The IS 910:1980 standard defines specifications for combined keys used to operate fire hydrants, hydrant covers, and lower valves. It outlines material requirements, dimensions, markings, and finishing to guarantee safety, durability, and compatibility across fire safety equipment. This specification is crucial for stakeholders involved in the production, supply, and maintenance of firefighting apparatus.
Overview
The IS 910:1980 standard defines specifications for combined keys used to operate fire hydrants, hydrant covers, and lower valves. It outlines material requirements, dimensions, markings, and finishing to guarantee safety, durability, and compatibility across fire safety equipment. This specification is crucial for stakeholders involved in the production, supply, and maintenance of firefighting apparatus.
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Contents
Structure
IS 910 specifies combined keys designed for use with hydrants, hydrant covers, and lower valves in firefighting applications. It includes two key designs illustrated in Figures 1 and 2, with all measurements provided in millimeters. When tolerances are not explicitly stated, nominal dimensions apply with permissible deviations as per IS 2102 (Part 1) - 1980, which covers general linear and angular tolerances. The standard emphasizes the use of the Standard Mark under BIS Act, 1986 regulations, ensuring the uniformity and interchangeability of these keys throughout India. Key dimensions include a bar width of 18 mm and features such as a flat end and an eye for bar handling, as depicted in the figures.
This section details related standards referenced by IS 910:1980, including the BIS Act 1986 governing the use of the Standard Mark and licensing procedures. It covers the dimensional and tolerance requirements for the two key designs (Figures 1 & 2) with measurements in millimeters and tolerance adherence to IS 2102 (Part 1) - 1980. Material and finishing details specify the use of ready-mixed, bituminous, lead-free black paint conforming to IS 158:1968 standards. It also provides contact information for BIS central and regional offices for inquiries related to licensing and standard compliance.
This part describes the shape and size parameters of combined keys as per IS 910, with dimensions given in millimeters in Figures 1 and 2. The keys’ overall length is 180 mm, with a bar width of 18 mm and an eye diameter approximately 13 mm, terminating in a flat end. Dimensions not marked with specific tolerances default to nominal values controlled by IS 2102 (Part 1) - 1980. Material specifications require cast steel compliant with IS 1030-1982, and pipe portions must follow IS 1239 (Part I) - 1979.
Combined keys should be free from burrs and sharp edges to ensure safe handling and proper assembly. The surface must be coated with two layers of anti-corrosive black paint as per IS 158:1968, which specifies ready-mixed, brushing application, bituminous, lead-free paint resistant to acids, alkalis, water, and heat. These finishing requirements help protect the key against environmental degradation and maintain operational integrity.
Each combined key must bear permanent and legible markings including the manufacturer's name or trademark, the type of key, and the year of manufacture. Optionally, the Standard Mark may be applied following BIS licensing under the Bureau of Indian Standards Act, 1986. Such markings facilitate traceability, compliance verification, and easier maintenance inspections throughout the key’s service life.
Dimensional accuracy for combined keys adheres to the parameters shown in Figures 1 and 2, with unspecified tolerances governed by IS 2102 (Part 1) - 1980, which prescribes general tolerances for linear and angular measurements. Typical linear tolerances range from ±0.1 mm for dimensions up to 10 mm, scaling up to ±0.8 mm for sizes up to 1000 mm. Angular tolerances vary between ±0.5° and ±2°. Material requirements specify cast steel per IS 1030-1982 and mild steel tubes according to IS 1239 (Part I) - 1979.
Quality assurance for combined keys involves verifying dimensional tolerances in accordance with IS 2102 (Part 1)-1980 and ensuring compliance with marking and licensing requirements under the BIS Act, 1986. Test results must be rounded according to IS 2-1960 guidelines to maintain consistency. The two key designs specified in IS 910 are subject to inspection against their detailed dimensional drawings and tolerance limits to confirm conformity.
The application of the Standard Mark on combined keys is regulated by the Bureau of Indian Standards Act, 1986. Manufacturers must obtain appropriate licenses by fulfilling BIS conditions. The keys must be visibly marked with the manufacturer’s identification, key type, manufacturing year, and optionally the Standard Mark. Contact details for BIS central, regional, and branch offices are provided for licensing assistance and further information.
Frequently Asked
IS 910:1980 recommends manufacturing combined keys primarily from mild steel or cast steel due to their strength and durability suitable for firefighting operations. The material must possess the necessary mechanical properties to endure operational stresses and environmental exposure. Additionally, surface treatments such as painting or galvanizing are advised to prevent corrosion. For detailed mechanical and chemical specifications, relevant standards like IS 2062 for mild steel should be consulted.
The combined key’s shape and dimensions are defined by two designs illustrated in Figures 1 and 2 of IS 910:1980. For any dimension lacking explicit tolerance, IS 2102 (Part 1)-1980 provides applicable linear and angular tolerance limits. The key must be free of burrs and sharp edges and coated with two layers of anti-corrosive black paint per IS 158-1968. These requirements ensure proper fit, function, and durability.
Per Clause 5.1 of IS 910, each combined key must be permanently and clearly marked with the manufacturer's name or trademark, the type of key, and the year of manufacture. Optionally, the Standard Mark may also be affixed according to BIS regulations. These markings aid in traceability, compliance verification, and maintenance. The marking should be durable enough to withstand wear and corrosion over the key’s service life.
IS 910:1980 specifies that the combined key must be free from burrs and sharp edges and receive two coats of anti-corrosive black paint conforming to IS 158:1968. This coating is designed to resist acids, alkalis, water, and heat, thereby safeguarding the steel key against environmental corrosion and extending its service life.
Yes, IS 910:1980 includes two alternative combined key designs, as illustrated in Figures 1 and 2. Both designs comply with the same material, dimensional, and functional requirements, allowing manufacturers flexibility while ensuring standardization and interchangeability within fire safety equipment.
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