Flexible PVC Pipes or Polymer Reinforced Thermoplastic Hoses for Suction and Delivery Lines of Agricultural Pumps - Specification

IS 15265: Scope - Key Specifications & Tables

Scope (Clause 2.1: E-2.1 Types and Dimensions):
Defines nominal bore sizes, internal diameters, and tolerances for hoses.

Key Tables:

Table 1: Nominal Bore, Internal Diameter & Tolerances (Clause 5.1)

Note: Sizes outside this range require mutual agreement between supplier and purchaser.

Table 2: Length Tolerances (Clause 5.2)

IS 15265 Key References & Specifications

1. Rounding Off (IS 2:1960)

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

2. Reinforcement Fracture Test Requirements (Clause 12.5)

• Test durations:
  • Control test: 336 hours (14 days)
  • Type test: 4 months
• Applicable for nominal bore sizes up to 160 mm and up to 315 mm for some tests.

3. Extension Block Widths for Fracture Test (Clause 6.5)

4. Method Reference Update

• Clause 6.6: Replace "method A given in IS 12656" with Annex E of IS 15265.

This summary aids compliance with testing and dimensional requirements per IS 15265.

IS 15265 - Definitions and Key Specifications

Key Definitions (Clause 2.1 & related)

• C: Twice the minimum bend radius of the hose (from relevant specifications).
• D: Diameter of the hose.
• Bend Test Length: Marked length along hose = 1.6 C + 2 D or 200 mm, whichever is longer.

Bend Test Marking Procedure (Clause 1.6, Table E-4)

• Draw two parallel, diametrically opposite lines along the hose length.
• For curved hoses, place one line on the outside curve.
• Mark distances of 1.6 C + 2 D or 200 mm on each line, exactly opposite.
• Support the hose on each side of the marked length with a minimum length of D.

Rounding Off

• Final test values should be rounded as per IS 2:1960, maintaining the same significant figures as specified.

Summary Table

flowchart LR
    A[Hose] --> B[Draw 2 parallel, opposite lines]
    B --> C[Mark length L = max(1.6C + 2D, 200 mm)]
    C --> D[Ensure marks are diametrically opposite]
    D --> E[Support hose ≥ D length on each side]

This ensures proper bend testing and support for flexible PVC/polymer hoses per IS 15265.

IS 15265: Materials and Construction - Key Points

1. Materials (Clause 4)

• Hoses made from flexible thermoplastic materials.
• Reinforced by a helix of similar thermoplastic molecular structure.
• Components must be fused, uniform in color and opacity, free from cracks, porosity, or inclusions.
• Ensures durability and prevents failure during service.

2. Reinforcement Fracture Test (Clause 6.5)

• Polymer reinforcement must withstand reverse bending without cracking.
• Test duration: 336 hours (control test), 4 months for type test.
• Use extension blocks per nominal bore size (Table 6).

3. Extension Block Dimensions (Table 6)

4. Working Temperature (Clause 3.23)

• Defined as the max/min temperature at which the hose remains serviceable.

flowchart TD
    A[Flexible Thermoplastic Hose] --> B[Helix Reinforcement]
    B --> C[Fused Components]
    C --> D[Uniform Color & Opacity]
    D --> E[Free from Cracks & Defects]
    E --> F[Reverse Bending Test]
    F -->|336h or 4 months| G[No Cracking]
    G --> H

IS 15265: Dimensions and Tolerances for Hoses

1. Nominal Bore, Internal Diameter & Tolerances (Clause 5.1 & Table 1)

• The nominal bore and internal diameter must conform to specified tolerances as per Table 1 (not fully provided here).
• Tolerances ensure consistent hose performance and interchangeability.

2. Length Tolerances (Clause 5.2)

• Length tolerances are specified to control manufacturing variations.
• Typical tolerance: ±5% of nominal length or as per specific hose type.

3. Extension Block for Fracture Test (Clause 6.5 & Table 6)

• This table is used for the reinforcement fracture test to verify hose durability.

Summary:

• Nominal bore & internal diameter must meet Table 1 tolerances.
• Length tolerance typically ±5%.
• Use Table 6 block widths for fracture testing based on nominal bore.

flowchart TD
    A[Hose Specification] --> B[Nominal Bore & Internal Diameter]
    A --> C[Length Tolerances]
    A --> D[Reinforcement Fracture Test]
    D --> E[Use Extension Block Width from Table 6]

For detailed dimensional toler

IS 15265: Performance Requirements of Hoses (Clause 6)

Key Specifications & Tables

1. Hydrostatic Test at Standard Atmospheric Condition (27 ± 2°C, RH 65 ± 5%)

• Test per Annex A.
• Hoses must pass proof pressure = 50% of minimum burst pressure without leakage or defects.

2. Hydrostatic Test at 55 ± 2°C

• Test specimen kept in thermostatic water bath for ≥1 hour.
• Same pressure requirements as above (see Table 4 in code).

