01140.00 1022 Section 01140 - Potable Water Pipe and Fittings
Description
01140.00Scope - This Work consists of constructing potable water pipe and fittings 16 inches and
smaller in diameter within a public Right -of-Way or easement.
Materials
01140.10Materials - Furnish Materials meeting the following requirements:
Bolted, Sleeve- Type Couplings fo r Plain End Pipe ............................... 02475.60 Detectable Marking Tape and Wire ....................................................... 02470.60 Ductile Iron Pipe Fittings ....................................................................... 02475.20 Ductile Iron Pipe .................................................................................... 02470.20 Polyethylene Encasement ..................................................................... 02470.50 Polyvinyl Chloride (PVC) Pipe fittings - 4" and larger ............................ 02475.40 Polyvinyl Chloride (PVC) Pipe fittings - under 4" ................................... 02475.45 Polyvinyl Chloride (PVC) Pipe - 4" and larger ....................................... 02470.40 Polyvinyl Chloride (PVC) Pipe - under 4" .............................................. 02470.45 Restrained Joints .................................................................................. 02475.50 High Density Polyethylene Pipe ............................................................ 02470.31 High Density Polyethylene Pipe Fittings ................................................ 02475.31 High Density Polyethylene (HDPE) pipe shall meet the requirements of ANSI/AWWA C906, Standard PE Code Designation PE 3408, minimum cell classification PE 334434C ( ASTM D3350). Pipe may also be PE 4710 according to the pending revisions to ANSI/AWWA C906- 07. Pipe shall be iron pipe size (IPS) outside diameter or ductile iron pipe size (DIPS) outside diameter. All HDPE pipe and fittings shall be of the dimension ratio (D R) as shown.
01140.11Handling Pipe and Fittings - Handle pipe and fittings to prevent damage to or
contamination of the pipe, fitting, lining, or coating. Load and unload pipe and fittings using hoists and slings so as to avoid shock or damage, and under no circumstances allow them to be dropped, skidded, or rolled against other pipe or fittings. If any part of the coating or lining is damaged, repair in a manner satisfactory to the Engineer. Damaged or contaminated pipe and fittings will be rejected. Immediately separate all damaged or contaminated pipe and fittings and remove from the Project Site .
If pipe requires temporary storage, store on cradles to prevent entry of dirt, other foreign material, or contamination. Keep the pipe or pipe joint f ree of dirt, other foreign material, or contamination during handling or laying operations. Remove, clean, and relay any pipe or fitting that has been installed with dirt, foreign material, or contamination in it. When pipe laying is not in progress, close the open ends of pipe with watertight plugs or by other approved means to ensure cleanliness.
01140.12Cutting Pipe :
the proper spacing of valves, tees , or special fittings.
ends with the longitudinal axis of the pipe. Ream and smooth the interior edge and bevel the exterior edge of the cut ends. Flame cutting of ductile iron pipe is not allowed.
01140.41 1023 Construction
01140.40Trench Work - Excavate trench, prepare bedding, install pipe zone M aterial, backfill, and
dispose of excavated material according to Section 00405 and the following:
operations and maintain the trench until the ends of the pipe are sealed and provision is made to prevent floating of the pipe. Do not allow trench water or other deleterious materials to enter the pipe at any time.
considered flexible pipes. Use bedding and pipe zone Material for flexible pipes as described in 00405.12 and 00405.13.
between excavating potholes and pipe installation to change alignment and grade of the pipeline to avoid conflicts. Obtain approval from the Engineer before using fittings to avoid conflicts.
01140.41Laying Pipe :
recommendations.
joints. Use standard fittings and standard pipe lengths , unless otherwise shown. If shorter pipe lengths are required, the maximum allowable pipe lengths will be shown. Do not exceed 80 percent of the manufacturer's recommendations for the amount of deflection at each pipe joint when pipe is laid on a horizontal or vertical curve. Where field conditions require deflection or curves not shown , the Engineer will determine the methods to be used.
alignment and then deflect it to the curved alignment. Widen trenches on curves for this purpose as allowed or directed .
encasement. Install polyethylene encasement according to AWWA C105 and the manufacturer's recommendations.
manufacturer's recommendations.
