The IS SP Part 57 (1993) serves as an extensive guide detailing specifications for pipes and fittings used in potable water distribution systems across India. It addresses aspects such as materials, handling, installation, jointing procedures, testing, corrosion control, and disinfection for various pipe types including cast iron, steel, PVC, and HDPE. This handbook is vital for professionals engaged in the design, construction, and upkeep of safe drinking water networks.
Overview
The IS SP Part 57 (1993) serves as an extensive guide detailing specifications for pipes and fittings used in potable water distribution systems across India. It addresses aspects such as materials, handling, installation, jointing procedures, testing, corrosion control, and disinfection for various pipe types including cast iron, steel, PVC, and HDPE. This handbook is vital for professionals engaged in the design, construction, and upkeep of safe drinking water networks.
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The handbook consolidates over 200 Indian Standards related to pipes and fittings suitable for drinking water systems. It recommends materials such as cast iron, steel, reinforced and prestressed concrete, asbestos cement, plastics, and clayware. Selection factors include durability, cost, ease of installation, adaptability to rural settings, water quality compatibility, and availability of skilled labor. Fittings conform to standards like IS 1538 covering various joints and valves. Third-party certification by BIS is emphasized to ensure quality.
Hydrostatic testing involves filling the pipeline or its sections with water and increasing pressure gradually at about 0.1 MPa per minute. The test pressure should be at least 1.2 times the maximum sustained operating or static pressure, including surge pressure if applicable. The pressure is maintained to allow for water absorption by materials, while monitoring water volume added over time. Pressure loss should be minimal, and leakage is not permitted. Proper disposal and treatment of test water, especially if chlorinated, must be ensured.
Ductile iron pipes should preferably be off-loaded using cranes with guide ropes, avoiding chain slings and slinging bundles directly. Cast iron pipes must never be thrown or dragged; timber skids and steadying ropes are recommended. Mild steel pipes require protection against distortion and coating damage using canvas or non-abrasive slings. Concrete pipes need to be lifted with slings around their circumference via cranes or chain blocks, avoiding bore or end hooks. Asbestos cement pipes weighing up to 60 kg can be handled manually, heavier ones require rope-assisted unloading on sloped planks. Plastic pipes must be securely loaded with side supports to prevent movement.
PVC pipes mostly use solvent cement welding where cleaned pipe ends and fittings are primed and cemented, then inserted and held until set. This method requires non-heat application and is preferred for water supply lines. HDPE pipes are joined by butt fusion welding using a heated mirror at 210 ± 5°C, applying contact pressure until a molten bead forms, then pressing the pipes together under welding pressure until cooled. Proper temperature control and pressure maintenance are critical to achieving full-strength welds.
Corrosion prevention includes selecting corrosion-resistant materials, applying organic coatings, employing cathodic protection methods like impressed current or sacrificial anodes, and using chemical inhibitors. Designing pipelines to avoid irregular profiles and facilitating maintenance is essential. For incrustation, controlling water quality to reduce mineral deposits and conducting periodic cleaning such as swabbing are advised. Maintenance of catch drains to prevent water accumulation also helps reduce corrosion risks.
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