UL 92-2020 pdf download – Fire Extinguisher, Booster, and Noncollapsible Standpipe Hose and Hose Assemblies.
6.2 The internal diameter is to be measured using (1) a tapered plug gauge having a taper of 3/8 inch per foot (31 mm/m), marked to indicate variations of 1/64 inch (0.4 mm) in diameter, or (2) a set of plug gauges, step, straight, or ball type, in increments of 0.005 inches (0.13 mm). 6.3 The end of the hose is to be cut square. If a tapered plug gauge is used, the plug gauge is to be inserted into the hose sample until a close fit is obtained without forcing. The diameter of the gauge at the end of the sample, to the nearest 1/64 inch (0.4 mm), is to be recorded as the internal diameter of the hose. If a set of step, straight, or ball-type plug gauges is used, the diameter of the gauge, that when inserted into the hose sample gives a close fit without forcing, is to be recorded as the internal diameter of the hose. 7 Couplings 7.1 A hose coupling shall be made of corrosion resistant material. See Salt Spray Corrosion Test, Section 22. PERFORMANCE 8 Elongation and Contraction Test 8.1 General 8.1.1 The change in length of the hose or hose assembly, when pressurized from 10 psig (69 kPa) to the maximum working pressure, shall be plus 4 to minus 6 percent for sizes less than 3/4 inch (19.1 mm) and plus 6 to minus 0 percent for sizes 3/4 inch and larger. 8.2 Apparatus 8.2.1 The hydrostatic equipment specified in Methods of Testing Rubber Hose, ASTM D380-94, is to be used for this test. 8.2.2 The necessary equipment and facilities are to include a test surface or the equivalent that will provide a clear space at least 20 inches (508 mm) wide on each side of a line drawn through the center of the supply connection and parallel to the edges of the test surface. 8.3 Method 8.3.1 Samples are to consist of at least one full length, nominally 50 feet (15.24 m), of each size of hose. To expedite the test procedure, a “nominal length” may be assumed unless the actual length measured at 10 psig (69 kPa) is less than 48 feet (14.63 m) or more than 53 feet (16.15 m).
11 Proof Pressure Test 11.1 General 11.1.1 The hose, when lying straight, shall withstand a hydrostatic pressure of twice the maximum working pressure for 1 minute without leakage, ballooning or rupture. 11.1.2 A hose assembly, while lying straight, shall withstand a hydrostatic pressure of twice the maximum working pressure for 1 minute without leakage, ballooning or rupture of the hose and without slippage, leakage, or damage to the coupling. 11.2 Apparatus 11.2.1 The hydrostatic apparatus for this test is to be the same as that specified in 8.2.1. 11.3 Method 11.3.1 Samples are to consist of a full length, nominally 50 feet (15.2 m), of each size of hose or hose assembly. To expedite the test procedure, a “nominal length” may be assumed unless the actual length measured at 10 psig (69 kPa) is less than 48 feet (14.6 m) or more than 53 feet (16.2 m). This test can be conducted on the same sample used for the Elongation and Contraction Test, Section 8, and Twist Test, Section 9. If a hose assembly is being tested, the sample is to be marked prior to the test with a pencil or other suitable means at a point immediately adjacent to each coupling. 12 Hydrostatic Strength Test 12.1 General 12.1.1 A 3-foot (0.9-m) sample of each size of hose, while lying straight, shall withstand a hydrostatic pressure of four times the maximum recommended working pressure without leakage, ballooning or rupture.