- Hot search：
UL 19-2018 pdf free download
UL 19-2018 pdf free download.Lined Fire Hose and Hose Assemblies.
11.4.4 The length of the sample between fittings is to be measured and recorded to the nearest inch (centimeter). The position of the sample with regard to twist is to be noted. From this point on, neither the sample nor the fittings are to be touched, moved, or interfered with in any way until all measurements and observations have been completed at the final test pressure.
11.4.5 Following measurement of the length at 10 psi9 (69 kPa), the pressure in the sample is to be increased at a rate of 300 — 1000 psig (2070 — 6900 kPa) per minute until the required proof pressure is reached. While the pressure is being increased, the sample is to be examined for leakage and other defects. The proof pressure is to be maintained for at least 15 seconds, but not more than 1 minute. During the time the test pressure is maintained, the observations and measurements for elongation, twist, warp, and rise are to be completed.
11.4.6 If the sample warps to any appreciable extent and particularly if the allowable limit of elongation is approached, the length at proof pressure is to be measured by following the contour of the sample. For samples that do not warp to any extent, the measurement is to be taken parallel to the edge of the test surface. For this purpose, an edge of the table is to be marked off in feet and inches (meters and centimeters). All measurements are to be taken to the nearest inch (centimeter) from the inside edges of the fittings. The elongation of the sample is to be calculated from the measurement taken at the proof pressure and the measurement taken at 10 psi (69 kPa).
11.4.7 The amount of twist at proof pressure is to be measured by following the color line or by noting, in the period during which the pressure is being applied, the turns of the fitting at the free end of the sample. The amount of twist is to be recorded to the nearest one•eighth turn or 45 degrees (0.79 rad), and the direction as either right or left.
11.4.8 For samples having a nominal length of 50 feet (15.2 m), or less if specified, the warp is the maximum deviation between the sample and a straight line that is drawn between reference points on the fittings at each end of the sample.
11.4.9 For samples having a length greater than 50 feet (15.2 m) but not exceeding 100 feet (30.5 m), the warp is the maximum deviation between the sample and each of two straight lines. One straight line Is to be drawn between the reference point on one fitting to a reference point on the sample 50 feet from that titling. The other straight line is to be drawn from the reference point on the other titling to a reference point on the sample 50 feet from that fitting. All reference points are to be located on the centerline of the sample and the center of the fittings.
11.4.10 If a hose is not provided with a fitting at its free end, a lightweight fitting without lugs is to be attached to the free end. It a fitting with lugs is provided on the free end of the hose, an adaptor that does not weigh more than the fitting and that has a larger outside diameter than the lugs is to be attached to the fitting.
11.4.11 The maximum distance that the sample rises above the test surface while at the proof pressure is to be measured to the nearest inch (centimeter).UL 19-2018 pdf free download.
All resources on this website are from the Internet. It is only for personal study and research. No one is allowed to use it for any commercial purpose. If you need, please buy the genuine standard. If there is any infringement of your copyright, please contact the webmaster in time, and I will correct it immediately.
- Maybe you like
- Latest Updates
- ISO 287-2009 pdf free download
- ISO 527-5-2009 pdf free download
- ISO 659-2009 pdf free download
- ISO 660-2009 pdf free download
- ISO 712-2009 pdf free download
- ISO 725-2009 pdf free download
- ISO 730-2009 pdf free download
- ISO 927-2009 pdf free download
- ISO 2041-2009 pdf free download
- ISO 3040-2009 pdf free download
- ISO 3506-2-2009 pdf free download
- ISO 3506-3-2009 pdf free download