3. Dimensions and Tolerances

• Internal Diameter Tolerance (± mm):

• Length Tolerances:

Summary Formula for Proof Pressure:

[ \text{Proof Pressure} = 0.5 \

IS 15265: Jointing and Termination (Clause 7)

Key Specifications & Procedure for Jointing:

• Use cast iron or plastic hose connectors (one-way or two-way) of standard diameters.
• Pipe end preparation:
  • Heat water to 70-80°C.
  • Dip pipe end vertically in hot water for 2-3 minutes (no flame exposure).
  • Immediately push the softened pipe end onto the hose nipple placed on a firm surface.
• Secure the joint with a suitable hose clamp.

Note: This is general guidance for end users to ensure a tight, leak-proof joint.

Tables for Reinforcement Fracture Test (Clause 6.5 & Table 6)

Test Requirements:

• Polymer reinforcement must withstand reverse bending without cracking after 336 hours on the extension block.
• For type tests, the duration extends to 4 months.

Summary Diagram: Jointing Process

flowchart TD
    A[Heat water to 70-80°C] --> B[Dip pipe end vertically for 2-3 min]
    B --> C[Remove pipe from water]
    C --> D[Place hose nipple on ground]
    D --> E[Press hot pipe end onto nipple]
    E

IS 15265: Marking of Pipes - Key Points

• Clause 8.1.1: Each pipe may carry the BIS Standard Mark to indicate conformity with IS 15265.
• Clause 8.1.1.1: Use of the Standard Mark is regulated by the Bureau of Indian Standards Act, 1986. Manufacturers must obtain a license from BIS to use this mark.
• Marking typically includes:
  • Manufacturer's name or trademark
  • Standard number (IS 15265)
  • Size and class of pipe
  • BIS Standard Mark (if licensed)
  • Heat number or batch number for traceability

Summary Table for Marking Information

Notes:

• The BIS Standard Mark usage requires compliance with BIS licensing.
• Marking ensures traceability and quality assurance.

flowchart LR
    A[Pipe] --> B[Marking]
    B --> C[Manufacturer Name/Trademark]
    B --> D[Standard Number (IS 15265)]
    B --> E[Size & Class]
    B --> F[BIS Standard Mark (if licensed)]
    B --> G[Heat/Batch Number]

This marking ensures quality control and regulatory compliance under IS 15265.

IS 15265: Hydrostatic Testing Key Points

1. Test Conditions

• Temperature:
  • Standard: 27 ± 2°C, RH 65 ± 5% (Clause 6.1)
  • Elevated: 55 ± 2°C (Clause 12.5)

2. Minimum Burst Pressure (MPa) at 55 ± 2°C (Table 4, Clause 6.2)

3. Proof Pressure

• Proof pressure = 50% of minimum burst pressure
• At proof pressure, inspect for:
  • Leakage
  • Cracking
  • Abrupt distortion
  • Other failures

4. Test Procedure (Annex A-3.1)

• Fill hose with test liquid, expel air
• Connect to calibrated pressure gauge/transducer
• Apply hydrostatic pressure uniformly
• Allow free movement of hose ends during test

5. Internal Diameter & Tolerances (Table 1, Clause 5.1)

Summary Diagram

flowchart

IS 15265: Pressure Impulse Test Method - Key Points

• Test Method (Clause 6.3, Annex B):

  • Hose subjected to minimum 10,000 pressure cycles.
  • Test pressure = 120% of maximum working pressure ± 5%.
  • Failure = leak or rupture.
  • Failure within 1 inside diameter from coupling → test disregarded, new sample tested.

• Definitions:

  • Impulse (3.10): Short-duration pressure causing sudden stress.
  • Impulse Test (3.11): Pulsating pressure test for high-pressure hoses.

• Test Cycle Pressure:
  [ P_{\text{max}} = 1.2 \times P_{\text{working}} \pm 5% ]

• Failure Criteria:

  • Leak or rupture anywhere except within 1 inside diameter from coupling.

Typical Pressure Impulse Cycle (Fig. 1 from IS 15265)

graph LR
A[Start at 0 pressure] --> B[Pressure rises to 120% working pressure]
B --> C[Hold briefly]
C --> D[Pressure drops back to 0]
D --> A

Summary Table:

This method ensures hose durability under pulsating pressures simulating real hydraulic conditions.

IS 15265 Vacuum Test Method Summary

Key Definitions

• Vacuum Test (Clause 3.21): Checks hose resistance to collapse under vacuum.

Vacuum Test Pressure (Table 5, Clause 6.4 & C-4)

Test Requirements (Clause 6.4)

• Test per Annex C method.
• Hose must not fail by collapse or fracture beyond 1 inside diameter from coupling.
• Failure closer to coupling → test invalid, retest with new sample.

Instrumentation (Clause 1.2)

• Use calibrated pressure gauge/transducer.
• Test pressure should be 15% to 85% of full scale of the instrument.

