09-Division 2-Section 02220 RC Pipeline-Version 2.0

ADSSC/GSCW Division 02 Section 02220

RC Pipelines. Materials, Installation and Testing Rev: 02 Jan. 2011 Page 1 of 15

ABU DHABI SEWERAGE SERVICES COMPANY (ADSSC)

GENERAL SPECIFICATION FOR CIVIL WORKS

DIVISION 2 SITEWORK

SECTION 02220 RC PIPELINES. MATERIALS, INSTALLATION AND TESTING

General Specification for Civil Works Abu Dhabi Sewerage Services Company

(ADSSC)



DOCUMENT CONTROL SHEET

Revision No. Date Revision Description/ Purpose of Issue

01 April 2008 First Issue.

02 Jan. 2011 ADSSC new logo

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TABLE OF CONTENTS

1 GENERAL ....................................................................................................... 4 1.1 SCOPE ................................................................................................ 4 1.2 RELATED DOCUMENTS ..................................................................... 4 1.3 STANDARDS ....................................................................................... 4 1.4 SUBMITTALS ....................................................................................... 4 1.4.1 PRODUCTS AND MATERIALS APPROVAL. ....................................... 4 1.4.2 METHOD STATEMENTS. .................................................................... 5 1.4.3 WORKING DRAWINGS. ...................................................................... 5 1.5 QUALITY CONTROL............................................................................ 5 1.6 DELIVERY, STORAGE AND HANDLING ............................................. 6 1.7 WARRANTY ......................................................................................... 7

2 PRODUCTS ..................................................................................................... 7 2.1 PIPES AND FITTINGS ......................................................................... 7 2.2 FABRICATION AND FABRICATION TOLERANCES ........................... 8 2.2.1 INTERNAL LINING. .............................................................................. 9 2.2.2 EXTERNAL EPOXY COATING. ......................................................... 10 2.2.3 CONCRETING. .................................................................................. 10 2.2.4 CONCRETE CURING. ....................................................................... 11 2.3 QUALITY CONTROL TESTS ............................................................. 11

3 EXECUTION .................................................................................................. 12 3.1 PIPE INSTALLATION ......................................................................... 12 3.2 FIELD JOINTING OF INTERNAL LINING .......................................... 13 3.3 HYDROSTATIC TESTING OF PIPELINES ........................................ 14


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1 GENERAL

1.1 SCOPE

This section of the specification gives the requirements for Reinforced Concrete (RC) pipeline materials and the installation and testing thereof in diameters 600mm and above for use in gravity sewer systems.

1.2 RELATED DOCUMENTS

The following sections of the specification shall be read in conjunction with this section.

Section 01000-07 Submittals. Section 01000-08 Quality control. Section 01000-09 Materials and equipment. Section 02120 Utility excavation, surround and backfill. Section 02300 Sewage works. Section 03300 Cast in place concrete. Section 03600 Concrete protection and waterproofing systems.

1.3 STANDARDS

All activities relating to this section of the specification shall comply with the following or approved equal standards.

ASTM C76 Standard specification for reinforced concrete culvert,

storm drain and sewer pipe. ASTM C361 Standard specification for reinforced concrete low head

pressure pipe. ASTM D412 Standard test method for vulcanised rubber and

thermoplastic rubbers and thermoplastic elastomers-tension.

BS 5911-1 Concrete pipes and ancillary concrete products. Specification for unreinforced concrete pipes (including jacking pipes) with flexible joints

BS EN 681 Elastomeric seals. Material requirements for pipe joint seals used in water and drainage applications. Vulcanised rubber.

BS EN 1916 Concrete pipes and fittings, unreinforced, steel fibre and reinforced

ISO 9000 Quality management systems. 1.4 SUBMITTALS

1.4.1 PRODUCTS AND MATERIALS APPROVAL.

i. In order to verify compliance with the specification the Contractor shall submit information for all products and materials used in the Works to the Engineer for approval sufficiently in advance of their use in accordance with the Contract programme allowing for ordering and


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approval times. Reference shall also be made to Section 01000-09 of the specification on products and materials approval. Information required shall comprise but not necessarily be limited to:

i. The manufacturer’s design calculations, complete and detailed

specification and test results of the proposed RC pipes and fittings required for the Works including manufacturers certificates of compliance with this section of the specification.

ii. Should any details of the pipes and fittings be altered in any way during manufacture from those proposed and approved by the Engineer, submit for the Engineer's approval the revised details and test results.

iii. Submit to the Engineer the results of all quality control tests carried out on the manufactured pipes and fittings as soon as practicable after testing and in any case not later than the time of delivery of the relevant pipes and fittings to the site.

iv. Pipe manufacturer’s guarantee that the pipe and its materials are suitable for its intended use.

v. Joint materials and gaskets. vi. Concrete protection systems.

