Can IS 404 lead pipes be used for drinking water?

No, the use of lead pipes for potable water is obsolete and strictly prohibited in modern engineering due to severe toxicity and health risks.

What were the traditional applications for these pipes?

They were historically used for soil, waste, ventilating pipes, and gas transport where chemical-grade high-purity lead was not strictly required.

How does this differ from chemical-purpose lead pipes?

Pipes for chemical purposes require extremely high purity lead (often 99.99%) to resist severe acidic or chemical corrosion, whereas IS 404 covers lower-purity, general-purpose plumbing lead.

IS 404

: 1993

Lead Pipes for Other than Chemical Purposes - Specification

CurrentRareSpecificationMEP · Aluminium and Non-Ferrous Metals

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This standard specifies the dimensions, tolerances, and material requirements for lead pipes used for applications other than chemical purposes, such as historical drainage, soil, and waste discharge systems. It is rarely used in modern new construction due to the well-documented health hazards of lead.

Specifies the requirements for lead pipes intended for uses other than chemical purposes, such as plumbing.

Quick Reference Values

Typical minimum lead purity99.5%

Maximum permissible impurities0.5%

Bore sizes typically covered10 mm to 150 mm

Practical Notes

Modern plumbing and health codes universally prohibit the use of lead pipes for potable (drinking) water systems due to the risk of lead poisoning.

Today, this standard is mainly referenced for the repair, maintenance, or historically accurate restoration of existing lead plumbing in heritage buildings, or for specific non-potable industrial uses.