IS 15811 — Long-range water-cum-foam monitor with self-inducting, aspirating and non-aspirating jet and spray/fog nozzle forfire fighting -Specification

IS 15811: Scope - Key Specifications & Tables

Scope: Covers performance, construction, and testing of water foam monitors used in firefighting.

Key Performance Requirements (Clause 9)

• Test Pressure: 0.7 N/mm² at monitor inlet flange.
• Induction Rate:
  • 3% induction: 3–4% actual
  • 6% induction: 6–7% actual
• Expansion Ratio:
  • Non-aspirating: ≥ 1:4
  • Aspirating: ≥ 1:6 (measured per IS 4989)
• Spray/Fog Angle: Minimum 120°
• Flow Tolerance: Total flow ±5%, induction rate as above.
• Jet Ratio Controller Test: Hydraulic test at 2.3 N/mm² for 5 min, no leakage (Clause 8.2).

Table 2: Minimum Performance Requirements (Excerpt)

Note: For aspirating types, reduce reach by 10%.

Construction Materials (Table 1 Highlights)

Summary Diagram: Monitor Testing & Performance

flowchart LR
    A[Water Foam Monitor] --> B[Test at 0.7 N/mm²]
    B --> C{Parameters}
    C --> D[Flow & Induction Rate]
    C -->

IS 15811 - Referenced Indian Standards: Key Points

• Clause 12.2.1 governs the use of BIS Standard Mark as per the Bureau of Indian Standards Act, 1986.
• ANNEX A lists Indian Standards referenced in IS 15811, critical for materials, dimensions, and specifications.

Rounding Off: As per IS 2:1960, numerical values must be rounded off maintaining the same significant figures as specified.

Summary Diagram of Reference Flow

graph LR
A[IS 15811] --> B[Material Specs]
A --> C[Dimensions & Tolerances]
A --> D[Marking & Certification]
B --> IS5[IS 5:2004 Paint Colors]
B --> IS28[IS 28:1985 Bronze]
C --> IS1732[IS 1732:1989 Steel Bars]
D --> BISAct[BIS Act 1986]

For detailed specifications, consult each referenced IS document via BIS website or offices.

IS 15811: Terminology and Definitions - Key Points

• Rounding Off (IS 2:1960): Final test or calculation values must be rounded to the same significant figures as the specified values in the standard.

• Leakage Test (Clause 8.2): Jet ratio controller (if present) is hydraulically tested at 2.3 N/mm² for 5 minutes with no leakage allowed.

• Performance Requirements (Clause 9):

  • Test pressure: 0.7 N/mm² at monitor inlet flange.
  • Flow and foam induction rate:
    • Induction rate for 3% requirement: 3% to 4%
    • Induction rate for 6% requirement: 6% to 7%
  • Expansion ratio (per IS 4989):
    • Non-aspirating: min 1:4
    • Aspirating: min 1:6
  • Spray/fog angle: minimum 120°
  • Flow tolerance: total flow within +5% / -0%

• Minimum Horizontal Reach & Flow Capacity (Table 2):

Note: Aspirating type reach is 10% less than values above.

• Paint Color: Fire red as per IS 5 shade No. 536 or 538; paint to conform to IS 2932.

Summary Diagram of Performance Parameters

flowchart LR
    A[Water Foam Monitor] --> B[Inlet Pressure: 0.7 N/mm²]
    B --> C[Flow Rate: Specified LPM]
    C --> D[Induction Rate: 3-

IS 15811: Materials of Construction for Water Foam Monitors

Key Specifications (Clause 4.1 & Table 1)

Additional Notes

• Material selection must consider compatibility between purchaser and manufacturer.
• Steel parts in contact with water: hot dip galvanized ≥ 0.03 mm thickness.
• Aluminium parts in contact with water: hard anodized ≥ 0

IS 15811: Construction & Design Requirements for Water Foam Monitors

Key Specifications & Materials (Clause 4.1, Table 1)

Construction & Operation (Clause 5.3)

• 100-150 NB monitors: Worm and worm wheel type for vertical & horizontal traversing.
• 63-80 NB monitors: Manual lock

