Injection Moulded/Machined High-Density Polyethylene (HDPE) Fittings for Potable Water Supplies, Part 1: General Requirements for Fittings

IS 8008 Part 1: Scope - Key Points & Specifications

Scope Summary (Clause 1.2):

• Fittings may be welded only to pipes of the same pressure rating.
• Deviations allowed if wall thicknesses are equal in the welding zone.

Referenced Standards (for polyethylene pipes & fittings):

Sampling for Hydraulic Characteristics (Clause 10.2.3.2 & Table 2)

• All samples must pass to accept the lot.
• Samples are randomly selected from dimensional inspection batch.

Rounding Off (IS 2:1960)

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

flowchart TD
    A[Fittings Welding] -->|Same pressure rating| B[Allowed]
    A -->|Wall thickness equal in weld zone| B
    A -->|Otherwise| C[Deviation Not Allowed]

    D[Sampling] --> E{Lot Size}
    E -->|<=25| F[Sample 2]
    E -->|26-150| G[Sample 3]
    E -->|151-1200| H[Sample 5]
    E -->|>1200| I[Sample 6]

Summary: Welding compatibility depends on pressure rating or equal thickness. Sampling for hydraulic tests is size-dependent, ensuring quality control. Refer to related IS standards for material and testing details.

IS 8008 Part 1: Key References & Specifications

Referenced Standards (Clause 1.2)

These IS codes are integral to IS 8008 Part 1, ensuring material and testing compliance:

Welding Compatibility (Clause 1.2)

• Fittings should be welded to pipes of the same pressure rating.
• Deviations allowed if wall thicknesses are equal in the welding zone.

Rounding Off (IS 2:1960)

• Final test or analysis values must be rounded off according to IS 2:1960.
• Retain the same number of significant figures as the specified value.

Summary Table of Part 2 to Part 9 (Foreword)

If you need hydraulic characteristics formulas (Clause 10.2.3) or other specific tables, please specify!

IS 8008 Part 1: Material Requirements Key Points

• Melt Flow Rate (MFR):

  • Must be between 0.41 and 1.10 (inclusive)
  • Test conditions: 190°C, 5 kgf load
  • Test method: As per Clause 7 of IS 2530

• Material Specifications:

  • Refer to Parts 2 to 9 (2003) for specific fittings:
    • Part 2: 90° bends
    • Part 3: 90° tees
    • Part 4: reducers
    • Part 5: ferrule reducers
    • Part 6: pipe ends
    • Part 7: sandwich flanges
    • Part 8: reducing tees
    • Part 9: end caps

Summary Table: MFR Limits for Material

This ensures material consistency and quality for pipe fittings under IS 8008.

flowchart LR
    A[Material Sample] --> B[Test at 190°C, 5kgf]
    B --> C{MFR between 0.41 and 1.10?}
    C -->|Yes| D[Material Approved]
    C -->|No| E[Material Rejected]

IS 8008 Part 1: Rework Material Key Points

• Rework Material Limit: Maximum 10% of manufacturer's own rework material from fittings manufacture can be added.
• No other rework materials are allowed.
• Fitting Color: Must be black to comply with the standard.

Material Specifications

• Melt Flow Rate (MFR):
  [ \text{MFR} = 0.41 \text{ to } 1.10 , \text{g/10 min} ] Tested at 190°C under 5 kgf load as per IS 2530 (Clause 3.4).

• Certified Test Results: Supplier must provide certification for PE compound classification and characteristics per Clauses 3.1 to 3.6 for each batch.

Summary Table: Rework Material Usage

This ensures consistent quality and traceability of PE fittings.

IS 8008 Part 1: Colour and Appearance Key Points

• Carbon Black Content:

  • Resin must contain 2.5 ± 0.5% carbon black by weight (Clause 3.5).
  • Ensures UV resistance and consistent black coloration.

• Dispersion:

  • Carbon black should be uniformly dispersed to avoid streaks or spots, ensuring consistent appearance (Clause 9.4).

• Rounding Off Test Results:

  • Follow IS 2:1960 for rounding test values.
  • Retain the same number of significant figures as specified in the standard.

Summary Table: Carbon Black Content Specification

This ensures pipes and fittings maintain uniform black colour and UV protection as per IS 8008 requirements.

IS 8008 Part 1: Sizes of Fittings - Key Points

• Designation:
  Sizes are based on the outside diameter (OD) at free ends, matching pipe ODs as per IS 4984.

• Nominal Diameter Range (Clause 6.1):
  20, 25, 32, 40, 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500, 560, 630, 710, 800, 900, 1000 mm.

• Welding Length:
  Minimum weld length = 15 mm (to allow rewelding and avoid wastage).

• Sampling for Hydraulic Characteristics (Clause 10.2.3.2):

• Performance: All fittings of same size and pressure rating should comply with hydraulic and dimensional requirements.

Summary Diagram of Size Designation

flowchart TD
    A[Pipe OD as per IS 4984] --> B[Fitting OD at free ends]
    B --> C[Nominal Diameter (20 to 1000 mm)]
    C --> D[Minimum Weld Length = 15 mm]
    D --> E[Hydraulic Testing per Sampling Table]

This ensures fittings match pipe sizes and meet quality standards.

IS 8008 Part 1: Manufacturing Methods for HDPE Fittings

• Fittings Size & Manufacturing:

  • 20 mm to 315 mm: Manufactured by injection moulding and machined as required.
  • 355 mm and above: Manufactured by machining from thick-walled extruded pipes or compression moulded slabs.