Lay horizontal and vertical curves in pipe, as shown, with standard pipe by deflecting the joints. Use standard fittings and standard pipe lengths unless otherwise shown. If shorter lengths of pipe are required, the maximum allowabl e pipe lengths will be shown. Do not exceed 80 percent of the manufacturer’s recommendations for the amount of deflection at each pipe joint when pipe is laid on a horizontal or vertical curve. Where field conditions require deflection or curves not show n, the Engineer will determine the methods to be used. Do not bend PVC pipe segments.
horizontal and vertical separation between water and sanitary sewer facilities for ins tallation of new water lines and appurtenances. Submit all proposals for variance in writing. T he proposal shall include the reason for the variance, type of material and condition of the sewer line, and location of the water and sewer facilities, including horizontal and vertical skin-to -skin clearances Proposals 01140.42 1024 will be reviewed by the Engineer and approved, approved as noted, or returned for correction . Each variance will be addressed on a case- by-case basis.
other utilities. Maintain a minimum horizontal clearance of 24 inches between installed pipe and other utilities. The Engineer's approval and additional protection are required for any pipe installation that does not maintain the specified minimum clearances.
01140.42Jointing Pipe :
oil, grit, or other foreign matter from the joint. Keep the joint from contacting the ground. When assembling gasketed joints, apply an approved lubricant as specified by the pipe manufacturer. For pipe not furnished with a depth mark, m ark pipe with a depth mark before joint assembly.
to ASTM D3261. HDPE fittings shall be of the same class as the HDPE piping.
manufactured fittings, as approved.
01140.43Polyethylene Encasement :
by the Specifications. Wrap polyethylene encasement loosely around the pipe, fittings, and couplings, and secure with 2 inch wide polyethylene adhesive tape. Cover joints or seams in the polyethylene encasement using 2 inch wide polyethylene adhesive tape. The polyethylene encasement is not required to be watertight, but do not expose any part of the pipe, fittings, or coupling to the backfill. Exercise care during backfilling to prevent puncturing or otherwise damaging the polyethylene encasement.
encasement within 1 foot of the connection couplings or fittings. After the connections are made, overlap the exiting polyethylene encasement a minimum of 3 feet and seal the overlaps with 2 inch wide polyethylene adhesive tape.
01140.44Thrust Restrain t:
and crosses. Pour concrete thrust blocks in place against solid, undisturbed earth at the sides and bottom of the trench excavation. Shape the blocks so as not to obstruct access to the joints of the pipe or fittings.
tees dead ends, crosses, and all pipe joints within the indicated or specified distance on eac h side of the bends, tees, dead ends, and crosses. Install joint restraint systems according to the manufacturer's recommendations.
01140.45Marking Tape and Wire :
connections. Place a continuous solid copper wire along the top of all water pipe, including service 01140.47 1025 lines. Use cable ties to s ecure the copper wire to the top of the pi pe at a maximum spacing of 10 feet. Tie all splices and make them electrically continuous and waterproof. Provide access to terminal ends of the wire at all valve boxes, meter boxes, hydrants, and vaults. The result of this installation shall be a conti nuous wire circuit electrically isolated from ground. Place the marking tape approximately 1 foot above the top of the pipe for its full length.
outside th e foundation of buildings where the pipe enters the building. Provide wire access at locations no more than 1,000 feet apart.
completed on the test section. Perform intermediate testing after backfilling operations and prior to surface restoration Work . Test continuity between access locations by use of a temporary wire connecting test points in -line with an ohmmeter. Measure resistance with an approved ohmmeter that has been properly calibrated. The continuity of a test section will be accepted if the resistance of the test section does not e xceed 5 ohms for each 500 feet of location wire being tested. Measure isolation from ground with an approved 1000 volt Megger, applied for 1 minute. The isolation of a test section will be accepted if the isolation resistance of the test section is at le ast 10 megohms. Locate and repair all breaks or defects in the wire and re-test until specified results are obtained.
