The standard outlines specifications for plug cocks intended for water supply installations, focusing on sizes 15 mm, 20 mm, and 25 mm designed for underground applications with a maximum allowable working pressure of 1 MPa. It covers aspects such as design, material quality, dimensions, testing procedures, and marking requirements to ensure dependable shut-off functionality and compatibility with diverse piping systems. This document primarily benefits engineers, manufacturers, and quality inspectors in the water supply sector.
Overview
The standard outlines specifications for plug cocks intended for water supply installations, focusing on sizes 15 mm, 20 mm, and 25 mm designed for underground applications with a maximum allowable working pressure of 1 MPa. It covers aspects such as design, material quality, dimensions, testing procedures, and marking requirements to ensure dependable shut-off functionality and compatibility with diverse piping systems. This document primarily benefits engineers, manufacturers, and quality inspectors in the water supply sector.
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Frequently Asked
According to IS 3004 (1979), plug cock components must be made from specified materials to ensure quality and durability: the main bodies and parts are to be either Cast Brass Grade 3 (IS 292-1961) or Leaded Tin Bronze Grade 2 (IS 318-1962). Washers, plug nuts, union nuts, and tail pipes should be fabricated from brass rods compliant with standards for free cutting brass bars and rods. All materials must meet respective Indian Standards to guarantee corrosion resistance and mechanical integrity.
IS 3004 specifies plug cocks in nominal sizes of 15 mm, 20 mm, and 25 mm. The nominal size denotes the internal bore diameter of the end ports on the plug cock body, ensuring uniformity in sizing. These dimensions are detailed in Table I and Figure 1 of the standard, with provisions for standard commercial machining tolerances.
The standard identifies several pipe end connection types for plug cocks, including plain ends for lead (wiped) joints, socket ends for capillary solder joints, unions with tail pieces or tail pipes for lead or copper tube joints, and compression joint unions for copper tubes. Body ends must be precision machined or ground to ensure leak-tight joints, particularly for cone-type unions where washers or plastics are not permitted. Compatibility with mild steel tubing requires purchaser specifications.
Hydraulic testing as per IS 3004 mandates subjecting the plug cock body to a minimum pressure of 2 MPa and the seating area to at least 1 MPa, each maintained for a duration of not less than 2 minutes. The component must show no leaks or seepage during this period. Proper cleaning and minimal lubrication of seating surfaces are prerequisites to achieve accurate test results.
Each plug cock must be clearly marked with the manufacturer's name or trademark along with the nominal size designation. This marking facilitates product identification and traceability. Moreover, plug cocks undergo hydraulic pressure testing and dimensional verification to comply with the standard, ensuring quality assurance prior to certification.
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