DARSON’S TECHNICAL TIPS FOR HOSE SELECTION AND MAINTENANCE
Before selecting a hose, Darson suggests considering the “STAMP” series of question.
Size and coupling styles:           are needed to assure efficient safe transfer of product?
Temperature :                            What is the temperature of the material that will be transferred?
A pplication:                              What is the application the hose will be used in?
Material :                                   What type of product will be transferred through the hose?
Pressure :                                   What working pressure will the hose be used at?
Does your hose require vacuum service?

You can extend the life of your hose by…
Choosing the appropriate hose for the job. In addition to multipurpose hoses, Darson offers hoses that are specifically designed for critical applications.
-Selecting the proper length of hose and keeping the hose from high traffic areas.
-Inspecting the hose before each use especially in critical applications. Inspect for coupling movement, kink, cover perforations, soft sports or any other visible damage.
-Storing the hose in a cool, dry place off of the ground. Hose should be kept out of direct sunlight.
-Draining and cleaning the hose after each use.
-Pressure testing each hose at 150% of its working pressure at regular intervals. Testing intervals will depend on frequency and critical nature of the application. Monthly testing is recommended for continuous service, quarterly for normal service, and annually for light service.

You will reduce the life of your hose by…
-Using the hose to move materials it wasn’t designed for.
-Exceeding the hose’s maximum working temperature and pressure.
-Leaving product trapped in the hose for prolonged periods of time.
-Exceeding the hose’s minimum bend radius. Use proper adaptors where necessary. For optimum hose life, avoid dragging hose over rough surfaces.

Safety
Special note: Working pressures are recommended in accordance with RMA design safety factors at ambient temperatures. Do not operate outside hose temperature limits. Even within hose temperature limits, end fittings and hose size can impact performance at higher temperatures. For your safety, Darson recommends the following working pressure reduction at the following temperatures.
80º to 150º F. - Reduce working pressure by 15%. 150º to 225º F. – Reduce working pressure by 30%. Over 225º F. – Reduce working pressure by 50%.
Darson Industries continually strives to make design and material improvements in its hoses and reserves the right to change specifications without prior notice..