steel pipe and fittings

7/31/2019 Steel Pipe and Fittings

1/18

Steel Pipe and Fittings

SECTION 02662

STEEL PIPE AND FITTINGS

PART 1 GENERAL

1.1 DESCRIPTION

A. This section covers the contract items 78 Inch Diameter Steel Pipe andFittings, and Furnish 78 Inch Diameter Steel Pipe.

B. The contract item 78 Inch Diameter Steel Pipe and Fittings includessteel pipe and fittings and the following:

1. Manholes.

2. Blowoff nozzles.

3. Butt strap closure rings.

4. Bell and spigot rings.

5. Passholes.

6. Rubber gaskets.

7. Cement mortar lining.

8. Field applied mortar to joints.

9. One temporary 78 inch test bulkhead.

10. Three permanent 78 inch test bulkheads.

11. Testing.

12. Coating.

C. The contract item Furnish 78 Inch Diameter Steel Pipe includesfabricating 78 inch diameter steel pipe and delivering the pipe to theDepartment for installations by others. The contract item also includes:

1. Cement mortar lining.

2. Testing.

3. Coating.

02662-1 R-04


2/18


1.2 RELATED SECTIONS

A. Supplementary General Conditions, General Conditions, Division 1sections, and Drawings apply to this section. This section may requiredirect correlation with the following sections of the contract:

1. Section 02667 Pipeline Appurtenances.

2. Section 02300 Earthwork.

3. Section 05000 Materials and Workmanship.

4. Section 09970 Coatings.

5. Section 09971 Cement Mortar Lining.

1.3 REFERENCES

A. The following publications form a part of this specification to the extentreferenced. Application of these publications shall conform toDocument 00702 Interpretation of the Contract, Paragraph 2:

1. American Society for Testing and Materials (ASTM):

a. ASTM A 20 Standard Specification for General Requirementsfor Steel Plates for Pressure Vessels.

b. ASTM A 370 Standard Test Methods and Definitions forMechanical Testing of Steel Products.

c. ASTM A 516 Standard Specification for Pressure VesselPlates, Carbon Steel for Moderate and Lower Temperature Service.

d. ASTM A 635 Standard Specification for Steel, Sheet andStrip, Heavy-Thickness Coils, Carbon, Hot-Rolled.

e. ASTM A 1018 Standard Specification for Steel, Sheet andStrip, Heavy Thickness Coils, Hot Rolled,

Carbon, Commercial, Drawing, Structural,High-Strength, Low-Alloy, with ImprovedFormulability.

f. ASTM D 395 Standard Test Method for Rubber Property Compression Set.

g. ASTM D 412 Standard Test Method for Vulcanized Rubberand Thermoplastic Elastomers Tension.

02662-2 R-04


3/18


h. ASTM D 471 Standard Test Method for Rubber Property Effect of Liquids.

i. ASTM D 1869 Standard Specification for Rubber Rings forAsbestos Cement Pipe.

j. ASTM D 2240 Standard Test Method for Rubber Property Durometer Hardness.

2. American Water Works Association (AWWA):

a. AWWA C200 Steelwater Pipe 6 In. (150mm) and Larger.

1.4 SUBMITTALS

A. Submit the following:

1. Quality control plan and procedures to ensure pipe sectionsconform to these specifications. The quality control plan shallinclude:

a. Details of tests and measurements during fabrication.

b. Recording and maintenance of data.

c. Reporting of negative findings and actions to be taken.

2. Pipeline layout drawings and installation procedures and details.Drawings shall include plan and profiles showing each pipe section

in place to a scale of 1 inch = 20 feet or larger.

3. Fabrication details and procedures for pipe sections, includingfitting and bell and spigot rings, and repair of bell and spigot rings.

4. Dimensional details of the belled pipe ends.

5. Repair procedures for belled pipe ends.

6. Fabrication and installation sequence for the steel pipe and fittings,including hydrostatic testing and nondestructive testing.

7. Working drawings and data for test bulkhead installation andprocedures, including pipe shell repair and pipe lining repair.

