AS 2809.3:2021 pdf free download – Road tank vehicles for dangerous goodsPart 3: Road tank vehicles for compressed liquefied gases

AS 2809.3:2021 pdf free download – Road tank vehicles for dangerous goodsPart 3: Road tank vehicles for compressed liquefied gases.
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.
1.4 Normative references
The following documents are referred to in the text in such a way that some or all of their content cotistitutes requlremcnt.s of this document.
AS 1210, Pressure vessels
AS 1271, Safely valves, other valves, liquid level gauges and other fittings [or boilers and unfired pressure vessels
AS 1349, Bourdon tube pressure and vacuum gauges
AS 2809.1. Road tank vehicles for dangerous goods. Part 1: General requirements for all road tank vehicles
AS 4041, Pressure piping
AS D26, TUbe fittings with Dryseal American standard taper pipe and unified threads for automotive and mdustrial use
AS/NZS 1596, The storage and handling of LP Gas
AS/NZS 1869. Hose and hose assemblies for liquefied petroleum gases (LP Gas). not ural gas and town gas
AS/NZS 60079.29.2, Explosive atmospheres, Part 29.2: Gas detectors—Selection, installation, use and maintenance of detectors for flammable gases and oxygen
ISO 5771. Rubber hoses and hose assemblies for transferring anhydrous ammonia — Specification ISO 10497, Testing of valves — Fire type-testing requirements
ANSI/CGA G-2.1-20 14, Requirements For The Storage And Handling Of Anhydrous Ammonia (An American National Standard)
API 607, Fire test for quarter-turn valves and valves equipped with non-metallic seats
2.2.1.2 LiquId In/out flow opening
Where the opening is larger than that of a 25 mm nominal bore pipe, an internal excess-flow valve and a quick-closing internal valve, or an air actuated (ISC) valve, shall be litted.
Where the ISC valve option is chosen, the opening shall he provided with a minimum of one independently operated positive shut-off valve In addition to the ISC valve, to shut off the line In the event of ISC valve failure. This shut-off valve shall be located as close as practicable to the tank and may be manually operated.
Where the opening is not larger than that of a 25 mm nominal bore pipe. an internal excess-flow valve shall he fitted, together with an external air actuated positive shut-off valve located as close as practicable to the tank.
For dedicated drain connections, an ISC valve plus a manually operated shut-oil valve shall be fitted and be located as close as practicable to the tank, The manual valve shall be plugged or capped.
NOTE For pump suction outlets, due to access constraints and the torque required to operate the secondary positive shut-off valve, consideration should he given to Installing an air actuator.
22.1.3 Liquid In How only opening: pump bypass return or top fill connection
These connections shall he fitted with openings in accordance with Clause 2.2.1.2 or an internal non- return valve and an air actuated flanged shut-off valve, provided the opening conforms to the following:
(a) It is in the bottom of the tank.
(b) It provides both an Internal thread and flange connection.
2.2.1.4 Vapour connections opening
These connections shall be fitted with openings In accordance with Clause 2.2.1.2 or an internal excess flow valve and an air actuated flanged valve, provided the opening conforms to the following:
a) It is in the bottom of the tank.
(b) It provides both an internal thread and flange connection.
(c) The size does not exceed 50 mm nominal bore pipe.
2.2.1.5 Tubing supplying air actuated valves
Any valve that is actuated pneumatically shall bc supplied by polyamidc (nylon) tubing that has a rated temperature of not more than 120 C, arranged to respond to a lire near the tank outlets.
2.2.2 Pipeline shut-oil valve
A shut-off valve shall be provided at the end of every liquid and vapour transfer pipe including at the end of piping which supplies a hose. Where a hose is not drained of liquid on completion of the transfer operation, It shall be fitted with a manual shut-off valve or lever actuated self-sealing nozzle at the discharge end.