01140.46Blowoff Assemblies - Construct blowoff assemblies as shown and at the locations shown
01140.47Connections to Existing Mai ns - Make necessary arrangements with the Engineer a
minimum of 7 Calendar Days before making connections to existing water mains. Assemble all Materials, Equipment , and labor necessary to properly complete the Work before starting.
provide written notices to the residents affected by the shutoff a minimum of 72 hours before the shutoff . Submit a draft written notification to the Engineer for approval 5 Calendar Days before providing written notice to the affected residents. The Engineer will advise which property owners are to be notified.
other than normal working hours. Do not operate any valves on the existing system without specific permission of the Engineer.
before constructing the connection. If existing pipi ng is different than shown, provide measurements of depth and a detailed sketch of existing piping configuration and alignment to the Engineer not less than 2 weeks before the expected construction.
interruption, and as rapidly as possible until completed. Schedule main shutoffs to ensure that mains do not remain shut off overnight, on Fridays, over weekends, or on holidays.
of pipe to provide for the installation of the required fittings at the points of connection. Determine the exact length of the existing water main that is to be removed. Bevel pipe ends to prev ent damage to the transition coupling gasket during installation of the coupling. Clean the exterior of the existing pipe end to a sound, smooth finish before installation of the coupling.
01140.48 1026 01140.48 Maintaining Service :
and coordinate the Work with that of the Utility so that service will be resumed with the least possible inconvenience to the public.
locations as the Utility may elect to supply customers with water, after the affected section of pipe has passed hydrostatic and bacteriological tests. The installation of any such connections by the Utility shall not be construed as an acceptance by the Agency of any part of the Work required under the Contract.
01140.49Backfilling - After the pipe is installed and inspected, backfill the trench according to
Field Testing
01140.50Filling and Flushing - Fill pipes slowly with potable water at a maximum velocity of 1 foot
per second while venting all air. Take all required precautions to prevent entrapping air in the pipes.
contaminated material that may have become lodged in the pipe. Flushing velocity shall be a minimum of 3 feet per second. If no hydrant is installed at the end of the main, provide a tap large enough to develop a velocity of at least 3 feet per second in the main. Perform flushing and disinfection according to AWWA C651-14 .
life, de -chlorinate the treated waste water according to AWWA C655 before disposing of water into any storm drain or natural drainage channel. Dispose of disinfecting solution according to AWWA C655 and to the satisfaction of the Engineer and local authorities. If approved by the Engineer and the sanitary sewer Utility, disposal may be made to an available sanitary sewer , provided the rate of disposal will not overload the sewer.
01140.51Hydrostatic Testing :
hydrostatic pressure equal to one and one-half times the working pressure, but at least 150 psi, measured at the highest point of the test section. Furnish and operate all pumps, gauges, plugs, saddles, corporation stops, miscellaneous hose and piping, and measuring Equipment necessary for performing the test. Provide certifications of accuracy for gauges used in the test from an approved laboratory.
Place all thrust blocks and allow time for the concrete to cure before testing. Where permanent blocking is not required, furnish and install temporary blocking and remove it af ter testing.
of time to allow the escape of air and to allow the lining of the pipe to absorb water. The Agency will furnish the water necessary to fill t he pipelines for testing, at a time of day when sufficient quantities of water are available for normal system operation.
Provide additional pumping during the test period to continuously maintain pressure within 5 psi 01140.51 1027 of that required. During the test, observe the section being tested to detect any visible leakage. Use a clean container to hold water for pumping up pressure on the main being tested. Sterilize this makeup water by adding chlorine to a concentration of 25 ppm.
restore the required pressure at the end of the test period by pumping through an approved positive displacement water meter.
gallons per hour determined by the formula:
L =
Where:
L = allowable leakage in gallons per hour S = lengt h of pipeline tested in feet D = nominal diameter of the pipe in inches P = average test pressure during the leakage test in psi
period.
If the actual leakage exceeds the allowable amount, locate and repair the leaks and retest the pipeline.
pressure against the hydrant valve. After the pipe test has been completed, test each gate valve in turn by closing it and relieving the pressure beyond. This test of the gate valve will be acceptable if there is no immediate loss of pressure on the gauge when the pressure beyond the valve is relieved. Verify that the pressure differential across the valve does not exceed the rated working pressure of the valve.
are approved. The Engineer may require that the first installed section of pipe installed by each crew, not less than 1,000 feet in length, be tested. Do not continue pipe laying more than an additional 1,000 feet unt il the first section has been tested successfully.
set up all Equipment completely ready for operation and successfully perform the test to ensure that the pi pe is in a satisfactory condition.
