2 Specification for GRP Piping

8/12/2019 2 Specification for GRP Piping

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8122-03-ES-001

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Specification for Glass Reinforced Plastic (GRP) piping

1 Scope

This specification defines the requirements for glass-fiber-reinforced thermosetting resin pipe

(RTRP) as defined in AWWA C950) couplings, fittings, flanges and spools using polyester, vinylester or epoxy resin with restrained adhesive-bonded joints, restrained gasketed joints, butt jointswith laminated overlay, bell & spigot joints with laminated overlay.

The minimum pressure/temperature rating of the pipe and fittings shall be 10 bar (150 psig) at 65deg C

2 Materials and Fabrication

The products shall be defined by a cell classification system and shall meet the performancerequirements of Section 4 of this specification.

Pipe and couplings shall be filament-wound using polyester, vinylester or epoxy resin andfiberglass reinforcement or centrifugally cast.

Resin SystemResin shall be suitable for the services specified, and shall be noted by the vendor in hisproposal. The resin system used for the interior liner, the structural wall, fittings, and adhesivesshall be polyester, vinylester or epoxy, with suitable curing agents so that it meets theperformance requirements and temperature limits in this Specification.

Glass Reinforcements

The structural wall reinforcement shall be of commercial-grade glass fiber ( E type) treated witha compatible binder and coupling agent

Additives

Resin additives such as pigments, dyes or coloring agents may be used, provided they do notdetrimentally affect the performance of the pipe. The pipe exterior must contain a UV inhibitor.

Reinforcing Fiberglass Ribs

Pipe sizes 2600 mm and higher can be manufactured with reinforcing fiberglass external ribs toachieve the required stiffness.

Adhesives and solvent cleaners

Adhesive and solvent cleaner for bonded joints shall be of a material suitable for the services anddesign conditions specified. It shall be mutually compatible with the resin used to manufacturethe pipe. Adhesives and solvent cleaners shall be provided in a self-contained kit with allnecessary materials and instructions. Shelf life of adhesive and solvent cleaner kits, at 35 deg C,shall not be less than 9 months from the date of shipment. Adhesive and solvent cleaner kitsshall indicate the required storage conditions and date of expiration of shelf life.

Flexible Elastomeric Seals and Joint Tightness

The chemical composition of the flexible elastomeric seals shall be compatible with the type ofservice and environment to which it will be subjected.

Fittings

Flanges, bends, reducers, tees, wyes and other fittings may be compression-molded,manufactured from mitered section of pipe, or manufactured by the filament wound process,using thermosetting polyester, vinylester or epoxy resin and fiberglass reinforcement such thatthe resistance to chemical attack, the pressure rating, and the temperature rating, are equal to orbetter than that of the pipe.

Except for compression-molded fittings, all pipe, fitting, and flange surfaces that are exposed tothe fluid shall have a smooth, uniform, resin-rich liner. The interior liner shall be reinforced with

either non-woven polyester fibers or epoxy. Liner reinforcement is not required on 100 mm andsmaller fittings at the mitered joints, provided all gaps at the joints are completely filled with resinto act as an effective corrosion barrier and to prevent the presence of any exposed glass fibers.


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All machined or cut surfaces shall be post-coated with catalyzed resin, except for bondingsurfaces for field points and mechanical RTR (fiberglass) threads. Post-coating shall beperformed within four hours of machining or other surface preparation.

Adhesive-bonded joints shall be bell-and-spigot type and shall not require a field-appliedoverwrap to develop the required strength.

Flanges shall be flat-faced, or flat-faced with a confined O-ring gasket groove.

All pipe, fittings and flanges for a particular installation shall be manufactured or supplied by thesame Vendor to avoid incompatibility problems

Fasteners and Gaskets

Machine bolts shall be as per A307 Gr B, galvanised and nuts shall be as per A563 Gr Bgalvanised. The gaskets shall be full face, non metallic as per B16.21. suitable for the fluid.

3 Dimensions and Tolerances

Dimensions and surface finishes shall be measured in accordance with ASTM D3567 andASME/ANSI B46.1. The average wall thickness of the pipe shall not be less than the nominalwall thickness published in the manufacturer literature. The minimum wall thickness at any point

shall not be less than 87.5% of the nominal wall thickness, when measured in accordance withASTM D3567.

Flange bolt hole sizes and the number of bolt holes and bolt hole circles for up to 600 mmnominal pipe size shall comply with ASME/ANSI B16.5. For larger than 600 mm nominal pipesize, flange bolt holes sizes and the number of bolt holes and bolt hole circles shall comply with

AWWA C207, or MSS SP-44.

Unless otherwise defined in the Purchase Order, specified face-to-face, centerline-to-face, andcenterline-to-centerline dimensions of special fabrications (spools) shall have a tolerance of + 6mm. The lateral offset of flanges from the pipe centerline and rotation of flanges shall be limitedto 3 mm. The flange face alignment shall be within 1.5 mm of the required position whenmeasured across the flange face. These tolerances shall be doubled for piping 450 mm nominalsize and larger.

4 Performance Requirements

General

The Manufacturer shall perform following Design Type tests and Test reports shall be furnishedto Buyer.Testing and test reports shall pertain to items representative of those supplied under thePurchase Order. Design type testing shall be repeated after any change in materials,manufacturing methods, or product design.