8. Plan for hydrostatic testing of installed pipeline.

9. Passhole locations.

10. Methods used to handle pipe sections.

02662-3 R-04


4/18


11. Method used to support and secure pipe sections duringtransportation.

12. Method used to support pipe and maintain tolerances during theplacement of concrete.

13. Mill certificates and test reports.

14. Dimensional details of the bell and spigot joint rings including thedimensions for the rings after cold expanding.

1.5 QUALITY ASSURANCE

A. Basis of Acceptance for Shipping:

1. The Engineer will verify the acceptability of the pipe during andafter manufacture to determine whether the pipe conforms to these

specifications, including materials, fabrication, freedom fromdefects, and the results of the physical test requirements asspecified herein. Inspection facilities, as approved, shall beprovided to permit inspection during and after manufacture. TheEngineer shall be given 48 workday hours advance notice thatfinished pipe sections are ready for inspection prior to shipment.The Engineer will inspect the pipe sections and will accept thosewhich have been manufactured in accordance with thesespecifications.

B. Quality Control:

1. Pipe fabrication shall not begin prior to receipt of the quality controlplan marked NO APPARENT DEFECTS.

2. If the results of production indicate that proper quality controlprocedures are not being maintained, as evidenced by manufactureof defective pipe sections, production shutdowns due to equipmentfailures or other causes, or if there are changes in materials orproduction procedures, the Engineer may suspend furtheracceptance of pipe sections. These procedures shall be effectiveuntil the Contractor demonstrates conformance to the approvedquality control procedures.

3. Pipe found to be defective as a result of a violation or omission ofthe quality control plan will be rejected, and the Contractor will berequired to replace the defective pipe with pipe that meets thesespecifications.

4. Individual pipe sections may be repaired when the defects are notsubject to rejection under the above paragraph and are the result of

02662-4 R-04


5/18


an occasional imperfection in pipe manufacture or minor accidentaldamage. The proposed method of repair shall be submitted to theEngineer and approved prior to the repair being made. Repairsshall be made in the presence of the Engineer.

1.6 DELIVERY, STORAGE, AND HANDLING

A. Completed Pipe Sections:

1. Pipe shall be handled carefully with belt slings or other approveddevices. Pipe sections shall be handled with a two-point pickup.The pickup points shall be located between 1/5 and 1/4 of the pipesection length from each end of the pipe section. The handlingdevices shall be constructed so that no metal bears against thepipe surfaces and so that the bearing is uniform. The width of beltslings or other approved handling devices shall be adequate toprevent damage to the pipe. The pipe shall at no time be dropped,

but shall be lowered carefully into position.

2. Pipe shall be loaded and secured carefully to avoid damage to pipeends during shipment.

3. During transportation each pipe section shall rest on saddlesshaped to the outside diameter of the pipe and located between 1/5and 1/4 of the pipe section length from the ends of the pipe section.The saddles shall be in contact with the bottom of the pipe along anarc of at least 120 degrees. Pipe shall be secured by the use ofpadded ties. A saddle, as described above, may be used to

support bevel sections, as required.

4. Except for operations which involve the placing of the shop appliedcement mortar lining, the pipe shall not be rolled at any time afterthe coating is applied, including storage, transportation, orinstallation. Pipe which is accidentally rolled or dropped shall beseparated from other pipe, and the inspectors acceptance stampshall be removed or painted over. The pipe may be reinspectedand accepted, accepted after repair, or rejected in conformancewith these specifications.

5. After the mortar lining has cured, and prior to the removal ofexternal bracing, internal bracing shall be placed in the pipe toprevent the maximum and minimum diameter, at any point, fromdeviating more than 0.5 percent from the nominal diameter. Eachpipe section shall be braced at three locations. Sufficient bearingsurface shall be provided at the ends of the braces inside the pipe,to protect the mortar lining. Braces shall remain in place until thepipe section is stulled or backfilled.

02662-5 R-04


6/18


6. Damaged pipe, pipe coating and pipe lining will be rejected by theEngineer. Pipe bell ends or pipe ends damaged in shipment orfield storage shall be returned to the manufacturing plant forrepairs, as approved. Rejected coating or lining may be repairedand resubmitted for inspection and approval, as to compliance with

these specifications.

7. During storage, the pipe shall be externally supported between 1/5and 1/4 of the pipe section length from the ends of each pipesection.

