FIRE FIGHTING HOSE COUPLING / Fire Fighting Hose

Technical Standards for Heavy-Duty Crimping & Assembly

One: Overview of the Crimping Process

In high-pressure fire suppression systems, the integrity of the connection between the

Fire Fighting Hose and its Coupling is paramount. "Crimping" (or Swaging) is the mechanical process of using a specialized machine to compress a high-strength sleeve or ferrule around the hose and the coupling shank.

Unlike traditional wire-binding, professional crimping ensures a 360-degree uniform seal that can withstand extreme hydraulic shocks and external mechanical stress.

Two: Essential Components

❶The Hose: Typically a rubber-lined or polyurethane-lined textile jacket hose designed for high working pressures.

❷The Coupling: Heavy-duty aluminum, brass, or stainless steel fittings (e.g., Storz, NH, or Camlock).

❸The Ferrule/Sleeve: A high-ductility metal cylinder that undergoes permanent deformation during the crimp.

Three: Technical Specifications & Calculations

The success of a crimp is determined by the Crimp Diameter (Dc). This is calculated based on the wall thickness of the hose and the dimensions of the

Coupling.

Four: Step-by-Step Assembly Procedures

❶Preparation and Cutting

The hose must be cut square to ensure it seats perfectly against the shoulder of the

coupling. Any frayed edges of the textile jacket should be trimmed or heat-sealed.

❷Insertion and Alignment

The ferrule is placed over the hose, and the coupling shank is inserted. It is critical that

the hose is pushed fully to the "stop" to prevent the coupling from blowing off under

pressure.

❸The Crimping Operation

Using a multi-segment hydraulic crimping machine, pressure is applied until the ferrule

reaches the predetermined target diameter. This creates a "cold weld" effect where the

hose material is compressed into the serrations of the coupling shank.

Five: Safety Standards and Testing

All crimped fire hose assemblies must undergo rigorous validation to meet international

safety protocols (such as NFPA 1961 or EN 14540):

❶Hydrostatic Proof Test: The assembly is tested at 2× its rated working pressure

to ensure no leakage or slippage.

❷Visual Inspection: Checking for "fins" or cracks in the ferrule, which indicate over-

crimping or die misalignment.

❸Pull-off Resistance: Ensuring the mechanical grip can handle the weight of a water-filled hose being dragged across rough terrain.

Six: Client Cases

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