The IS 7834 Part 2 (1987) standard outlines the specifications for injection moulded PVC socket fittings, focusing on 45-degree elbow joints utilized in potable water distribution systems. It details manufacturing criteria, dimensional tolerances, and marking protocols to guarantee proper compatibility and functionality in plumbing installations. This standard is vital for manufacturers, design engineers, and quality assurance personnel working with PVC piping networks.
Overview
The IS 7834 Part 2 (1987) standard outlines the specifications for injection moulded PVC socket fittings, focusing on 45-degree elbow joints utilized in potable water distribution systems. It details manufacturing criteria, dimensional tolerances, and marking protocols to guarantee proper compatibility and functionality in plumbing installations. This standard is vital for manufacturers, design engineers, and quality assurance personnel working with PVC piping networks.
Audience
Contents
Structure
This section defines the scope covering injection moulded PVC 45° elbow fittings for water supply pipelines. It sets forth manufacturing parameters, dimensional requirements, tolerance limits, and marking criteria. The laying length (Z) is specified for each nominal pipe size, with precise tolerance values to ensure proper fitting and function. Compliance with BIS marking regulations is mandatory.
This chapter presents the critical specifications including laying length dimensions with tolerances, manufacturing controls, and conformity to marking standards. It emphasizes maintaining dimensional accuracy to guarantee joint integrity and system performance in potable water applications.
Outlines the fundamental laying length measurements and tolerance ranges for 45° elbow fittings. Specifies the requirement for product marking adhering to BIS standards and references applicable manufacturing guidelines.
Focuses on production standards ensuring dimensional precision and adherence to tolerance limits for 45° elbows. Highlights the importance of consistent manufacturing processes and standard marking for traceability.
Provides a schematic representation of the 45° elbow design and lists the laying length dimensions by pipe size. Socket dimensions must align with Part 1 standards. Marking requirements include manufacturer identification, size, and pressure class.
Defines the laying length (Z) values for 45° elbow fittings with corresponding tolerance margins. This length is measured from the pipe end to the tangent point on the elbow, ensuring manufacturing accuracy for installation.
Specifies that the internal diameter and length of the socket comply with IS 7834 Part 1. Details marking requirements including manufacturer details, fitting size, and pressure rating for easy identification.
Describes the mandatory markings on each 45° elbow fitting, including manufacturer’s name or mark, nominal size, and pressure classification. These markings facilitate traceability and confirm compliance with pressure standards.
Frequently Asked
IS 7834 Part 2 (1987) defines specific dimensional tolerances for the laying length (Z) of 45° PVC elbow fittings as follows (in millimeters):
| Nominal Size | Laying Length Z | Tolerance |
|---|---|---|
| 16 | 4.5 | ±1 |
| 20 | 5 | ±1 |
| 25 | 6 | +1 / -1 |
| 32 | 7.5 | +1.6 / -1 |
| 40 | 9.5 | +2 / -1 |
| 50 | 11.5 | +2.5 / -1 |
| 63 | 14 | +3.2 / -1 |
| 75 | 16.5 | +4 / -1 |
| 90 | 19.5 | +5 / -1 |
| 110 | 23.5 | +6 / -1 |
| 125 | 27 | +6 / -1 |
| 140 | 30 | +7 / -1 |
| 160 | 34 | +8 / -1 |
| 180 | 38 | +8 / -1 |
| 200 | 43 | +9 / -1 |
| 225 | 48 | +10 / -1 |
| 250 | 53 | +11 / -1 |
| 280 | 60 | +12 / -1 |
| 315 | 67 | +13 / -1 |
These tolerances ensure accurate fitting dimensions to maintain proper joint function and system integrity in water supply pipelines.
The standard covers injection moulded PVC 45° elbow fittings for water supply systems ranging in nominal sizes from 16 mm up to 315 mm. For each size, specific laying length (Z) values and tolerances are provided to ensure proper fitment. Socket dimensions such as inside diameter and length must conform to IS 7834 Part 1. Markings on these fittings include manufacturer identification, fitting size, and pressure rating class.
According to Clause 3 of IS 7834 Part 2 (1987), every 45° elbow fitting must bear clear markings that include:
These markings facilitate product traceability and confirm compliance with pressure requirements for safe use in potable water systems.
IS 7834 Part 2 complements the general requirements outlined in IS 7834 Part 1 by focusing specifically on 45° injection moulded PVC elbow fittings with solvent cement joints. While Part 1 covers broad material, manufacturing, testing, sampling, and inspection criteria for all PVC socket fittings, Part 2 provides detailed dimensioning, tolerance, and marking requirements unique to 45° elbows. All material and quality standards in Part 2 must conform to those established in Part 1, effectively making Part 2 a specialized extension of the general framework.
Yes, the fittings covered under IS 7834 Part 2 are specifically designed as injection moulded PVC socket fittings compatible with solvent cement joints. This compatibility ensures a strong chemical bond creating leak-proof connections suitable for potable water supply systems. The standard mandates that all materials, manufacturing processes, and testing conform to IS 7834 Part 1, which governs general requirements for solvent cement joint fittings. Thus, these 45° elbows are reliable and standardized for use in water distribution pipelines.
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