IS 2692:1989 outlines the specifications for copper alloy screw-down ferrules intended for water supply mains. It defines their sizes, materials, design features, dimensions, and testing protocols to ensure secure and leak-resistant branch connections in water distribution networks.
Overview
IS 2692:1989 outlines the specifications for copper alloy screw-down ferrules intended for water supply mains. It defines their sizes, materials, design features, dimensions, and testing protocols to ensure secure and leak-resistant branch connections in water distribution networks.
Audience
Contents
Structure
This section covers the application scope of the ferrules standard, including nominal sizes ranging from 10 mm to 50 mm, and details the dimensions, markings, and permissible tolerances for ferrule components such as plugs, washer plates, and washers. It also addresses thread tolerances and provides tables summarizing critical size parameters and typical ferrule lengths for T-branch connections.
Lists the essential Indian Standards referenced within IS 2692 related to materials, threads, washers, and sampling procedures, such as IS 318, IS 319, IS 320, IS 554, IS 1264, IS 3487, IS 4218, IS 4346, IS 4905, and IS 6912, ensuring material compatibility and standardization.
Defines key ferrule components like body, plug, cap, washer plate, nut, resilient washer, copper washer, and key. Specifies material grades for each component, including leaded tin bronze, brass types, leather, vulcanized fibre, rubber, and copper, along with key dimensions and fabrication details for the T-shaped operating key.
Details nominal bore sizes for inlet connections and corresponding dimensions for ferrule bodies and caps. Includes maximum and minimum bore diameters, thread sizes, and lengths as well as thicknesses and heights of seating areas for nominal sizes from 8 mm to 50 mm.
Summarizes the materials used for ferrule components based on Indian Standards. Describes the composition and grades of metals and resilient washers, along with fabrication requirements for keys including dimensions and shapes.
Provides detailed dimension tables for ferrule bodies, caps, plugs, washer plates, and washers, specifying limits for bore sizes, thread dimensions, and thicknesses across nominal sizes.
Outlines manufacturing standards such as defect-free castings, surface finish quality, dimensional accuracy, thread tolerance levels, and proper fitment of washers. Emphasizes inspection procedures and marking requirements for traceability.
Details design requirements for ferrule components, including material specifications, dimensional criteria, thread standards, and key design features to ensure functional integrity and ease of operation.
Describes the lot-wise sampling procedure, specifying sample sizes and acceptable defect limits based on lot quantity. Explains testing steps and criteria for acceptance or rejection of ferrule batches.
Specifies the hydraulic test requirements including minimum pressure (1.5 MPa), test duration (2 minutes), and acceptance criteria (no leakage or sweating). Details sample selection from compliant ferrules and outlines the testing process.
Sets guidelines for marking each ferrule with manufacturer identification and nominal size to ensure traceability and compliance, supported by dimensional references from the standard.
Provides a comprehensive list of all Indian Standards referenced in IS 2692, including those related to materials, threads, washers, and sampling, ensuring harmonization with other standards.
Explains detailed sampling plans and acceptance criteria for ferrule lots, including sample sizes, allowable defectives, and sub-sample testing, along with a procedural flowchart for quality assurance.
Frequently Asked
IS 2692:1989 specifies that ferrule components such as the body, plug, and cap are to be made from leaded tin bronze complying with IS 318:1981 (Grade LTB 2). Washer plates and nuts use brass of specified grades per IS 319:1974 and IS 1264:1989. Resilient washers can be leather, vulcanized fibre, or rubber per IS 4346:1982, while copper washers conform to IS 3487:1966. The operating key is fabricated from malleable cast or forged mild steel as detailed in the standard.
The standard covers nominal bore sizes of 8, 10, 15, 20, 25, 32, 40, and 50 millimeters for water service ferrules. These sizes refer to the nominal bore of the inlet connection and are detailed in Clause 4.1 and 4.1.1 of IS 2692.
Per IS 2692, hydraulic pressure testing involves applying a minimum pressure of 1.5 MPa (15 bar) to selected ferrule samples for a duration of two minutes. The ferrules must show no signs of leakage or sweating throughout the test. Samples are chosen from ferrules that have passed initial inspections, with acceptance contingent on zero failures within the tested batch.
The manufacturing process must produce castings free from defects like laps, blowholes, and pitting, with clean and smooth surfaces. Dimensions must adhere strictly to Tables 2 and 3. Threads require medium class bolt/nut tolerances, and washer plates must fit smoothly into plugs. Marking of each ferrule with manufacturer identity and nominal size is mandatory to assure traceability and quality.
Ferrules are sampled by lot, where each lot comprises items of the same material, size, and batch. Random samples are selected as per IS 4905:1968. Initial examinations check material, workmanship, finish, dimensions, and mass. A sub-sample passing these checks undergoes hydraulic pressure testing. Acceptance depends on defect counts within permissible limits as outlined in Table 4 of IS 2692.
Ask AI about any clause, requirement, or provision in IS 2692. Get instant, clause-cited responses powered by our indexed library.
Free tier includes 150 queries (50 AI + 100 Reference) · No credit card required