Polyethene/ Aluminium/ Polyethylene Composite Pressure Pipes for Hot and Cold Water Supplies

IS 15450 - Scope & Key Specifications Summary

Scope (Clause 1.3):

• Applies to PE-AL-PE composite pipes (polyethylene-aluminium-polyethylene).
• Excludes fittings and connectors.
• Pipes designated by nominal inside and outside diameters; dimension ratio concept not used.

Referenced Standards

Key Tables & Test Requirements

PE Compound Characteristics (Table 3):

Dimensional & Visual Sampling (Table 7):

• Sampling size varies with lot size (e.g., up to 25 pipes: 3 samples; 26-150 pipes: 13 samples).
• Acceptance/rejection numbers defined for quality control.

Mechanical Properties (Ring Strength & Burst Pressure):

Hydraulic Pressure Test (Table 5):

• Test pressure

IS 15450 References - Key Specifications & Tables

1. Referenced Standards:

2. PE Compound Characteristics (Table 3):

3. Pipe Designation:

• PE-AL-PE composite pipes are designated by nominal inside and outside diameters.
• Dimension ratio (DR) is not applicable for PE-AL-PE pipes.
• Pressure rating is not related to total wall thickness by DR.

Summary:

• Use IS 2530 and IS 7328 for polyethylene testing.
• Refer to IS 9845 for migration test methods.
• PE-AL-

IS 15450: Key Details on Pipe Designation for PE-AL-PE Composite Pipes

1. Pipe Designation:

• Pipes are designated by Nominal Inside Diameter (ID) and Nominal Outside Diameter (OD).
• Dimension Ratio (DR) is not applicable for PE-AL-PE pipes.
• Pressure rating is not related to total wall thickness.

2. Overall Pipe Dimensions (Clause 8.1):

3. Minimum Pipe Ring Strength & Burst Pressure (Clause 10.7):

IS 15450: Key Material Specifications

1. PE Compound Characteristics (Table 3, Clause 10.3)

2. Aluminium Thickness for PE-AL-PE Pipes (Table 1, Clause 4.4)

Tolerances: +0.02 mm for all sizes.

3. Mechanical Properties (Clause 4.4)

• Minimum elongation: 20%
• Ultimate tensile strength: 100 MPa

4. Additional Notes

• No rework material is allowed in pipe manufacture (Clause 4.5).
• Testing to be done per IS 737 for mechanical properties.

This concise summary covers essential material properties, thickness specifications, and testing standards per IS 15450.

IS 15450: Pressure Rating for PE-AL-PE Pipes

Key Specifications & Tables

1. Minimum Burst Pressure (Clause 10.7, Table 4)

2. Hydraulic Pressure Test Conditions (Clause 10.8, Table 5)

IS 15450: Key Specifications & Table for Nominal Diameters

Measurement (Clause 8.2.1)

• Outside Diameter (OD) = Average of two measurements at right angles.
• Wall Thickness = Measured by dial vernier or ball-ended micrometer, rounded to nearest 0.1 mm.

Tolerances (Clause 8.1)

• Nominal OD tolerance:
  • +0.30 mm for OD ≤ 25 mm
  • -0.00 mm for OD ≥ 32 mm

Coiling (Clause 8.4)

• Minimum coil inside diameter = 20 × OD of pipe

Table 2: Overall Pipe Dimensions

Notes:

• Wall thickness

IS 15450 - Marking of Pipes: Key Points

• Marking Interval:
  Marking must be repeated every 1 meter along the pipe length.

• Mandatory Marking Information (Clause 12.1):

  • Manufacturer's name and trade-mark
  • Pipe designation (type/grade)
  • Batch or lot number

• BIS Certification Mark (Clause 12.3.1):
  Each pipe may also carry the Standard Mark (BIS mark).

• Use of Standard Mark (Clause 12.3.2):
  Governed by the Bureau of Indian Standards Act, 1986.
  Licensing conditions for using the Standard Mark are provided by BIS.

Summary Table for Marking Requirements

flowchart LR
    A[Pipe] --> B{Marking every 1 m}
    B --> C[Manufacturer's name & trade-mark]
    B --> D[Designation]
    B --> E[Batch or lot number]
    B --> F{Optional: BIS Standard Mark}

This ensures traceability, quality assurance, and compliance with IS 15450.

IS 15450 Key Specifications for Pipe Dimensions

1. Coiling Diameter (Clause 8.4)

• Minimum inside diameter of coil = 20 × Outside Diameter (OD) of pipe

2. Measurement Guidelines (Clause 8.2.1)

• OD = Average of two measurements at right angles.
• Wall thickness measured by dial vernier or ball-ended micrometer.
• Dimensions rounded to nearest 0.1 mm.

3. Pipe Dimensions (Table 2, Clause 8.1)

4. Tolerances (Clause 8.1)

• OD tolerance: +0.30 mm for OD ≤ 25 mm

IS 15450: Visual Appearance - Key Formulas, Tables & Specifications

1. Design Circumferential Stress (Clause 6.3)

[ \sigma_c = 6.3 \text{ MPa} ] Where:

• (D) = nominal outside diameter (mm)
• (d) = internal diameter with minimum wall thickness (mm)

2. Outer Polyethylene Layer Thickness (Annex B)

• Measure thickness at 6 points around circumference using a magnifying glass/microscope with reticule (accuracy ±0.10 mm).
• Ensure pipe cut is ≤ 1% out-of-roundness.
• One measurement point must be at aluminium weld.

3. Pigment Dispersion in Polyolefin Pipes (Annex C & Clause 10.4)

• Use microtome section examined under transmitted light at 100x magnification.
• Compare with standard photomicrographs.
• Acceptable grade ≤ 3.

