AS 2809.3:2021 pdf free download.Road tank vehicles for dangerous goods Part 3: Road tank vehicles for compressed liquefied gases.
1.5 Terms and definitions For the purpose of this Standard, the definitions given in AS 2809.1 apply.
1.6 New designs and innovations This Standard does not prevent the use of designs, equipment, materials, methods of assembly, procedures and the like that do not conform with the specific requirements of this Standard, or are not mentioned in it, provided the performance requirements specified herein are met. Where a specific section does not state a performance requirement, use of components which by assessment and design achieve the same level of safety may be used. 2 Tanks, accessories and components
2.1 General
2.1.1 Tank design The tank, its supports and connections, shall conform to AS 1210 and with any applicable Standard for the particular cargo, with the following qualifications:
(a) The design pressure shall be not less than the equilibrium vapour pressure for the cargo at a temperature of 46。C, or not less than 700 kPa. An LP Gas tank shall be designed for propane unless it is dedicated to butane service exclusively. NOTE 1 For those cargoes whose vapour pressure can be below atmospheric pressure at winter temperatures, care should be taken to account for the possibility of a negative pressure in the tank. NOTE2 AS 1210 references AS 2872 which sets out a method for calculating the temperatures and corresponding pressures of fluids in vessels subject to atmospheric and solar heating in the hottest month of the year in various locations in Australia.
(b) The cargo load and static head for calculation of the dynamic loading shall be calculated on the basis of the mass fill ratio specified in Table 2.1.
(c) Except where otherwise approved, the materials of construction shall be steel alloy that is suitable for and compatible with the cargo. Screwed connections to the tank shall not exceed 50 mm nominal bore, except for fully internal safety valves.AS 2809.3 pdf download.