B. Pipe to be delivered to the Department shall be delivered to the DyerReservoir site as directed. Contractor shall deliver pipe and offload thepipe at the delivery location.

1.7 DEFINITIONS

A. A pipe section is defined as a section of steel pipe which is straight, hasa bevel or has a mitered joint.

B. A fitting is defined as a section of steel pipe which contains a nozzle,passhole, or a fabricated elbow.

C. A nozzle is defined as a section of pipe with a flange attached.

PART 2 PRODUCTS

2.1 MATERIALS

A. Hot-rolled steel sheet in coils used for welded steel pipe, fittings,manifold, nozzle reinforcing collars and butt straps shall be fabricated tothe thicknesses shown and from materials conforming to ASTM A 1018,HSLAS, Grade 45, or ASTM A 516, Grade 70, including the followingspecial requirements:

1. Steel shall be killed and made to fine grade practice.

2. Product Analysis is required, with testing frequency requirementscorresponding to Tension and Charpy V-Notch Tests.

3. Charpy V-Notch Impact Test, with the long axis of the specimensoriented transverse to the final direction of rolling, is required forsheet with thickness greater than 3/8 inch. Test temperature shallbe 10 degrees F or lower. Tests shall be conducted in accordancewith requirements of ASTM A 370. Acceptance criteria shall be25 ft-lb minimum for the average of three tests. No individual testshall have energy below 20 ft-lb. Lateral expansion opposite thenotch shall be recorded.

02662-6 R-04


7/18


4. The number of tests and the location of test specimens for TensionTests and Charpy V-Notch Impact Tests shall be as specified in

ASTM A 414 for Tensile Strength.

5. Acceptance criteria for subsize Charpy V-Notch Impact Test

specimens, to be used only when full size specimens cannot beobtained from the coil material, shall be in accordance withASTM A 20, Table A1.16.

6. Dimensional tolerances for steel coil shall conform to ASTM A 635,Table 4.

7. Coil edges shall be cut prior to welding.

B. Steel plate for the crotch plates shall conform to ASTM A 537, Class 1,including the following Supplementary Requirements:

1. S2, Product Analysis, is required with testing frequencyrequirements corresponding to Tension and Charpy V-Notch Tests.

2. S5, Charpy V-Notch Impact Test with the long axis of thespecimens oriented transverse to the final direction of rolling, isrequired for plate with thickness of 1/4 inch or greater. Testtemperature shall be 10 degrees F or lower. Acceptance criteriashall be 25 ft-lb minimum for the average of three tests. Noindividual test shall have energy below 20 ft-lb. Lateral expansionopposite the notch shall be recorded.

3. Acceptance criteria for subsize Charpy V-Notch Impact Testspecimens, to be used only when full size specimens cannot beobtained from the plate material, shall be in accordance with

ASTM A 20, Table A1.16.

4. The plate manufacturer shall perform heat treatment of plateswhere required.

5. The limits on Columbium may be increased to those allowed inASTM A 20, Table 1, Note c.

6. The steel plate shall have low sulfur (0.012 percent max.) and

sulfide shape control.

7. The plate shall receive through-thickness testing in accordance withASTM A 770, including Supplements S1, S2, and S3, except thatthe minimum reduction area specified in S3 shall be 25 percent.The plate shall have through thickness strengths of 80 percent ofthe minimum tensile and yield strengths specified in thespecification for the plate used.

02662-7 R-04


8/18


8. The plate shall receive ultrasonic inspection in accordance withASTM A 578, including Supplements S1, S2, S3, and S4, exceptthat the S2 requirement will be required only within 6 inches of thelocation of any weld.

C. Steel plate used for welded steel pipe and butt straps shall befabricated to the thicknesses shown and from materials conforming toASTM A 516, Grade 70, including the following SupplementaryRequirements:

D. S2, Product Analysis, is required with testing frequency requirementscorresponding to Tension Tests.

E. Steel for nozzles of various sizes shall conform to ASTM A 907,Grade 36, including the special requirements as specified inParagraph 2.01 A or ASTM A 516, Grade 70, including SupplementaryRequirements specified in Paragraph 2.01 B, or ASTM A 333, Grade 1.

