Fabricated PVC- U Fittings for Potable Water Supplies - Specification, Part 4: Specific Requirements for Caps

IS 10124 Part 4: Scope - Key Specifications and Dimensions for Caps

Scope Summary:

• Applies to PVC caps for pipes with pressure classes 0.6 MPa and above.
• Caps for 0.25 MPa and 0.4 MPa pressure classes must be made from 0.6 MPa pressure class pipes.
• Dimensions and wall thicknesses are specified to ensure pressure integrity.

Key Parameters:

• D = Mean socket internal diameter (from IS 10124 Part 1)
• L = Effective minimum socket length
• t = Minimum wall thickness of caps = 90% of pipe wall thickness, rounded up to next 0.1 mm

Table 1: Minimum Wall Thickness (t) for Caps (mm)

(Refer to full table for intermediate sizes)

Notes:

• Wall thickness t is based on 90% of pipe wall thickness for the corresponding pressure class.
• Dimensions must comply with Table 1 and Fig. 1 (not included here).
• Rounding off follows IS 2:1960 rules.

flowchart LR
    A[Pipe Size & Pressure Class] --> B[Determine Pipe Wall Thickness]
    B --> C[Calculate Cap Wall Thickness t = 0.9 × Pipe Thickness]
    C --> D[Round t to next 0.1 mm

Key References (IS 10124 Part 4)

• Referenced Standards:

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

• Rounding Off Rule:

  • Follow IS 2:1960 for rounding numerical test results.
  • Retain same significant figures as specified values.

Dimensions of Caps (Clause 3.2.2 & Table 1)

• Caps must meet dimensions in Table 1 and Fig. 1.
• Caps for 0.25 & 0.4 MPa pressure classes should be made from 0.6 MPa class pipes.
• Wall thickness ( t ) is based on 90% of minimum pipe wall thickness, rounded up to next 0.1 mm.

(Refer to full table for all sizes)

Important Parameters:

• ( D ) = Mean socket internal diameter (from IS 10124 Part 1)
• ( L ) = Effective minimum socket length
• ( t ) = Minimum wall

IS 10124 Part 4 (2009) — Manufacture of Caps: Key Specifications

1. Definitions and Parameters (Clause 3.2)

• D = Mean socket internal diameter at mid-point of socket length (per IS 10124 Part 1)
• L = Effective minimum socket length
• t = Minimum wall thickness of caps, calculated as 90% of the minimum wall thickness of the corresponding pipe size and pressure class, rounded to next 0.1 mm.

2. Material & Welding

• Caps are made from PVC, welded by solvent or welding rod.
• May include fiberglass reinforcement.

3. Minimum Wall Thickness (t) for Caps (Table 1)

(Refer to full Table 1 for all sizes)

4. Rounding Off (Clause 3.2 Note)

• Wall thickness and test results rounded per IS 2:1960 rules, maintaining significant figures.

Summary:

• Caps must have minimum wall thickness t = 0.9 × pipe wall thickness, rounded up.
• Dimensions and materials per IS 10124 Part 1.
• Use Table 1 for thickness based on nominal size and pressure class.

IS 10124 Part 4: General Requirements Summary

• Materials, sizes, tests, sampling, and conformity criteria must comply with IS 10124 (Part 1).
• Referenced standards for PVC-U fittings and pipes:
  • IS 4985:2000 — Unplasticized PVC pipes for potable water.
  • IS 10124 (Part 1):2009 — Fabricated PVC-U fittings general requirements.

Key Points from IS 10124 (Part 1) General Requirements:

• Material: PVC-U (Unplasticized Polyvinyl Chloride).
• Tests: Dimensional checks, hydrostatic pressure tests, impact resistance.
• Sampling: Random sampling as per IS 10124 (Part 1) for batch conformity.
• Size Tolerances: As per IS 10124 (Part 1) tables (typically ±0.5 mm for diameter).
• Marking: Manufacturer’s name, size, pressure rating, and IS standard number.

Typical Formula for Pressure Rating (Hydrostatic Test):

[ P = \frac{2 \times \sigma_t \times t}{D} ] Where:

• (P) = Pressure rating
• (\sigma_t) = Tensile strength of PVC
• (t) = Wall thickness
• (D) = Outside diameter

Reference Table (from IS 10124 Part 1):

flowchart TD
    A[General Requirements] --> B[Materials: PVC-U]
    A --> C[Tests: Dimensional, Hydrostatic]
    A --> D[Sampling: Random]
    A --> E[Marking: Manufacturer, Size, Rating]
    B --> F[Conform to IS 10124 (Part 1)]
    C --> F
    D --> F
    E --> F

For detailed sizes and test procedures, always refer to **IS 10124

IS 10124 Part 4: Dimensions of Caps (Clause 3.2.2)

Key Parameters:

• D: Mean socket internal diameter (mid-point of socket length) as per IS 10124 Part 1.
• L: Effective minimum socket length.
• t: Minimum wall thickness of caps = 90% of pipe's minimum wall thickness (rounded up to nearest 0.1 mm).

