Using Propane Safely e-learning reference material

Guide Book Series

Hoses

Hoses The weakest link in the system

Operators must not make up their own hose assemblies. Also….operators must not repair worn hoses by cutting away the damaged section of the hose and then replacing the connections with worm drive screws.

Hoses are constructed to carry pressurised gas from the regulator to the point of use and are probably the item that purchasers of gas control equipment consider least. Often they are the item that will receive the most abuse and wear. There can be no question that hoses are the “weakest link” in most systems, and often receive the least attention. All hoses used to carry pressurised gas require strength and rigidity in order to prevent damage, which could result in leaks. Each type of hose has a maximum working pressure which must never be exceeded.

If hoses are repaired they must be tested to the relevant European Standard.

If you discover a hose fitted with one or more worm drive screws, remove it from the regulator and replace it with a new hose that is manufactured to the correct European standard. Unlike regulators here is no specific life or exchange interval for hoses. They should be visually inspected each time prior to use and replaced when they are damaged, contaminated or show signs of deterioration. The connectors on high pressure propane hose should be secured with swaged or crimped clips. Operators should always select a hose that is the correct length for the job in hand. A hose that is too long is not only a trip hazard but will also reduce the pressure of gas being fed into thapplication.

High pressure hoses for use with propane are orange and are manufactured to BS 3212-2 or BS EN 1256 which is the standard for welding and allied processes. Hoses are designed and manufactured to be used with specific gases. Always use the correct colour of hose…..never interchange them.

Operators should always use the correct sized spanner to connect the hose to the regulator or flashback arrestor.

It should be noted that butane or low pressure LPG hose is coloured black. This hose is rated for a maximum working pressure of only 50 millibars. Don’t use low pressure LPG hose for high pressure propane applications.

Operators need to protect hoses from heat, mechanical damage, sparks, oil or grease.

Many operators make up their own hose assemblies by cutting a length of hose from a hose reel and then attaching assemblies with worm drive screws. This is bad practice and should not be undertaken.

Reusable worm-drive clamps must not be used.

28 16

17