F. Pipe flanges shall be forged in conformance with ASTM A 105,including following Supplementary Requirements:

1. S9, Heat Treatment. Forging shall be normalized.

2. S11, Carbon Equivalent. The maximum carbon equivalent, basedon heat analysis, shall be 0.40.

3. Weld-neck flanges shall conform to ANSI B16.5, class as shown.

4. Weld-neck flanges greater than 24 inches in diameter shall conformto MSS, SP-44, class as shown.

5. Slip-on hub type shall conform to AWWA C207, class as shown.

G. Steel for test bulkheads shall conform to ASTM A 516, Grade 70.

H. Steel for half couplings shall conform to ASTM A 350, Grade LF1including Supplementary Requirements:

1. S2, Product Analysis.

2. S6, Lateral Expansion.

2.2 FABRICATION

A. General:

1. Steel pipe shall be manufactured in accordance with the fabricationrequirements of AWWA C200 and these specifications. In case ofconflict, these specifications shall govern.

02662-8 R-04


9/18


2. Fabrication of metalwork for steel pipe shall conform to therequirements of Section 05000 Materials and Workmanship,except as specified.

3. Fittings shall be fabricated from steel pipe which has been

manufactured and hydrostatically tested.

4. Welds shall be tested as specified in Section 05000 Materials andWorkmanship.

5. When a lower limit or minimum dimension is given for a steelcomponent, the minus tolerance (as stated in the applicable ASTMspecification) for such limit or dimension shall be understood todefine the true lower limit or dimension.

6. Longitudinal, spiral, and circumferential seams shall be fullpenetration butt welds. Welds exposed on the outside of the pipe

shall be ground smooth.

7. The joining edges of longitudinal joints shall first be shaped to therequired curvature by preliminary forming.

8. Circumferential joints or weldments attached with fillet welds arenot allowed within one foot of the outside face of any concreteencasement.

9. Steel pipe shall have a maximum laying length of 42 feet or asotherwise approved.

10. The wye branch at Station 9+81 shall be stress relieved inaccordance with Section 05000 Materials and Workmanship. The78 inch steel pipe need not be stress relieved.

B. Fittings:

1. Fittings shall be fabricated from steel pipe which has beenmanufactured and hydrostatically tested as specified in this section.

2. Welds shall be tested as specified in Section 05000 Materials andWorkmanship.

3. Prior to welding the collar plate to the steel pipe section, the collarplate shall be drilled and tapped for air test pipe connections asshown.

4. After welding the collar plate to the steel pipe section, the weldedjoint shall be shop air tested as specified in Section 05000 Materials and Workmanship.

02662-9 R-04


10/18


5. Lining for the fittings shall be the same as the pipeline.

C. Field Joints:

1. Field joints for steel pipe shall be complete joint penetration buttjoints, double lap welded, or butt strap joints, as approved andshown.

a. Butt strap joints shall be drilled and tapped for air testconnections as shown. After welding, the welded joint shall beair tested as specified in Section 05000 Materials andWorkmanship.

b. Bell pipe ends for field joints shall be formed by expanding withsegmented dies on a hydraulic expander.

c. The final nondestructive testing of pipe bell rings shall be

performed after the bell rings are cold expanded.

D. Field Closures:

1. Field closures shall be constructed as shown.

2. Material for field closures shall conform to the applicable materialrequirements for the pipe as detailed in this section.

3. The butt strap shall be drilled and tapped for air test pipeconnections as shown. After welding, the welded joint shall be airtested as specified in Section 05000 Materials and Workmanship.

4. The exterior surfaces shall be coated as specified inSection 09970 Coatings.

5. Application of field applied cement mortar lining for interior jointsshall be in conformance with Section 09971 Cement MortarLining.

E. Tolerances:

1. Pipe sections shall be circular in cross section. The measured

circumference at any cross section except for pipe ends shall notbe less than the calculated circumference and shall not exceed thecalculated circumference at the cross section under considerationby more than 1/2 inch. For pipe ends, the measured circumferenceshall not be less than the calculated circumference and shall notexceed the calculated circumference by more than 3/8 inch. Localdistortions such as flat spots and sharp bends will not be allowed.