discovered during hydrostatic field testing. Whenever it is necessary to replace defective material or correct the workmanship, repea t the hydrostatic test until a satisfactory test is obtained.
the distance from the existing pipe to the new valve is 18 feet or less, no hydrostatic test will be required if the section of new pipe between the new valve and the end of the existing main is installed with pretested, prechlorinated pipe. When the required hydrostatic tests are conducted SD(P)½ 148,000 01140.51 1028 in the new main section beyond the installed new valve in the closed position, the normal pressure of the existing main may be present against the other side of the new valve.
extensi on and the new valve is more than 18 feet, do not connect the new pipe to the existing pipe until after hydrostatic tests have been made to the required pressure in both directions against the new valve. Test after installing a temporary cap or plug on th e end of the new pipe, beyond the new valve, as close as possible to the existing pipe. Make the final connection to the existing main with pretested, prechlorinated pipe.
main pipe to be tested, conduct three separate tests as shown in the following table:
Water Main Gate Valves Hydrant Auxiliary Gate Valves Hydrant Operating Stem Valves Hose Ports Test No. 1 Closed Closed Wide Open Wide Open Test No. 2 Closed Wide Open Closed Wide Open Test No. 3 1 − Closed Wide Open Closed
1 Test each hydrant to the required test pressure. When testing a hydrant singly, pressure in the supply main beyond the hydrant auxiliary gate valve shall be 25 psi.
existing mains, install the hydrant connection, including hydrant tee, connection pipe and auxiliary gate valves, with pretested Materials.
Before the hydrant connection is made to the existing main, subject the hydrant installation to hydrostatic Test No. 3 in 01140.51(c).
hydrostatic tests on all HDPE pipe:
installation, conduct an above grade test. Before beginning the test, fill the pipeline with water, pressurize to the test pressure according to 01140.51(a), and allow to stand without makeup pressure until the pressure reaches equilibrium. Equilibrium will usually occur within 2 to 4 hours.
After equilibrium has been reached, test the pipe according to 01140.51(a). Visually inspect the pipe for leaks during t he test. Repair all leaks before installing the pipe in the trench or pulling the pipeline into the borehole. Repair leaks at fusion joints by cutting out the leaking fusion joint, re-fusing the joint, and conducting a new above grade test. Successful c ompletion of the above grade test requires approval from the Engineer. Do not place the pipe in the trench or pull the pipe into place before successfully completing the above grade test.
place. Before beginning the test, fill the pipeline with water, pressurize to the test pressure according to 01140.51(a), and allowed to stand without makeup pressure until the pressure reaches equilibrium. Equilibrium w ill usually occur within 2 to 4 hours.
01140.52 1029 01140.52 Disinfecting :
repaired portions of, or extensions to, existing mains accordin g to AWWA C651 -14 and obtain a satisfactory bacteriological report.
The initial chlorine content of the water shall be not less than 25 ppm. A chlorine residual of not less than 10 ppm shall remain in the water after standing 24 hours in the pipe.
(65 - 70 percent Cl). First mix the dry powder as a paste and then thin to a 1 percent chlorine solution by adding water to give a total quantity of 7.5 gallons per pound (water to dry powder).
in the form of liquid household bleach (5 - 6 percent Cl ). This liquid chlorine compound may be used full strength or diluted with water.
or any valved section of it, through a corporation stop inserted in the horizontal axis of the pipe. Supply the water injector for delivering the chlorine-bearing water into the pipe from a tap on the pressure side of the gate valve controlling the flow into the pipeline extension. Alternate points of applications may be use d when approved.
supply, to flow very slowly into the newly laid pipeline during application of the chlorine. The rate of chlorine application shall be in such proportion to the rate of water entering the newly laid pipe that the initial chlorine content of the water will be at least 25 ppm.
and non-disinfected pipe lines constructed under this Contract, unless a State Health Division approved backflow preventer is installed in the connecting line.
residual chlorine at pipe extremities and at other representative points shall be at least 10 ppm.
specified in AWWA C651 -14. Liberally treat the exterior of the existing main at the connection point with hypochlorites. Swab or spray the interior of all new closure fittings , valves, and pipe required for the connection with a 1 percent hypochlorite solution. Disinfect the 5 feet of existing main adjacent to the connection point with a 100 ppm chlorine solution and then thoroughly flush the line.
newly laid pipe until the replacement water throughout its length is visually clear and shows, upon test, an absence of chlorine or a residual no greater than that normally found in the source of supply.
sampling.
