High-Pressure Fire Fighting Hose -Specification

IS 14933 - Scope: Key Specifications & Tables

• Internal Diameter (Clause 2.0):
  Measured by conical/cylindrical plug gauge with tolerance:
  +2.0 mm / -0.0 mm

• Standard Length:
  30 m ± 2%

• Mass of Hose per Metre (Table 1):
  Condition hose at 27 ± 2℃ & 65 ± 5% RH for 48 hrs before weighing.

• Coil Diameter (Clause 6):
  For 30 m dry hose (no couplings), max coil diameter = 52 cm

• Rounding Off (IS 2:1960):
  Final test values rounded to same significant figures as specified values.

This ensures dimensional accuracy, mass limits, and flexibility requirements for hoses under IS 14933.

IS 14933 references multiple Indian Standards and includes these key points:

• Rounding Off: Final test or calculated values must be rounded as per IS 2:1960, retaining the same significant figures as the specified value.

• Sampling Table (Clause 1.2): Sample size for conformity tests depends on lot length:

• Committee Composition: The standard was developed by the Fire Fighting Sectional Committee CED 22, comprising experts from government, industry, and research organizations.

• Standard Revision: Users should check for the latest editions of referenced standards for compliance.

Note: IS 14933 does not provide direct formulas but relies on referenced standards and sampling criteria for testing.

flowchart LR
  A[Lot Size] --> B{Sampling Size}
  B -->|Up to 15| C[All Lengths]
  B -->|16 to 25| D[15 Lengths]
  B -->|26 to 50| E[20 Lengths]
  B -->|51 to 100| F[32 Lengths]
  F --> G[1 Rejection Allowed]
  C & D & E --> H[0 Rejections Allowed]

For detailed test methods and formulas, refer to the latest editions of the standards cited in IS 14933.

IS 14933: Key Terminology, Sizes, and Specifications

• Internal Diameter (Clause 2.0):
  Measured using a conical or cylindrical plug gauge.
  Tolerance: +2.0 mm / -0.0 mm.

• Standard Length:
  30 meters ± 2%.

• Mass of Hose (Table 1):
  Maximum mass per meter length (with elastomeric coating):

• Conditioning for Mass Measurement:
  Temperature: 27 ± 2°C
  Relative Humidity: 65 ± 5%
  Duration: ≥ 48 hours

• Coil Diameter (Clause 6):
  For 30 m dry hose (no couplings), max coil diameter = 52 cm.

• Rounding Off (IS 2:1960):
  Final values rounded to the same decimal places as specified values.

flowchart LR
    A[Hose Sample] --> B[Condition at 27±2°C, 65±5% RH for 48h]
    B --> C[Measure Mass per Meter]
    C --> D[Compare with Max Mass from Table 1]
    A --> E[Measure Internal Diameter with Plug Gauge]
    E --> F[Check Tolerance +2.0/-0.0 mm]
    A --> G[Machine Coil 30m Hose]
    G --> H[Measure Coil Diameter ≤ 52 cm]

This summary covers key terms, size tolerances, and measurement protocols as per IS 14933.

IS 14933: Materials - Key Specifications & Test Setup

Material Specifications:

• Steel Cubes: Uniform size of 13.0 ± 0.1 mm for test specimens.
• Abrasive Material: Aluminium oxide cloth, grit 50 'X' weight, size 25 mm wide × 300 ± 5 mm long (IS 715 Part 2).

Test Conditions:

• Hydrostatic Pressure: Maintain steady pressure of 0.7 MPa (700 kPa / 7 kgf/cm²) using water as the test medium.
• Test Apparatus Requirements:
  • Constant pressure source with air bleed provisions.
  • Reciprocating abrading machine.
  • New abrasive strip per test.
  • Electric air blower for debris removal.

Measurement Tools:

• Stopwatch with least count of 0.2 seconds.
• Steel tongs of 30 cm length.
• Protective steel wire mesh guard.

Rounding Off Values (IS 2:1960)

• Final test values must be rounded off to the same number of significant figures as specified in the standard.

Summary Table: Test Specimen & Equipment

flowchart LR
    A[Test Apparatus] --> B[Hydrostatic Pressure Source]
    A --> C[Reciprocating Abrading Machine]
    C --> D[Abrasive Strip (Al2O3 Cloth)]
    A --> E[Air Blower]
    F[Test Specimen] --> A
    G[Measurement Tools] --> A

IS 14933: Key Construction Specifications

1. Hose Dimensions & Tolerances

• Internal Diameter: Measured by conical/cylindrical plug gauge.
• Tolerance: +2.0 mm / -0.0 mm.
• Standard Length: 30 m ± 2%.

