Fabricated PVC-U Fittings for Potable Water Supplies - Specification, Part 2: Specific Requirements for Sockets
2009 Edition

IS 10124 Part 2: 2009 – Scope & Essential Specifications

Overview:

• Defines dimensions and minimum wall thicknesses for fabricated PVC-U sockets and sockets with elastomeric sealing ring joints intended for potable water distribution.
• Applicable to sockets designed for various operating pressures ranging from 0.25 MPa up to 1.25 MPa.

Key Terms and Formulas:

• D: Average internal socket diameter at mid-length (as per IS 10124 Part 1).
• L: Minimum socket length (refer to IS 10124 Part 1).
• t: Minimum socket wall thickness, calculated as 90% of the minimum pipe wall thickness for the corresponding size and pressure class, rounded up to the nearest 0.1 mm.

Summary of Dimensions (Excerpt):

Refer to Table 1 in the standard for comprehensive details.

Elastomeric Sealing Ring Joint Socket Dimensions:

IS 10124 Part 2: Primary References and Terminology

Referenced Documents (Table 2):

• IS 4985:2000 – Unplasticized PVC pipes for potable water.
• IS 10124 Part 1:2009 – Fabricated PVC-U fittings general requirements.
• IS 2:1960 – Rules for numerical rounding.

Key Parameters:

• D: Average internal diameter of the socket at midpoint (per IS 10124 Part 1).
• L: Minimum socket length (from IS 10124 Part 1).
• t: Minimum wall thickness, defined as 90% of the pipe’s minimum wall thickness, rounded up to the next 0.1 mm.

Dimensional Tables (Excerpt):

Full tables are provided in the standard.

Elastomeric Sealing Ring Joint Socket Dimensions (Excerpt):

IS 10124 Part 2: Critical Dimensions for PVC-U Sockets

1. Socket Dimensions (Referencing Table 1 & Figure 1)

• D: Mean internal diameter of socket at midpoint (as per IS 10124 Part 1).
• L: Minimum length of socket (from IS 10124 Part 1).
• t: Minimum wall thickness, defined as 90% of the corresponding pipe’s minimum wall thickness, rounded up to the closest 0.1 mm.

(Refer to the full Table 1 for all sizes and pressure classes)

2. Sockets Designed for Elastomeric Sealing Ring Joints (Referencing Table 2 & Figure 2)

• Similar dimensional parameters with specified minimum socket lengths and wall thicknesses for pressure classes 2 through 6 (0.4 to 1.25 MPa).

Marking Requirements Under IS 10124 Part 2

1. Identification Markings (Clause 4.1)

Sockets must be permanently and clearly marked with:

• The manufacturer’s name or identification symbol.
• The nominal size and corresponding IS 4985 pressure class.
• Color coding to indicate the pressure class as below:

2. Dimensions and Wall Thickness (Clauses 3.2.1 & 3.2.2)

• Minimum wall thickness (t) calculated as 90% of pipe thickness, rounded to the next 0.1 mm.
• Socket internal diameter (D), length (L), and wall thickness (t) presented in tabulated form.

Examples:

3. BIS Certification Marking (Clause 4.2)

• Sockets may bear the official BIS Standard Mark subject to licensing under the BIS Act, 1986.

Visual Summary Diagram

IS 10124 Part 2: 2009 – Manufacturing Guidelines

1. Dimensions and Wall Thickness (Clauses 3.2.1 and Table 1)

• D: Mean internal socket diameter at midpoint (per Part 1).
• L: Minimum socket length (per Part 1).
• t: Calculated minimum wall thickness equals 90% of the pipe’s minimum thickness for corresponding size and pressure, rounded to the nearest 0.1 mm.

(Refer to full Table 1 for comprehensive data)

2. Sockets for Elastomeric Sealing Ring Joints (Clause 3.2.2 and Table 2)

• Wall thickness varies with the pressure classification, ranging from 0.4 MPa to 1.25 MPa.
• Minimum socket lengths range between 250 mm and 600 mm depending on the nominal diameter.

IS 10124 Part 2: Specifications for Sockets with Elastomeric Sealing Ring Joints

Main Requirements:

• Socket dimensions must comply with Table 2 and Figure 2 of the standard.
• Minimum wall thickness (t) is set at 90% of the corresponding pipe’s minimum wall thickness, rounded to the nearest 0.1 mm.
• Minimum socket length (B, Min) specified in millimeters.

Table 2: Dimensions for Elastomeric Sealing Ring Joint Sockets (all dimensions in mm)

Notes:

• D refers to mean internal socket diameter at midpoint (per Part 1).
• Wall thickness values exclude the groove for the sealing ring.
• Designed to accommodate elastomeric seals ensuring leak-tight joint performance.

Wall Thickness Specifications According to IS 10124 Part 2

Important Parameters:

• D: Mean internal socket diameter at mid-length (from IS 10124 Part 1).
• L: Minimum socket length (per Part 1).
• t: Minimum wall thickness calculated as 90% of the pipe’s minimum wall thickness for the size and pressure category, rounded up to the nearest 0.1 mm.