1.4.2 METHOD STATEMENTS.

a) The Contractor shall submit method statements to the Engineer for approval 4 weeks in advance of commencing the site activity in accordance with Section 01000-07 of the specification. These shall comprise but not necessarily be limited to:

i. Procedures for handling, storage and installation of pipes. ii. Hydrostatic testing procedures for RC pipelines.

1.4.3 WORKING DRAWINGS.

a) The Contractor shall submit drawings to the Engineer for approval in advance of commencing the site activity in accordance with Section 0100007 of the specification. These shall comprise but not necessarily be limited to:

i. Drawings of the pipes, fittings, joints, pipe specials and the

assembly thereof, including details of reinforcement cage assemblies.

ii. Pipe laying diagram and schedule showing location, length, design designation and designation by number of each pipe section and pipe special to be furnished and installed.

iii. All data on curve and bends for both horizontal and vertical alignment.

1.5 QUALITY CONTROL

a) Prior to dispatch of any product and/or material from source the Contractor shall notify the Engineer in writing in sufficient time to allow


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the Engineer the opportunity to inspect and test the product and/or material prior to delivery in accordance with Section 01000-08 of the specification.

b) Products and materials shall be from a manufacturer/supplier who

operates a quality control system which is registered to ISO 9000 series or approved equal.

c) To allow the Engineer to inspect the Works the Contractor shall give the

Engineer a minimum of 24 hours notice of carrying out the following activities on site:

i. Installation of pipeline. ii. Jointing of internal plastic lining. iii. Hydrostatic testing of pipeline.

1.6 DELIVERY, STORAGE AND HANDLING

a) Delivery, storage and handling of products and materials shall be in accordance with the manufacturer’s recommendations, Section 01000-09 of the specification and the following provisions.

i. Delivery storage and handling shall at all times be performed in a

manner to avoid product damage. ii. Pipes and fittings shall not come in contact with any sharp

projections that may cause damage to the pipes and fittings during transportation loading and unloading. Ensure that pipes and fittings are well secured during transit and adequately supported along their length. Do not allow pipe to overhang the end of a vehicle during transportation.

iii. Ensure that pipes and fittings are lifted using nylon or large diameter rope slings positioned at a quarter of the pipe length from each end. Do not allow the use of wire rope chains or unpadded forks or clamps on forklifts to lift pipes.

iv. Store pipes and fittings on a flat level area and raised above the ground on timber bearers so that the lowest point of any pipe or fitting is not less than 150mm above the ground. Provide timber bearers at spacings recommended by the pipe manufacturer.

v. All coated pipes must be protected from UV exposure during storage.

vi. Store rubber joint rings in a well ventilated place free from exposure to sunlight and in their original packings until they are needed.

vii. The Contractor shall visually inspect all products upon delivery to site and report any damage to the Engineer.

Any products damaged during delivery, storage and handling

shall be marked by the Contractor and set aside. Proposals for repair of any damaged products shall be

submitted in writing to the Engineer for approval. Any damaged products deemed unsuitable for repair by the

Engineer shall be removed from site and replaced.


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1.7 WARRANTY

a) The manufacturer and the Contractor shall jointly guarantee the completed concrete protective coating and lining system to be free from defects in materials and workmanship for a period of 10 years from the date of completion of the Works.

b) The Contractor shall furnish ADSSC with the manufacturer’s guarantee

and warranty certificates for all materials and components used.

c) If the concrete protective coating and lining system are found to be defective during the warranty period, the manufacturer and Contractor shall replace and/or repair the concrete protective coating and lining system to the satisfaction of ADSSC at no cost to ADSSC

2 PRODUCTS

2.1 PIPES AND FITTINGS

a) Reinforced concrete pipes and fittings with PVC internal lining shall be manufactured to ASTM C76 class IV. Concrete for pipes and fittings shall be to the requirements of Division 3 of the specification and shall be made using sulphate resisting cement type V.