2. Mass of Hose per Metre (Table 1)

• Conditioning for mass test: 27 ± 2°C, 65 ± 5% RH for 48 hrs.

3. Coil Diameter (Clause 6)

• Max coil diameter for 30 m dry hose (without couplings): 52 cm.

4. Sampling (Table 2)

• Sample size depends on lot length, e.g., up to 15 m: test all; 16-25 m: 15 m sample, etc.

Summary Diagram: Hose Construction Parameters

graph TD
  A[Hose Construction] --> B[Internal Diameter ±2 mm]
  A --> C[Length 30 m ±2%]
  A --> D[Mass per m (see Table 1)]
  A --> E[Max Coil Diameter 52 cm]
  A --> F[Sampling as per Lot Size]

These ensure quality and uniformity in fire hoses per IS 14933.

IS 14933 Key Specifications for Coil Diameter:

• Coil Diameter (Clause 6):
  For a 30 m length of dry hose (without couplings), the maximum coil diameter shall not exceed 52 cm when machine coiled.

  • Measured at the widest part of the coil.

• Internal Diameter (Clause 3.4):

  • Measured using a conical or cylindrical plug gauge.
  • Tolerance: +2.0 mm / -0.0 mm from the specified diameter.

• Mass of Hose per Meter (Table 1):

  Nominal Diameter (mm)	Max Mass per Meter (g)
  38	350
  50	450
  63	550
  70	650

• Reinforcement (Clause 16.1):

  • Increase in length and diameter under pressure shall not exceed 6%.

Summary Diagram of Coil Diameter Measurement:

graph LR
A[30 m Hose Length] --> B[Machine Coiled]
B --> C[Measure Diameter at Widest Part]
C --> D{Diameter ≤ 52 cm?}
D -- Yes --> E[Complies]
D -- No --> F[Reject]

This ensures hose flexibility and storage compactness per IS 14933.

IS 14933: Reinforcement Key Points

1. Reinforcement Types (Clause 8.2)

• Lining may be reinforced with fabric sheeting or other reinforcement types.
• Reinforcement improves hose strength and adhesion.

2. Adhesion Test (Clause 3.1 & 3.2)

• Test piece is turned inside out to expose lining.
• Separate lining and reinforcement just enough to attach grip.
• Attach 4 kg weight and measure length of lining separated after 1 minute.
• This ensures adequate bonding between lining and reinforcement.

3. Hose Dimensions & Mass (Clause 2.0, Table 1)

• Internal diameter tolerance: +2.0 mm / -0.0 mm.
• Standard length: 30 m ± 2%.
• Conditioning before weighing: 27 ± 2℃ and 65 ± 5% RH for 48 hours.

4. Coil Diameter (Clause 6)

• Maximum coil diameter for 30 m dry hose (without couplings): 52 cm.

Summary Diagram: Reinforcement Adhesion Test Setup

flowchart LR
    A[Test Piece] --> B[Turned Inside Out]
    B --> C[Separate Lining & Reinforcement]
    C --> D[Attach Grip + 4 kg Weight]
    D --> E[Measure Lining Separation Length after 1 min]

This ensures the reinforcement is properly bonded to the lining per IS 14933 requirements.

Hydrostatic Proof Pressure Test (IS 14933 Key Points):

• Initial Air Removal:

  • Fill hose with water at low pressure ≤ 70 KPa (0.7 kgf/cm²)
  • Use pet cock to bleed air (Clause 3.2, 16.2)

• Test Setup:

  • Hose length: 1 m clear of fittings (Clause 8.2)
  • Place hose horizontally on hard smooth surface (RCC/metalled table)
  • Free end inside guard for safety

• Pressure Application:

  • Increase pressure gradually at ≤ 1 MPa/min (10.2 kgf/cm²/min) (Clauses 8.2, 3.43)
  • Hold pressure for specified time (min 2 min at 1 MPa, 1 min at 3.43 MPa)

• Pressure Values:

  Test Type	Pressure (MPa)	Pressure (kgf/cm²)	Duration	Acceptance Criteria
  Proof Pressure Test	0.7	7	Initial fill	No air, hose filled with water
  Proof Pressure Test	1.0	10	≥ 2 min	No leakage, measure elongation
  Type Test (B only)	3.43	35	1 min	No leakage, no jacket thread break
  Burst Test	5.2	50	Until failure	No burst or leakage before this

• Measurements:

  • Mark two points ≥ 100 cm apart
  • Measure length and diameter at 0.7 kPa and 1 MPa stages (Clause 16.2)
  • Check elongation and diameter change to assess hose integrity

Summary Flowchart:

flowchart TD
    A[Connect hose to pump] --> B[Fill with water at 0.07 MPa]
    B --> C[Bleed air via pet cock]
    C --> D[Mark points ≥ 1 m apart]
    D --> E[Increase pressure to 1 MPa @ ≤1 MPa/min]
    E --> F[Hold for ≥

IS 14933: Burst Pressure Test Key Points

• Test Setup:

  • Use a hose length ≥ 1 m clear of fittings.
  • Connect to hydraulic pump with air-bleeding arrangement.
  • Fill with water, remove air at 70 kPa (0.7 kgf/cm²).

