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• c . • ` "Wool SAFETY INFO - page 4 _ ANHYDROUS AiiNQiONIA HOSE INSPECTIONS In order to know how to check a hose it is necessary to know a little about how hose is made. It varies but basically it's a six step process. 1. An inner tube is extruded or wrapped on a mandrel. 2. A ply of reinforcing material is wrapped around the tube. 3. A layer of rubber stock (frictioning material) is placed over the reinforcing material. 4. A second reinforcing layer is wrapped on the carcass. 5. An outer cover is placed over the reinforcement. 6. Internal pressure and external heat is applied to the hose to vulcanize it into a unit. The inner tube contains, the reinforcing material gives it strength and the cover protects the first two from the elements. When inspecting, check to see that the cover is intact and unbroken. Feel the hose from end to end to detect lack of adhesion. A soft spongy feel is indicative. Kinking can be detected by a reduced cross section diagonally at a 450 angle. Watch for a flattening out of the hose denoting being run over. Make sure the outer cover is intact. Any wear that goes into the braid is very dangerous. Hose is reinforced with textile braid (rayon, nylon, or Kevlar) or stainless steel braid. Both are satisfactory but have limitations. With good care a ` fabric reinforced hose has a life expectance of about three years. Under limited use conditions it may be safe for five seasons if it is removed from the rack and stored indoors. Stainless steel braided hose is more expensive but should have a longer life. In addition to a visual and manual inspection it can be hydrostatically tested. Test to 13z times the working pressure or 500 psi. Test at the beginning of each season or anytime a visual examination indicates the hose may have been damaged. Chemical Sales Services August 19, 1977 I