Fabricated PVC-U Fittings for Potable Water Supplies - Specification, Part 9: Specific Requirements for 60 o Bends

IS 10124 Part 9 (2009) - Scope: Key Dimensions & Specifications for 60° Bends

1. Scope Overview:

• Specifies dimensions and minimum wall thickness for 60° bends used in pipes.
• Applies to bends with plain ends and elastomeric sealing ring joints.
• Dimensions and thicknesses vary with nominal pipe size and working pressure class.

2. Key Dimensions for 60° Bends (Table 1 & Fig. 1):

• Y = Distance from pipe end to start of bend.
• L = Length of straight end (only for plain ends).
• R = Radius of bend centerline.

3. Rounding Off:

• Final test or calculation results

IS 10124 Part 9: Key References, Formulas & Tables

1. References (Table 2)

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

2. Dimensions of 60° Bends (Clause 3.2.2)

• Radius of bend (R):
  [ R = 3 \times \text{Nominal Outside Diameter (D)} ]

• Y dimension:
  [ Y = 2 \times R \times \sin 60^\circ ]

• Minimum 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.

3. Table 1: 60° Bend Dimensions (Plain Ends)

IS 10124 Part 9 (2009) - Manufacture Key Points

1. Manufacture (Clause 3.2)

• Manufacture of 60° bends must follow dimensional specifications in Table 1 and Fig. 1.
• For elastomeric sealing ring joints, dimensions are per Table 2 and Fig. 2 (not provided here).

2. Dimensions of 60° Bends (Clause 3.2.2 & Table 1)

• Y = Minimum dimension for plain ends (mm)
• L = Length of bend (mm)
• R = Radius of bend (mm)
• Wall thickness depends on working pressure class.

3. Certification Marking (Clause 4.2.1)

• Use of Standard Mark governed by BIS Act 1986.
• License conditions available from Bureau of Indian Standards.

Summary:

• Manufacture must strictly follow dimensional tables for 60° bends.
• Wall thickness varies by pressure class

IS 10124 Part 9 (2009) — Key Dimensions for 60° Bends

1. Dimensional Parameters (See Fig.1 & Fig.2 in the code)

• Y = Minimum dimension related to bend height
• L = Minimum length (for plain ends)
• R = Minimum bend radius = 3 × Nominal Outside Diameter (D)
• t = Minimum wall thickness depends on working pressure class (MPa)

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

3. Tables Summary

Table 1: 60° Bends (Plain Ends)

| Nominal Size (mm) | Y (mm) | L (mm) | R (mm) | Min Wall Thickness (t) for 1.0 MPa | For example: 50 mm size | 50 | 158 | 50 | 150 | 2.5 mm |

• Radius R = 3 × Nominal Diameter (D)
• Y calculated as: ( Y = 2 \times R \times \sin 60^\circ )

Table 2: 60° Bends for Elastomeric Sealing Ring Joints

| Nominal Size (mm) | Y (mm) | L (mm) | R (mm) | Min Wall Thickness (t) for 1.0 MPa | For example: 110 mm size | 110 | 346 | 127 | 330 | 5.5 mm |

• For 0.25 MPa class, bends must be made from 0.4 MPa class pipes.

4. Important Notes

• Minimum wall thickness is 90% of the corresponding pipe thickness, rounded to 0.1 mm.
• The dimensions ensure structural integrity and compatibility with pipe pressure classes.
• The bend radius and dimensions are standardized for hydraulic and mechanical performance.

graph LR
A[

IS 10124 Part 9: Marking of 60° Bends

Key Marking Requirements (Clause 4.1)

Each 60° bend must be indelibly marked with:

• Manufacturer's name or ID
• Size and class (working pressure) as per IS 4985
• Degree of bend (60°)
• Colour code indicating class of fitting:

BIS Certification Mark (Clause 4.2)

• Optional Standard Mark as per BIS Act 1986.
• Manufacturer must comply with BIS licensing rules.

Dimensions & Wall Thickness (Table 1 Highlights)

Refer to full Table 1 for all sizes and thicknesses.

