Fabricated PVC-U Fittings for Potable Water Supplies - Specification, Part 5: Specific Requirements for Equal Tees

IS 10124 (Part 5): 2009 — Scope & Key Specifications

Scope Summary:

• Applies to dimensions and minimum wall thickness of steel pipes for various working pressures (Classes 2 to 6).
• Specifies nominal sizes, minimum wall thickness (t) for different pressure classes (0.4 to 1.25 MPa).
• Dimensions of fittings like equal tees must comply with Table 1 and Fig. 1.

Key Table Extract (Minimum Wall Thickness t in mm for Nominal Sizes)

Important Notes:

• Rounding off: Follow IS 2:1960 rules for

IS 10124 (Part 5): Key References, Dimensions & Wall Thickness

1. References (Table 2)

• IS 4985: 2000 — Unplasticized PVC pipes for potable water supplies.
• IS 10124 (Part 1): 2009 — Fabricated PVC-U fittings, General requirements.

2. Dimensions & Wall Thickness (Table 1 excerpt)

• B Min: Minimum dimension for equal tees (see Fig.1 in standard).
• Wall thickness varies with working pressure class (Class 2 to Class 6).

3. Rounding Off

IS 10124 Part 5 (2009) - Manufacture Key Points

1. Manufacture (Clause 3.2)

• Manufacturing process must comply with general requirements of IS 10124 Part 1 (Clause 3.1).
• Material, sizes, tests, sampling, and conformity criteria as per IS 10124 (Part 1).

2. Minimum Wall Thickness (Clause 1.25, Table 1)

• Wall thickness t depends on nominal size and working pressure class.
• Classes correspond to working pressures (MPa):

3. Rounding Off (Clause None)

• Final test or calculation

IS 10124 (Part 5) : 2009 - Dimensions of Equal Tees

Key Formulas & Specifications

• Dimension B (Min):
  [ B = 1.45 \times \text{Nominal Outside Diameter} + 6 \text{ mm} ]

• Wall Thickness (t):
  Calculated as 90% of the minimum wall thickness of the corresponding pipe size and pressure class, rounded up to next 0.1 mm.

Table 1: Dimensions of Equal Tees (B Min & Minimum Wall Thickness t in mm)

(Refer to the full Table 1 for all sizes)

Additional Notes

• Reducing Tees: Manufacturer can customize dimensions using Table 1 for main and reducing sizes.
• Socket Dimensions:
  • D = Mean socket internal diameter at mid-point (IS 10124 Part 1)
  • L =

IS 10124 Part 5: Marking of Equal Tees

Key Marking Requirements (Clause 4.1)

Each equal tee must be clearly and indelibly marked with:

• Manufacturer's name or identification mark
• Size of the equal tee and class (working pressure) as per IS 4985
• Colour code corresponding to the class as per the table below:

BIS Certification Marking (Clause 4.2)

• Equal tees may bear the BIS Standard Mark.
• Use of the Standard Mark is governed by the BIS Act, 1986 and related rules.

Additional Notes:

• D = mean socket internal diameter at mid-point of socket length (IS 10124 Part 1)
• L = minimum socket length (IS 10124 Part 1)

flowchart TD
    A[Equal Tee] --> B[Mark Manufacturer's Name]
    A --> C[Mark Size & Class per IS 4985]
    A --> D[Mark Colour as per Class]
    A --> E[Optional BIS Standard Mark]
    D --> F{Class}
    F -->|2 (0.4 MPa)| G[Blue]
    F -->|3 (0.6 MPa)| H[Green]
    F -->|4 (0.8 MPa)| I[Brown]
    F -->|5 (1.0 MPa)| J[Yellow]
    F -->|6 (1.25 MPa)| K[Black]

This ensures traceability, pressure rating identification, and compliance with BIS standards.

