What is the accuracy requirement for these meters?

The maximum permissible error is ±2% in the upper flow range (Q2 to Q4) and ±5% in the lower flow range (Q1 to Q2), as per Table 3.

What is the maximum working pressure these meters can handle?

1.6 MPa for Class 1 meters and 1.0 MPa for Class 2 meters, as specified in Clause 6.3.

What are the standard nominal sizes covered by this code?

The standard covers meters with nominal sizes (DN) of 15, 20, 25, 40, and 50 mm (Clause 1.2).

What materials are permitted for the meter body?

The body can be made from cast iron (IS 210), brass/leaded tin bronze (IS 319), or suitable polymer materials (IS 13391), as per Clause 4.1.

IS 6784

: 2016

Water Meters (Multi-Jet Dry Dial Type) - Specification

CurrentFrequently UsedSpecificationBIMMEP · Plumbing Fixtures and Valves

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This standard specifies the requirements for multi-jet, dry dial type water meters used for measuring cold potable water. It covers materials, dimensions, construction, performance requirements like accuracy, and testing methods for meters of nominal sizes from 15 mm to 50 mm.

Specifies requirements for multi-jet dry dial type water meters for cold potable water.

Quick Reference Values

Maximum Permissible Error (Upper Flow Zone, Q2 to Q4)± 2 %

Maximum Permissible Error (Lower Flow Zone, Q1 to Q2)± 5 %

Maximum Admissible Working Pressure (Class 1)1.6 MPa

Maximum Admissible Working Pressure (Class 2)1.0 MPa

Maximum Admissible Water Temperature45 °C

Metrological Class CoveredClass B

Practical Notes

This standard primarily covers Metrological Class B meters. For higher accuracy (Class C), refer to manufacturer specifications which are often based on ISO 4064.

Ensure the meter is installed with sufficient straight lengths of pipe upstream and downstream as recommended by the manufacturer to maintain accuracy.

Always verify the ISI Mark on the product, which certifies its compliance with this standard.