b) The entire interior surfaces of pipes and fittings shall be lined with a PVC

or HDPE lining to the product requirements as specified in Section 03600 of the specification.

c) Joints for reinforced concrete pipes.

i. All buried joints shall be spigot and socket type with EPDM rubber

sealing rings in accordance with ASTM C361 or BS EN 681. The sealing rings shall be supplied by the pipe manufacturer.

ii. The EPDM rubber sealing ring shall be of acceptable composition and must be contained in a groove on the spigot end of each pipe to ensure proper positioning and confinement in the annular space.

iii. The sealing rings shall be extruded or moulded and cured in such a manner that they will be dense, homogeneous and free from porosity, blisters, pitting and other imperfections. The rings must be extruded or moulded with smooth surfaces to the specified size within a tolerance of ±6 percent on any dimension, measured at any cross-section. Joints in the ring shall be vulcanised and not glued.

iv. Joints shall be capable of withstanding a draw of 13mm over and above the initial jointing allowance and remain watertight. The initial jointing allowance is the gap between the spigot and the shoulder of the socket measured parallel to the centre line of the pipeline and must not be less than 6mm or greater than 13mm or as recommended by the pipe manufacturer.

v. For pipes up to and including 600mm nominal internal diameter joints shall be capable of withstanding a deflection of not less than


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one and a half degrees in any direction and remaining watertight. For pipes over 600mm nominal internal diameter joints shall be capable of withstanding a deflection of half degree in any direction and remaining watertight.

vi. The pipe joints shall be capable of withstanding an external pressure equivalent to 10m head of water without leakage in both the straight and deflected positions.

d) Ensure that all pipes including cut lengths and all fittings before despatch

from the pipe manufacturer's works are indelibly marked as follows.

i. The manufacturer's name, initials, or identification mark. ii. The nominal internal diameter in mm. iii. The length in m. iv. Mark the classification i.e. pressure rating. v. The date of manufacture and batch number. vi. A stamp to show that they meet the required inspection

requirements and hydraulic tests at the point of manufacturer. vii. Stencil in legible letters the pipe identification number on the inside

and outside at each end. Ensure that the same number appears on all record sheets and documents relating to the manufacture delivery and testing of that pipe.

viii. The angle of bends or branches. ix. The manufacturing standard. x. The project or contract number.

2.2 FABRICATION AND FABRICATION TOLERANCES

a) Reinforced concrete pipes shall have a minimum nominal length of 2.5m and a maximum length of 6m unless otherwise specified or for special purposes such as curves or closures.

i. Use steel made forms with butt joints throughout when casting

pipes.

The surfaces of the forms adjacent to the pipe walls shall be smooth and true.

Forms shall be sufficiently tight with suitable gaskets provided at all form joints to prevent leakage of mortar.

The forms shall be braced and sufficiently stiff to withstand without detrimental deformation all operations incidental to the placement and compaction of concrete within the form.

The forms and end rings shall be constructed such that the pipe when manufactured has circular and cylindrical inner surfaces and they can be stripped from the pipe without damage to the pipe or its surfaces.

Clean and oil the forms at the start of each continuous production. Discard defective forms and end rings or adequately repair to the satisfaction of the Engineer.

ii. Accurately place reinforcement steel in the concrete wall. The


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minimum concrete cover over reinforcement shall be 25mm. Permissible variations shall be within the tolerances specified in ASTM C76 or BS 5911.

Tie the reinforcement steel in the pipe barrel to the

reinforcement steel in the pipe joint. Fabricate the reinforcement as a rigid cage of bars or wire fabric. Fabricate transverse reinforcement either as complete hoops, welded or lapped, or as a continuous helix. When the transverse reinforcement is formed as a cylindrical helix, finish off both ends of the cage as a complete hoop.

Use lapped or butt welded type splices.

iii. Butt weld splice must develop the full strength of the bar. Submit for testing, samples of welds proposed for use when required by the Engineer.

iv. Lap splice must extend 30 diameters when bars are being used for reinforcement, and 40 diameters when wire is being used.

Use suitable devices to hold the cage of reinforcement in its

circular shape, and to maintain the cage in place within the forms during the placing and consolidating of the concrete.

Use sufficient longitudinal reinforcement to provide a rigid cage of reinforcement. Providing enough longitudinal steel to provide a cage sufficient to retain its shape and position in the forms during the manufacturing process.