02662-10 R-04


11/18


2. After Welding:

a. Longitudinal and spiral joint abutting edges of plates shall nothave an offset at any point along the joint greater than 1/8 inch.

b. Circumferential joint abutting edges of plates shall not have anoffset at any point along the joint greater than 1/8 inch.

c. Offsets between 1/16 inch and 1/8 inch shall be repaired. Therepairs shall consist of strengthening the joint by addition ofweld metal. The finished weld shall be at a 4:1 taper.

3. The pipe ends for field type joints:

a. Pipe ends shall be fabricated to nominal design diameters.

b. Contact surfaces shall be free of irregularities and flat spots.

c. Ends of pipe sections to be field butt welded shall lie in a planenormal to the longitudinal axis of the section with a maximumdeviation of 1/8 inch on either side of the plane and provide a

joint space of 1/16 inch minimum to 1/8 inch maximum.

4. The pipe ends for sleeve coupling, insulating and noninsulating:

a. The outside surface at ends of piping to be connected bysleeve coupling shall be free from indentations, projections, androll marks for a distance of 18 inches from the end of pipe.

b. The circumference shall not be more than 1/8 inch larger or0 inch smaller than the outside circumference computed fromthe designated outside diameter of the pipe.

c. The difference between maximum and minimum outsidediameters at any cross section shall not exceed 1/4 inch.

d. Allowable surface irregularities shall conform toParagraph 2.02 E.7, except that the measurements shall bemade on the outside of the pipe, and the maximum feeler gagethickness shall not exceed 0.065 inch.

5. Out-of-roundness of pipe sections, as measured by the differencebetween the maximum and minimum diameter, shall not exceed1/4 inch in concrete encasements and at other restrained locations.

02662-11 R-04


12/18


6. Surface irregularities shall be measured by the use of a templateand a straightedge. The template and straightedge shall be madeof aluminum and be a minimum of 1/8 inch in thickness.

a. The template shall be fabricated to the nominal curvature of the

surface, extend over an arc of 30 degrees, and shall be placedagainst the surface perpendicular to the centerline of the pipe.

1) It shall not be possible to insert a feeler gauge greater than1/8 inch in thickness at any point under the template.

b. The straightedge shall be 10 feet long and placed parallel to thecenterline of the pipe.

1) It shall not be possible to insert a feeler gauge greater than1/8 inch in thickness at any point under the straightedge.

c. The template and straightedge shall be notched in the center toallow for placement over the weld crown in order to inspect forsurface irregularities.

d. For areas exceeding the 1/8 inch tolerance, the pipe shall bebrought into tolerance. The use of hammers for this purposeshall not be allowed. The method of correction shall besubmitted to the Engineer and approved prior to making therepair. The repair shall be made in the presence of theEngineer.

F. Hydrostatic Testing:

1. Steel pipe shall be shop hydrostatically tested. The Contractorshall notify the Engineer in writing 10 days in advance ofhydrostatic testing.

2. Attachments, including nozzles, and reinforcing collars shall becompleted prior to testing.

3. Passholes may be attached to the pipe sections after the pipe ishydrostatically tested, providing:

a. In addition to the required 100 percent nondestructive testing ofthe complete joint penetration welds, each layer of fillet weldsshall be 100 percent magnetic particle tested.

b. The pipe lining and coating adjacent to the nozzle shall beremoved a sufficient distance to allow for adequate preheatingof the weld joint without causing damage to the lining orcoating.

02662-12 R-04


13/18


4. Testing may be performed in the horizontal or vertical position. Ifperformed horizontally, the test pressure shall be measured at thecenterline of the pipe. If performed vertically, the test pressureshall be measured at the top of the pipe. End seals used for testingshall not produce an inward pressure at the ends of the pipe.

5. The shop tested sections shall be slowly filled with water andentrapped air shall be released. The pressure shall be slowlyincreased until a pressure which will result in a minimumcircumferential stress in the pipe shell of 3/4 of the minimumspecified yield strength of the steel plate is reached. The testpressure shall be held while the test section is observed for leaks.

