Injection Moulded/Machined High-Density Polyethylene (HDPE) Fittings for Potable Water Supplies, Part 4: Specific Requirements for Reducers

IS 8008 Part 4: Scope - Key Specifications and Tolerances

The scope covers dimensions and tolerances for injection molded/machined HDPE fittings, specifically reducers.

Key Tolerances (Clause 1.0)

Dimensional Table for Machined Reducers (Excerpt from Table 2)

• Note: The full table includes multiple sizes and pressure ratings with corresponding dimensional references.

Additional Notes

• Final values must be rounded per IS 2:1960 rules.
• The standard references IS 8008 (Part 1) for general fitting requirements and IS 4984 for HDPE pipe specifications.
• Use of BIS Standard Mark is regulated under BIS Act, 1986.

flowchart LR
    A[HDPE Reducer] --> B[Laying Length (L)]
    A --> C[Weld Length (L₁)]
    A --> D[Manufacturing References (L₂, θ, a)]
    B & C & D --> E[Tolerances ±1 mm or ±1º]
    E --> F[Ens

IS 8008 Part 4: Key References, Dimensions, and Tolerances

1. References (Table 2)

• IS 8008 (Part I): 2003 — HDPE fittings for potable water, general requirements.
• IS 4984: 1995 — HDPE pipes for water supply (4th revision).

2. Dimensional Tolerances (Clause 1.0)

3. Injection Moulded Reducer Dimensions (Table 1)

(Refer Table 1 for full range)

4. Machined Reducer Dimensions (Table 2 excerpt)

• Major Diameter (DI), Minor Diameter (D2), Nominal Pressure (kg/cm²), Laying Length (L), Weld Length (L₁), Manufacturing References (L₂, L₃), and angular tolerances.
• Example:
  • DI=50 mm, D2=40 mm, Pressure=10 kg/cm², L=55.6 mm, L₁=20 mm, L₂=5 mm, L₃=10.6 mm, θ=70º, a=30º.

Summary

• Use IS 8008 (Part I) and IS 4984 for material and

IS 8008 Part 4: Manufacture Key Data

1. Tolerances on Dimensions (Clause 1.0)

2. Laying Length for Injection Moulded Reducers (Clause 3.2.3, Table 1)

(Refer to Table 1 for complete sizes)

3. Dimensions of Machined Reducers (Clause 3.2.4, Table 2)

• Includes Major Diameter (DI), Minor Diameter (D2), Nominal Pressure, Laying Length (L), Weld Length (L₁), and manufacturing references (L₂, L₃), with tolerances.
• Angles θ and a mostly fixed at 70º and 30º respectively.

Summary

• Manufacture tolerances are tight: ±1 mm for lengths, ±1º for angles.
• Use Table 1 for laying length dimensions of injection moulded reducers.
• Use Table 2 for machined reducer dimensions and tolerances.
• Ensure compliance with BIS certification for markings (Clause 4.2.1).

flowchart TD
    A[Manufacture] --> B

IS 8008 Part 4: Marking - Key Points & Specifications

Clause 4.2.1 - BIS Certification Marking:

• Use of the BIS Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Manufacturers must obtain a license from BIS for using the Standard Mark.
• Each reducer fitting may be marked with the Standard Mark to indicate compliance.

Tolerances on Dimensions (Clause 1.0)

Table 2: Dimensions of Machined Reducers (Summary)

• Reducers are defined by Major Diameter (D₁), Minor Diameter (D₂), Nominal Pressure (kg/cm²).
• Key dimensions include:
  • Laying Length (L)
  • Weld Length (L₁)
  • Manufacturing reference lengths (L₂, L₃)
  • Angles θ and a (degrees)

Refer to IS 8008 Part 4 Table 2 for detailed dimensional values.

Important Notes:

• Wall thickness corresponds to IS 4984.
• Marking ensures traceability and quality assurance.
• BIS mark usage requires compliance with licensing conditions.

flowchart TD
    A[Manufacturer] --> B[Apply for BIS License]
    B --> C[Produce Reducers]
    C --> D[Mark Reducers with BIS Standard Mark]
    D --> E[Ensure compliance with IS 8008 Part 4]

For detailed dimensional data, refer directly to Table 2 of IS 8008 Part 4: 2003.

IS 8008 Part 4: Dimensions and Tolerances Summary

1. Tolerances on Dimensions (Clause 1.0)

2. Injection Moulded Reducers Dimensions (Clause 3.2.3, Table 1)

• Key dimensions: DI (major diameter), D2 (minor diameter), L1, L2, and overall laying length Z.
• Example:

(Refer full Table 1 for all sizes)

3. Machined Reducers Dimensions (Clause 3.2.4, Table 2)

• Dimensions include major diameter (DI), minor diameter (D2), nominal pressure, laying length (L), weld length (L1), manufacturing references (L2, L3), and tolerances.
• Example snippet:

IS 8008 Part 4: Material Requirements for Reducers

• Scope: Covers general material, manufacturing, and dimensional requirements for reducers. Specific fittings have separate parts.

• Material Thickness: Wall thicknesses (ep, e2) correspond to IS 4984 standards.

