TECHNICAL SPECIFICATION
A. Scope of Work
The Contractor shall furnish and install new rubber expansion joints, and any necessary ancillary parts needed to complete the rubber expansion joint assembly, i.e. retaining rings and/or mating flanges for the digester gas pipeline at the City of Stockton Regional Wastewater Control Facility (RWCF). Contractor shall also replace all steel bolts in kind.
B. Submittals
1. Contractor shall submit information in accordance with Section 01300, Submittals.
2. The contractor shall submit the following information:
a. Product and Manufacturer’s Data – Manufacturer’s catalog cut with highlighting to shown compliance with specified features.
b. Clearly mark submittal information to show specific items, materials, and accessories or options being furnished.
c. Submit certification by manufacturer that the materials and equipment selected are suitable for methane gas applications and are UV resistant.
C. Materials
1. Digester Gas Service Expansion Joints :
a. Expansion joints shall be suitable for 150 psi maximum operating pressure, with tap flanges to ANSI standards for indicated pressure rating. b. Expansion joint carcass or body shall be of synthetic elastomer chlorobutyl, for the tube and cover, and synthetic fabric reinforcement suitable for the intended service. c. Expansion joints shall be UV resistant and methane resistant. d. Furnish retaining rings and control unit assemblies with all non-metallic expansion joints.
e. Design molded expansion joints to provide the following minimum movements:
Elon
gation: 1 inch
Compression: 2 inches
Lateral: 1 inch
Angular: 4 degrees
f. Expansion joints shall be manufactured by Proco Series 240, General Rubber Style 1101, or approved equal.
g. Gaskets shall be Victaulic, Vic-Flange style, Grade T (Nitrile), or approved equal
2. Bolts:
a. ASTM A276
i. Tensile Strength: 75,000 psi minimum
ii. Yield Strength: 30,000 psi minimum
iii. Elongation: 35 percent maximum
iv. Reduction of area: 45 percent maximum
EXHIBIT 3
BID SET UW21013
CITY OF STOCKTON
DEPARTMENT OF MUNICIPAL UTILITIES
RWCF DIGESTER GAS PIPELINE
EXPANSION JOINTS REPLACEMENT
JUNE 2022
TECHNICAL SPECIFICATION
Figure 1. As-built Detail – Molded Expansion Joint, See Appendix A, Sheet M-0.1
Table 1. Molded Expansion Joint Notes, Match Figure 1 above.
Figure 2. Welded Pipe-Flange Connection Figure 3. Non-Welded Pipe-Flange Connection
D. Expansion Joint Replacement
1. The Contractor shall coordinate with the City Representative two weeks prior to the start of Size
I.D.
(inch)
Number of
Expansion
Joints to be
Replaced
“A”
(inch)
“B”
O.D.
(inch)
Bolt
Circle
(inch)
Number of
Bolt Holes
Bolt
Hole
Size
(inch)
Connection Type
10 2 8 16 14-1/4 12 1 Non-Welded Flange
16 4 8 23-1/2 21-1/4 16 1-1/8 Non-Welded Flange
20 10 8 17-1/2 25 20 1-1/4 Welded Flange
EXHIBIT 3
BID SET UW21013
CITY OF STOCKTON
DEPARTMENT OF MUNICIPAL UTILITIES
RWCF DIGESTER GAS PIPELINE
EXPANSION JOINTS REPLACEMENT
JUNE 2022
TECHNICAL SPECIFICATION
expansion joint replacement. The Contractor shall only have two (2) working days to complete the expansion joint replacement portion of the work, see Section F.
2. All other work part of this contract: mobilization, preparation and take down of construction facilities/access equipment is not limited by the 2-day constraint.
3. All non-welded flanges are gasketed at the flange connection to the steel pipe. Contractor shall replace all rubber gasket seals in-kind.
4. It is not known if the digester gas pipeline contains sediment. Any sediment encountered during the removal of the existing joints from the pipeline can be disposed of onsite at no additional cost to the City. All other materials and equipment removed shall become the property of the Contractor.
5. Contractor shall install new steel bolts when reconnecting the new expansion joint assembly.
6. After the expansion joints are installed, the C ontractor shall inspect for leaks as the digester gas system is placed back on-line. The Contractor shall make all adjustments necessary to tighten up any areas detected to be leaking.
7. Non-sparking tools shall be utilized for the duration of this work.
E. Warranty
1. Warranty: All expansion joint replacements at the digester gas line, performed by the Contractor, shall be warranted against failure due to faulty workmanship and/or materials for a period of one (1) year after Final Completion of work.
Expansion joint failure is defined as cracking, embrittlement, or softening and failure to provide a leak proof seal. The Contractor shall remove and replace all failures at their expense. If any repair is necessary during the warranty period, a new one (1) year warranty period shall start at the date the system is placed back on-line.
F. Coordination
1. The RWCF is currently undergoing major construction activities throughout various areas of the plant, which is not a part of this contract. The existing construction project at the RWCF is anticipated to be continuing throughout the time of the expansion joint replacement. As such, the Contractor shall have to coordinate with the City Representative’s and existing construction team onsite prior to the start of work to limit any further disruptions or conflicts.
2. In order for the expansion joints to be replaced, the cogeneration system has to be shut down temporarily. The City can provide a 2 day maximum shutdown as a means to complete this work. The Contractor shall notify the City upon furnishing all equipment and materials needed for the expansion joint replacement. Upon notification, the City will assume the Contractor’s readiness to perform the work. The City’s Regional Wastewater Control Facility (RWCF) staff will then coordinate a system shutdown of the cogeneration system. Contractor shall anticipate beginning work approximately one week to two weeks following their notification and upon receiving a confirmed notice of the agreed-upon shut-down date, by the City.
3. The City shall coordinate with the Contractor and finalize a specific date for the system shut down.
EXHIBIT 3
BID SET UW21013
CITY OF STOCKTON
DEPARTMENT OF MUNICIPAL UTILITIES
RWCF DIGESTER GAS PIPELINE
EXPANSION JOINTS REPLACEMENT
JUNE 2022
TECHNICAL SPECIFICATION
4. The RWCF will shut-down the Cogeneration system for a maximum of two (2) working days.
Contractor shall have a total of two (2) working days to perform the installation of the expansion joints.
5. Shut-down shall only take place during a regul ar work week, Monday – Friday. Contractor can work continuously throughout that time in order to meet the two (2) calendar shut-down constraint.
EXHIBIT 3
SCALE: N.T.S.
DESIGNED BY: AC
DRAWN BY: AC
CHECKED BY: AG
DATE: JUNE 2022
16" EJ-1
GAS HOLDER
120" EJ-2I
20" EJ-1
I DIGESTER 41
PROJECT - SITE MAP
CITY OF STOCKTON
REGIONAL WASTEWATER CONTROL FACILITY
DIGESTER GAS PIPELINE EXPANSION JOINTS REPLACEMENT
EJ-6
20" EJ-7
AUXILIARY
COGENERATION
BUILDING
SHEET NO.
1 OF 13 SHEETS
PROJECT NO.
UW21013
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