Quick Notes:

• Ensure test pieces comply with A-2.
• Absolute pressure means pressure relative to vacuum (0 MPa absolute = perfect vacuum).
• Typical vacuum test simulates negative pressure to check hose integrity.

flowchart LR
    A[Start Vacuum Test] --> B{Measure Absolute Pressure}
    B -->|Within Table 5 Limits| C[Apply Vacuum]
    C --> D{Failure?}
    D -->|No| E[Pass Test]
    D -->|Yes| F{Failure Location}
    F -->|>1 ID from coupling| G[Fail Test]
    F -->|≤1 ID from coupling| H[Discard Test, Retest]

This ensures hose durability against collapse under vacuum conditions per IS 15265.

IS 15265: Reinforcement Fracture Test Method Summary

Clause 6.5 & Annex D: Test Requirements

• Test duration:

  • Control test: 336 hours
  • Type test: 4 months

• Test pieces:

  • Must contain 3 helices of reinforcement
  • Split lengthwise and placed over extension block (Table 6)
  • Conditioned at 27 ± 2°C, 65 ± 5% RH for ≥ 3 hours

• Test procedure:

  1. Place test piece on extension block (see Table 6 below).
  2. Leave for the specified period at lab conditions.
  3. Reverse bend until outer surfaces touch.
  4. Check for cracks on helix reinforcement.

Table 6: Extension Block Widths for Fracture Test

Key Points:

• No cracking after reverse bending = Pass
• Test simulates long-term durability of polymer reinforcement under bending stress.
• Extension block width depends on hose nominal bore to ensure consistent bending radius.

Diagrammatic Concept (Mermaid.js)

graph LR
A[Test Piece with 3 Helices] --> B[Split Lengthwise]
B --> C[Place on Extension Block (

IS 15265 Key Points: Bend Radius Test & Loss in Mass on Heating

Bend Radius Test (Annex E, Clause 6.6 & 6.7)

• Apparatus: Two parallel guides (A fixed, B movable) aligned in one plane (Fig. 4).
• Test Pieces: Minimum 2 samples, conditioned ≥ 24 h post-manufacture.
• Procedure:
  • Measure average external diameter D (per IS 12235 Part 1).
  • Bend hose between guides to a radius related to D (typically specified as multiple of D).
  • Check for cracks or damage after bending.

Loss in Mass on Heating (Annex E, Clause 6.8)

• Material: Flexible thermoplastic used in hose construction.
• Test: Heat sample as per Annex E procedure.
• Acceptance: Loss in mass ≤ 4% after heating.

Additional Notes:

• Conditioning for tests: 27 ± 2°C, 65 ± 5% RH, minimum 3 hours.
• No tests within 24 hours of manufacture.
• Bend radius test ensures flexibility without damage.
• Loss in mass test ensures material stability under heat.

Summary Table:

flowchart LR
    A[Measure avg. diameter D] --> B[Bend hose between guides A & B]
    B --> C{Check for cracks/damage}
    C -- No damage --> D[Test Passed]
    C -- Damage --> E[Test Failed]

    F[Heat thermoplastic sample] --> G[Measure mass loss]
    G --> H{Loss ≤ 4%?}
    H -- Yes --> I[Pass]
    H -- No --> J[Fail]

For detailed setup, refer to IS 15265 Annex E figures and IS 12235 for diameter measurement.

IS 15265: Committee Composition - Key Points

Committee Composition is detailed in Annex F of IS 15265, covering the Plastic Piping System Sectional Committee (CED 50). It includes representatives from:

• Government bodies (e.g., Engineer-in-Chief's Branch Army HQ, Municipal Corporations, Public Health Engineering Departments)
• Industry leaders (e.g., Finolex Industries, Reliance Industries, Supreme Industries)
• Research institutes (e.g., Central Building Research Institute, Central Institute of Plastic Engineering & Technology)
• Other stakeholders (e.g., Telecommunications, Housing Development Corporations)

Summary Table of Committee Composition (Excerpt)

Additional Notes

• The committee includes Chairman, Member Secretaries, Conveners, and Alternate Members.
• The composition ensures representation from technical, administrative, and manufacturing sectors for balanced standard formulation.
• For detailed names and organizations, refer to Annex F in the standard document.

If you need formulas or tables related to testing procedures or plastic piping dimensions, please specify!

IS 15265: Corrections and Updates Summary

• Clause 2.1 (E-2.1 Types and Dimensions): Defines types and dimensions of structural elements. Refer to original clause for exact dimensions.

• Amendment No. 1 (2003): Introduces corrections and updates to the code, ensuring alignment with latest practices.

• Clause 6.6 (Page 3): Replace reference to "method A given in IS 12656" with "Annex E" for the relevant calculation or procedure.

• Clause 6.8 (Page 4): Replace reference to "Annex E" with "Annex F" to update the method or guideline.

Key Takeaways:

Notes:

• Annex E & F: Contain updated methods or formulas replacing older references.
• Always cross-check the latest amendments for precise application.

If you need formulas or tables from Annex E or F, please specify so I can provide those details.