Design Type Tests

Hydrostatic Design Stress and Pressure Ratings

The long-term hydrostatic strength of pipe shall be determined in accordance with Procedure A

or B of ASTM D2992. The Manufacturer shall select the procedure and one representative sizefor these tests. Adhesive joints shall be included, using both the factory and field adhesives andtheir respective joining and curing procedures, if different.

Pressure rating calculations shall be performed in accordance with AWWA-C950.

The calculated pressure ratings shall equal or exceed the pressure rating of the piping specifiedin section 1 of this specification and in the Purchase Order.

Long-Term Ring Bending Strength

Long-term ring bending strength shall be determined in accordance with AWWA C950, withstress relaxation or creep failure tests instrumented to detect an abrupt, significant reduction inmechanical properties.

Flange Pressure Rating

Flanges shall be pressure-rated and marked in accordance with ASTM D4024. Themanufacturer shall test, on a one-time basis, three samples of minimum, median and maximumflange sizes of the manufacturing range at the plant for each pressure rating.


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Joint Integrity Test

Joints shall be of the adhesive-bonded, reinforced overlays or mechanical type joints, as definedin AWWA C950.

The joints shall meet or exceed the hoop tensile and axial tensile strength requirements of thepipe as tested in accordance with AWWA C950. One test for each jointing method shall be

performed to establish design stress values.

5 Test Requirements

Pipe Stiffness

The pipe stiffness shall be determined in accordance with AWWA C950.

The pipe shall exhibit, without structural damage, the minimum stiffness at 5 percent deflection of124 kPa (18 psi)

Axial Tensile Strength

The pipe shall be sampled and tested for axial tensile strength in accordance with AWWA C950.The test results shall meet or exceed the minimum axial tensile strength requirements listed in

Table 11 of AWWA C950

Hoop Tensile Strength

The pipe shall be sampled and tested for hoop tensile strength in accordance with AWWA C950.The test results shall meet or exceed the minimum hoop tensile strength requirements listed inTable 10 of AWWA C950

Visual Inspection

Components shall be visually inspected for compliance with the defect limits in Table below

Name Interior Surface Exterior Surface O-RingSealing Surface

1. Air Bubble(Void)

Not to penetrate anysurface - limits apply toall surfaces, maximumdimension 6 mmdiameter, 0.75 mmthickness, 4 per 0.09 sq.m area

Same requirementsas for InteriorSurface


2. ForeignInclusion

Not to penetrate anysurface - limits apply toall surfaces, maximumdimension 1.5 mm, 1 per0.09 sq. m area



3. Pit

(Pinhole)

Max. depth 0.25 mm,

maximum width 1.5 mm,35 per sq. cm

Not to penetrate

reinforced wall

Maximum

dimension 0.25 mm

5. Scratch Max. depth 0.40 mm notto exceed liner thickness

Not to penetratereinforced wall

Maximum depth0.25 mm

6. Wrinkle Max. depth 2 mm Not applicable None allowed

Hydrostatic Leak Test

All pipe, fittings and spools shall be hydrostatically leak tested at the factory in accordance withAWWA C950, to a test pressure equal to twice the pressure rating.

If air is used as the pressurizing medium, the component shall be completely submerged in clearwater during the pressurization and inspection period.

All pipe, fittings, spools and joints shall be visually examined for leakage. Any item showingevidence of weeping or leakage shall be rejected.


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The standard adhesive-bonded flanges, standard adapters, saddles, nonstandard fittings withplain ends configurations, and prefabricated spools with plain ends that cannot be hydrotested atthe manufacturing facility due to size limitations and configurations shall be handled as follows:

a) The Vendor shall mark these items to be field hydrotested.

b) The assembled items and the testing shall be at Vendor's risk.

c) Buyer's Representative shall witness the test. The rejected parts shall be removed from thesystem or repaired by the. The replaced or repaired part shall be retested.

Rejection

If the results of any QC test do not conform to the requirements of this specification, that testshall be repeated on two additional samples from the same lot of pipe. Each of the two samplesshall conform to the requirements specified. If either of the two additional samples fail, the lotshall be rejected.

6 Documentation

Drawings

Product drawings that show product dimensions and tolerances, including couplings, fittings andjoints, shall be submitted

Test Reports

The Manufacturer's test reports, both Design Type tests and acceptance tests, shall be furnishedto the Buyer.

7 Identification Tagging

All components shall be permanently marked for proper identification. All required marking shallremain legible under normal handling and installation practices. The marking shall include thefollowing:

- Manufacturer's name or trade name, and identification code

- Pressure/temperature rating- Nominal diameter

8 Packing

Unless otherwise specified in the Purchase Order, pipe, fittings, O-rings, gaskets, locking rings,and adhesives shall be packed suitably, to withstand rough handling.

End Protectors

End protectors shall be provided and securely attached to both bell and spigot ends of all pipe.

End protectors shall be designed to protect the pipe ends from impact damage, contamination,and weathering of machined bonding surfaces due to ultraviolet exposure. They shall have anopen center permitting inspection of the pipe bore.

Flange faces on fabricated piping shall have 12 mm minimum protective plywood covers notsmaller than the flange outside diameter

2 Specification for GRP Piping

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