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IS 12709 : 1994glass-fibre reinforced plastic (GRP) pipes joints and fittings for use in potable water supply

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AWWA C950 · ISO 10639 · ASTM D3517
CurrentSpecializedSpecificationBIMWater Resources · Plastic Piping System
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OverviewValues7InternationalTablesFAQ4Related

IS 12709:1994 is the Indian Standard (BIS) for glass-fibre reinforced plastic (grp) pipes joints and fittings for use in potable water supply. This standard specifies the requirements for glass-fibre reinforced plastic (GRP) pipes, joints, and fittings up to 2000 mm nominal diameter. It covers material properties, dimensions, performance criteria like pressure (PN) and stiffness (SN) classes, and associated testing methods for their use in potable water supply systems.

glass-fibre reinforced plastic (GRP) pipes joints and fittings for use in potable water supply

Overview

Status
Current
Usage level
Specialized
Domain
Water Resources — Plastic Piping System
Type
Specification
Amendments
Amendment 1 (May 1996)
International equivalents
AWWA C950-20 · American Water Works Association (AWWA), USAISO 10639:2019 · International Organization for Standardization (ISO)ASTM D3517-19 · American Society for Testing and Materials (ASTM), USAEN 1796:2013 · European Committee for Standardization (CEN), Europe
Typically used with
IS 2530IS 4905IS 7328IS 12288IS 13360
Also on InfraLens for IS 12709
7Key values3Tables4FAQs

BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.

Practical Notes
! GRP pipe handling requires care to avoid impact damage, which can cause micro-cracking not visible to the naked eye. Use wide fabric slings for lifting.
! Jointing is a critical activity. Ensure elastomeric rings are clean, properly lubricated, and correctly seated as per the manufacturer's instructions to prevent long-term leakage.
! Verify the compatibility of the resin system with specific water treatment chemicals (e.g., high chlorine concentrations) that might be used, as the standard primarily covers standard potable water.
Frequently referenced clauses
Cl. 4MaterialsCl. 5Dimensions and TolerancesCl. 6Performance RequirementsCl. 7TestsCl. 8MarkingAnnex B - Long-Term Hydrostatic Strength
Pulled from IS 12709:1994. Browse the full clause & table index below in Tables & Referenced Sections.
Updates & Amendments1 amendment
Amendment 1 (May 1996)
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
GRPglass fibreplasticthermosetting resinpolyester resin

