Method of Measurement of Building and Civil Engineering Works, Part XIX: Water Supply, Plumbing and Drains
1981 Edition

Under IS 1200 Part 19 (1981), pipes are classified primarily by their nominal diameter as defined in relevant Indian standards, material type such as GI, CI, or PVC, quality grade, and jointing technique including welded, socketed, or flanged connections. For fittings with differing diameters, classification is based on the largest diameter. Measurement is performed in running meters along the pipe's central axis between fittings. Joints and fittings are itemized and measured separately. Cutting pipes to fit joints is accounted for within the fitting or special item, not separately measured. This approach ensures uniformity and clarity in measuring pipeline components.

IS 1200 Part 19 includes measurements of standard pipe fittings like elbows, bends, tees, connectors, unions, and diminishing sockets. These fittings are enumerated separately but considered part of the pipe system. Drain pipes are measured by their length along the centerline, with joints and fittings itemized separately. Plumbing fixtures covered include various types of water closets (washdown, squatting, siphonic), wash basins, laboratory sinks, urinals, flushing cisterns, bath tubs, traps, shower roses, cast iron gratings, mixing valves, taps, brackets, supports, waste fittings, plugs, and related accessories. Each fixture and fitting is fully described and measured per item or unit, including fixing accessories where applicable.

Excavation and backfilling for pipeline trenches are measured based on IS 1200 Part 1 (1974) standards governing earthwork. Excavation volume is calculated in cubic meters as the product of trench length, width, and depth. Length is measured along the pipeline route, while width and depth conform to trench specifications for pipe installation. Refilling volume corresponds to the backfilled trench volume post pipe laying. Measurements are often staged into portions below and above the reference datum or ground level. Concrete beds and haunchings adjacent to pipes are measured separately in running meters, with specified dimensions and mix proportions. Pipes themselves are measured in running meters excluding fittings, which are measured distinctly.

Yes, according to IS 1200 Part 19 Clause 6.2.1, manholes and inspection chambers are measured and classified based on depth, defined as the vertical distance from the top of the manhole cover to the invert level of the main drain. Depth categories include ranges such as up to 0.5 meters, 0.5 to 1 meter, 1 to 2 meters, 2 to 3 meters, and beyond. This classification facilitates precise enumeration and estimation, reflecting the increased complexity and quantity of work associated with deeper installations.

Pipe insulation and coverings are measured in running meters for pipes, with the nominal diameter specified for clarity. For boilers, cylinders, and tanks, insulation is quantified in square meters representing surface area. There are no deductions made for manholes, hand holes, or pipes passing through insulation, nor is there additional measurement for finishing insulation around such openings. Insulation on bends, elbows, tees, valves, and similar fittings is measured separately as an extra quantity over the straight pipe runs. This ensures consistent and comprehensive measurement for insulation work.