What is the correct gasket material for a drinking water pipeline?

EPDM (Ethylene Propylene Diene Monomer) is the specified material for water and sewage applications as per Clause 4.1.

What is the maximum allowed compression set for an EPDM gasket?

The maximum compression set is 20% when tested for 22 hours at 70°C, as per Table 1.

Can an EPDM gasket be used for a natural gas pipe?

No. NBR (Nitrile Butadiene Rubber) gaskets must be used for gas applications due to their resistance to oils and gas condensates, as specified in Clause 4.2 and Tables 2 & 3.

What is the typical hardness requirement for these gaskets?

The hardness must be within ±5 IRHD of a nominal value (e.g., 50, 60, or 70) specified by the purchaser, according to Table 1.

IS 14930 Part 1

: 2001

Gaskets for use with ASB, CI & DI pipes for water, gas and sewage - Part 1: Elastomeric sealing gaskets (EPDM, NBR) - Specification

CurrentFrequently UsedSpecificationBIMWater Resources · Water Supply and Plumbing

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This standard specifies the material, physical property requirements, and testing methods for elastomeric sealing gaskets made from EPDM and NBR. These gaskets are intended for use in the joints of Asbestos Cement (ASB), Cast Iron (CI), and Ductile Iron (DI) pipes carrying water, gas, or sewage.

Specifies requirements for elastomeric sealing gaskets used in joints of asbestos cement, cast iron, and ductile iron pipes.

Quick Reference Values

Hardness (Nominal for EPDM/NBR)Specified value ± 5 IRHD

Minimum Tensile Strength (EPDM)10 MPa

Minimum Elongation at Break (EPDM)350 %

Maximum Compression Set (EPDM, 22h @ 70°C)20 %

Maximum Water Absorption (EPDM, 7 days @ 70°C)10 % by mass

Maximum Volume Change in Oil (NBR, 72h @ 100°C)+15 %

Practical Notes

Ensure the correct gasket material is used: EPDM for water/sewage applications and NBR for gas/oil applications due to its required resistance.

A visual inspection for defects like cracks, blisters, or foreign matter is a mandatory first check before installation, as per Clause 6.

Always request and verify the Manufacturer's Test Certificate (MTC) to ensure the supplied gaskets comply with the physical requirements listed in Table 1.