UL-1384:2017 pdf free download – STANDARD FOR SAFETY ANSI/CAN/UL /ULC 1384:2017, Water-Based Automatic Extinguisher Units.
9.11 When the pressure is applied to the convex side of an ellipsoidal or torispherical dome or bottom, the material thickness of the dome and bottom used for the calculations of 9.10 is to be multiplied by a factor of 1.67.
9.12 The material of the dome and bottom of a metal pressure vessel shall be of the same material as the sidewall of the pressure vessel and shall have a thickness after forming equal to or greater than the minimum measured wall thickness of the pressure vessel.
Exception No. 1: When the dome or bottom is formed integral with the sidewall and its thickness after forming is less than the minimum measured sidewall thickness of the cylinder, the intent of this requirement is met when the measured dome or bottom thickness is more than 87 percent of the thickness of the sidewall which accounts for any reduction in thickness resulting from the forming process.
Exception No. 2: These requirements do not apply to pressure vessels with a flat dome or bottom as defined in 9.16.
9.13 A dome or bottom is evaluated as being integral with the sidewall when the distance from the point at which the dome or bottom is turned (the tangent point between the dome or bottom and the sidewall) to the nearest circumferential joint of the pressure vessel (excluding the collar) is greater than the radius of the sidewall to the center of the pressure vessel.
9.14 When a torispherical form dome or bottom is used, the knuckle radius r shall be not less than 6 percent of the inside dish radius L, and the cylinder diameter d shall be equal to or larger than the inside dish radius L. Reference Figure 9.1.
9.15 When either a flat dome or flat bottom is integral with the sidewall, the minimum thickness of the thinnest section of the dome or bottom shall be twice the minimum measured sidewall thickness. The minimum inside knuckle radius, r, shall be 2.5 percent of the inside diameter of the sidewall.
9.16 For the purpose of these requirements, the shape of a dome or bottom shall be determined by calculating the ratio of the inside diameter, D, of the dome or bottom to twice the distance from the outside crest of the head to the inside tangent point with the sidewall, h. The ratio (D/2h) then shall be applied as specified in Table 9.2.
10 Pressure Relief Devices for Pressure Vessels and Cylinders
10.1 Pressure vessels and cylinders that are tested and marked in accordance with the specifications for shipping containers of the DOT, or Transport Canada, Transportation of Dangerous Good Regulations (TDGR) and are provided with pressure relief devices shall comply with the burst pressure requirements of the Pressure Relief Tests.
10.2 Pressure vessels and cylinders that are tested and marked in accordance with the specifications for shipping containers other than DOT, or Transport Canada, Transportation of Dangerous Good Regulations (TDGR) and are provided with pressure relief devices shall comply with the burst pressure requirements as specified in the appropriate national specification.
10.3 Pressure vessels and cylinders provided with pressure relief devices shall comply with the flow capacity requirements of the Pressure Relief Tests.
11 Gaskets and “0” Rings
11.1 A gasket of an elastomeric material shall be of sufficient thickness to provide a compression-type seal. A seal, gasket, or an “0” ring that is integral to the construction of an aerosol generator or other component shall comply with the Elastomeric Parts Test, Section 45.