Injection Moulded/Machined High-Density Polyethylene (HDPE) Fittings for Potable Water Supplies, Part 1: General Requirements for Fittings
2003 Edition

Overview of Scope (Clause 1.2):

• HDPE fittings are to be welded exclusively to pipes sharing the same pressure rating.
• Exceptions permitted only if the wall thickness in the welding area is identical.

Relevant Standards Referenced:

Sampling Plan for Hydraulic Properties (Clause 10.2.3.2 & Table 2):

• All sampled fittings must pass tests for the lot to be approved.
• Samples are randomly selected from dimensional inspection batches.

Rounding Off Guidelines (IS 2:1960):

• Test results should be rounded to the same significant figures as the standard specifies.

flowchart TD
    A[Fitting Welding] -->|Same Pressure Rating| B[Permitted]
    A -->|Equal Wall Thickness at Weld Zone| B
    A -->|Otherwise| C[Not Permitted]

    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 requires pressure rating matching or equal wall thickness; sample sizes for hydraulic testing depend on lot size, ensuring quality control.

Key References in IS 8008 Part 1 (Clause 1.2): These Indian Standards form the backbone for material and testing compliance:

Welding Compatibility Rules:

• Fittings must be welded to pipes possessing identical pressure ratings.
• Variations allowed if the wall thickness at the welding region matches.

Rounding Off:

• Final test values are rounded off as per IS 2:1960, maintaining the original number of significant digits.

Overview of Parts 2 to 9 (Foreword):

For additional hydraulic characteristic formulas or specific tables, please indicate.

Essential Material Criteria in IS 8008 Part 1:

• Melt Flow Rate (MFR):

  • Must lie between 0.41 and 1.10 g/10 min (inclusive).
  • Tested at 190°C under a 5 kgf load.
  • Testing procedure according to Clause 7 of IS 2530.

• Material Standards:

  • Specific fittings covered under Parts 2 to 9 (2003) such as bends, tees, reducers, ferrule reducers, pipe ends, flanges, and end caps.

MFR Limits Summary:

This specification assures consistent material quality suitable for HDPE fittings for potable water systems.

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

Guidelines on Rework Material in IS 8008 Part 1:

• Maximum of 10% of the manufacturer's own reprocessed material derived from fittings production may be incorporated.
• No other sources of reprocessed material are permitted.
• The fitting must be black in color to comply with the standard.

Material Details:

• Melt Flow Rate (MFR): 0.41 to 1.10 g/10 min, tested at 190°C under 5 kgf load as per IS 2530 Clause 3.4.
• Suppliers must provide certification for the polyethylene compound classification and characteristics for each batch (Clauses 3.1 to 3.6).

Rework Material Usage Summary:

This ensures the quality and traceability of the HDPE fittings material.

Colour and Appearance Requirements in IS 8008 Part 1:

• Carbon Black Content:

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

• Carbon Black Dispersion:

  • Must be evenly dispersed without streaks or blotches to maintain uniform appearance (Clause 9.4).

• Rounding Off:

  • Test results shall be rounded as per IS 2:1960, keeping the same significant figures as specified.

Carbon Black Content Summary:

These criteria ensure HDPE fittings maintain uniform black coloration and adequate protection against UV degradation.

Specifications for Fitting Sizes in IS 8008 Part 1:

• Size Identification:

  • Based on the outside diameter (OD) at free ends, matching the pipe OD 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.

• Minimum Weld Length:

  • 15 mm to allow re-welding and avoid material wastage.

• Sampling for Hydraulic Testing (Clause 10.2.3.2): | Lot Size | Sample Test Size | |----------|------------------| | Up to 25 | 2 | | 26 to 150 | 3 | | 151 to 1200 | 5 | | Above 1200 | 6 |

• All fittings of identical size and pressure rating must meet hydraulic and dimensional criteria.

Diagram: Size Designation and Testing

flowchart TD
    A[Pipe Outside Diameter per IS 4984] --> B[Fitting Outside Diameter at Free Ends]
    B --> C[Nominal Diameter Range: 20-1000 mm]
    C --> D[Minimum Weld Length: 15 mm]
    D --> E[Hydraulic Testing Sample Size as per Lot]

These specifications guarantee proper fitment and compliance with quality standards.