Summary Diagram of Marking Elements

flowchart LR
    A[60° Bend] --> B[Mark Manufacturer ID]
    A --> C[

IS 10124 Part 9: Marking and Dimensions for 60° Bends

Key Points on 60° Bends:

• Dimensions: Must comply with Table 1 and Fig. 1 for standard bends.
• For elastomeric sealing ring joints, use Table 2 and Fig. 2.
• Marking details typically include:
  • Bend angle (60°)
  • Nominal pipe size (NPS)
  • Manufacturer’s identification
  • Material grade
  • Batch or heat number

Typical Dimensions (from IS 10124 Part 9):

Marking Specifications:

• Markings should be clear, durable, and legible.
• Position markings on the outer curve of the bend.
• Use stenciling, embossing, or engraving methods.

flowchart LR
    A[Start] --> B[Identify Pipe Size (D)]
    B --> C[Calculate Bend Radius R = 1.5 × D]
    C --> D[Cut Bend at 60° Angle]
    D --> E[Apply Markings: Angle, Size, Manufacturer]
    E --> F[Inspection & Quality Check]
    F --> G[Ready for Installation]

For exact dimension values, refer to IS 10124 Part 9 Tables 1 & 2 and accompanying figures.

IS 10124 Part 9 (2009) - BIS Certification Marking Key Points

BIS Certification Marking (Clause 4.2)

• Pipes and bends may be marked with the BIS Standard Mark as per Bureau of Indian Standards Act, 1986.
• Licence for use of the Standard Mark is governed by BIS rules.
• Marking ensures compliance with quality and standardization.

Key Formulas and Specifications

• Minimum Wall Thickness (t):
  Calculated as 90% of the minimum wall thickness of the corresponding pipe size & 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.

• Y (Minimum Length):
  [ Y_{\text{min}} = 60^\circ \times 2\pi R / 360^\circ = \frac{\pi R}{3} ]

Tables Summary (Dimensions in mm)

_(Refer to IS 10124 Part 9 Table

IS 10124 Part 9: 60° Bends – Key Dimensions and Specifications

From Clause 3.2.2:

• 60° bends dimensions must follow Table 1 and Fig. 1.
• For elastomeric sealing ring joint 60° bends, dimensions must follow Table 2 and Fig. 2.

Typical Key Parameters (from IS 10124 Part 9):

Illustrative Geometry (Fig. 1):

flowchart LR
    A[Start of Bend] --> B{Bend Radius R}
    B --> C[Arc length = R × θ (in radians)]
    C --> D[End of Bend]

• Arc length ( L = R \times \theta ) (where (\theta = 60^\circ = \pi/3) radians)
• For elastomeric sealing joints, dimensions adjust to accommodate sealing rings (see Table 2).

Recommendations:

• Always refer to Table 1 and Fig. 1 for exact dimensions per pipe diameter.
• For sealing ring joints, use Table 2 and Fig. 2.
• Bend radius typically ranges 1.5 × D to ensure smooth flow and structural integrity.

Note: Since the exact tables and figures are not provided here, consult the IS 10124 Part 9 document for precise numeric values and detailed illustrations.

IS 10124 Part 9 (2009) - Dimensions & Wall Thickness for 60° Bends

Key Specifications:

• Bend Radius (R): Minimum radius = 3 × Nominal Outside Diameter (D)
• Dimension Y (Min): ( Y = 60^\circ \times \frac{2}{360^\circ} \times \pi \times R ) (arc length for 60° bend)
• Ends: Bends may have plain ends or socketed ends (socket dimensions per IS 10124 Part 1).

Table 1: Dimensions & Minimum Wall Thickness for 60° Bends (Plain & Socketed Ends)

(Full table available in IS 10124 Part 9 Table 1)

Table 2: Dimensions for 60° Bends with Elastomeric Sealing

IS 10124 Part 1: General Requirements Summary

Scope:

• Material, sizes, tests, sampling, and conformity criteria for steel pipes and fittings.
• Applies to all parts including bends, tees, reducers, etc.

Key Specifications:

• Material: As per IS 3589 or relevant IS standards for steel pipes.
• Sizes: Nominal sizes defined with dimensional tolerances.
• Tests: Include hydrostatic test, flattening test, bend test, chemical composition, and mechanical properties.
• Sampling: Random sampling based on batch size.
• Conformity: Pipes/fittings must meet dimensional and mechanical property criteria.

Important Formulas & Tables (from IS 10124 Part 9 & Part 1):

Minimum Wall Thickness (t) for 60° Bends (in mm)

(Refer to IS 10124 Part 9 Table 1 for full details)

Additional Notes:

• Marking: Use of BIS Standard Mark is