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IS 907:1984 is the Indian Standard (BIS) for suction strainers, cylindrical type for fire fighting purposes. This standard specifies the requirements for materials, dimensions, workmanship, and testing of cylindrical suction strainers used in fire fighting. Engineers use this code to procure and inspect strainers attached to suction hoses, which prevent debris from entering and damaging fire pumps during open-water drafting operations.
Specification for Suction Strainers, Cylindrical Type For Fire Fighting Purposes
Consolidated list per BIS. For the text of each amendment, refer to the BIS portal link above.
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International Equivalents
Similar International Standards
NFPA 1964:2023National Fire Protection Association, USA
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BS 336:2010British Standards Institution, UK
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NFPA 1901:2016National Fire Protection Association, USA
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EN 1028-1:2002+A1:2008European Committee for Standardization, Europe
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Details requirements for fire pumps and their accessories, including suction inlet strainers.
Key Differences
≠IS 907 is highly prescriptive about materials (e.g., Gunmetal LTB2 of IS 318), whereas standards like NFPA 1964 are performance-based, requiring 'corrosion-resistant materials' that meet durability tests.
≠The required total area of perforations in IS 907 is at least 1.5 times the waterway area, which is less than the typical requirement in international standards (e.g., BS 336 requires >= 2.0 times the bore area).
≠Hose coupling threads are not interchangeable. IS 907 specifies IS 902 round threads, while NFPA standards mandate NFPA 1963 (e.g., NST) threads, and BS 336 requires its own standard round thread.
≠NFPA 1964 includes dynamic performance tests like a drop test and operational torque tests on connections, which are absent in the static testing requirements of IS 907:1984.
Key Similarities
≈All standards define a device with the same fundamental purpose: to prevent debris from entering and damaging a fire pump or blocking a hose line via the suction hose.
≈The basic construction is universally similar, comprising a perforated basket/cage, a bottom plate to prevent sucking from the bed of the water source, and a threaded inlet for connection to a suction hose.
≈All standards mandate a hydrostatic pressure test to verify the structural integrity of the strainer body and its threaded connection, ensuring it can withstand operational pressures without leakage or failure.
≈The design in all standards incorporates lugs or an eyelet for attaching a rope, which is essential for lowering, positioning, and retrieving the strainer from a static water source like a pond or river.
Parameter Comparison
Parameter
IS Value
International
Source
Perforated Area Ratio (to inlet)
≥ 1.5 times the area of the waterway
≥ 2.0 times the nominal bore area
BS 336:2010
Hydrostatic Test Pressure
2.1 MPa (21.4 kgf/cm²) for 2.5 min
20 bar (2.0 MPa) for 1 min
BS 336:2010
Standard Hose Thread
IS 902 Male Round Thread
NFPA 1963 compliant threads (e.g., NST)
NFPA 1964:2023
Material Specification (Body)
Prescriptive: Gunmetal (IS 318 LTB2) or Aluminium Alloy (IS 617 Gr 4600)
What are the standard sizes for cylindrical suction strainers covered by IS 907?+
The standard sizes are 75 mm, 100 mm, and 140 mm.
What is the primary function of these strainers?+
They are fitted to the inlet end of a suction hose to prevent leaves, gravel, and other debris from entering the fire pump when drawing water from static sources.
What is the hydraulic testing requirement?+
The strainer assembly must withstand a hydrostatic pressure of 1.0 MN/m2 (10 kgf/cm2) for at least 2 minutes without leakage or failure.