IS 2556:1982 Part 1 is the Indian Standard (BIS) for general requirements for water meters - part 1: cold water meters (rotary piston type). Specifies the general requirements, quality of materials, dimensional tolerances, and inspection criteria for vitreous china sanitary appliances used in plumbing and sanitation.
Specifies general requirements for cold water meters of the rotary piston type for domestic and industrial use.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
| Parameter | IS Value | International | Source |
|---|---|---|---|
| MPE (Lower Flow Zone) | ±5% (from Qmin up to, but excluding, Qt) | ±5% (from Q1 up to, but excluding, Q2) | ISO 4064-1:2014 |
| MPE (Upper Flow Zone) | ±2% (from Qt up to and including Qmax) | ±2% (from Q2 up to and including Q4) | ISO 4064-1:2014 |
| Maximum Admissible Pressure | 1.0 MPa (10 kgf/cm²) | Specified as MAP 10 (1.0 MPa) or MAP 16 (1.6 MPa) | OIML R 49-1:2013 |
| Maximum Admissible Temperature | 45 °C | Defined by Temperature Class, e.g., T30 (30 °C) or T50 (50 °C) | ISO 4064-1:2014 |
| Pressure Loss | Shall not exceed 0.025 MPa at Qmax | Classified by Δp class, e.g., Δp 25 (0.025 MPa) or Δp 63 (0.063 MPa) at Q3 | ISO 4064-1:2014 |
| Body Hydrostatic Pressure Test | 1.6 MPa for 15 minutes | 1.6 x MAP (e.g., 1.6 x 1.0 = 1.6 MPa) for 15 minutes | OIML R 49-1:2013 |
| Metrological Classification | Class A, B, C (based on Qmin/Qn) | Ratio 'R' = Q3/Q1 (e.g., R100, R160, R250, R400) | ISO 4064-1:2014 |