IS 7834 Part 5 (1987) specifies the requirements for injection moulded PVC socket fittings with solvent cement joints specifically for 45-degree tees used in water supply systems. It covers manufacturing standards, dimensions, tolerances, and marking to ensure compatibility and reliability in plumbing applications. This standard is essential for manufacturers, engineers, and quality inspectors involved in PVC piping systems for potable water.
Overview
IS 7834 Part 5 (1987) specifies the requirements for injection moulded PVC socket fittings with solvent cement joints specifically for 45-degree tees used in water supply systems. It covers manufacturing standards, dimensions, tolerances, and marking to ensure compatibility and reliability in plumbing applications. This standard is essential for manufacturers, engineers, and quality inspectors involved in PVC piping systems for potable water.
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Contents
Structure
IS 7834 Part 5: Scope & Key Specifications for 45° Tees
Scope: Specifies requirements for manufacture, dimensions, tolerances, and marking of injection moulded PVC 45° tees for water supply systems.
General Requirements: Refer IS 7834 Part 1 for material, manufacturing, testing, sampling, and inspection protocols.
| Size (mm) | Z (mm) | Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 +2 / 0 -1 |
| 25 | 33 +3 | 7 +2 |
| 32 | 42 +4 / -3 | 8 +2 / -1 |
| 40 | 51 +5 / -3 | 10 +2 / 0 -1 |
| 50 | 63 +6 / -3 | 12 +2 / 1 |
| 63 | 79 +7 / -3 | 14 +2 / -1 |
| 75 | 94 +9 / -3 | 17 +2 / -1 |
| 90 | 112 +11 / -3 | 20 +3 / 1 |
| 110 | 137 +13 / -4 | 24 +8 / -1 |
| 125 | 157 +15 / -4 | 27 +3 / -1 |
| 140 | 175 +17 / -5 | 30 +4 / 1 |
| 160 | 200 +20 / -6 | 35 +4 |
flowchart LR
A[IS 7834 Part 5] --> B[Scope: 45° PVC Tees]
B --> C[Manufacture & Dimensions]
B --> D[Tolerances
IS 7834 Part 5: Key Requirements for 45° PVC Tees
| Size (mm) | Laying Length Z (mm) | Laying Length Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 +2 / 0 -1 |
| 25 | 33 +3 | 7 +2 |
| 32 | 42 +4 / 2 -3 | 8 +2 / -1 |
| 40 | 51 +5 / -3 | 10 +2 / 0 -1 |
| 50 | 63 +6 / -3 | 12 +2 / 1 |
| 63 | 79 +7 / -3 | 14 +2 / -1 |
| 75 | 94 +9 / -3 | 17 +2 / -1 |
| 90 | 112 +11 / 3 | 20 +3 / 1 |
| 110 | 137 -4 / +13 | 24 +8 / -1 |
| 125 | 157 +15 / 4 | 27 -1 / +3 |
| 140 | 175 +17 / 5 | 30 +4 / 1 |
| 160 | 200 -6 / +20 | 35 +4 |
Note: Higher sizes of 45° elbows are not recommended by ISO.
flowchart LR
A[PVC 45° Tee] --> B[Laying Length Z]
A --> C[Laying Length
IS 7834 Part 5: General Specifications for 45° Tees
Material & Manufacture:
Conform to IS 7834 Part 1 (1987) for general requirements including material quality, manufacturing, testing, sampling, and inspection.
Standard Marking:
Marking details are per Bureau of Indian Standards (BIS) guidelines (Clause 3.1).
45° Tee Dimensions (Laying Lengths):
| Size (mm) | Z (mm) | Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 + 2 / 0 - 1 |
| 25 | 33 + 3 | 7 + 2 |
| 32 | 42 + 4 | 8 + 2 / -1 |
| 40 | 51 + 5 | 10 + 2 / 0 - 1 |
| 50 | 63 + 6 / -3 | 12 + 2 / 1 |
| 63 | 79 + 7 / -3 | 14 + 2 / -1 |
| 75 | 94 + 9 / -3 | 17 + 2 / -1 |
| 90 | 112 + 11 / -3 | 20 + 3 / 1 |
| 110 | 137 - 4 / +13 | 24 + 8 / -1 |
| 125 | 157 + 15 / 4 | 27 - 1 / +3 |
| 140 | 175 + 17 | 30 + 4 / 1 |
| 160 | 200 - 6 / +20 | 35 + 4 |
graph TD
A[IS 7834 Part 5] --> B[Material & Manufacture per Part
IS 7834 Part 5: Manufacture of 45° PVC Tees
| Size (mm) | Z (mm) | Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 + 2 / 0 - 1 |
| 25 | 33 + 3 | 7 + 2 |
| 32 | 42 + 4 | 8 + 2 / -1 |
| 40 | 51 + 5 | 10 + 2 / 0-1 |
| 50 | 63 + 6 / -3 | 12 + 2 / 1 |
| 63 | 79 + 7 / -3 | 14 + 2 / -1 |
| 75 | 94 + 9 / -3 | 17 + 2 / -1 |
| 90 | 112 + 11 | 20 + 3 / 1 |
| 110 | 137 - 4 / +13 | 24 + 8 / -1 |
| 125 | 157 + 15 / 4 | 27 - 1 / +3 |
| 140 | 175 + 17 | 30 + 4 / 1 |
| 160 | 200 - 6 / +20 | 35 + 4 |
Note: Sizes above 160 mm for 45° elbows are not recommended by ISO.