2.2.1 INTERNAL LINING.

a) Line internally with a PVC or HDPE lining covering the entire interior of the pipe.

b) Cast PVC or HDPE lining into the pipe at the time of manufacture of the

concrete pipe. Line the pipes entirely unless otherwise noted.

c) Cast sheets of PVC or HDPE lining as large as practicable to adequately fit the intended use.

i. Form large sheets by lapping basic size sheets a minimum of

13mm and fusing the sheets together in such manner as to produce a continuous welded joint. Do not allow tears, cracks, or separation in the laps.

ii. Cast joint strips of 100mm, ±1 mm in width x 2mm minimum thickness and bevel each edge prior to application.

iii. Cast welding strips of 25mm, ±2mm in width x 3mm minimum to 4mm maximum thickness. Use bevelled edges for all welding and outside corner strips at time of manufacture.

iv. Maintain all lining sheets, including locking extensions or studs, all joints corner, and welding strips free of cracks, cleavages, or defects adversely affecting the protective characteristics of the material. The Engineer may authorise the repair of such defects by


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approved methods. v. Apply and secure lining to the forms. Inspect and approve the

lining application prior to the placement of reinforcing steel. vi. Position lining so that the locking extensions are parallel with the

axis of the pipe.

d) For pipes up to and including 600 mm diameter form the lining around the spigot and socket to extend to the outside of the joint ring. Hold the lining accurately in position to provide finished surfaces to match the dimensions of an equivalent unlined pipe with the gasket held in a containing groove on the spigot face of the pipe.

e) For pipes of 750mm diameter and larger set the lining flush with the inner edge of the socket or spigot end of the pipe section. Extend the lining to approximately 60mm beyond the opposite end for jointing after pipe laying.

2.2.2 EXTERNAL EPOXY COATING.

a) Coat exterior of pipe with an approved solvent free 2 component epoxy system. All blowholes and surface defects must be filled with a two component solvent free epoxy filler prior to top coating.

b) Epoxy coating and its application shall be in accordance with Section

03600 of the specification.

c) Pipe manufacturing shall be by vertically cast method or other manufacturer's method as approved by the Engineer prior to pipe fabrication.

2.2.3 CONCRETING.

a) Mix, transport, place, and test concrete in accordance with Section 03300 of the specification. Prevent separation of the concrete materials and the displacement of reinforcement steel in the forms. Use external mechanical vibrators in an approved manner to vibrate the concrete when placing in the forms to avoid damage to the lining and produce a dense, homogeneous concrete securely anchoring the locking extensions into the concrete. Use the external vibrators particularly along the lower terminal edge of the plastic lining.

b) If approved, use stiffeners along the locking extensions of the lining.

Withdraw the stiffeners completely during the placement of concrete in the forms. Revibrate the concrete to consolidate the concrete in the void spaces caused by the withdrawal of the stiffener.

c) Protect the lining from damage when removing forms. Do not use sharp

instruments to pry forms from the lining surfaces. When forms are removed, pull out any nails that remain in the lining without tearing the lining. Clearly mark the resulting holes. Mark form tie holes before ties are snapped or broken off. Mark areas of serious abrasion of the lining. Abraded areas shall be repaired in accordance with the requirements of


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section 03600 of the specification. 2.2.4 CONCRETE CURING.

a) Concrete pipes and fittings. Provide adequate plant, piping, enclosures, and other facilities for curing the pipe. Control the temperature and humidity of the enclosures to keep the pipe surfaces moist at all times and maintain the temperature continuously between limits described below. Apply one of the methods of curing described below to the pipe, or any other method or combination of methods that will give satisfactory results as approved by the Engineer. Allow the pipe to be cured for a minimum 14 days so that the concrete will develop the specified compressive strength at 28 days or less.

i. Accelerated Curing. Place the pipe in a curing facility or otherwise

covered by a suitable enclosure that will allow proper circulation of moist air or steam. Maintain the ambient temperature within the enclosure between 15oC and 38oC by the introduction of heat until the initial set of the concrete occurs. After a delay period of one to four hours, increase the temperature at a rate not to exceed 2oC/hour, and thereafter, maintain the temperature between 32oC and 66o

ii. Water Curing. Apply water curing as soon as the concrete has set sufficiently to prevent damage to the exposed concrete surfaces. Maintain all exposed concrete surfaces moist by intermittent or continuous water spraying for a minimum 14 days. Maintain the total cure, consisting of the water cure and the ambient air cure sufficient to produce the concrete strengths specified.