Table 1: Minimum Wall Thickness (t) of Caps for Different Nominal Sizes & Pressure Classes (MPa)

Key Specifications for Marking (IS 10124 Part 4)

1. Marking Requirements (Clause 4.1)

Each end cap must be clearly and indelibly marked with:

• Manufacturer's name or identification mark.
• Size of the cap and the class (working pressure) per IS 4985.
• Colour coding based on class:

2. BIS Certification Marking (Clause 4.2)

• Fittings may bear the Standard Mark as per BIS Act, 1986.
• Use of the mark is regulated by BIS licensing.

Dimensions & Wall Thickness (Table 1, Clause 3.2.2)

• t = Minimum wall thickness = 90% of pipe thickness, rounded to next 0.1 mm.
• D = Mean socket internal diameter.
• L = Effective minimum socket length.

Summary Diagram: Marking & Colour Coding

flowchart TD
    A[End Cap Marking] --> B[Manufacturer

IS 10124 Part 4: Marking Details for End Caps

1. Marking Requirements (Clause 4.1)

Each end cap must be clearly marked with:

• Manufacturer's name or identification mark
• Size of the cap and corresponding class (working pressure) per IS 4985
• Colour code for pressure class:

2. Dimensions & Wall Thickness (Clause 3.2.2 & Table 1)

• Minimum wall thickness (t) depends on nominal size and pressure class.
• Thickness is based on 90% of minimum pipe wall thickness, rounded to next 0.1 mm.

(Refer to full Table 1 for all sizes)

3. Certification Marking (Clause 4.2)

• Use of BIS Standard Mark is regulated; manufacturers may apply under BIS rules.

4. Notes

• Caps for 0.25 & 0.4 MPa classes must be made from 0.

BIS Certification Marking - IS 10124 Part 4 (Clause 4.2)

• Standard Mark Usage: Each fitting may be marked with the BIS Standard Mark as per the Bureau of Indian Standards Act, 1986.
• Licensing: Use of the Standard Mark requires a license from BIS, governed by the Act and related rules.
• Marking Details: Manufacturer details and conditions for license can be obtained directly from BIS.

Key Table: Dimensions of Caps (Table 1, Clause 3.2.2)

Important Parameters:

• D = Mean socket internal diameter (IS 10124 Part 1)
• L = Effective minimum socket length
• t = Minimum wall thickness of caps = 90% of pipe wall thickness (rounded to next 0.1 mm)

Summary:

• BIS marking ensures conformity to standards.
• Wall thickness varies with nominal size and pressure class.
• Refer to Table 1 for exact thickness values per size and pressure.

For licensing and detailed marking rules, contact BIS regional offices or visit www.bis.org.in.

flowchart LR
    A[Fitting] --> B{BIS Standard Mark}
    B

IS 10124 Part 4: Typical Illustration and Specifications of Caps

Key Dimensions & Definitions (Clause 3.2.1 & 3.2.2)

• D = Mean socket internal diameter (mid-point of socket length as per IS 10124 Part 1)
• L = Effective minimum socket length
• t = Minimum wall thickness of caps = 90% of minimum wall thickness of corresponding pipe size & pressure class, rounded to next 0.1 mm

Important Note:

• For 0.25 MPa and 0.4 MPa classes, caps must be made from 0.6 MPa pressure class pipes.

Table 1: Minimum Wall Thickness (t) of Caps (in mm)

(Refer to full table in IS 10124 Part 4 for all sizes)

Marking (Clause 4.1)

• Manufacturer's name/mark
• Size and class (working pressure) per IS 4985
• Colour coding by class:

IS 10124 Part 4: Dimensions of Caps (Clause 3.2.2 & Table 1)

Key Parameters:

• D = Mean socket internal diameter (from IS 10124 Part 1)
• L = Effective minimum socket length
• t = Minimum wall thickness of caps = 90% of pipe wall thickness (rounded up to next 0.1 mm)

Minimum Wall Thickness (t) for Caps (mm)

(Refer to full Table 1 for all sizes)

Important Notes:

• Caps for 0.25 & 0.4 MPa classes must be made from 0.6 MPa class pipes.
• Wall thickness t is based on 90% of pipe thickness, rounded to next 0.1 mm.
• Caps are typically solvent-welded PVC, sometimes with fiberglass reinforcement.

Marking & Color Coding (Clause 4.1)