IS 15811: Workmanship and Finish (Clause 6) Key Points

• Good workmanship and finish: All assemblies must be free from burns, sharp edges, and defects.
• Smooth waterway finish: Essential to reduce friction loss and ensure efficient flow.
• Material & Surface Treatment:
  • Steel parts in contact with water: Hot dip galvanized (min. 0.03 mm thickness).
  • Aluminium parts: Hard anodized (min. 0.015 mm thickness).
• Leakage Testing (Clause 8.2):
  • Jet ratio controller tested hydraulically at 2.3 N/mm² for 5 min with no leakage.
• Performance (Clause 9 & Table 2):
  • Monitor tested at 0.7 N/mm² pressure.
  • Spray/fog angle ≥ 120°.
  • Induction rate: 3-4% (for 3% requirement), 6-7% (for 6% requirement).
  • Expansion ratio:
    • Non-aspirating ≥ 1:4
    • Aspirating ≥ 1:6 (per IS 4989).
  • Effective reach (water and foam) given by Table 2, with aspirating type reach 10% less.

Table 2: Minimum Performance Requirement (Excerpt)

Summary Diagram: Workmanship & Finish Flow

flowchart TD
    A[Assembly Fabrication] --> B[Check for Burns & Sharp Edges]
    B --> C[Smooth Finish on Waterway]
    C --> D[Apply Anti-Corrosive Treatment]
    D --> E[Hot Dip Galvanizing / Hard Anodizing]
    E --> F[Leakage Testing at 2.3 N/mm²]
    F --> G[Performance Testing at 0.7 N/mm²]
    G --> H[Verify Induction & Expansion Ratios

IS 15811: Anti-Corrosive Treatment (Clause 7) Summary

• Steel components in direct water contact:

  • Must be hot dip galvanized after fabrication.
  • Minimum zinc coating thickness: 0.03 mm.
  • Thickness measured by suitable thickness meter.

• Aluminium parts in direct water contact:

  • Must be hard anodized.
  • Minimum anodizing thickness: 0.015 mm.

• Sea water use restriction:

  • Aluminium and carbon steel parts shall not be used due to corrosion risk.

Additional Notes from IS 15811:

Why this matters:

• Hot dip galvanizing provides zinc sacrificial protection to steel, preventing rust.
• Hard anodizing increases corrosion resistance and surface hardness of aluminium.
• Avoiding aluminium and carbon steel in seawater prevents rapid corrosion.

Quick Visual Summary:

flowchart TD
    A[Steel Components] -->|Hot dip galvanize| B[Zinc Coating 0.03 mm]
    C[Aluminium Parts] -->|Hard anodize| D[Anodize Coating 0.015 mm]
    E[Sea Water Use] -->|No| F[Aluminium & Carbon Steel parts]

For detailed corrosion protection, always verify coating thickness with calibrated meters and ensure compliance with IS 15811 Clause 7.

IS 15811: Leakage Testing & Performance of Water Foam Monitors

Leakage Testing (Clause 8)

• Hydraulic Pressure: 2.3 N/mm² for 5 minutes.
• Test Procedure:
  • Rotate horizontally 5 times clockwise and 5 times anti-clockwise.
  • Rotate vertically up and down for 5 cycles.
• Acceptance: No leakage in any swivel joints or assembly parts.
• Jet Ratio Controller (if provided): Tested separately at 2.3 N/mm² for 5 minutes with no leakage.

Performance Requirements (Clause 9 & Table 2)

• Test Pressure: 0.7 N/mm² at monitor inlet flange.
• Flow & Induction Rate:
  • Total flow = flow + induction rate.
  • Induction rate: 3-4% for 3% requirement; 6-7% for 6% requirement.
• Expansion Ratio:
  • Non-aspirating: ≥ 1:4
  • Aspirating: ≥ 1:6 (measured per IS 4989)
• Spray/Fog Angle: Minimum 120°
• Effective Reach: Overall reach minus 5%.
• Water & Foam Reach (m) at 30° nozzle elevation:

Note: For aspirating types, reduce reach by 10%.

