What class of fire is this extinguisher for?

It is exclusively for Class D fires, which involve combustible metals such as magnesium, aluminium, sodium, and potassium.

What are the standard capacities specified in IS 11833?

The standard covers capacities of 5, 10, 25, 50, and 75 kg (Clause 4.2).

What is the minimum discharge time for a 10 kg Class D extinguisher?

The minimum effective discharge time is 15 seconds as per Table 1.

What pressure is the extinguisher body tested to?

The body is hydrostatically tested to 3.0 MN/m² (or 30 kgf/cm²) according to Clause 8.2.1.

IS 11833

: 1986

Specification for a dry powder fire extinguisher for metal fires

CurrentSpecializedSpecificationFire Safety · Fire Fighting

Download PDF BIS Portal Google

This standard specifies the requirements for portable dry powder fire extinguishers used for fighting fires involving combustible metals, known as Class D fires. It covers the materials, construction, performance characteristics, testing procedures, and marking for these specialized extinguishers.

Specification for a dry powder fire extinguisher for metal fires

Quick Reference Values

Hydrostatic pressure test for body3.0 MN/m² (or 30 kgf/cm²)

Burst pressure test for body4.5 MN/m² (or 45 kgf/cm²)

Minimum effective discharge time for 5 kg extinguisher8 s

Minimum effective discharge time for 10 kg extinguisher15 s

Minimum bulk range of discharge for 5/10 kg extinguisher2 m

Operating temperature range-20 °C to +55 °C

Practical Notes

These extinguishers are specifically for Class D (metal) fires and should never be used on other fire classes, as it can be ineffective or dangerous.

The extinguishing agent is a special powder (e.g., Ternary Eutectic Chloride - TEC), which is different from common ABC or BC powders. Check the label carefully.

The extinguisher body is typically identified by a blue band over the standard red paint, as per IS 2190.