COMMITTEE
C. PRICING
D. NOTICE OF INTENT TO AWARD AND PROTESTS
E. WARRANTY
F. INVOICING
G. BONDS
IV. RFP RESPONSE SUBMITTAL INSTRUCTIONS AND INFORMATION
A. DISTRICT CONTACTS
B. SUBMITTAL OF RFP RESPONSE
C. RESPONSE FORMAT
ATTACHMENTS
EXHIBIT A - RFP RESPONSE PACKET
EXHIBIT B - INSURANCE REQUIREMENTS
EXHIBIT C - GENERAL REQUIREMENTS
EXHIBIT D - IRAN CONTRACTING ACT CERTIFICATION
EXHIBIT E - BOND FORMS
EXHIBIT F - INFORMATION TECHNOLOGY SECURITY INFORMATION TO BE EXCLUDED FROM
PUBLIC RECORDS ACT REQUESTS
REV 5/13/26

Dewatering Centrifuge Repair Services
I. STATEMENT OF WORK
A. SCOPE
It is the intent of these specifications, terms, and conditions to describe the overhaul,
responsive repair and upgrade services, and accurate troubleshooting services for
dewatering centrifuges at the Main Wastewater Treatment Plant (MWWTP).
East Bay Municipal Utility District (District) intends to award a three-year contract with
two options to renew for one-year terms to the Proposer(s) who best meets the
District's requirements.
Low speed Specifications (Refer to Item I.C.-1.1 below) pertains to three 180 gallons per
minute (GPM) Humboldt S-4 dewatering centrifuges and Viscotherm AG back drive
components in service since the 1980s.
High speed Specifications (Refer to Item I.C.-1.2 below) pertains to two 350 GPM
Flottweg Z-73-4/454 centrifuges with Simp drive.
B. PROPOSER QUALIFICATIONS
Prospective vendors can submit a proposal for all aspects of Low speed and High speed
or all aspects of either Low speed or High speed.
1. Proposer Minimum Qualifications
a. Proposer, Proposer's principal, or Proposer's staff shall have been
regularly engaged in the business of providing dewatering centrifuge
repair and upgrade services for at least ten (10) years.
b. Proposer shall possess all permits, licenses, and professional credentials
necessary to perform services as specified under this RFP.
C. SPECIFIC REQUIREMENTS
Low Speed Centrifuge Units
1.1 SCOPE OF WORK FOR INSPECTION, REPAIR AND OVERHAUL OF THREE 180 GPM
HUMBOLDT S-4 DEWATERING CENTRIFUGES AND VISCOTHERM AG BACK DRIVE
COMPONENTS
1.1.A. General
The District anticipates that there may be as many as three (3) major overhauls required
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Dewatering Centrifuge Repair Services
annually. If additional shop repairs are required beyond the scope of the major
overhauls, they will be paid for on an hourly basis, plus the cost of any materials.
The maximum time allowed for a major overhaul is thirty-five (35) calendar days
(including transit time).
1.1.B. Scope of Work-Major Overhaul
Transport rotating assembly to and from the MWWTP, disassemble, remove and
dispose of solids from rotating assembly, thoroughly steam clean bowl and conveyor,
inspect, repair as detailed below, balance, reassemble, return transport to site.
Contractor will provide the replacement parts at District cost.
Repairs and modifications to be carried out:
1. Remove solids, cake and all materials from centrifuge rotating assembly.
2. Dispose of the solids.
3. Thoroughly steam clean conveyor, especially the feed compartment, bowl
return tubes and head walls.
4. Replace, with new, both main bearings.
5. Submit a post-inspection report (include photo or video) for District repair
authorization.
6. Replace, with new, both conveyor trunnion bushes.
7. Replace, with new, thrust bearing.
8. Repair conveyor feed zone damage by weld-build, extension ring replacement
(in lieu of original tiles), or replacement tiles, to match adjacent.
9. Repair and correct faces and fits on conveyor.
10. Clean and sandblast conveyor flights.
11. Replace 280 ceramic conveyor tiles, if present, with stainless steel extension
plate.
12. Replace all six (6) conveyor bush seals.
13. Recoat conveyor with suitable protective coating.
14. Recoat bowl with suitable protective coating.
15. Grit blast both conveyor trunnion flanges.
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Dewatering Centrifuge Repair Services
16. Recoat centrifuge, conveyor and trunnion flanges with suitable protective
coating.
17. Balance centrifuge conveyor (prohibit balancing weights in seal area).
18. Balance centrifuge bowl (prohibit balancing weights in seal and baffle area).
19. Balance shall be within Original Equipment Manufacturer (OEM) specifications
using a soft bearing balancing stand.
20. Reassemble rotating assembly.
21. Vibration readings on bearing housings and elsewhere on the machine shall not
exceed 0.5 mils displacement at operating speed (1400 revolutions per minute
[RPM]).
22. Velocity shall not exceed 0.4 inches per second overall using a 600-60,000 CPM
Hanning Window.
