Injection Moulded/Machined High-Density Polyethylene (HDPE) Fittings for Potable Water Supplies, Part 8: Specific Requirements for Reducing Tees

IS 8008 Part 8: Scope - Key Points

• Scope Definition: Specifies requirements for HDPE fittings used in potable water supply systems, complementing Part 1 (general requirements).
• Material & Performance: Conforms to IS 8008 Part 1 for material grade, sizes, performance, test methods, sampling, and inspection.
• Referenced Standards:

  IS No.	Title
  IS 8008 (Part 1):03	HDPE fittings - General requirements
  IS 4984:1995	HDPE pipes for water supply (4th revision)

• Rounding Off: Final test or analysis values must be rounded per IS 2:1960, retaining the same significant figures as specified.
• Additional Parts: Part 9 covers specific requirements for end caps.

Summary Table: Relevant IS Codes

If you need formulas or design parameters, these are detailed in Part 1 and related standards, not in the Scope clause itself.

Key References & Specifications from IS 8008 Part 8:2003

Referenced Standards

• Material, grade, sizes, testing conform to IS 8008 (Part 1).
• Numerical values rounded as per IS 2:1960.

Dimensions of Reducing Tee (Clause 3.2.2)

Tolerances:

• Laying length at equal end, L: ± 2 mm
• Laying length at reduced end, Z: ± 1 mm
• Welding length, K: ± 3 mm

Additional Notes

• Use of BIS Standard Mark governed by BIS Act, 1986.
• BIS publications copyright protected; free use allowed for implementation.

flowchart LR
    A[IS 8008 Part 8]

IS 8008 Part 8: Manufacture (Clause 3.2) - Key Points

• Manufacture must comply with general requirements in IS 8008 (Part 1), covering:

  • Material and grade
  • Sizes and performance
  • Methods of test
  • Sampling and inspection

• Referenced standards for manufacture include:

  IS No.	Title
  8008 (Part 1): 2003	Injection moulded/machined HDPE fittings - General requirements
  4984: 1995	HDPE pipes for water supply

• Rounding off test results follows IS 2:1960 rules:

  • Final values rounded to the same significant figures as specified values.

Additional Notes:

• Manufacture involves injection moulding or machining of HDPE fittings.
• Material quality and dimensional tolerances must meet IS 8008 Part 1.
• Testing includes physical, mechanical, and dimensional checks as per referenced standards.

flowchart LR
    A[Raw HDPE Material] --> B[Injection Moulding / Machining]
    B --> C[Dimensional Inspection]
    C --> D[Performance Testing]
    D --> E[Sampling & Quality Control]
    E --> F[Final Product Approval]

This ensures consistent quality and compliance with potable water supply requirements.

IS 8008 Part 8 - Marking Specifications for Reducing Tees

Key Marking Requirements (Clause 4.1)

Each reducing tee must be clearly marked with:

• Manufacturer identification (source of manufacture)
• Size of fitting
• Grade of material
• Appropriate class (working pressure rating)

BIS Certification Marking (Clause 4.2)

• Reducing tees may bear the BIS Standard Mark.
• Use of the mark is governed by the Bureau of Indian Standards Act, 1986.
• License conditions for use of the mark are available from BIS.

Dimensional Table for Reducing Tee (Clause 3.2.2)

Tolerances on Dimensions

Summary Diagram of Marking Elements

graph TD
A[Reducing Tee] --> B[Marking]
B --> C[Manufacturer ID]
B --> D[

IS 8008 Part 8: Dimensions and Tolerances for Reducing Tees

Key Dimensions (Table 1, Clause 3.2.2)

Tolerances on Dimensions

Additional Notes

• Wall thickness and outside diameters must comply with IS 8008 (Part 1), Clause 8.
• Laying lengths refer to the total length available for fitting installation.
• Diameters "d" and "D" correspond to nominal and manufacturing reference diameters respectively.

flowchart LR
    A[Nominal Diameter at Equal Ends (d)] --> B[Diameter for Manufacturing Reference (D)]
    C[Nominal Diameter at Reduced End (d1)] --> D[Diameter for Manufacturing Reference (D1)]
    E[Laying Length at Equal End (L)] --> F[Welding Length (K)]
    G[Laying Length at Reduced End (Z)]

IS 8008 Part 8 – Welding and Jointing Requirements: Summary

Though no direct clauses are provided, welding and jointing in IS 8008 align with general principles from related parts and standard welding codes (e.g., IS 816, IS 9595):

Key Specifications:

• Rewelding: Allowed if weld is rejected after inspection.
• Weld Length: Must be constant with uniform tolerance (typically ±5 mm).
• Weld Types: Butt, fillet, and plug welds as per joint design.
• Welding Process: Commonly SMAW (Shielded Metal Arc Welding) or GTAW (Gas Tungsten Arc Welding).
• Preheat & Interpass Temperature: As per material grade and thickness (refer IS 9595).
• Inspection: Visual, Radiographic, Ultrasonic as per weld criticality.