• Certification: Use of BIS Standard Mark follows Bureau of Indian Standards Act, 1986 (Clause 4.2.1).

Key Table: Dimensions of Machined Reducers (Excerpt from Table 2)

Note: Full table includes many size combinations with corresponding lengths, weld lengths, tolerances, and angles.

Important Notes:

• Wall Thickness: Should comply with IS 4984 for pressure ratings.
• Manufacturing: Reducers are machined from thick-walled pipes or compression molded slabs.
• Tolerance: Critical for fitting and welding quality.
• Angles (θ and a): Define bevel and taper angles for welding.

For detailed design, refer to IS 8008 (Part 4) Table 2 for exact dimensions and tolerances per size and pressure

IS 8008 Part 4 (Performance Requirements) does not provide explicit clauses or formulas in the given context. However, based on general engineering principles and IS code practices, performance requirements typically cover:

Key Performance Criteria:

• Strength: Must withstand design loads without failure.
• Leakage: No leakage under specified pressure.
• Durability: Resistance to corrosion and wear.
• Dimensional Tolerances: As per IS 2:1960 for rounding and measurement accuracy.

Rounding Off Values (per IS 2:1960):

• Final values from tests/analysis must be rounded to the same number of significant figures as the specified values.
• Example: If specified value = 12.5 (3 significant figures), measured value 12.467 → round to 12.5.

Typical Formula for Pressure Testing (General Pipe Performance):

[ P = \frac{2 \times \sigma_t \times t}{D} ] Where:

• (P) = Design pressure
• (\sigma_t) = Allowable tensile stress
• (t) = Wall thickness
• (D) = Outside diameter

Summary Table for Performance Checks (Typical):

If you want specifics on end caps, tees, or bends, refer to Parts 9, 8, and 2 respectively.

flowchart LR
    A[Design Load] --> B[Stress Analysis]
    B --> C{Meets Strength?}
    C -- Yes --> D[Check Leakage]
    C -- No --> E[Redesign]
    D --> F{Leakage?}
    F -- No --> G[Performance OK]
    F -- Yes --> E

For detailed formulas and tables, consult the respective parts of IS 8008.

IS 8008 Part 4: Testing and Inspection - Key Specifications

1. Dimensional Tolerances (Clause 1.0)

2. Rounding Off (General Clause)

• Final test or analysis values should be rounded as per IS 2:1960.
• Number of significant digits must match the specified value.

3. Dimensions of Reducers (Table 2, Clause 3.2.4)

• Detailed dimensions for machined reducers are tabulated based on Major Diameter (D₁), Minor Diameter (D₂), and Nominal Pressure (kg/cm²).
• Parameters include:
  • Laying Length (L)
  • Weld Length (L₁)
  • Manufacturing References (L₂, L₃)
  • Angular references (θ, a)
• Tolerances on these dimensions are also specified in the table.

4. Certification Marking (Clause 4.2.1)

• Use of BIS Standard Mark is governed by BIS Act 1986.
• Licensing details available from BIS.

Summary Table Example (Reducer Dimensions Extract)

Note: For detailed dimensional tables and inspection criteria, refer to the full IS 8008 Part

IS 8008 Part 4: Certification and Standard Mark Key Points

BIS Certification Mark (Clause 4.2 & 4.2.1)

• Use governed by: Bureau of Indian Standards Act, 1986.
• Applicability: Each reducer fitting may bear the BIS Standard Mark.
• Licensing: Manufacturers must obtain a license from BIS to use the Standard Mark.
• Purpose: Ensures product quality and conformity to Indian Standards.

Dimensional Tolerances (Clause 1.0 Table)

Important Notes:

• Final test or analysis results must be rounded per IS 2:1960 rules.
• The number of significant figures in results should match the standard's specified values.

Table Reference:

• Table 2 provides detailed dimensions for reducers machined from thick-walled pipes, including laying length, weld length, and manufacturing references with tolerances.

Summary Diagram: BIS Certification Process

flowchart TD
    A[Manufacturer] --> B[Apply for BIS License]
    B --> C{BIS Review}
    C -->|Approved| D[Use BIS Standard Mark]
    C -->|Rejected| E[Revise & Resubmit]
    D --> F[Mark Reducer Fittings]
    F --> G[Market Product with Assurance]

For detailed dimensions and tolerances, refer to Table 2 of IS 8008 Part 4:2003. For licensing details, contact BIS regional offices listed in the standard.

Key Formulas, Tables, and Specifications from IS 8008 Part 4 (2003) Annexures and Tables:

1. Tolerances on Dimensions (Clause 1.0)

2. Table 1: Dimensions for Injection Moulded Reducers (Clause 3.2.3)

• Provides DI (major diameter), D2 (minor diameter), L1, L2, and overall laying length Z for reducers.
• Example entries:

3. Table 2: Dimensions of Machined Reducers (Clause 4.2.1)

• Details major/minor diameters, nominal pressure, laying length (L), weld length (L₁), manufacturing references (L₂, L₃), tolerances, and angular references (θ, a).
• Example snippet: