UL 19G:2018-08 Guidance for Lined Fire Hose and Hose Assemblies

UL 19G:2018-08 Guidance for Lined Fire Hose and Hose Assemblies. 1.1 This document is to inform users of fire hose and UL 19, Lined Fire Hose and Hose Assemblies, the intent behind the test results from the radiant heat test and conductive heat test. This includes the history of the method development and the final choice of parameters used in the test methods. 1.2 It is important to note that the results from the radiant heat test and conductive heat test represent a specific set of test parameters that are not intended to represent the dynamic fire environment. 2 Radiant Heat and Conductive Heat Test Results Note — The language found in UL 19G is a duplicate of the language in UL 19, Appendix C. 2.1 The results reported in terms of time to pressure loss and leakage rate relate only to the specific set of parameters used for testing. These values can only be used to compare new hose performance against one another under the specific test conditions in the method. The results are not intended to represent actual hose performance in the fire environment, which is continually changing. Hoses may perform differently under several conditions including, higher or lower heat fluxes, higher or lower temperatures, higher or lower pressures, age of hose, wear of hose, if hose is wet or dry, charged or uncharged, and other fire environment variables. In addition it should also be noted that these test methods utilize a small section of hose and not a complete hose that may be stretched out through a fire environment. All of the aforementioned factors have the potential to change both the time to pressure loss and leakage rate. As such, the results reported in this section are intended to be used as a baseline for comparative purposes only and not assumed performance in the field. The results reported for these tests contain the following: • Radiant heat exposure of 30 kw/m2 — this represents the static heat flux used for the test method • Conductive heat exposure with steel block at 400°C (752°F) — this represents the temperature of the steel block upon removal from the oven and placement on the hose for this test method • Exposure duration — this represents the time to a 20 psi pressure loss in the static pressurized sample being tested • Average leakage rate — This represents the average leakage...