C.

iii. Curing membranes shall not be used. 2.3 QUALITY CONTROL TESTS

a) The crushing strength of concrete pipes shall not be less than the values specified in ASTM C76 or BS 5911 for the respective classes of pipes shown on the drawings.

b) Linings shall be tested for pin holes, using an approved electrical spark

tester set at a minimum of 20,000 volts. Holes in sheets shall be satisfactorily repaired and re-tested prior to shipment to the pipe manufacturer.

c) The concrete pipes shall be substantially free from fracture, large or

deep cracks and surface roughness. The planes of the ends of the pipe shall be perpendicular to their longitudinal axis.

d) Carry out inspection procedures and tests in accordance with BS 5911

or ASTM C361.

e) Concrete pipes shall be rejected for any of the following reasons.

i. Failure to pass the hydrostatic test.


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ii. Transverse reinforcing steel found to be in excess of 6 mm out of specified position after the pipe is moulded.

iii. Unauthorised application of any wash coat of cement or grout. iv. Any crack showing two visible lines of separation for a continuous

length of 600mm or more, or an interrupted length of 900mm or more anywhere in evidence, both inside and outside except where such cracks occur during the external loading test.

v. Exposure of any wires, and positioning spacers or chairs used to hold the reinforcement cage in position, or steel reinforcement in any surface of the pipe.

vi. Any shattering or flaking of concrete at cracks. vii. Honeycombing on the exterior surfaces of the pipe exceeding 6 mm

in depth unless pointed with mortar or other approved material. viii. Any crack having a width of 0.25mm or more throughout a

continuous length of 300mm or more. ix. Any crack extending through the wall of the pipe and having a

length in excess of the wall thickness. x. When required by the Engineer, fill with cement grout any crack that

is 0.25 mm wide or wider and is not a cause for rejection. Use neat cement grout composed of cement mixed with water to fluid consistency for filling the cracks.

xi. A deficiency in the specified wall thickness of the pipe larger than permissible. The deficiencies in wall thickness permitted herein do not apply to gasket contact surfaces. Submit the tolerances of such contact surfaces for approval by the Engineer.

xii. A variation from the specified internal diameter in excess of 1% of interior surfaces which have been reworked after placing of the concrete. The variation in internal diameter permitted herein does not apply to gasket contact surface. Submit the tolerances of such contact surfaces for approval by the Engineer.

3 EXECUTION

3.1 PIPE INSTALLATION

a) Install pipe, fittings, and accessories in accordance with manufacturer's instructions.

b) Install bedding, surround and backfill as specified in section 02120 of the

specification and as shown on the drawings.

c) Install appurtenant facilities on the pipeline such as manholes, chambers, inlet structures and catch basins as specified in section 02300 of the specification.

d) Lay pipes from downstream to upstream with the socket end at the

upstream end of each pipe.

e) The pipeline shall be within 20mm of the specified line and the invert level shall be within 6mm of the specified value and shall be such that there is no backfall at any point.


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f) When cut pipe is required, ensure that the cutting is done by a machine,

leaving a smooth cut at right angles to the axis of the pipe.

g) When installing pipes, ensure the joint is cleaned and lubricated and that the rubber gasket is inserted in the groove of the socket end of the pipe. Align the spigot and insert home in the socket end. Use a metal feeler to check that the rubber gasket is correctly located. Spigot and socket flexible joints shall have the annular space between the pipe and socket sealed with an approved joint sealant to prevent the ingress of loose material or concrete. This sealing shall be carried out immediately on completion of a satisfactory initial hydraulic test prior to concreting or backfilling but not prior to the test.

h) Ensure that all pipes and fittings are sound and clean before laying.

When pipe laying is not in progress, ensure that the pipe ends are at all times fitted with watertight plugs or caps. The plugs or caps shall only be removed for the purposes of making a connection of the pipe end or testing the pipeline. The plugs or cap shall be replaced immediately on completion of the test.