23. Acceleration shall not exceed 2.0 G's overall using a 6,000-300,000 Hanning
Window.
24. Initial start-up should be done with the bowl CLEAN and EMPTY.
1.1.C. Scope of Work-Additional Shop Repairs
Provide additional service, repairs and/or troubleshooting at the shop for work above
and beyond the scope covered in Items 1.1.B. Additional work is to be on an as-
requested basis. If parts or materials are required, the District, at its option, will provide
parts and materials from District stock or authorize the Contractor to procure from
other sources. In the latter case, the District will reimburse the Contractor for the cost of
any parts or materials used.
High Speed Centrifuge Units
1.2 SCOPE OF WORK FOR INSPECTION, REPAIR AND OVERHAUL OF TWO 350 GPM
FLOTTWEG Z-73-4/454 DEWATERING CENTRIFUGES WITH SIMP DRIVE
1.2.A. General
The District anticipates up to two (2) annual major overhauls annually.
The maximum time allowed for a major overhaul is thirty-five (35) calendar days
(including transit time).
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Dewatering Centrifuge Repair Services
1.2.B. Scope of Work-Annual Major Overhaul (8,000 run-time hours)
Transport rotating assembly from the MWWTP, disassemble, remove and dispose of
solids from rotating assembly, thoroughly steam clean bowl and conveyor, inspection,
repair as detailed below, balance, reassemble, return completed assembly to the
MWWTP. Contractor shall be present for the start-up of the repaired unit. Contractor
will provide the replacement parts if the District does not have available.
Required Service:
1. Thoroughly steam-clean dismantled scroll and bowl assemblies.
2. Submit a detailed post-inspection report (include photos or video) for District
repair authorization.
3. Install new bearings and seals, SKF or equal.
4. Install new rotor bearings and lamellar rings, SKF or equal.
5. Inspect labyrinth rings, sealing disk, flanges and bearing journals for proper fit.
6. Inspect all anti-wear bushings and scrapers for wear and damage. Replace as
needed.
7. Replace worn or broken scroll tiles or scroll rings to match existing.
8. Replace all o-rings.
9. Re-assemble assembly to original specifications (torque values, sealants,
lubrication and alignment).
10. Bring ALL machined surfaces and dimensions to original specifications.
11. Inspect and restore all bearing fits to original specifications.
12. Vibration of bearing housing and machine shall not exceed 8 millimeters per
second at 2,600 RPM operating speed. Test run equipment for vibration
measurements prior to returning to District, and provide report of vibration
readings. Vibration readings should be done with the bowl clean and empty.
13. Balance scroll and bowl separately within 5 grams at 750 RPM using a soft
bearing balancing stand.
1.2.C. Scope of Work-Additional Shop Repairs
Provide additional service, repairs and/or troubleshooting at the shop for work above
and beyond the scope covered in Items 1.2.B. Additional work is to be on an as-
requested basis. If parts or materials are required, the District, at its option, will provide
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Dewatering Centrifuge Repair Services
parts and materials from District stock or authorize the Contractor to procure from
other sources. In the latter case, the District will reimburse the Contractor for the cost of
any parts or materials used.
D. DELIVERABLES / REPORTS
1. Submit post-inspection report (include photo or video) for District authorization
of repair or overhaul.
II. CALENDAR OF EVENTS
EVENT DATE/LOCATION
RFP Issued July 9, 2026
Wednesday, July 29, 2026, at: MWWTP
VOLUNTARY Site 10:00 AM - 12:00 Noon Lab Library
Walk/Proposal 2020 Wake Avenue
Conference Oakland, CA 94607
Response Due August 13, 2026 by 12:00 p.m.
Anticipated Contract December 2026
Start Date
Note: All dates are subject to change by District.
Proposers are responsible for reviewing https://www.ebmud.com/business-
center/requests-proposal-rfps/ for any published addenda. Hard copies of addenda
will not be mailed out.
A. VOLUNTARY SITE WALK/ PROPOSAL CONFERENCE
Mandatory site walk/Proposal conference will be held to:
1. Allow the District to discuss the scope of the project.
2. Provide Proposers an opportunity to view a site, receive documents, etc.
necessary to respond to this RFP.
3. Provide an opportunity for Proposers to ask specific questions about the project
and request RFP clarifications.
4. Provide the District with an opportunity to receive feedback regarding the project
and RFP.
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Dewatering Centrifuge Repair Services
All questions deemed to be pertinent by the District will be addressed in Addenda
following the site walk/Proposal conference.
III. DISTRICT PROCEDURES, TERMS, AND CONDITIONS
A. RFP ACCEPTANCE AND AWARD
1. RFP responses will be evaluated by the Selection Committee and will be scored
and ranked in accordance with the RFP section entitled "Evaluation
Criteria/Selection Committee."
2. The Selection Committee will recommend award to the Proposer who, in its
opinion, has submitted the RFP response that best serves the overall interests of
the District. Award may not necessarily be made to the Proposer with the lowest
overall cost.