1200 feet along the pipe and one set at the end of the pipe. If water from the trench enters the pipe or, in the opinion of the Engineer, excessive quantities of dirt or debris have entered the 01140.60 1030 new main, increase sampling frequency to collect a sample set every 200 feet along the pipe, in addition to the sample set required at the pipe end.
received from t he local or State health department on samples collected from representative points in the new system. Samples will be collected and bacteriological tests obtained by the Engineer.
of less than 10 ppm at the end of the retention period or an unsatisfactory bacteriological test, repeat the original chlorination procedure until satisfactory results are obtained.
01140.60Surface Restoration - Restore trench surfaces according to Section 00495
Measurement
01140.80Measurement - The quantities of potable water pipe and fittings will be determined as
follows:
backfill classes will be measured on the length basis and will be horizontal measurement along the top of the finished trench, with no deduction for fittings, valves, and couplings.
For PVC fittings 4 inches or greater, i n addition to measurement of the pipe, an allowance of 12 pipe diameters will be made for each factory -fabricated bend, sleeve, reducer or coupling, and an allowance of 18 pipe diameters of the larger diameter pipe will be made for each factory -fabricated tee or cross. The allowance will be added to the quantity for pipe of the same diameter.
Ductile iron pipe fittings will be measured on the unit basis.
will be measured on the volume basis for each backfill class. The backfill classes are defined in Section 00405. When the pipeline grade is lowered in excess of 12 inches below the grade shown, or when pipeline horizontal alignment is changed by more than 12 inches after the original trench has been excavated, all additional excavation and backfill, outside the limits of the original trench, that is required to construct the change will be classified as extra trench excavation. The depth will be the actual depth removed f or the changed line or grade as directed. The width will be the actual width removed for the changed line or grade, but in no case will the measured width exceed the allowable widths specified in 00405.41(c).
measured on the unit basis.
Trench resurfacing will be measured according to 00495.80.
Installation under Pavement by tunneling, jacking, or boring methods will be measured according to 00406.80.
01140.90 1031 Payment
01140.90Payment - The accepted quantities of Work performed under this Section will be paid for
at the Contract unit price, per unit of measurement, for the following items: Pay Item Unit of Measurement
with Class ___ _ Backfill ........................................................................ Foot
with Restrained Joints and Class ____ Backfill ..................................... Foot
Joints and Class ____ Backfill .............................................................. Foot
The Contract unit price for the appropriate Pay Items reflects plan requirements or the Contractor's choice from the applicable options listed on the Pipe Data Sheets if shown.
In items (a) and (b), the nominal diameter of pipe, fittings and couplings will be inserted in t he first blank. The class of backfill will be inserted in the second blank. The quantities include the pipe plus the allowance for the fittings and couplings. In item (c), the class of backfill will be inserted in the blank. In item (d), the nominal di ameter of assembly will be inserted in the blank.
In item (e) the nominal diameter of pipe will be inserted in the first blank and the nominal diameter of the main line will be inserted in the second blank. In item(s) (f) and (g), the nominal diameter of pipe will be inserted in the first blank. The class of backfill will be inserted in the second blank.
In item(s) (h), (i), (j), (k), (l), (m), and (n), the nominal diameter of the fittings or couplings will be inserted in the blank.
Payment will be payment in full for furnishing and placing all Materials, and for furnishing all Equipment , labor, and Incidentals necessary to complete the Work as specified.
Trench resurfacing will be paid for according to 00495.90.
Installation under Pavement by tunneling, jacking or boring methods will be paid for according to 00406.90.
01140.90 1032 No separate or additional payment will be made for:
• trench excavation • bedding • pipe zone material • backfill Work • polyethylene encasement • concrete thrust blocks • detectable marking tape and wire • flushing, hydrostatic testing and disinfection, and water for testing • exposing and cleaning existing mains, cutting and removing existing pipe, draining existing mains, disinfecting existing mains, and refilling existing mains PVC fittings under 4 inch HDPE fittings pipe reconnections