3.2 FIELD JOINTING OF INTERNAL LINING

a) Field jointing of the internal lining shall be carried out as follows:

i. Do not make field joint to the lining until the lined pipe has been backfilled and pipe tests have been completed. Where groundwater is encountered, do not make any field joint until pumping of the groundwater has been discontinued and no visible leakage is evident at the joint. Ensure that the lining at joints is free of foreign materials and is clean and dry before joints are made.

ii. Hot joint compound shall not be brought in contact with the lining. iii. Do not apply coating of any kind over any joint, corner, or welding

strip, except where non-skid coating is applied to lining surfaces. iv. Do not apply adhesive to the surfaces of pipe joints, or the lining or

the joint strips. v. Ensure that the surface is clean to permit visual inspection and

sparktesting. Physically test all welds with a non destructive probing method. The Engineer may request to test installed lining using a spark type detector set at 20,000 volts. Properly repair and retest all areas of lining failing to meet the field test.

vi. Use a spark detector approved by the Engineer when spark testing the liner.

vii. Test each transverse welding strip, which extends to a lower edge of the lining. Extend the welding strips below the lining providing a tab. Apply a 5kg pull normal to the face of the pipe by means of a spring balance. Ensure that the lining adjoining the welding strip is held against the concrete during application of the force. Maintain the 5kg pull if the weld failure develops, until no further separation occurs. Retest defective welds after repairs have been made. Trim neatly tabs after the welding strip has passed inspection. Provide


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all test equipment required in the manner recommended by the manufacturer and as described above. The personnel provided to perform the testing shall be qualified.

3.3 HYDROSTATIC TESTING OF PIPELINES

a) Submit for the Engineer's approval details of the proposed methods and program for testing, including details of test equipment. Arrange for all tests to be witnessed by the Engineer or other person appointed by the Engineer. Provide everything necessary for carrying out testing and cleaning including water, pumps, gauges, piped connections, stop ends and all other temporary works. Ensure that pipelines are properly completed and supported before being put under test.

b) Use potable water for hydrostatic testing and pipeline cleaning.

c) Test the pipeline in lengths between manholes or such shorter lengths

as the Engineer may direct or permit.

d) Use properly designed fittings for the purpose of temporarily closing the openings in pipelines to be tested. Use fittings adequately strutted to withstand the pressure specified.

e) Ensure that the arrangement for testing a pipeline includes provision for

the purging of air from the pipeline prior to a water test. f) Where multiple pipelines are laid in common trench, test only one line at

any one time.

g) The Contractor must make his own arrangement for the supply and disposal of water used for testing which must be obtained from a source accepted by the Engineer.

h) The Contractor must complete the pipelines between the ends of laid

and tested lengths by tie-in sections of the shortest practical length.

i) Test all pipelines up to 1000mm diameter after completion of backfill up to the soffit of the pipeline. Clear the backfill around pipe joints to allow for visual inspection for leaks. Ensure that the trench is kept dry. Apply water head for testing of either depth to invert plus 1.0m, or 5.0m, whichever is the greater. Measure the head at the lower end of the pipeline.

j) Maintain the water head over a period of 30 minutes and if necessary,

add water from a measuring vessel at 10 minute intervals. Record the quantity of water added from the measuring vessel.

i. The leakage, quantity of water added, shall not exceed 0.5 X pipe

diameter (m) X length of pipe under test (m) litres.

k) For pipelines greater than 1000mm diameter, inspection for watertightness, workmanship and compliance to this specification shall


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be carried out by man entry.

l) Not more than 7 days prior to handover all pipelines shall be subject to an infiltration test as follows:

i. Test the pipeline in lengths between manholes or such shorter

lengths as the Engineer may direct or permit. Maximum length to be tested shall be 1 kilometre.

ii. Dewatering shall have been discontinued for at least 3 days prior to test.

iii. Volume of water infiltrating into the pipe shall be accurately measured for a minimum period of 1 hour.

iv. Maximum infiltration shall not exceed 1 litre per millimetre of pipe diameter per kilometre of pipe per day.

m) Keep a record of all tests and make them available for inspection. Hand

over test records to the Engineer for approval.

n) Pipes or joints shall not be accepted if any leakage or damage is visible during an internal inspection.

o) If the result of any test or inspection does not comply with the

requirements of the specification, the Contractor shall investigate the reason and carry out remedial work to the approval of the Engineer at no cost to ADSSC The pipeline shall then be re-tested. This process shall be repeated until the requirements of the specification are satisfied.

END OF SECTION

Documents

09-Division 2-Section 02220 RC Pipeline-Version 2.0