fabricated high-density polyethene (MDPE) fittings for potable water supplies, Part 2 Specific requirements for 90-degree tees

IS 8360 Part 2: Introduction and Adoption - Key Specifications

1. Fabricated 90° Tees - Overall Laying Length (Z)

From Clause 2.2.2 and Table 1, the overall laying length (Z) for fabricated 90° tees is specified as:

2. Notes:

• These dimensions are critical for fabrication and installation accuracy.
• Tolerances increase with size, reflecting manufacturing and handling constraints.

3. Additional Guidance:

• The laying length Z is measured along the centerline of the pipe.
• Ensure compliance with marking requirements as per Clause 2.2.2.

This table is essential for engineers specifying or fabricating pipe tees under IS 8360 Part 2. For detailed design or installation

Rounding Off Rules for Test Values (IS 8360 Part 2)

• As per Clause 0.4, all final test or analysis values must be rounded according to IS:2-1960 (Rules for rounding off numerical values).
• The number of significant digits in the rounded value must match the number of significant digits in the specified value of the standard.
• This ensures consistency and fairness in compliance evaluation.

IS:2-1960 Rounding Summary:

Example from IS 8360 Part 2 (Clause 2.2.2):

• The laying length values and tolerances are specified with 2 or 3 significant digits; rounding must preserve this.

Summary:

• Round test values per IS:2-1960.
• Retain the same significant figures as the standard’s specified values.
• Apply this rule consistently for all test results to check compliance.

flowchart LR
    A[Test/Analysis Value] --> B[Round per IS:2-1960]
    B --> C[Match significant digits of Specified Value]
    C --> D[Compare with Standard Limits]
    D --> E{Pass/Fail}

IS 8360 Part 2 — Fabricated 90° Tee Key Details

Illustration

• Refer to Fig. 1 (Clause 2.2.1) for the typical fabricated 90° tee shape and dimensions.

Key Specification: Overall Laying Length (Z)

• The overall laying length (Z) is crucial for installation and fabrication.
• Given in Table 1 (Clause 2.2.2), Z varies by pipe size with specified tolerances.

Notes:

• The laying length Z is measured along the centerline of the run pipe including the branch.
• Tolerances increase with size due to fabrication constraints.

flowchart TB
    A[Run Pipe] -->|Main axis| B(90° Tee)
    B -->|Branch pipe at 90°| C[

IS 8360 Part 2: Laying Length and Tolerances for 90° Tees

Key Specification (Clause 2.2.2):

• Overall Laying Length (Z) and tolerance must follow Table 1 and Fig. 1 (not provided here).

Table 1: Overall Laying Length (Z) & Tolerances for 90° Tees

Notes:

• Laying length (Z) is the total length of the fabricated 90° tee.
• Tolerances increase with size to accommodate manufacturing variances.
• Ensure compliance with Fig. 1 for dimensional layout (typically shows tee geometry).

Summary:

• Use the table for fabrication control.
• Maintain tolerances for fit and assembly.

IS 8360 Part 2: Pipe Diameter & Wall Thickness for 90° Tees

Key Points from Clauses:

• Outside Diameter & Wall Thickness:
  Must comply with IS 8360 Part 1 (1977).
  Wall thickness of fabricated 90° tees ≥ wall thickness of the pipe welded to.

• Laying Length (Z) for 90° Tees (Clause 2.2.2 & Table 1):

Additional Notes:

• Wall Thickness Check:
  [ t_{tee} \geq t_{pipe} ]

• Diameter Compliance:
  Use pipe outside diameters as per IS 8360 Part 1 for fabrication

IS 8360 Part 2: Marking & Dimensions for Fabricated 90° Tee Fittings

Key Specifications:

• Marking (Clause 3.1.1):
  • Each fabricated 90° tee fitting may be marked with the Standard mark for identification and compliance.

Dimensions for Overall Laying Length (Z) (Clause 2.2.2 & Fig. 1):

Summary:

• Marking: Standard mark is optional but recommended.
• Dimension Z: Critical for installation; specified with tolerances to ensure fit.
• Use the above table for fabrication and verification of 90° tee fittings.

flowchart LR
    A[Fabricated 90° Tee] --> B{Marking}
    B -->|Standard Mark| C[

Use of Standard Mark and Licensing (IS 8360 Part 2)

• Clause 3.1.2: The use of the Standard Mark is regulated by the Bureau of Indian Standards Act, 1986 and associated rules.
• Manufacturers must obtain a license from BIS to use the Standard Mark on products.
• Licensing conditions and detailed provisions are available directly from the Bureau of Indian Standards (BIS).

Contact Details for Licensing & Queries

Key Notes on Marking (Clause 3.1.1)

• Each fabricated 90° tee fitting must be marked with the Standard Mark.

Table: Laying Length of Fabricated 90° Tees (Clause 2.2.2)

IS 8360 Part 2: Dimensions for Laying Length of 90° Tees

Key Specification:

• Overall Laying Length (Z) for fabricated 90° tees is specified in Table 1 (Clause 2.2.2).

Additional Specifications (Clause 2.2.3):

• Outside diameters and wall thicknesses of pipes for 90° tees must comply with IS 8360 Part 1 (1977).
• Wall thickness of fabricated 90° tee ≥ wall thickness of pipe it is welded to.

Summary:

• Use the above table for laying length Z when designing or fabricating 90

IS 8360 Part 2: Scope and Application – Key Specifications

• Scope: Covers specific requirements for fabricated 90° tees used in pipeline systems.
• Material & Testing: Must comply with IS 8360 Part 1 (1977) for materials, sizes, test methods, and sampling.
• Rounding Off: Final test/analysis values rounded per IS:2-1960, matching significant figures of specified values.

Key Table: Overall Laying Length (Z) of Fabricated 90° Tees (Clause 2.2.2)

Use this table to ensure correct fabrication and installation dimensions for 90° tees.

For detailed design, refer to IS 8360 Part 1 for material and test specifications, and IS

IS 8360 Part 2: Compliance and Testing Procedures Summary

• Rounding Off Results (Clause 0.4):
  Test or analysis results must be rounded according to IS:2-1960.

  • Retain the same number of significant digits as specified in the standard.

• General Testing Requirements (Clause 2.1):

  • Follow material, size, test methods, and sampling as per IS 8360 Part 1 (1977).

• Fabricated 90° Tees Laying Length (Clause 2.2.2 & Table 1):
  The overall laying length Z for 90° tees is specified with tolerances:

Key Notes:

• The laying length Z is critical for fitment and compliance.
• Testing methods and sampling follow Part 1, ensuring consistent quality.
• Always verify rounding precision to avoid non-compliance.

flowchart TD
    A[Test/Analysis Results] --> B[Rounding as per IS:2-1960]
    B --> C[Compare with Specified Values]
    C --> D{Within Tolerance?}
    D -- Yes --> E[Compliant]
    D -- No --> F[Non-Compliant]

For detailed test methods, refer IS 8360 Part 1.