Minimum Wall Thickness Values (Excerpt from Table 1):

Wall Thickness for Elastomeric Sealing Ring Joint Sockets (Excerpt from Table 2):

Pressure Categories and Color Codes as per IS 10124 Part 2

Pressure Classes and Associated Colors (Clause 4.1):

Marking Details:

• Each socket must display:
  • Manufacturer’s name or mark
  • Nominal size and pressure class (aligned with IS 4985)
  • Color code corresponding to the pressure class

Wall Thickness:

• Determined by nominal size and pressure class.
• Calculated as 90% of the pipe’s minimum wall thickness, rounded to the next 0.1 mm.
• Example: For 50 mm nominal diameter at Class 4 (0.8 MPa), minimum wall thickness is 2.1 mm.

Dimensional Parameters:

• D: Mean socket internal diameter at midpoint
• L: Minimum socket length (per IS 10124 Part 1)
• t: Minimum wall thickness excluding sealing ring groove

Diagrammatic Representation of Marking & Color Coding

graph LR
A[Socket Marking] --> B[Manufacturer ID]
A --> C[Size & Pressure Class]
A --> D[Color Coding]
D --> E{Pressure Class}
E -->|1 (0.25 MPa)| F[Red]
E -->|2 (0.4 MPa)| G[Blue]
E -->|3 (0.6 MPa)| H[Green]
E -->|4 (0.8 MPa)| I[Brown]
E -->|5 (1.0 MPa)| J[Yellow]
E -->|6 (1.25 MPa)| K[Black]
E -->|Plumbing| L[Pink]

Refer to Tables 1 and 2 in IS 10124 Part 2 for comprehensive thickness and color coding information.

Sampling and Testing Guidelines According to IS 10124 Part 2

• Sampling and testing methods align strictly with the procedures outlined in IS 10124 Part 1.

• Rounding of Test Results: In accordance with IS 2:1960, test measurements are rounded to match the number of significant figures specified in the standard.

• Sampling Technique:

  • Samples are selected randomly from production batches.
  • The quantity and size of samples depend on batch size, detailed in IS 10124 Part 1.

• Testing Parameters Include:

  • Chemical composition verification
  • Mechanical properties such as tensile strength, yield strength, and elongation
  • Dimensional accuracy
  • Surface finish quality

• Acceptance Criteria: Product conformity is determined by whether test data lie within prescribed limits.

Rounding Off Example (IS 2:1960)

Testing Workflow

flowchart LR
    A[Batch/Lot] --> B[Random Sampling]
    B --> C[Sample Preparation]
    C --> D[Testing]
    D --> E{Results Within Limits?}
    E -->|Yes| F[Batch Accepted]
    E -->|No| G[Batch Rejected or Retested]

BIS Certification and Standard Marking (IS 10124 Part 2: 2009)

Clause 4.2 – Certification Marking:

• Fabricated PVC-U sockets may bear the BIS Standard Mark if licensed accordingly.
• The use of this mark is regulated under the Bureau of Indian Standards Act, 1986.
• Manufacturers must obtain a license from BIS to apply this certification mark.

Dimensional Specifications Recap

• D: Mean socket internal diameter measured at midpoint (per IS 10124 Part 1).
• L: Minimum length of socket (as specified in IS 10124 Part 1).
• t: Minimum wall thickness calculated as 90% of pipe wall thickness for the corresponding size and pressure rating, rounded up to the nearest 0.1 mm.

Minimum Wall Thickness Values (Excerpt)

Refer to full tables in the standard for complete data including elastomeric sealing ring joint sockets.

Important Notes:

• Wall thickness excludes the groove for sealing rings.
• Dimensions and marking requirements ensure compliance with BIS quality and safety standards.
• Rounding follows IS 2:1960 rules.

Illustrative Diagram of Socket Marking

Compliance and Rounding Procedures in Accordance with IS 10124 Part 2

• Rounding Rules:

  • Numerical values from tests or calculations must be rounded per IS 2:1960.
  • The rounded value must maintain the same number of significant digits as the value specified in the standard.
  • For example, a dimension specified as 12.5 mm (3 significant digits) should be rounded to 3 significant digits.

• General Compliance:

  • Final reported values, after rounding, are used to determine conformity.
  • This approach prevents misinterpretations due to negligible decimal differences.

• Additional Requirements:

  • Specific dimensional tolerances apply for components like caps and 11 1/4 bends as detailed in respective clauses of IS 10124 Part 2.

Rounding Example (Per IS 2:1960)

Compliance Flowchart

flowchart TD
    A[Measured/Calculated Value] --> B[Rounding as per IS 2:1960]
    B --> C[Match Specified Significant Digits]
    C --> D[Compliance Assessment]

Note: Refer to IS 10124 Part 2 for specific dimensional and tolerance requirements for fittings such as bends and caps.