Fabricated PVC-U Fittings for Potable Water Supplies - Specification, Part 10: Specific Requirements for 45o Bends

IS 10124 Part 10: Scope & Key Specifications

Scope:

• Specifies dimensions and minimum wall thickness for 45° bends used in ductile iron pipes.
• Covers bends with plain ends and elastomeric sealing ring joints.
• Applies to various nominal pipe sizes and working pressures (0.4 to 1.25 MPa).

Key Table: Dimensions of 45° Bend (Excerpt from Table 1)

• Y = Offset length
• L = Length for plain ends
• R = Radius of bend centerline

Notes:

• Dimensions must comply with Fig. 1 (for plain ends) and Fig. 2 (for elastomeric joints).
• Wall thickness varies by working pressure class (Class 2 to 6).
• Rounding off numerical values follows IS 2:1960.

Summary Diagram:

flowchart LR
    A[Nominal Size] --> B[Dimensions: Y, L, R]
    B --> C[Wall Thickness (t) by Pressure Class]
    C --> D[Compliance with Fig. 1 / Fig. 2]
    D --> E[Application: 45° Bends in Ductile Iron Pipes]

For detailed values, refer to Table 1 and **

IS 10124 (Part 10): Key References, Formulas & Tables

References (Table 2)

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

Important Formulas & Notes (Clause 1.25)

• Minimum Wall Thickness (t):
  ( t = \text{round up to next 0.1 mm} \left( 0.9 \times t_{\text{pipe}} \right) )
  where ( t_{\text{pipe}} ) = minimum wall thickness of pipe for size & pressure class.

• Dimension Y (min):
  ( Y = \frac{45^\circ \times 2 \pi R}{360^\circ} = \frac{\pi R}{4} )

• Minimum Bend Radius (R):
  ( R = 3 \times D ) (D = nominal outside diameter)

• Pressure Class Note:
  For 0.25 MPa class, bends must be from 0.4 MPa class pipes.

Table 1: Dimensions of 45° Bend (Plain Ends)

IS 10124 Part 10 - Manufacture: Key Specifications & Tables

1. Manufacture (Clause 3.2)

• Manufacturing of 45° bends must follow dimensional requirements in Table 1 and Fig. 1 for plain ends.
• For elastomeric sealing ring joints, dimensions are given in Table 2 and Fig. 2 (not provided here).

2. Dimensions of 45° Bend (Clause 3.2.2 & Fig. 1)

• Y, L, R: Key dimensional parameters for the bend.
• Wall thickness varies with working pressure class.

3. Certification Marking (Clause 4.2.1)

• Use of Standard Mark governed by BIS Act 1986.
• Manufacturer must

IS 10124 Part 10: 45° Bend Key Details

1. Typical Illustration (Clause 3.2.1)

• Fig. 1: Shows the geometric layout of a 45° bend for standard joints.
• Fig. 2: Shows the 45° bend for elastomeric sealing ring joints.

2. Dimensions (Clause 3.2.2)

• Dimensions must follow Table 1 for standard bends (Fig. 1).
• Dimensions must follow Table 2 for elastomeric sealing ring joints (Fig. 2).

Key Dimensions from Tables (Summary):

*Exact values depend on pipe size and joint type; refer to IS 10124 Part 10 Tables 1 & 2.

Notes:

• Bend radius (R) is critical for flow and stress considerations.
• Elastomeric sealing ring joints require specific dimensional control for sealing integrity.
• Use the figures and tables in the code for precise fabrication and inspection.

flowchart LR
    A[Start: Straight Pipe] --> B[45° Bend]
    B --> C{Type of Joint}
    C -->|Standard Joint| D[Dimensions from Table 1 & Fig. 1]
    C -->|Elastomeric Sealing Ring Joint| E[Dimensions from Table 2 & Fig. 2]
    D & E --> F[Fabrication & Installation]

For exact values, consult IS 10124 Part 10 Tables 1 and 2 along with Figures 1 and 2.

IS 10124 Part 10: Dimensions for 45° Bends

Key Points from Clause 3.2.2 and Tables:

• Bends: Dimensions for 45° bends are specified in Table 1 (plain ends) and Table 2 (elastomeric sealing ring joints).
• Radius (R): Minimum bend radius = 3 × Nominal Outside Diameter (D).
• Y (Min): Calculated as ( Y = \frac{45^\circ \times 2 \pi R}{360^\circ} = \frac{\pi R}{4} ).
• L (Min): Minimum length of plain ends (Table 1 and 2).
• Minimum Wall Thickness (t): Depends on working pressure class (0.4 to 1.25 MPa).

Table 1 (Example Extract for Plain Ends)

Table 2 (Example Extract for Elastomeric Sealing Ring Joint)

IS 10124 Part 10: End Configurations for 45° Bends (Plain / Socketed)

1. End Types (Clause 3.2.3):

• Bends can be plain at both ends or socketed at one/both ends.
• Socket dimensions must comply with IS 10124 (Part 1).

