Tuesday, December 2, 2014
STAMPED - M (Material)
Some applications require specialized oils or chemicals to be conveyed through the system. Hose selection must ensure compatibility of the hose tube, cover, couplings and O-rings with the fluid used. Additional caution must be exercised in hose selection for gaseous applications where permeation can occur. Permeation, or effusion, is seepage through the hose resulting in loss of fluid. This may occur when hose is used with fluids such as (but not limited to): • Liquid and gas fuels • Refrigerants • Helium • Fuel oil • Natural gas Consider whether there are potential hazardous effects of permeation through the hose, such as explosions, fires, and toxicity. Refer to applicable standards for specific applications such as fuels and refrigerants. If gas permeates through the tube, consider pin-perforated covers to prevent gas build-up under the cover. Also consider the compatibility of the system fluid not only with the tube, but also with the braid, cover, fittings, and other components since permeation may expose the entire hose assembly to the system fluid.