4. PE Compound Characteristics (Table 3)

Summary Diagram: Visual Appearance Testing Process

flowchart TD
    A[Sample Selection] --> B[Cut Pipe (≤1% Out-of-roundness)]
    B --> C[Measure Outer PE Thickness (6 points)]
    C --> D[Microscopic Examination for Pigment Dispersion]
    D --> E{Pigment Dispersion Grade ≤ 3?}
    E --

IS 15450: Performance Requirements Summary

Key Performance Characteristics (Clause 10.3, Table 3)

Dimensional & Visual Requirements (Clause 10.7, Table 11.2.3)

Hydraulic Pressure Test (Clause 10.8, Table 5)

• Test temperature: 20°C and 60°C
• Test pressure varies by size (e.g., 3.20 MPa at 20°C for 912 mm pipe)
• Duration: 1 hr at 20°C, 10 hrs at 60°C

Long Term Hydrostatic Test (Clause 11.1, Table 6)

• Test temperature: 95°C
• Pressure: 0.8 to 1.3 MPa depending on pipe

IS 15450: Sampling, Frequency of Tests & Criteria for Conformity

1. Sampling for Visual & Dimensional Requirements (Clause 11.2.3.1, Table 7)

2. Sampling for Physical & Mechanical Tests (Clause 11.2.4.1, Table 8)

• Tests include: Density, MFR, Carbon Black Content/Dispersion, Pigment Dispersion, Adhesion, Apparent Tensile Strength, Minimum Burst Pressure, Hydraulic Characteristics.

3. Criteria for Conformity

• **Visual & Dimensional

IS 15450: Certification and Marking Key Points

• Marking Requirements (Clause 12.2):
  Each coil must have two labels with the following details:

  • Supplier's name
  • Manufacturing standard (e.g., IS 15450)
  • Designation (grade/type)
  • Weight of coil (kg)
  • Length of coil (meters)

• BIS Certification Mark (Clause 12.3):

  • Use of the Standard Mark follows the BIS Act, 1986 and related rules.
  • Manufacturers must obtain a licence from BIS to use the Standard Mark.
  • This mark ensures compliance with IS standards and quality assurance.

• Additional Notes:

  • Refer to BIS licensing conditions for detailed certification procedures.
  • ASTM F 1282:2001 is referenced for supplementary guidance.

Summary Table for Marking Labels

flowchart LR
  A[Coil] --> B[Attach Label 1]
  A --> C[Attach Label 2]
  B --> D[Supplier's Name]
  B --> E[Manufacturing Standard]
  B --> F[Designation]
  B --> G[Weight (kg)]
  B --> H[Length (m)]
  C --> D
  C --> E
  C --> F
  C --> G
  C --> H

This ensures traceability, quality, and compliance with IS 15450.

IS 15450 Annex A: Storage, Connectors & Fittings for PE-AL-PE Pipes

A-1.1 Outside Storage

• Store pipes on a flat surface.
• Support pipes to prevent distortion.

A-2 Connectors and Fittings

A-2.2 Internal Pressure Test (Table 9)

• Fittings/connectors assembled with PE-AL-PE pipes must not leak or fail.
• Test at ambient temperature for the specified duration.
• Pressure and duration depend on pipe size:

Notes:

• The joint must show no leakage during the test.
• Referenced standards for materials: ISO 1872-1:1993, ASTM D1248:2000, ASTM F1282:2001.

flowchart LR
    A[Storage] --> B[Flat Surface]
    A --> C[Support to Prevent Distortion]
    D[Connectors & Fittings] --> E[Assemble with PE-AL-PE Pipe]
    E --> F[Internal Pressure Test]
    F --> G{No Leakage/Failure}
    G -->|Pass| H[Accept]
    G -->|Fail| I[Reject]

Assessment of Pigment Dispersion as per IS 15450

Key Specifications:

• Pigment Dispersion Grading:

  • Tested by Annex C (Microtome Method)
  • Grading shall be ≤ 3 (Clause 10.4)
  • Examined under transmitted light at X100 magnification
  • Compared against standard photomicrographs (Annex C)

• Sample Preparation:

  • Cut pipe sample ensuring ≤ 1% out-of-roundness (Annex B-1)
  • Thickness of outer polyethylene coating measured at 6 points around circumference (Annex B-2)

• Carbon Black Content & Dispersion:

  • Tested as per IS 2530 on composite samples of minimum 3 pipes (Clause 10.3)
  • Must meet requirements in Table 3 (IS 15450)
  • Dispersion must be satisfactory

Summary Table (Pigment Dispersion Grading)

Formula Reference (Design Circumferential Stress):

[ \sigma_c = 6.3 \text{ MPa (given)} ]

Where:

• (D) = nominal outside diameter (mm)
• (d) = internal diameter with minimum wall thickness (mm)

Diagram: Sample Preparation & Measurement Points

circle
    title Pipe Cross-Section
    section Measurement Points (6)
    Point 1: Aluminium weld
    Point 2: Opposite weld
    Point 3-6: Equally spaced around circumference

In brief: Use microtomed sections, examine pigment dispersion at 100x magnification, ensure grading ≤ 3, and verify carbon black content per IS 2530 for compliance.

IS 15450: Hydraulic Pressure Test Key Points

1. Test Sample Requirements (Clause 10.8, Annex G)

• Minimum length = max(10 × outside diameter, 250 mm)
• Ends sealed with fittings, filled with water.
• Condition in temperature-controlled water bath for ≥ 2 hours at test temperature.
• Maintain test pressure ±0.07 MPa.
• Continuous pressure loss = test failure.

2. Hydraulic Test Conditions (Table 5, Clause 10.8)

3. Minimum Burst Pressure & Ring Strength (Table 11.2.3, Clause 10.7)