Assembly

Introduction

Hose assemblies basically consist of a length of hose into which are fitted the required end fittings/coupling arrangement, then secured in place with a swaged ferrule.

Swaging

This is the process used to secure end fittings into the hose and is achieved by one of two methods.

External swage.

This is the process of compressing the ferrule onto the hose by means of a multi-segmented die, this in turn compresses the hose onto the insert causing the hose material to flow into the recesses in both ferrule and insert providing a secure mechanical bond.

Note: In the case of Fireshield 5000 hose assemblies a double swage ferrule process is used, where an outer ferrule is fitted to secure firetape in position around the insert retaining ferrule.

Internal swage.

This is the process of expanding the insert into the hose body by pulling a hardened former (commonly known as a dolly) through the insert, this in turn compresses the hose into the ferrule causing the hose material to flow into the recesses in both ferrule and insert providing a secure mechanical bond.

In both cases the bond is augmented by an additional mechanical interlock between the ferule and insert.

Fireshield Swaging example:-

Fireshield 5000 hoses are assembled differently to other hoses as they have 2 ferrules with 2 layers of fire tape in between.

STEP 1 : Skive away the hose outer cover down to the wire reinforcement for the length of the inner ferrule

STEP 2 : Swage the inner ferrule and insert into position

STEP 3 : Apply two layers of fire tape over the inner ferrule

STEP 4 : Fit and swage outer ferrule into position