AS 2809.3 pdf download
AS 2809.3 pdf download.Road tank vehicles for dangerous goods
1 Scope and general
1.1 Scope This Standard specifies requirements for the design, construction, and inspection and testing of road tank vehicles for the transport of compressed liquefied gases by road. This Standard is complementary to AS 2809.1. 1.2 Objective The objective of this Standard is to provide designers, planners, operators and regulators with technical requirements for road tank vehicles transporting compressed liquefied gases. 1.3 Application In addition to this Standard, road tank vehicles for the transport of compressed liquefied gas shall also conform to AS 2809.1. Where any requirement of this Standard differs from a similar requirement in AS 2809.1, this Standard shall take precedence.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. NOTE 2 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. (d) Screwed connections to the tank shall not exceed 50 mm nominal bore, except for fully internal safety valves. (e) Safety valves shall be protected so that, in the event of overturn onto a hard surface, their opening will not be prevented and their discharge not restricted. (f) Each tank shall have a reflective bright metal or gloss white painted surface, except that another colour or finish may be used provided that the design service temperature has been adjusted in accordance with the maximum service temperature requirements of AS 1210. NOTE An absorptivity of 0.3 should be used for a typical white paint finish.2.1.2 Components required Each tank shall be provided with the following components: (a) A filling connection. (b) A discharge connection(s), one of which may also be the filling connection. (c) An additional dedicated discharge connection of not less than 32 mm nominal bore, which may only be used for maintenance or emergency discharge. A plugged or capped manual valve may be installed directly on this emergency discharge connection. This connection does not require brake interlock drive away protection. For existing vessels without a dedicated additional plugged or capped discharge connection, the emergency discharge provision may be provided in piping. (d) One or more safety valves. (e) A vapour return connection. (f) Contents gauging provisions (variable and fixed level). (g) A pressure gauge. A liquid-temperature-indicating gauge may be required in certain circumstances.
