The standard outlines the specifications for washers employed in water fittings intended for firefighting applications across India. It details the dimensions, materials, craftsmanship, and labeling of two washer categories (Type A and Type B) to guarantee effective sealing and durability under firefighting conditions. This specification is vital for producers, suppliers, and engineers engaged in fire safety systems to ensure the compatibility and reliability of washers in firefighting water fittings.
نظرة عامة
The standard outlines the specifications for washers employed in water fittings intended for firefighting applications across India. It details the dimensions, materials, craftsmanship, and labeling of two washer categories (Type A and Type B) to guarantee effective sealing and durability under firefighting conditions. This specification is vital for producers, suppliers, and engineers engaged in fire safety systems to ensure the compatibility and reliability of washers in firefighting water fittings.
الجمهور
المحتويات
الهيكل
الأسئلة المتكررة
The standard specifies exact dimensions for both Type A and Type B washers. For example, Type A washers with a nominal size of 63 mm have an outer diameter (Dia A) of 78 mm (+0/-1 mm), an inner diameter (Dia B) of 63 mm (+1/-0 mm), and a thickness (C) of 11.0 mm (±0.5 mm), commonly used in female couplings. Type B washers are subdivided into subtypes I, II, and III with sizes ranging from 63 mm to 140 mm nominal sizes and thicknesses between 3.0 mm and 6.0 mm, applied in branch pipes, suction hose couplings, and strainers. For detailed tables and figures, refer to the standard’s specifications.
Although the standard primarily highlights rubber as the material with specific hardness and chemical resistance, approved materials for washers include rubber complying with the specified quality standards and vegetable tanned hydraulic leather. Metallic materials such as brass or stainless steel are typically used in practice for durability, although not explicitly stated in the provided clauses. Compliance with the ISI certification mark ensures adherence to material and quality standards. For precise grades and further details, consult the complete standard and related Indian Standards for rubber and leather.
According to the standard, each washer must be permanently and clearly labeled with the manufacturer's name or trademark, the washer type, and the year of manufacture. Additionally, washers may bear the ISI certification mark, indicating conformity with quality and inspection criteria under ISI supervision. This marking facilitates traceability, quality assurance, and compliance verification during inspections.
Rubber washers must meet the hardness criteria detailed as Type 3 in IS 5382:1985. They should demonstrate resistance to acidic and alkaline environments, withstanding immersion for 30 minutes in 20% sulfuric acid and 5% sodium hydroxide solutions without exhibiting corrosion or damage. These requirements ensure the washers’ durability and suitability for use in firefighting water fittings.
Yes, washers manufactured according to this standard can be used with all firefighting water fittings, provided that the washer’s nominal size corresponds exactly to the nominal size of the fitting. This ensures proper sealing and compatibility within firefighting water systems, maintaining system integrity and performance.
اسأل AI عن أي بند، متطلب، أو حكم في IS 937. احصل على ردود فورية مع الاستشهاد بالبند مدعومة بمكتبتنا المفهرسة.
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