6. Defects in the test section shall be repaired and the hydrostatic testrepeated until no defects are found.

7. Mitered or beveled pipe sections shall be fabricated from previously

hydrostatically tested pipe sections and need not be hydrostaticallytest after fabrication provided:

a. Complete penetration welds on mitered or beveled pipesections fabricated in the shop or field shall be tested for leaksby the Bubble Emission Test method as well as the requirednondestructive testing as specified in Section 05000 Materialsand Workmanship.

b. Complete penetration welds on field closures shall be tested forleaks by the Bubble Emission Test method as well as the

required nondestructive testing as specified in Section 05000 Materials and Workmanship.

G. Marking:

1. The following shall be marked on the interior surface of the cementmortar lined pipe:

a. Pipe section identification number, corresponding with thenumber shown on the line layout diagram marked NO

APPARENT DEFECTS and the shop drawing number.

b. The name or trademark of the manufacturer.

c. The date of acceptable inspection by the Department at themanufacturers plant.

d. Pipe class designation.

e. Field top. Mark both ends of beveled sections.

02662-13 R-04


14/18


f. Field bottom. Stamp into spigot lip.

g. The degree of bevel, for beveled sections only.

h. The degree of miter, for mitered sections only.

i. Minimum preheat temperature for field welding. Mark bothends of pipe section.

PART 3 EXECUTION

3.1 INSTALLATION

A. General:

1. The Contractor shall install the steel pipe to lines and grades asshown.

2. Except for circumferential joints, field welding for erection purposesshall not be made directly to the pipe.

3. Steel pipe shall be placed in the trench using padded slings orother approved device which distributes the weight of the pipesufficiently to avoid damaging the pipe ends.

4. The maximum offset between adjacent pipe surfaces on the insideof the pipe at welded joints shall not be more than 1/8 inch. Offsetsbetween 1/16 inch and 1/8 inch shall be repaired. The repairs shallconsist of strengthening the joint by addition of weld metal. The

finished weld shall be at a 4:1 taper.

B. Changes in Alignment and Grade:

1. Changes in alignment and grade shall be made by beveling of lapjoints, pulling of lap joints, or the use of shop fabricated miteredbends. Beveled joints, pulled joints and joints adjacent to miterswill be field welded. Maximum pull is 1 degree. The maximumbevel is 3 degrees, 30 minutes and the maximum miter is7 degrees, 30 minutes, unless shown otherwise.

2. Exact locations of manhole nozzles, blowoff units, dewatering units,and air and vacuum units may be varied to suit the pipe alignment,subject to approval. Where a change in slope occurs at a manhole,the manhole shall be located on the lower slope. Air and vacuumunits shall be located at high points on the alignment.

3. Passholes shall be provided no more than 400 feet apart forpassing tools or welding lead, and providing access to the inside of

02662-14 R-04


15/18


the pipeline. Access to the inside of the pipeline may be providedat a nozzle of similar size as the passhole and suitable for the work.

4. Pipe sections shall be fitted together and joints drawn together inconformance with the clearances shown.

5. Welded lap joints may be pulled a maximum of 1 degree on oneside of the joint while the opposite side is held in position. Beveledlap joints shall be made by beveling the belled end of the pipe.Beveled lap joints shall not be pulled.

6. Where horizontal curves are shown on the plans, joint pulls, bevels,or miters shall be spaced to provide a radius not less than theradius shown.

C. Laying Pipe:

1. Pipe shall be laid to the lines and grades shown.

2. Holes shall be excavated as required to provide clearances forassembling, welding, inspecting and coating the pipe joints.

D. Tolerances:

1. Tolerances for departure from and return to established lines andgrades shall be 1/16 inch per foot of pipe, but not more than threeinches at any point in the line. Reverse slopes will not be allowed.

2. Approved temporary supports and test supports shall be providedto hold the piping in position and to maintain the roundness withinspecified tolerances. Approved external supports for concreteencased piping shall remain in place.

3. Temporary supports shall not be removed until after completion ofbackfill.

4. After Installation:

a. After encasement or installation, the out-of-roundness of pipe atany cross section shall not exceed 5/8 inch for the 78 inch

diameter pipe.

b. Seven days after completion of backfill operations to finalgrade, the out-of-roundness of the buried pipe shall not exceed3/4 inch for the 78 inch diameter pipe.