3. The District reserves the right to award to a single or to multiple General or
Professional Service Providers, dependent upon what is in the best interest of the
District.
4. The District has the right to decline to award this contract or any part of it for any
reason.
5. Any specifications, terms, or conditions issued by the District, or those included in
the Proposer's submission, in relation to this RFP, may be incorporated into any
purchase order or contract that may be awarded as a result of this RFP.
6. Award of contract. The District reserves the right to reject any or all proposals, to
accept one part of a proposal and reject the other, unless the proposer stipulates
to the contrary, and to waive minor technical defects and administrative errors,
as the interest of the District may require. Award will be made, or proposals
rejected by the District as soon as possible after proposals have been opened.
B. EVALUATION CRITERIA/SELECTION COMMITTEE
All proposals will be evaluated by a Selection Committee. The Selection Committee may
be composed of District staff and other parties that have expertise or experience in this
type of procurement. The Selection Committee will select a Proposer in accordance with
the evaluation criteria set forth in this RFP. The evaluation of the RFP responses shall be
within the sole judgment and discretion of the Selection Committee.
The Selection Committee will evaluate each RFP response meeting the qualification
requirements set forth in this RFP. Proposer should bear in mind that any RFP response
that is unrealistic in terms of the technical or schedule commitments, or unrealistically
high or low in cost, will be deemed reflective of an inherent lack of technical
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Dewatering Centrifuge Repair Services
competence or indicative of a failure to comprehend the complexity and risk of the
District's requirements as set forth in this RFP.
RFP responses will be evaluated and scored according to the Evaluation Criteria below
and scored according to a zero to five-point scale. The scores for all Evaluation Criteria
will then be added to arrive at a weighted score for each RFP response. An RFP response
with a high weighted total will be ranked higher than one with a lesser-weighted total.
The Evaluation Criteria are as follows:
Evaluation Criteria
A. Technical Criteria (40 points total):
An evaluation will be made of the probability of success of proposed repair
work and risks associated with the RFP response.
B. C ost (20 points total):
The points for Cost will be computed by dividing the amount of the lowest
responsive RFP response received by each Proposer's total proposed cost.
While not reflected in the Cost evaluation points, an evaluation may also be
made of:
1. Reasonableness (i.e., does the proposed pricing accurately reflect the
Proposer's effort to meet requirements and objectives?);
2. Realism (i.e., is the proposed cost appropriate to the nature of the
products and services to be provided?); and
3. Affordability (i.e., the ability of the District to finance this project).
Consideration of price in terms of overall affordability may be controlling in
circumstances where two or more RFP responses are otherwise judged to
be equal, or when a superior RFP response is at a price that the District
cannot afford.
C. Im plementation Plan and Schedule (10 points total):
An evaluation will be made of the likelihood that the Proposer's repair plan
and schedule will meet the District's schedule.
1. The maximum time allowed for a major repair is 35 calendar days
(including transit).
2. The maximum time allowed for a minor repair is 21 calendar days
(including transit).
Additional credit will be given for the identification and planning for
mitigation of schedule risks which the Proposer believes may adversely
affect any portion of the District's schedule.
D. R elevant Experience (10 points total):
RFP responses will be evaluated against the RFP specifications and the
questions below:
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Dewatering Centrifuge Repair Services
Evaluation Criteria
1. Do the individuals assigned to the project have experience on similar
projects?
- At least 10 years of experience on relevant work.
2. Are resumes complete and do they demonstrate backgrounds that
would be desirable for individuals engaged in the work the project
requires?
3. How extensive is the applicable education and experience of the
personnel designated to work on the project?
E. R eferences (See Exhibit A - RFP Response Packet) (5 points total):
Provide reference names, titles, and contact information for similar projects
performed by the contractor.
F. U nderstanding of the Project (5 points total):
RFP responses will be evaluated against the RFP specifications and the
questions below:
1. Has the Proposer demonstrated a thorough understanding of the
purpose and scope of the project?
2. How well has the Proposer identified pertinent issues and potential
problems related to the project?
3. Has the Proposer demonstrated that it understands the deliverables the
District expects it to provide?
Has the Proposer demonstrated that it understands the District's time
schedule and can meet it?
G. M ethodology (5 points total):
RFP responses will be evaluated against the RFP specifications and the
questions below:
1. Does the methodology depict a logical approach to fulfilling the
requirements of the RFP?
2. Does the methodology match and contribute to achieving the
objectives set out in the RFP?
3. Does the methodology interface with the District's time schedule?
H. C ontract Equity Program:
1. Proposer shall be eligible for SBE or DVBE preference points if they are a
certified small business entity, as described in the guidelines contained
in Exhibit A-Contract Equity Program, and they check the appropriate
box, requesting preference, in Exhibit A-Proposer Information and
Acceptance. Qualified DVBEs and/or SBEs will receive an additional 5
points to their total score.
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