graph LR
A[Pipe] --> B[45° Tee]
B --> C
IS 7834 (Part 5) - 1987: 45° Tee Key Specifications
| Size (mm) | Laying Length Z (mm) | Laying Length Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 + 2 / 0 - 1 |
| 25 | 33 + 3 | 7 + 2 |
| 32 | 42 + 4 / 2 - 3 | 8 + 2 / -1 |
| 40 | 51 + 5 / -3 | 10 + 2 / 0 - 1 |
| 50 | 63 + 6 / -3 | 12 + 2 / 1 |
| 63 | 79 + 7 / -3 | 14 + 2 / -1 |
| 75 | 94 + 9 / -3 | 17 + 2 / -1 |
| 90 | 112 + 11 / -3 | 20 + 3 / 1 |
| 110 | 137 - 4 / +13 | 24 + 8 / -1 |
| 125 | 157 + 15 / 4 | 27 - 1 / +3 |
| 140 | 175 + 17 / 5 | 30 + 4 / 1 |
| 160 | 200 - 6 / +20 | 35 + 4 |
flowchart TB
A[Main Pipe] -->|Laying Length Z
IS 7834 Part 5 (1987) — Dimensions and Tolerances for 45° Tees
| Size (mm) | Z (mm) | Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 +2 / 0 -1 |
| 25 | 33 +3 | 7 +2 |
| 32 | 42 +4 / 2 -3 | 8 +2 / -1 |
| 40 | 51 +5 / -3 | 10 +2 / 0 -1 |
| 50 | 63 +6 / -3 | 12 +2 / -1 |
| 63 | 79 +7 / -3 | 14 +2 / -1 |
| 75 | 94 +9 / -3 | 17 +2 / -1 |
| 90 | 112 +11 / -3 | 20 +3 / -1 |
| 110 | 137 +13 / -4 | 24 +8 / -1 |
| 125 | 157 +15 / +4 | 27 +3 / -1 |
| 140 | 175 +17 / +5 | 30 +4 / -1 |
| 160 | 200 +20 / -6 | 35 +4 |
graph TD
A[Main Pipe] -->|Length Z| B[Branch Pipe]
B -->|Length Z1| C[Socket]
style A fill:#f9f,stroke:#333,stroke-width:
IS 7834 Part 5 (1987) - Socket Inside Diameter and Length for 45° Tees
| Size (mm) | Laying Length Z (mm) | Socket Length Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 +2 / 0 -1 |
| 25 | 33 + 3 | 7 +2 |
| 32 | 42 + 4 / 2 -3 | 8 +2 / -1 |
| 40 | 51 + 5 / -3 | 10 +2 / 0 -1 |
| 50 | 63 + 6 / -3 | 12 +2 / 1 |
| 63 | 79 + 7 / -3 | 14 +2 / -1 |
| 75 | 94 + 9 / -3 | 17 +2 / -1 |
| 90 | 112 + 11 / -3 | 20 +3 / 1 |
| 110 | 137 - 4 / +13 | 24 +8 / -1 |
| 125 | 157 + 15 / 4 | 27 -1 / +3 |
| 140 | 175 + 17 / 5 | 30 +4 / 1 |
| 160 | 200 - 6 / +20 | 35 +4 |
flowchart LR
A[45° Tee Socket] --> B[Inside Diameter]
A --> C[Socket Length]
B & C --> D[Conform to IS 783
IS 7834 Part 5 — Marking for 45° Tee PVC Socket Fittings
Each 45° tee fitting shall be marked with:
| Size (mm) | Z (mm) | Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 + 2 / 0 - 1 |
| 25 | 33 + 3 | 7 + 2 |
| 32 | 42 + 4 / 2 - 3 | 8 + 2 / -1 |
| 40 | 51 + 5 / -3 | 10 + 2 / 0 - 1 |
| 50 | 63 + 6 / -3 | 12 + 2 / 1 |
| 63 | 79 + 7 / -3 | 14 + 2 / -1 |
| 75 | 94 + 9 / -3 | 17 + 2 / -1 |
| 90 | 112 + 11 / -3 | 20 + 3 / 1 |
| 110 | 137 - 4 / +13 | 24 + 8 / -1 |
| 125 | 157 + 15 / 4 | 27 - 1 / +3 |
| 140 | 175 + 17 / 5 | 30 + 4 / 1 |
| 160 | 200 - 6 / +20 | 35 + 4 |
Note: Higher sizes of 45° elbows are not recommended.