• Welding:

  • Fittings may be welded to pipes of the same pressure rating.
  • Deviations allowed if wall thicknesses are equal in the welding zone.

• Related Parts (Specific fittings):

  • Part 2: 90° bends
  • Part 3: 90° tees
  • Part 4: reducers
  • Part 5: ferrule reducers
  • Part 6: pipe ends
  • Part 7: sandwich flanges
  • Part 8: reducing tees
  • Part 9: end caps

• Referenced Standards:

Summary Table: Manufacturing Methods by Fitting Size

If you need formulas for welding or pressure rating, please specify.

Dimensions of Fittings - IS 8008 Part 1 (Summary)

• Designation: Fittings are designated by their outside diameters (OD) at free ends and material grade (Clause 6.2).
• Outside Diameter: Must correspond to pipe ODs as per IS 4984.
• Nominal Diameter Range:
  20, 25, 32, 40, 50, 63, 75, 90, 110, 125, 140, 160, 180, 200, 225, 250, 280, 315, 355, 400, 450, 500, 560, 630, 710, 800, 900, 1000 mm (Clause 6.1).
• Weld Length: Minimum 15 mm weld length is specified to allow for rewelding; typical weld penetration is 3-5 mm, so 15 mm avoids wastage.
• Ovality: Must conform to Table 2 of IS 4984 (oval deviation limits).
• Neck Type: Drawings updated from short neck to long neck pipe ends for clarity and weld length.

Key Specification Table (Excerpt from IS 4984 for OD and Ovality)

Ovality = (Max OD - Min OD) / Nominal OD × 100

flowchart LR
    A[Fittings] --> B[Designated by OD & Grade]
    B --> C[OD per IS 4984]
    B --> D[Nominal Diameter Range]
    B --> E[Minimum Weld Length = 15 mm]
    B --> F[Ovality per IS 4984 Table 2]
    B --> G[Long Neck Pipe Ends]

This ensures fittings properly match pipes, allow rewelding, and

IS 8008 Part 1: Performance Requirements Summary

The code primarily references Part 2 to Part 9 (2003) for specific component requirements (bends, tees, reducers, flanges, end caps).

Key Points on Performance Requirements:

• Hydraulic Characteristics Testing (Clause 10.2.3 & 10.2.3.1):
  After dimensional compliance, the lot must undergo hydraulic testing to verify leak-tightness and pressure resistance.

• Dimensional & Hydraulic Testing:

  • Dimensional checks ensure geometry meets tolerances.
  • Hydraulic tests confirm no leakage at specified test pressures.

Typical Hydraulic Test Formula:

[ P_{test} = 1.5 \times P_{working} ]

Where:

• (P_{test}) = Test pressure
• (P_{working}) = Maximum working pressure

Performance Specifications Table (Indicative):

flowchart LR
    A[Dimensional Checks] --> B[Hydraulic Testing]
    B --> C{Pass?}
    C -- Yes --> D[Lot Approved]
    C -- No --> E[Reject or Re-test]

Summary: IS 8008 Part 1 sets performance requirements through dimensional and hydraulic tests, with detailed specs in Parts 2-9. Hydraulic test pressure is typically 1.5 times working pressure to ensure safety and reliability.

IS 8008 Part 1: Testing and Inspection Key Points

Sampling for Hydraulic Characteristics (Clause 10.2.3.2)

• Sample size for hydraulic testing is based on lot size (Table 2):

• All fittings in the sample must pass hydraulic tests for the lot to be accepted.

Hydraulic Testing of Sandwich Flanges (Clause 9.1)

• Sandwich flanges are tested by welding onto pipe sections.
• Length of pipe section depends on pipe outside diameter (Table 1):

Additional Notes

• Test results must be rounded off according to IS 2:1960 rules.
• Type tests are covered under Clause 10.1.

flowchart TD
    A[Lot of Fittings] --> B{Lot Size?}
    B -->|≤ 25| C[Sample Size = 2]
    B -->|26 to 150| D[Sample Size = 3]
    B -->|151 to 1200| E[Sample Size = 5]
    B -->|> 1200| F[Sample Size = 6]
    C --> G[Hydraulic Test on Sample]
    D --> G
    E --> G
    F --> G
    G --> H{All Samples Pass?}
    H -->|Yes| I[Lot Accepted]
    H -->|No| J[Lot Rejected]

This ensures compliance with hydraulic characteristics per IS 8008 Part 1.

IS 8008 Part 1: Marking and Certification Key Points

Marking Requirements (Clause 11.1)

All HDPE fittings must be clearly marked at a prominent place with:

• Source of manufacture (manufacturer identification)
• Size of the fitting
• Grade of material
• Appropriate working pressure

BIS Certification Mark (Clause 11.2)

• HDPE fittings may bear the BIS Standard Mark.
• Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Manufacturers must obtain a license from BIS to use the Standard Mark.
• Details and conditions for licensing are available from BIS offices.

Contact & Licensing Information

• BIS Headquarters: Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002
• Regional Offices available across India for licensing queries.

Summary Table: Marking & Certification

For detailed licensing conditions and use of the Standard Mark, contact BIS regional offices.

flowchart LR
    A[Manufacturer] --> B[Mark Fittings]
    B --> C{Marking Details}
    C --> D[Manufacturer ID]
    C --> E[Size]
    C --> F[Grade]
    C --> G[Working Pressure]
    A --> H[Apply for BIS License]
    H --> I{License Granted?}
    I -->|Yes| J[Use BIS Standard Mark]
    I -->|No| K[No Certification Mark]

This ensures traceability, quality assurance, and compliance with Indian standards.