2.Liquidresistance: immerse a sample of ventilation hose in #120 gasoline at a roomtemperature of 23+/-2 Celsius degrees, weight change of the sample after 24hwas not greater than +/-10%.3.Gas permeation test: take a ventilation hosewith length of 900mm, feed propane-containing gas in concentration of more than98% into the ventilation hose, then exert pressure of 55.99kPa in the sample,after ventilating for 24h, and measure the gas amount permeating the sample in6h, keep it no more than 5ml/h.
1.Air tightness: while conducting an air tightness test under pressure of 0.1MPa, keep the ventilation hose from air leakage for 1min.2.Hydraustatic performance: under environment temperature of 23+/-2 Celsius degrees, the hydraustatic performance meets regulations of form 1.
Common causes of swelling and fracturing in use of PU hose
Notes for assembly and use of PU hose
1.Conduct visual inspection or test to check whether the external diameter and external diameter of PU hose meet standards of size marked on the hose, wall thickness of cross section at the ends of PU hose should meet standards of size marked on the hose. Wall thickness calculating formula is (external diameter-internal diameter)/2=wall thickness, the size error standards comply with the state or industry requirements.