graph TD
A[Fitting Marking] --> B[Manufacturer's Name
IS 7834 Part 5: Standard Marking Details for 45° PVC Tees
| Size (mm) | Z (mm) | Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 + 2 / 0 - 1 |
| 25 | 33 + 3 | 7 + 2 |
| 32 | 42 + 4 / 2 - 3 | 8 + 2 / -1 |
| 40 | 51 + 5 / -3 | 10 + 2 / 0 - 1 |
| 50 | 63 + 6 / -3 | 12 + 2 / 1 |
| 63 | 79 + 7 / -3 | 14 + 2 / -1 |
| 75 | 94 + 9 / -3 | 17 + 2 / -1 |
| 90 | 112 + 11 / -3 | 20 + 3 / 1 |
| 110 | 137 - 4 / +13 | 24 + 8 / -1 |
| 125 | 157 + 15 / 4 | 27 - 1 / +3 |
| 140 | 175 + 17 / 5 | 30 + 4 / 1 |
| 160 | 200 - 6 / +20 | 35 + 4 |
Note: Higher sizes of 45° elbows are not recommended as per ISO.
flowchart LR
A[45° Tee Fitting] --> B{Marking}
B --> C[Manufacturer's Name/
Frequently Asked
Under IS 7834 Part 5 (1987), the dimensional tolerances for 45° tees (injection moulded PVC socket fittings) are specified mainly for two key dimensions: Z (laying length) and Z1.
| Size (mm) | Z (mm) Tolerance | Z1 (mm) Tolerance |
|---|---|---|
| 20 | 27 ± 3 | 6 +2 / 0 -1 |
| 25 | 33 +3 | 7 +2 |
| 32 | 42 +4 / -3 | 8 +2 / -1 |
| 40 | 51 +5 / -3 | 10 +2 / 0 -1 |
| 50 | 63 +6 / -3 | 12 +2 / +1 |
| 63 | 79 +7 / -3 | 14 +2 / -1 |
| 75 | 94 +9 / -3 | 17 +2 / -1 |
| 90 | 112 +11 / -3 | 20 +3 / +1 |
This ensures proper fitment and pressure rating compliance for water supply PVC tees.
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For exact tolerances on all sizes, refer to the detailed table in Clause 2.2.2 of IS 7834 Part 5.
According to IS 7834 Part 5 (1987), the materials and manufacturing processes for injection moulded PVC 45° tees for water supplies must:
| Aspect | Requirement |
|---|---|
| Material | PVC as per IS 7834 Part 1 |
| Manufacturing | Injection moulding |
| Joint Type | Solvent cement joints |
| Testing & Inspection | Per IS 7834 Part 1 |
| Dimensions | As per Part 5 tables (e.g., laying length) |
This ensures uniform quality and compatibility for water supply PVC fittings.
According to IS 7834 Part 5 (1987), marking of 45° tees should include:
| Marking Details | Description |
|---|---|
| Manufacturer's Identification | Name or mark for traceability |
| Size | Nominal size in mm |
| Pressure Class | Working pressure class rating |
This ensures uniformity and traceability in manufacturing and installation.
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This marking practice aids quality control and proper identification on site.
Applicable Pressure Classes for IS 7834 Part 5 (45° PVC Tees):
| Parameter | Details |
|---|---|
| Pressure Classes | Usually 6, 10, 16 bar (verify marking) |
| Marking Requirement | Manufacturer's name, size, pressure class |
| Reference for Pressure Classes | IS 7834 Part 1 (General requirements) |
For design and selection, always confirm the pressure class marked on the fitting and ensure compatibility with system pressure.
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Note: Verify pressure class with manufacturer and IS 7834 Part 1 for precise ratings.
IS 7834 Part 5 (1987) on 45° Tees: Size Limitations & Recommendations
| Size (mm) | Z (mm) | Z1 (mm) |
|---|---|---|
| 20 | 27 ± 3 | 6 + 2 (0 - 1) |
| 50 | 63 + 6 - 3 | 12 + 2 1 |
| 90 | 112 + 11 3 | 20 + 3 1 |
| 160 | 200 - 6 + 20 | 35 + 4 |
Summary:
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This ensures compliance with IS 7834 Part 5 for safe and standardized 45° tee fittings.
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