• Pressure Application:

  • Increase pressure gradually at max 1 MPa/min (10.2 kg/cm²/min).
  • Hose must withstand 5.2 MPa (50 kgf/cm²) without leakage or bursting (Clause 8.2).

• Measurement:

  • Mark two points ≥ 100 cm apart.
  • Measure length and diameter at 70 kPa and at 1 MPa after 2 minutes (Clause 16.2).

• Type B Hose Specific (Clause 3.43):

  • Apply 3.43 MPa (35 kgf/cm²) pressure.
  • Maintain for 1 minute.
  • No leakage, sweating, or jacket thread breakage allowed.

Summary Table

Procedure Flow (Mermaid.js)

flowchart TD
    A[Connect hose to pump] --> B[Fill hose with water]
    B --> C[Remove air at 70 kPa]
    C --> D[Mark two points ≥ 100 cm apart]
    D --> E[Increase pressure at ≤1 MPa/min]
    E --> F{Pressure reached?}
    F -->|5.2 MPa| G[Check for leakage/burst]
    F -->|No| E
    G --> H[Record

IS 14933 Abrasion Resistance Test: Key Specifications and Setup

Test Apparatus (Clause B-1.2)

• Hydrostatic pressure: Constant 0.7 MPa (700 kPa or 7 kgf/cm²) with water; air must be bled out.
• Abrading machine: Reciprocating movement with:
  • Frequency: 50–60 double strokes per minute.
  • Stroke length: 230 mm.
  • Downward force: 1.58 kgf (15.5 N).
• Abrasive strip: Aluminium oxide cloth, grit 50, size 25 mm × 300 ± 5 mm (IS 715 Part 2).
• Air blower: To remove abraded fluff.

Test Specimen Setup (Clause B-3.1)

• Abrading strip mounted at:
  • 45° to horizontal axis of test piece.
  • 20° to reciprocating motion direction.
• Three test pieces per test (Clause B-2.2).
• Average cycles before bursting = Abrasion resistance cycles (5 samples recommended).

Summary Table

flowchart LR
    A[Test Apparatus] --> B[Hydrostatic Pressure 0.7 MPa]
    A --> C[Reciprocating Abrading Machine]
    C --> D[Abrasive Strip (25x300 mm, Grit 50)]
    C --> E[Downward Force 1.58 kgf]
    C --> F[Frequency 50-60 double strokes/min]
    A --> G[Air Blower]
    H[Test Piece] --> I

IS 14933: Ozone Resistance Test - Key Specifications & Procedure

Test Setup (Clause 17.1 & Annex C)

• Test piece: 150 mm length of hose (per IS 3400 Part 20)
• Preparation: Turn inside out or slit lengthwise to expose lining; form into a tight coil.
• Conditioning: 27 ± 2°C, ozone-free atmosphere, dark, for 38 hours before test.

Test Conditions

Post-Test Examination

• Inspect test piece under 2× magnification lens.
• Look for cracking or crazing on the exposed lining.

Additional Notes

• Dirt removal before abrasion test: Use air blower at 100 kPa pressure, nozzle fixed, air jet at angle ≤ 300 mm distance.
• Refer to Fig. 2 for abrasion testing machine setup (dimensions in mm).

flowchart TD
    A[Test Piece Preparation] --> B[Conditioning at 27±2°C, ozone-free, dark, 38h]
    B --> C[Form coil & expose lining]
    C --> D[Ozone Exposure: 50±5 pphm, 50±2°C, 96h]
    D --> E[Examine under 2× magnification]
    E --> F{Cracking or Crazing?}
    F -->|Yes| G[Fail]
    F -->|No| H[Pass]

This test ensures the hose lining resists ozone-induced degradation under accelerated conditions.

IS 14933 - Oil Resistance Test (Clause 17.2)

Test Procedure (Clause 17.2.1):

• Test piece: 1 m length hose.
• Markings: 60 mm from each end around circumference.
• Oil bath: Oil No. 3 as per IS 3400 (Part 6).
• Temperature: 50 ± 2°C.
• Duration: 70 hours.
• Immersion: Central portion between marks fully immersed; ends clamped so marks align with oil surface.
• Post-test: Remove without oil contact beyond marks; lay horizontally.
• Inspection: Check for swelling, weathering, cracking visually on immersed portion.
• Adhesion test: Conduct as per Annex A on samples from immersed portion; must meet adhesion requirements.