International Equivalents

Similar International Standards
AWWA C950-20American Water Works Association (AWWA), USA
HighCurrent
Fiberglass Pressure Pipe
Covers fiberglass (GRP) pipe for water transmission and distribution, a direct equivalent.
ISO 10639:2019International Organization for Standardization (ISO)
HighCurrent
Plastics piping systems for pressure and non-pressure water supply — Glass-reinforced thermosetting plastics (GRP) systems based on unsaturated polyester (UP) resin
Specifies requirements for GRP piping systems for water supply, closely aligning with the IS code's intent.
ASTM D3517-19American Society for Testing and Materials (ASTM), USA
HighCurrent
Standard Specification for 'Fiberglass' (Glass-Fiber-Reinforced Thermosetting-Resin) Pressure Pipe
Covers GRP pressure pipe; while not limited to potable water, it's a primary material specification for this application.
EN 1796:2013European Committee for Standardization (CEN), Europe
HighCurrent
Plastics piping systems for water supply with or without pressure - Glass-reinforced thermosetting plastics (GRP) based on unsaturated polyester resin (UP)
European standard for GRP piping systems used for water supply, including potable water.
Key Differences
≠IS 12709 is largely prescriptive, specifying minimum wall thicknesses for certain pressure classes, whereas standards like AWWA C950 are performance-based, allowing manufacturers to determine wall thickness as long as performance criteria (pressure, stiffness) are met.
≠Potability requirements in IS 12709 refer to Indian standards (e.g., IS 10146 for effect on water quality), while international codes reference region-specific certifications like NSF/ANSI/CAN 61 in North America or national regulations within the EU.
≠IS 12709:1994 specifies pressure classes in kgf/cm² (e.g., PN 6, PN 10). AWWA C950 uses pressure classes in psi (e.g., 50, 100, 150 psi), and ISO/EN standards use PN bars, leading to slightly different pressure steps.
≠The Indian standard is a 1994 version (reaffirmed), while international counterparts are updated more frequently (e.g., 2019/2020), incorporating more recent advancements in materials, testing protocols, and statistical analysis for long-term performance.
Key Similarities
≈All standards are based on the same core technology: composite pipes made from glass-fibre reinforcement embedded in a thermosetting resin matrix (typically unsaturated polyester).
≈A 50-year design life is a common fundamental principle, established through long-term hydrostatic strength testing and regression analysis to predict long-term performance.
≈Key performance tests are common across all standards, including hydrostatic leak-tightness tests, pipe stiffness tests, and long-term hydrostatic strength evaluation.
≈The primary manufacturing methods acknowledged, such as filament winding and centrifugal casting, are consistent across the Indian and international standards.
≈All standards specify requirements for common jointing systems, such as spigot-and-socket type flexible joints with elastomeric seals and rigid flanged joints.
Parameter Comparison
ParameterIS ValueInternationalSource
Pipe StiffnessSpecifies classes A, B, C with minimums of 2500, 5000, 10000 N/m² respectively.Specifies nominal stiffness (SN) classes SN 2500, SN 5000, SN 10000 N/m².ISO 10639:2019
Wall Thickness DesignPrescriptive: Specifies minimum wall thickness for given pressure/diameter combinations.Performance-based: Wall thickness is determined by the manufacturer to meet required pressure and stiffness ratings.AWWA C950-20
Short-Term Hydrostatic Test (Type Test)1.5 times the pressure rating (PN) for 24 hours.2.0 times the pressure class, with testing methodology focused on cyclic and surge pressure qualification.AWWA C950-20
Long-Term Design BasisRegression analysis of stress-rupture data to determine a 50-year extrapolated strength.Regression analysis to determine the 50-year Hydrostatic Design Basis (HDB).ASTM D3517-19
Degree of Cure (Barcol Hardness)Minimum 90% of the value obtained on a fully cured resin casting.Minimum 90% of the manufacturer's specified hardness for the cured resin.ASTM D3517-19
Test for Potable Water ContactTests for taste, odour, and toxic substances as per IS 10146.Evaluation of material for health effects in accordance with NSF/ANSI/CAN 61.AWWA C950-20
⚠ Verify details from original standards before use

Key Values7

Quick Reference Values
Standard Pressure Classes (PN)0.1, 0.25, 0.4, 0.6, 1.0, and 1.6 MPa
Standard Stiffness Classes (SN)2500, 5000, and 10000 N/m²
Short-Term Rupture Test Pressure4 x PN (for pipes up to 300mm) or 3.5 x PN (for pipes >300mm)
Short-Term Hydrostatic Test Pressure (Type Test)2 x PN for 1 hour
Minimum Barcol Hardness90% of the value of a fully cured un-reinforced resin casting
Water Absorption LimitMax 0.2% by mass
Long-term Hydrostatic Strength Test Duration10,000 hours

Tables & Referenced Sections

Key Tables
Table 1 - Dimensions of Pipes
Table 2 - Dimensions of Sockets for Elastomeric Sealing Ring Type Joints
Table 3 - Performance Requirements
Key Clauses
Clause 4 - Materials
Clause 5 - Dimensions and Tolerances
Clause 6 - Performance Requirements
Clause 7 - Tests
Clause 8 - Marking
Annex B - Long-Term Hydrostatic Strength

Related Resources on InfraLens

Cross-Referenced Codes
IS 2530:1963Methods of Sampling of Paints, Varnishes and ...
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IS 4905:1968Methods for Random Sampling
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IS 7328:2008High Alumina Cement
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IS 12288:1987Code of Practice for Use and Laying of Ductil...
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IS 13360:2013Packaged Natural Mineral Water
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Frequently Asked Questions4

What are the standard pressure ratings for GRP pipes under this code?+
The standard pressure classes (PN) are 0.1, 0.25, 0.4, 0.6, 1.0, and 1.6 MPa (Clause 5.1.1).
What is the basis for accepting a batch of pipes on-site?+
Acceptance is based on conformity to dimensional checks, short-term hydrostatic tests, stiffness tests, and other performance requirements as specified in the sampling plan (Annex E).
Is this code applicable for hot water or sewage?+
No, this standard is specifically for potable water supply, which implies cold water. Different standards and resin systems are required for sewage or hot water applications.
How is the long-term strength of the pipe determined?+
The code requires a regression analysis of hydrostatic test data to predict a 50-year strength, which is validated by a 10,000-hour sustained pressure test (Annex B).

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