IS 10124 (Part 5) : 2009 - Pressure Classes & Wall Thickness for Equal Tees

Key Specifications:

• Pressure Classes (Working Pressure in MPa):

  • Class 2 = 0.4 MPa
  • Class 3 = 0.6 MPa
  • Class 4 = 0.8 MPa
  • Class 5 = 1.0 MPa
  • Class 6 = 1.25 MPa

• Minimum Wall Thickness (t) & Dimension B (Length):

  • B = 1.45 × Nominal Outside Diameter + 6 mm
  • Wall thickness for tees = 90% of pipe wall thickness for corresponding size & pressure class, rounded up to next 0.1 mm.

Sample Table Extract (Equal Tees):

Notes:

• Equal tees for 0.25 MPa must be made from 0.4 MPa class pipes.
• Reducing tees can be custom made using Table 1 dimensions for main and reducing sizes.

Formula Summary:

[ B = 1.45 \times D_{nominal} + 6 \text{ mm} ] [ t_{tee} = \text{ceil}\left(0.9 \times t_{pipe}\right) \text{ (to next 0.1 mm)} ]

This ensures structural integrity under specified pressure classes.

If you want, I can provide a Mermaid diagram illustrating the tee dimensions.

IS 10124 Part 5: Testing and Conformity - Key Points

• Rounding Off Rules (IS 2:1960):
  Final test or analysis results must be rounded off to the same number of significant digits as the specified value in the standard.

• General Requirements:
  Material properties, sizes, testing methods, sampling procedures, and conformity criteria follow IS 10124 Part 1.

• Testing & Conformity Principles:

  • Tests must be conducted as per specified methods in Part 1.
  • Sampling should be representative and follow statistical principles.
  • Conformity is decided based on test results compared against standard values, rounded per IS 2.

Summary Table: Testing & Conformity Reference

Practical Tip:

Always cross-check test results with specified values after rounding to avoid non-conformity due to minor decimal differences.

flowchart LR
    A[Test/Analysis Result] --> B[Rounding off as per IS 2]
    B --> C[Compare with Specified Value]
    C --> D{Pass or Fail?}
    D -->|Pass| E[Conformity Achieved]
    D -->|Fail| F[Reject or Retest]

This ensures consistent and standardized decision-making for product acceptance.

Use of Standard Mark as per IS 10124 Part 5

• Governing Law: The use of the Standard Mark is controlled by the Bureau of Indian Standards Act, 1986 and related rules (Clause 4.2.1).
• Licensing: Manufacturers must obtain a licence from BIS to use the Standard Mark.
• Marking on Products: Each equal tee can be marked with the Standard Mark (Clause 4.2).
• Rounding Off: Test results must be rounded off as per IS 2:1960 rules, retaining the same significant figures as specified (no clause number).
• Dimensional References:
  • ( D ) = Mean socket internal diameter at midpoint (from IS 10124 Part 1)
  • ( L ) = Minimum socket length (from IS 10124 Part 1)

Key Points for Compliance:

For detailed licensing conditions, contact BIS directly.

flowchart TD
    A[Manufacturer] --> B[Apply for BIS Licence]
    B --> C{Licence Granted?}
    C -->|Yes| D[Use Standard Mark on Product]
    C -->|No| E[No Marking Allowed]
    D --> F[Mark Equal Tees as per Clause 4.2]

This ensures compliance with BIS marking regulations and product standardization.

IS 10124 Part 5: General Requirements Summary

• Material, sizes, tests, sampling, and conformity: As per IS 10124 Part 1 (Clause 3.1).

• Caps specific requirements: Refer to Table 1 (Clause 1.25) for minimum wall thickness based on nominal size and working pressure class.

Key Table Extract (Minimum Wall Thickness t in mm for Caps)

Notes:

• B Min: Minimum dimension related to cap size.
• Thickness increases with working pressure class.

General Formula for Wall Thickness (approximation):

[ t = \frac{P \times D

IS 10124 Part 5 Key Specifications: Equal Tee Dimensions & Wall Thickness

Dimensions (Clause 3.2.2)

• Equal tees dimensions must follow Table 1 and Fig. 1.
• Key dimension: B Min (Minimum length of the branch).

Table 1 Extract: Minimum Wall Thickness (t) for Different Working Pressures (MPa)

Notes:

• B Min is the minimum length of the branch of the equal tee.
• Wall thickness t varies with working pressure class (Class 2 to Class