The standard defines specifications for high-density polyethylene (HDPE) pipes with nominal diameters from 16 mm to 1000 mm, intended for potable water distribution. It includes three material classifications—PE 63, PE 80, and PE 100—with pressure capacities ranging between 0.25 MPa and 1.6 MPa, suitable for underground and surface water mains. Detailed guidelines cover material properties, dimensional criteria, performance evaluations, testing protocols, and quality assurance to guarantee the safe and long-lasting use of HDPE pipes in drinking water systems across India.
Overview
The standard defines specifications for high-density polyethylene (HDPE) pipes with nominal diameters from 16 mm to 1000 mm, intended for potable water distribution. It includes three material classifications—PE 63, PE 80, and PE 100—with pressure capacities ranging between 0.25 MPa and 1.6 MPa, suitable for underground and surface water mains. Detailed guidelines cover material properties, dimensional criteria, performance evaluations, testing protocols, and quality assurance to guarantee the safe and long-lasting use of HDPE pipes in drinking water systems across India.
Audience
Contents
Structure
Frequently Asked
IS 4984 outlines HDPE pipe materials conforming to IS 7328 grades such as PEEWA-45-T-003, PEEWA-50-T-006, among others, featuring melt flow rates between 0.20 and 1.10 g/10 min. The minimum required strength (MRS) includes basic grades at 6.3 MPa and higher grades at 8.0 and 10.0 MPa. The standard also mandates a hydrostatic design stress of 5 MPa at 20°C for a 50-year lifespan, ensuring robust durability for potable water applications.
This specification covers HDPE pipes with nominal diameters ranging from 16 mm to 1000 mm, including sizes such as 20, 32, 50, 110, up to 1000 mm. Pressure ratings span from PN 2.5 (0.25 MPa) up to PN 16 (1.6 MPa), accommodating various operational pressures. Material grades PE 63, PE 80, and PE 100 are applied accordingly, enabling use in both buried and above-ground potable water pipelines.
The standard specifies that outside diameter measurements for pipes up to 110 mm are taken as the average of two perpendicular readings at least 300 mm from the pipe end, using accurate tools such as Pi tapes or circometers for larger diameters. Ovality is calculated as the difference between maximum and minimum outside diameters at the same cross-section. Tolerances on outside diameter are positive only, computed as max(0.009 × DN, 0.3 mm), rounded to the nearest 0.1 mm, ensuring precise dimensional control.
To validate hydraulic performance, pipes undergo an internal pressure creep rupture test at elevated temperatures (typically 80°C ±1°C) for durations depending on pipe grade (e.g., 165 hours for type tests). Pipes must exhibit no leakage, swelling, or burst during testing. Thermal stability is assessed by immersing water-filled pipes in a temperature-controlled bath for at least one hour. Sampling involves testing multiple specimens of the same size and pressure rating to ensure consistent quality.
Sampling is conducted using a random selection method based on sample size and lot quantity. If a random number table is unavailable, systematic sampling is applied by calculating the interval r = floor(N/n), where N is lot size and n is sample size, selecting every rth pipe. Sample sizes vary with lot size, for example, 3 samples for lots up to 150 pipes and up to 8 samples for larger lots. Composite samples of at least 3 pipes are used for tests like carbon black content and dispersion, ensuring representative and statistically valid quality checks.
Ask AI about any clause, requirement, or provision in IS 4984. Get instant, clause-cited responses powered by our indexed library.
Free tier includes 150 queries (50 AI + 100 Reference) · No credit card required