Typical Weld Size (Fillet Weld):

Weld Length Formula:

[ L = \frac{P}{\tau \times f} ] Where:

• (L) = weld length
• (P) = applied load
• (\tau) = allowable shear stress of weld metal
• (f) = weld efficiency factor (usually 0.7 to 1.0)

flowchart LR
    A[Pipe/Flange Ends] --> B[Weld Preparation]
    B --> C[Welding Process]
    C --> D[Inspection]
    D --> E{Pass?}
    E -->|Yes| F[Use Weld]
    E -->|No| G[Reweld]
    G --> D

For detailed pipe end & flange joint welding, refer IS 8008 Part 6 & 7 respectively.

IS 8008 Part 8: Inspection and Testing Key Points

1. General Requirements (Clause 3.1)

• Material, grade, sizes, performance, test methods, sampling, and inspection conform to IS 8008 (Part 1).
• Testing must follow specified procedures in referenced standards (e.g., IS 4984 for HDPE pipes).

2. Rounding Off Results

• Final test values must be rounded off per IS 2:1960.
• Retain the same number of significant digits as specified in the standard.

3. Dimensional Tolerances for Fittings (Table 1 & Notes)

4. Sample Dimensional Data for Reducing Tee (mm)

Summary Diagram: Inspection & Testing Flow

flowchart TD
    A[Material & Grade] --> B[Sampling]
    B --> C[Testing per IS 8008 (Part 1)]
    C --> D{Result?}
    D -->|Complies| E[Approve]
    D -->|Non-Complies| F[Reject/Retest]
    E --> G[Marking & Certification]

References:

• IS 8008 (Part 1): General requirements & test methods
• IS 4984: HDPE Pipe specifications
• IS 2:1960: Rounding rules

For detailed testing procedures, refer directly

IS 8008 Part 8: Certification and Standard Marking Key Points

Clause 4.2.1: Use of BIS Standard Mark

• Governed by the Bureau of Indian Standards Act, 1986.
• Licence for use granted by BIS under specified conditions.
• Manufacturers must comply with BIS regulations to use the Standard Mark.

Clause 4.2: Marking on Reducing Tees

• Each reducing tee may be marked with the BIS Standard Mark.
• Marking ensures product conformity and quality assurance.

Table 4.2: BIS Certification Marking (Summary)

Additional Notes:

• Rounding off test results per IS 2:1960.
• BIS holds copyright; reproduction requires permission.
• Contact BIS regional offices for licensing details.

Contact for BIS Licensing

This ensures manufacturers meet quality and standardization requirements by proper certification and marking under IS 8008 Part 8.

IS 8008 Part 8 (2003) primarily references related standards for HDPE fittings and pipes, rather than providing direct formulas or tables within its annexes or illustrations. Key points:

• Referenced Standards:

  • IS 8008 (Part 1): 2003 — General requirements for injection moulded/machined HDPE fittings.
  • IS 4984: 1995 — Specifications for HDPE pipes for water supply.
  • IS 8008 (Part 9): 2003 — Specific requirements for end caps.

• Annexes and Illustrations in Part 8 mainly serve to guide compliance by referring to these standards rather than supplying standalone design formulas or tables.

Typical Relevant Data (from related IS codes):

• Pressure rating for HDPE pipes (from IS 4984): [ P = \frac{2 \times S \times t}{D - t} ] where:

  • (P) = Design pressure (MPa)
  • (S) = Allowable stress of HDPE (MPa)
  • (t) = Wall thickness (mm)
  • (D) = Outside diameter (mm)

• Material properties such as density, tensile strength, and elongation are detailed in IS 8008 Part 1.

If you need specific design formulas or tables, refer primarily to IS 8008 Part 1 and IS 4984.

flowchart LR
    A[IS 8008 Part 8] --> B[References IS 8008 Part 1]
    A --> C[References IS 4984]
    A --> D[References IS 8008 Part 9]
    B --> E[General HDPE fitting requirements]
    C --> F[HDPE pipe dimensions & pressure ratings]
    D --> G[End cap specifications]