What is the primary performance test for these HDPE bends?

The Internal Pressure Creep Rupture Test (Hydrostatic Test), which is conducted at 80°C for 165 hours without failure (Clause 7.2).

What standard must the raw HDPE pipe comply with before fabrication?

The pipes used to fabricate the bends must conform to IS 4984 'High density polyethylene pipes for water supply'.

What is the maximum angle for a single segment used to make a bend?

The angle between the axes of adjoining pipe sections shall not be more than 22.5 degrees (Clause 3.1).

Is this standard part of a series?

Yes, it is Part 3 of IS 8360. Part 1 covers general requirements and test methods for all fabricated HDPE fittings.

IS 8360

: 2000

fabricated high-density polyethene (MDPE) fittings for potable water supplies, Part 2 Specific requirements for 90-degree tees

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This standard (Part 3) specifies the requirements for fabricated 90-degree bends made from High-Density Polyethylene (HDPE), intended for potable water supply pipelines. It covers materials, dimensions, performance tests like hydrostatic pressure resistance, and marking criteria for fittings ranging from 63 mm to 1000 mm nominal diameter.

fabricated high-density polyethene (MDPE) fittings for potable water supplies, Part 2 Specific requirements for 90-degree tees

Quick Reference Values

Hydrostatic test temperature80 °C

Hydrostatic test duration165 h

Hydrostatic test induced stress (PE 100)8.0 MPa

Wall thickness toleranceOnly positive tolerance is permitted, up to +0.1t

Reversion Test Temperature110 ± 2 °C

Bend segment angleNot more than 22.5 degrees

Practical Notes

This standard is for 'fabricated' bends, which are made by cutting and butt-welding straight pipe sections, not 'moulded' bends.

Ensure the base pipe used for fabrication conforms to IS 4984 for the correct material grade and pressure rating.

Verify the marking on the fitting, which should include the manufacturer, nominal size, material grade (e.g., PE 80, PE 100), and the ISI mark for compliance.