Key Specifications:

Adhesion Test:

• Refer to Annex A of IS 14933 for detailed adhesion test method.
• Ensures rubber lining remains bonded after oil exposure.

flowchart LR
    A[Test Piece 1 m] --> B[Mark 60 mm from ends]
    B --> C[Immerse central portion in Oil No.3]
    C --> D[Maintain 50 ± 2°C for 70 hours]
    D --> E[Remove carefully, avoid oil contact beyond marks]
    E --> F[Visual Inspection: swelling, cracking, weathering]
    F --> G[Adhesion Test (Annex A)]

This test ensures the hose's rubber lining resists oil degradation and maintains adhesion under specified conditions.

IS 14933: Heat Resistance Test Summary

Test Setup (Annex D, Clause 17.3)

• Test pieces: 5 pieces, each 1 m length, freshly cut.
• Apparatus: Laboratory furnace controlled at 600 ± 10°C.
• Test medium: Mild steel cube heated in furnace.

Test Procedure

• Heat steel cube to 600 ± 10°C.
• Remove cube quickly (within 2 seconds) using iron tongs.
• Place cube immediately on hose test piece (avoid lap joints).
• Hold cube with light wire support.
• Record time until hose bursts.

Acceptance Criteria (Clause 17.3)

• No bursting within 20 seconds of cube application for any test piece.

Test Report Requirements (Clause 4.2)

• Date of test.
• Complete hose identification.
• Nature & location of any cracking or crazing.

Key Points:

flowchart TD
    A[Heat steel cube to 600±10°C] --> B[Remove cube within 2 sec]
    B --> C[Place cube on hose test piece]
    C --> D[Hold cube with wire support]
    D --> E[Record time until burst]
    E --> F{Burst time > 20 sec?}
    F -- Yes --> G[Test Passed]
    F -- No --> H[Test Failed]

This test ensures hose heat resistance per IS 14933 standards.

IS 14933 – Marking Specifications Summary

• Clause 19.3: Hose may carry the Standard Mark indicating compliance with IS 14933.
• Clause 19.3.1: 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.
• Rounding Off (IS 2:1960): Test results must be rounded off per IS 2:1960 rules, retaining the same number of significant digits as the specified value.
• Marking Details Typically Include:
  • Manufacturer’s name or trademark
  • Standard number (IS 14933)
  • Size and type of hose
  • Manufacturing batch or date code
  • Standard Mark (if licensed)

Key Notes on Marking:

flowchart LR
    A[Manufacture Hose] --> B{Marking}
    B --> C[Manufacturer Name/Trademark]
    B --> D[IS 14933 Number]
    B --> E[Size & Type]
    B --> F[Batch/Date Code]
    B --> G{Standard Mark?}
    G -->|Licensed| H[Apply Standard Mark]
    G -->|Not Licensed| I[No Standard Mark]

This ensures traceability, quality assurance, and compliance with IS 14933.

IS 14933: Sampling and Criteria for Conformity

1. Sampling Procedure (Clause 1.3.1 & Annex E)

• Lot size (N) and Sample size (n) are defined.
• Calculate interval:
  [ r = \left\lfloor \frac{N}{n} \right\rfloor ]
• Starting from any hose, count sequentially: 1, 2, 3, ..., r, 2r, 3r, ...
• Every r-th hose is selected for inspection/testing.

2. Criteria for Conformity (Clause 2.1.1 & Table 2)

• Refer to Table 2 for allowable defectives (d).
• If the number of defectives in the sample ≤ d, the lot conforms.
• Only conforming lots proceed to further tests.

3. Heat Resistance Test (Clause 17.3 & 3.3)

• Place a heated steel cube (max 2 sec transfer) on the test piece.
• Hold with wire support; measure time until burst.
• Burst must NOT occur within 20 seconds for any of the 5 samples.
• Use clean, new mild steel cubes; avoid lap joints.

Summary Table: Sampling and Acceptance

flowchart TD
    A[Start: Lot of N hoses] --> B[Calculate r = floor(N/n)]
    B --> C[Select every r-th hose for sample]
    C --> D[Test samples for defects]
    D --> E{Defectives ≤ d?}
    E -- Yes --> F[Lot conforms → Further tests]
    E -- No --> G[Lot rejected]
    F --> H[Heat Resistance Test]
    H --> I{Burst time ≥ 20 sec for all?}
    I -- Yes --> J[Pass