02662-15 R-04


16/18


c. Out-of-roundness of the pipe is defined as the differencebetween the maximum and minimum diameter of the pipe at across section.

E. Welded Field Joints:

1. Welded field joints shall be double lap welded joints, butt strapjoints or complete joint penetration butt welds as shown. Changesin alignment and grade shall not be made at complete jointpenetration field butt welded joints.

2. Equipment shall be provided to support the pipe sections, maintainline and grade and provide adjustments for temperature changes.

A joint alignment device or method shall be provided to position andhold the ends of the pipes with a uniform circumferential gap forwelding.

3. Field welds for girth joints in the piping shall be in the direction ofpipe laying as each pipe section is installed. Concurrent welding atmore than one pipe joint shall be subject to approved procedureswhich minimize longitudinal stresses in the pipe shell andcompensate for ambient temperature changes and weld shrinkage.

4. Contractors pipe laying and backfilling operations shall limitlongitudinal stresses in the pipe caused by temperature variations.

A maximum of 160 feet of pipe may be connected to a section ofpreviously backfilled pipe prior to backfilling. For pipe layingoperations where over 160 feet of pipe is laid prior to backfilling,

joints located approximately 320 feet apart will be left unweldeduntil adjacent sections are backfilled to a minimum of 2 feet abovethe pipe crown and to within 20 feet of each joint. These joints shallbe welded when the ambient temperature is the lowest of the day.

5. After welding, double lap welded and butt strap joints shall be airtested in accordance with Section 05000 Materials andWorkmanship.

F. Test Bulkheads:

1. Test bulkheads shall be installed as shown.

2. After completion of the final watertightness test, the bulkhead atStation 5+88 shall be removed. That bulkhead shall become theContractors property and shall be removed from the work site. Theother bulkheads shall be left in place.

3. After removal of the bulkhead, protrusions shall be ground smooth,damage to the pipe shell shall be repaired, as approved, and the

02662-16 R-04


17/18


pipe lined and coated as specified in Section 09971 CementMortar Lining and Section 09970 Coatings.

3.2 FIELD TESTING REQUIREMENTS

A. The Contractor shall notify the Engineer in writing 3 days in advance offield testing.

B. The Contractor shall test the completed pipeline for watertightness afterbackfilling operations are completed. The Contractor shall providebulkheads, piping, valves, pumps, and other facilities required to testthe pipe and to dewater the pipe after the tests are completed.

C. Testing of the pipeline shall not be performed earlier than 14 days afterplacing of concrete that will be subject to hydrostatic pressure duringtesting.

D. Prior to testing, the pipeline shall be filled with water and allowed tostand for 15 days to saturate the lining. During this period the amountof water required to be added to maintain the water surface at thedesignated test elevation shall be recorded for each 24 hour period.

E. The test period shall be for 24 consecutive hours, during which timethere shall be no leakage from the pipe.

F. When draining the pipeline for repair, the water shall be drained asdirected.

G. Defects in the pipeline piping shall be repaired and the test repeateduntil no defects are found.

H. Upon completion of repairs or replacement, the pipe test shall berepeated as stated above. Upon completion of testing, the testingwater shall be drained from the pipeline, test bulkheads and test fittingsremoved; pipe repaired, and pipe lining repaired at removed bulkheadand test fitting locations, as directed.

I. Testing shall be performed by the Contractor and witnessed by theEngineer over a 24 hour period at a sustained pressure of 950 feetelevation.

02662-17 R-04


18/18


PART 4 MEASUREMENT AND PAYMENT

4.1 MEASUREMENT

A. Measurement for payment for the contract item 78 Inch Diameter SteelPipe and Fittings will be by the linear foot and will be the number oflinear feet placed in the work.

B. Measurement for payment for the contract item Furnish 78 InchDiameter Steel Pipe will be by the linear foot and will be the number oflinear feet furnished to the Department.

4.2 PAYMENT

A. The contract prices will be paid for 78 INCH DIAMETER STEEL PIPEAND FITTINGS; and FURNISH 78 INCH DIAMETER STEEL PIPE;which prices shall include full compensation for all costs incurred under

this section.

END OF SECTION

02662-18 R-04

steel pipe and fittings

Documents