2. Dimensions (Clause 3.2.2 & Table 1):

• Y = Offset length
• L = Length for plain ends (minimum)
• R = Radius of bend

3. Working Pressure Classes (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

4. Notes:

• Socket dimensions and sealing ring joints have separate tables (see IS 10124 Part 1 & Table 2).
• Wall thickness increases with pressure class and nominal size.
• Plumbing bends have separate thickness requirements.

Summary Diagram of 45° Bend Dimensions

flowchart LR
    A[45° Bend] --> B[Y: Offset length]
    A --> C[L: Length for plain ends]
    A --> D[R: Radius of bend]
    A --> E[t: Wall thickness per pressure class]

References:

• IS 10124 (Part 10), Table 1 for exact dimensions.
• IS 101

IS 10124 Part 10: Marking of 45° Bends

Key Marking Requirements (Clause 4.1)

Each 45° bend must be clearly and indelibly marked with:

• Manufacturer's name or identification mark
• Size of the bend and class (working pressure) per IS 4985
• Degree of bend (45°)
• Colour coding based on class:

BIS Certification Mark (Clause 4.2)

• The Standard Mark may be applied on each bend.
• Licensing details governed by BIS Act, 1986.

Dimensions & Wall Thickness (Clause 3.2.2, Table 1)

• Nominal sizes range from 20 mm to 630 mm.
• Wall thickness varies with class and size, e.g., for 50 mm:
  • Class 4 (0.8 MPa): 2.1 mm
  • Class 5 (1.0 MPa): 2.5 mm
  • Class 6 (1.25 MPa): 3.0 mm

Summary Diagram of Marking

graph TD
A[45° Bend] --> B[Mark Manufacturer]
A --> C[Mark Size & Class]
A --> D[Mark Degree (45°)]
A --> E[Colour Code]
E --> F[Class 2 - Blue]
E --> G[Class 3 - Green]
E --> H[Class 4

IS 10124 Part 10 — Marking Details for 45° Bends

Marking Requirements (Clause 4.1)

Each 45° bend must be indelibly marked with:

• Manufacturer's name or ID
• Size and class (working pressure) per IS 4985
• Degree of bend (45°)
• Colour code by class:

BIS Certification Mark (Clause 4.2)

• Optional BIS Standard Mark may be added per BIS Act 1986.

Key Dimensions & Wall Thickness (Table 1, Clause 3.2.2)

(Full table available in IS 10124 Part 10, Clause 3.2.2)

Summary Diagram of Marking:

graph TD
    A[45° Bend] --> B[Manufacturer's Name/ID]
    A --> C[Size & Class (IS 4985)]
    A --> D[Degree of Bend: 45°]
    A --> E[Colour Marking]
   

BIS Certification Marking (IS 10124 Part 10 - Clause 4.2)

• Standard Mark Usage: Marking of each 45° bend with the BIS Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Licence Conditions: Manufacturers must obtain a license from BIS to use the Standard Mark.

Key Specifications for 45° Bend Marking

Important Notes on Wall Thickness

• Minimum wall thickness ( t ) is 90% of the pipe's minimum wall thickness, rounded up to the next 0.1 mm.
• Bends for 0.25 MPa pressure class must be made from 0.4 MPa class pipes or higher.

Sample Table Extract: Minimum Wall Thickness (t) for 45° Bend (Plain Ends)

BIS Contact for Licensing & Queries

• Headquarters: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002
• Website: www.bis.org.in

flowchart LR
    A[Manufacturer] --> B

IS 10124 (Part 10): 2009 — Key Dimensions & Wall Thickness for 45° Bends

1. Dimensions (Table 1 & Fig. 1 for Plain Ends)

• Nominal Size (mm): 20 to 630
• Radius (R): Minimum radius = 3 × Nominal Outside Diameter (D)
• Y (Min): Calculated from 45° × 2πR / 360°
• L (Min): Length varies with size (see tables below)

2. Minimum Wall Thickness (t) for Working Pressure (MPa)

Note: Minimum wall thickness is 90% of corresponding pipe thickness, rounded up to 0.1 mm.

3. Elastomeric Sealing Ring Joint Bends (Table 2 & Fig. 2)

• Similar nominal sizes but different Y and L values.
• Wall thickness values slightly higher due to sealing requirements.

Sample Extract from Table 1 (Plain Ends)

Important Notes:

• Bends for 0.25 MPa class pipes should be made from 0.4 MPa pipes.
• Dimensions ensure proper fit

Overview of IS 10124 Series (Part 10: 2009)

Scope:
IS 10124 Part 10 covers dimensions and specifications for bends (specifically 45° bends) for elastomeric sealing ring joint pipes.

Key Specifications & Formulas

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

• Minimum Bend Radius (R):
  [ R_{\text{min}} = 3 \times D ]
  Where D = nominal outside diameter.

• Dimension Y (Min):
  [ Y_{\text{min}} = 45^\circ \times 2 \pi R / 360^\circ = \frac{\pi R}{4} ]

• Pressure Class Restrictions:
  Bends for 0.25 MPa pressure class pipes must be made from 0.4 MPa class pipes or higher.

Table Extract: Dimensions of 45° Bend (Example for Nominal Size 110 mm)

Summary Table Format (Excerpt)