High-Pressure Fire Hose Delivery Couplings -Specification

IS 15051: Scope - Key Specifications & Tables

• Scope: Covers delivery hose couplings for firefighting, specifying materials, dimensions, workmanship, and testing.

1. Material Specification

• Stainless steel for couplings shall conform to Grade I or IV of IS 3444.

2. Sizes & Dimensions (Clause 5, Table 1)

IS 15051 Key References, Tables & Specifications

1. Referenced Standards

• Copper Alloys:
  • Sand Castings: Grade LTB 2 (IS 318) or HTB 1 (IS 304)
  • Die Castings: Grade 3 (IS 291)
  • Hot Forgings: DCB 1 (IS 291)
  • Gravity Die Castings: IS 1264
• Stainless Steel: Grade I or IV of IS 3444
• Washer: Type A of IS 937
• Rounding Off: IS 2:1960 rules for numerical rounding

2. Coupling Dimensions (Table 1, Clause 5)

IS 15051: Terminology & Key Specifications Summary

1. Rounding Off Values

• Follow IS 2:1960 for rounding off test or analysis results.
• Retain the same number of significant digits as specified values.

2. Material Specification

• Stainless steel for hose delivery couplings: Grade I or IV of IS 3444.

3. Sizes & Dimensions of Delivery Hose Couplings (Clause 5)

• Available sizes: 38 mm, 50 mm, 63 mm, 70 mm.
• Dimensions conform to Table 1 and Figures 1 & 2.

IS 15051 - Materials: Key Specifications and Tables

1. Copper Alloys (Clause 4.1.1)

2. Aluminium Alloys (Clause 4.1.2.1)

• Must be die casted only.
• Conform to IS Designations 4250, 4450, 4600 of IS 617.
• Exposed surfaces: Anodized finish.
• Threaded parts: Coated with molybdenum-based grease for corrosion protection.

3. Additional Materials

• Corrosion-resistant alloy steel and nickel base castings: Refer IS 3444:1987 for general applications.

Summary Table for Copper Alloy Grades:

flowchart TD
    A[Materials] --> B[Copper Alloys]
    B --> B1[Sand Castings: IS 318 LTB 2 / IS 304 HTB 1]
    B --> B2[Die Castings: IS 291 Grade 3]
    B --> B3[Hot Forgings: IS 291 DCB 1]
    B --> B4[Gravity Die Castings: IS 1264]
    A --> C[Aluminium Alloys]
    C --> C1[Die Casted only]
    C --> C2[IS 617: 4250

IS 15051: Shape and Dimension of Hose Delivery Couplings

Sizes Available

• 38 mm, 50 mm, 63 mm, 70 mm

Key Dimensions (All in mm) — Table 1 Summary

Additional Specifications

• Material: Stainless steel couplings must conform to Grade I or IV of IS

IS 15051: Key Construction Specifications and Tables

1. Materials for Castings and Forgings (Clause 4.1.1)

• Copper Alloys:
  • Sand Castings: Grade LTB 2 (IS 318) or HTB 1 (IS 304)
  • Die Castings: Grade 3 (IS 291)
  • Hot Forgings: DCB 1 (IS 291)
  • Gravity Die Castings: IS 1264
• Stainless Steel (Clause 4.1.3):
  • Grade I or IV of IS 3444 for hose delivery couplings

2. Dimensions of Delivery Hose Couplings (Clause 5, Table 1)

IS 15051: Workmanship and Finish - Key Points & Table

7. Workmanship and Finish (Clause 7):

• All fittings must have good workmanship and finish.
• Must be free from burns, sharp edges, porosity, blow holes, scales, cracks, and other imperfections.
• No repairs or fillings to hide defects.
• Waterway surfaces must be smooth.

Material Specifications:

• Aluminium alloys: Die cast only, per IS 617 (Designations 4250, 4450, 4600), anodized finish, threaded parts coated with molybdenum grease.
• Stainless Steel: Grade I or IV as per IS 3444.
• Washer: Type A of IS 937.

Hydraulic Test (Clause 8):

• Pressure: 35 kgf/cm²
• Duration: 2.5 minutes
• No leakage or sweating allowed after machining and assembly.

Table 1: Dimensions of Hose Delivery Couplings (mm)

IS 15051 - Hydraulic Test for Fire Hose Delivery Couplings

• Test Pressure: 35 kgf/cm² (approximately 3.43 MPa)
• Duration: 2.5 minutes (150 seconds)
• Acceptance Criteria: No leakage or sweating observed during or after the test.
• Test Timing: After completion of all machining and screwing operations.

Summary Table for Hydraulic Test

Additional Specifications

• Couplings must conform dimensionally to Table 1 (Clause 5).
• Material for stainless steel couplings: Grade I or IV as per IS 3444.
• Washers must conform to Type A of IS 937.
• Workmanship: Smooth finish; no defects or repairs hiding casting flaws.

flowchart TD
    A[Manufacture Coupling] --> B[Complete Machining & Screwing]
    B --> C[Apply Hydraulic Pressure 35 kgf/cm²]
    C --> D{Duration 2.5 min?}
    D -->|No| C
    D -->|Yes| E{Leakage or Sweating?}
    E -->|Yes| F[Reject Coupling]
    E -->|No| G[Pass Coupling]

This ensures coupling integrity under high-pressure fire-fighting conditions as per IS 15051.

IS 15051 - Marking Specifications (Clause 9)

9.1 Mandatory Marking on Each Fitting:

• Manufacturer's name and trade-mark
• Size (where applicable)
• Year of manufacture

9.2 BIS Standard Mark:

• Each fitting may also carry the BIS Standard Mark.
• Use of this mark is governed by the Bureau of Indian Standards Act, 1986.
• License conditions for use of the Standard Mark must be obtained from BIS.

Summary Table for Marking Requirements

Notes:

• Marking must be separate, clear, and permanent.
• Follow IS 2:1960 for rounding off numerical values on markings.
• For licensing and detailed BIS mark usage, contact Bureau of Indian Standards.

flowchart TD
    A[Fitting] --> B[Mark Manufacturer's Name & Trade-mark]
    A --> C[Mark Size (if applicable)]
    A --> D[Mark Year of Manufacture]
    A --> E{Use BIS Standard Mark?}
    E -->|Yes| F[Obtain BIS License]
    E -->|No| G[No BIS Mark]

This ensures traceability, authenticity, and compliance with IS 15051.

IS 15051 - Clause 9.2: BIS Standard Mark

• Purpose: The Standard Mark certifies conformity to IS 15051 and is governed by the Bureau of Indian Standards Act, 1986.
• Usage: Manufacturers may mark each fitting with the BIS Standard Mark only after obtaining a license from BIS under the Act.
• License Conditions: Details on licensing and conditions for use of the Standard Mark are available from BIS directly.
• Legal Protection: The Standard Mark is copyrighted and its unauthorized use is prohibited.

Key Points on Standard Mark:

Reference:

• For official licensing and mark usage, consult BIS publications or contact BIS Regional Offices.

flowchart LR
    A[Manufacturer] -->|Applies for License| B[BIS]
    B -->|Issues License| A
    A -->|Marks Product| C[Product with BIS Standard Mark]
    C -->|Confirms Quality| D[Consumer/Market]

This ensures product quality and compliance with IS 15051 through BIS certification.