Summary Diagram: Leakage Test Procedure

flowchart LR
    A[Start Hydraulic Test] --> B[Apply 2.3 N/mm² pressure for 5 min]
    B --> C[Rotate Horizontally 5x CW & 5x CCW]
    C --> D[Rotate Vert

IS 15811: Performance Requirements for Water Foam Monitors

Key Specifications (Clause 9 & Table 2)

• Test Pressure: 0.7 N/mm² at monitor inlet flange for flow, induction, and reach tests.
• Induction Test: Use water.
• Expansion & Foam Jet Reach Test: Use foam concentrate.
• Spray/Fog Angle: Minimum 120°.
• Flow Tolerance: Total flow within +5% / -0%.
• Induction Rate:
  • 3% induction: 3% to 4% actual
  • 6% induction: 6% to 7% actual
• Expansion Ratio:
  • Non-aspirating: ≥ 4:1
  • Aspirating: ≥ 6:1 (per IS 4989)
• Paint: Fire red shade No. 536 or 538 (IS 5), paint per IS 2932.

Table 2: Minimum Performance Requirements

Note: Aspirating types have 10% less reach than above.

Leakage & Hydraulic Testing (Clause 8.1 &

IS 15811: Marking Requirements for Water Foam Monitors

Key Marking Specifications (Clause 12.1)

Each water foam monitor must be clearly and permanently marked with:

• Manufacturer's name and trade-mark
• Nominal size (mm)
• Serial number
• Year of manufacturing
• Maximum working pressure (N/mm²)
• Flow at specified pressure and foam concentrate induction rate

BIS Certification Mark (Clause 12.2)

• The monitor may bear the BIS Standard Mark.
• Use of the Standard Mark is governed by the Bureau of Indian Standards Act, 1986.
• Licensing conditions for the Standard Mark are available from BIS.

Rounding Off (General Clause)

• Test results and values must be rounded off as per IS 2:1960.
• Retain the same number of significant digits as specified in the standard.

Summary Table for Marking Details

For licensing and use of BIS mark, contact BIS regional offices listed in the standard.

flowchart TD
    A[Water Foam Monitor] --> B[Permanent Marking]
    B --> C[Manufacturer Name & Mark]
    B --> D[Nominal Size (mm)]
    B --> E[Serial Number]
    B --> F[Year of Manufacture]
    B --> G[Max Working Pressure (N/mm²)]
    B --> H[Flow & Foam Induction Rate]
    B --> I[BIS Standard Mark (optional)]

Note: Refer IS 2:1960 for rounding rules when reporting test values.

IS 15811: Accessories - Key Specifications & Tables

1. Accessories Specification:

• Nozzle spanner is mandatory accessory.
• Water foam monitor must be painted fire red (Shade No. 536 or 538 as per IS 5).
• Paint shall conform to IS 2932.
• Jet ratio controller (if provided) must be hydraulically tested at 2.3 N/mm² for 5 min with no leakage.

2. Material of Construction (Table 1):

IS 15811 - Certification Marking (Clause 12.2 & 12.1)

• Certification Marking: Use of the BIS Standard Mark on monitors is governed by the Bureau of Indian Standards Act, 1986, and related rules.
• Conditions for License: Manufacturers must obtain a license from BIS to use the Standard Mark. Details are available from BIS offices.
• Mandatory Markings on Water Foam Monitors (Clause 12.1):
  • Manufacturer's name and trade-mark
  • Nominal size (in mm)
  • Serial number
  • Year of manufacture
  • Maximum working pressure (N/mm²)
  • Flow at specified pressure and foam concentrate induction rate

Summary Table for Marking Requirements

Notes:

• Markings must be clear and permanent.
• Rounding off numerical values follows IS 2:1960.

For licensing and detailed conditions, contact BIS regional offices listed in the standard.

flowchart LR
    A[Manufacturer] --> B[Apply for BIS License]
    B --> C{License Granted?}
    C -->|Yes| D[Use BIS Standard Mark]
    C -->|No| E[No Marking Allowed]
    D --> F[Mark product with:]
    F --> G[Name & Trade-mark]
    F --> H[Nominal Size (mm)]
    F --> I[Serial Number]
    F --> J[Year of Manufacture]
    F --> K[Max Working Pressure (N/mm²)]
    F --> L[Flow & Foam Induction Rate]

This ensures compliance with IS 15811 certification marking requirements.

IS 15811: List of Referenced Indian Standards

The standard references multiple Indian Standards critical for materials and components used in firefighting and related engineering fields. Key referenced IS include:

Important Notes:

• The Standard Mark usage is governed by the BIS Act, 1986 (Clause 12.2.1).
• For detailed specifications, always refer to the latest edition of each referenced IS.
• Rounding of values should comply with IS 2:1960.

Summary Diagram (Mermaid.js)

graph TD