Manufacturing Details for HDPE Fittings as per IS 8008 Part 1:

• Fitting Sizes and Production Methods:

  • For sizes 20 mm to 315 mm: produced by injection moulding combined with machining as necessary.
  • For sizes 355 mm and above: manufactured by machining from thick extruded pipes or compression moulded slabs.

• Welding Compatibility:

  • Fittings are welded to pipes having the same pressure rating.
  • Allowed deviations if wall thicknesses at the weld zone are identical.

• Related Part Standards:

  • 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 IS Codes: | IS Number | Title | |-----------|---------| | 2530:1963 | Test methods for polyethylene moulding materials | | 4984:1995 | HDPE pipes for potable water supply | | 7328:1992 | HDPE materials for moulding and extrusion | | 10141:1982 | Constituents of polyethylene safe for contact with food and water |

Manufacturing Method Summary:

For welding or pressure rating calculations, please specify.

Summary of Dimensional Requirements in IS 8008 Part 1:

• Designation: Fittings are identified by their outside diameters (OD) at the free ends along with material grade (Clause 6.2).
• Outside Diameter: Must align with pipe ODs specified in IS 4984.
• Nominal Diameter Range:
  • From 20 mm up to 1000 mm as per Clause 6.1.
• Minimum Weld Length:
  • 15 mm minimum weld length to facilitate rewelding and reduce wastage.
• Ovality:
  • Must conform to ovality limits outlined in Table 2 of IS 4984.
• Neck Design:
  • Updated drawings specify long neck pipe ends for clarity and welding length considerations.

Key Dimension Data (Excerpt from IS 4984):

Ovality Calculation: (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 as per IS 4984 Table 2]
    B --> G[Long Neck Pipe Ends]

These dimensions ensure proper pipe fitting match and allow for effective welding.

Performance Requirements in IS 8008 Part 1:

This standard references Parts 2 through 9 for detailed performance specifications for various fittings.

Highlights:

• Hydraulic Testing (Clauses 10.2.3 & 10.2.3.1):

  • After dimensional verification, fittings undergo hydraulic testing to confirm resistance to leakage and pressure endurance.

• Dimensional and Hydraulic Evaluation:

  • Dimensions must meet tolerance requirements.
  • Hydraulic tests involve applying pressure to detect leaks.

Standard Hydraulic Test Pressure Formula:

[ P_{test} = 1.5 imes P_{working} ]

Where:

• (P_{test}) is the test pressure,
• (P_{working}) denotes the maximum operational pressure.

Typical Performance Parameters:

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

Summary: IS 8008 Part 1 mandates dimensional and hydraulic performance tests to ensure durability and reliability, with detailed criteria in subsequent parts.

Testing and Inspection Details per IS 8008 Part 1:

Hydraulic Sampling Plan (Clause 10.2.3.2):

• Sample sizes for hydraulic testing vary depending on lot size:

• Every fitting in the sample must pass hydraulic tests for the entire lot to be accepted.

Hydraulic Testing of Sandwich Flanges (Clause 9.1):

• Flanges are welded onto pipe sections.
• Required pipe section length is based on pipe OD:

Additional Notes:

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

flowchart TD
    A[Lot of Fittings] --> B{Lot Size}
    B -->|<=25| C[Sample Size: 2]
    B -->|26-150| D[Sample Size: 3]
    B -->|151-1200| E[Sample Size: 5]
    B -->|>1200| F[Sample Size: 6]
    C --> G[Hydraulic Testing]
    D --> G
    E --> G
    F --> G
    G --> H{All Samples Passed?}
    H -->|Yes| I[Accept Lot]
    H -->|No| J[Reject Lot]

This ensures hydraulic performance compliance as per standard requirements.

Marking and Certification as per IS 8008 Part 1:

Marking Details (Clause 11.1):

• Each HDPE fitting must be distinctly marked with:
  • Manufacturer's identification
  • Fitting size
  • Material grade
  • Applicable working pressure

BIS Standard Mark (Clause 11.2):

• HDPE fittings may bear the BIS Standard Mark.
• Usage governed by the Bureau of Indian Standards Act, 1986.
• Manufacturers need a valid BIS license to employ the Standard Mark.
• Licensing details are available at BIS headquarters and regional offices.

Contact Information:

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

Marking and Certification Summary:

flowchart LR
    A[Manufacturer] --> B[Apply Markings]
    B --> C{Marking Details}
    C --> D[Manufacturer ID]
    C --> E[Size]
    C --> F[Material 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 process ensures product traceability, quality assurance, and standards compliance.