ISO 13341:2010 pdf free download – Gas cylinders一Fitting of valves to gas cylinders.
6 Valving procedure for parallel threaded valves
6.1 An 0-ring seal dimensionally in conformance with ISO 15245-1 and compatible with the gas in service (see ISO 11114-2) shall be placed onto the valve stem. It shall be correctly positioned in the sealing area and shall not be damaged during placement.
6.2 No lubricant, sealant or tape shall be applied to the threads.
6.3 With the cylinder secured against rotation, the valve shall be fitted by hand paying particular attention to
prevention of damage to the 0-ring as it is engaged into the cylinder sealing area.
6.4 Once the valve has been screwed in by hand as far as possible, a properly fitting tool shall be used to
apply the torque specified in Annex A.
6.5 To validate the torque that was applied for fitting, the value shall be measured by unscrewing the valve. The minimum value obtained to move the valve shall be within the limits specified in Annex A. The checked valve/cylinder assembly shall be retorqued properly after this procedure.
A calibrated torque wrench shall be used.
7 Procedure for achieving valve alignment for cylinders with fixed (e.g. welded)
shroud and taper threads
7.1 The valve shall be inserted as specified in Clause 5.
7.2 Torque the valve to the minimum value, as indicated in the appropriate table, given in Annex A.
7.3 If necessary, screw the valve in further to achieve alignment of the valve outlet with the shroud opening. Do not in any case partially unscrew the valve.
NOTE Once the minimum torque in the range given in Annex A has been achieved, further rotation to align the valve should ideally continue at a lower speed without stopping; this is particularly important if a curing paste or fluid is used.
A.1 General
This annex applies to valves made from conventional material, e.g. stainless and carbon steels and brass.
The torque values given in this annex are based on the recommendations of gas cylinder and valve manufacturers. Many years of experience have proven that they are safe, give gas tight connections and are reliable for the full retest period.
However, for special valves (e.g. some valves with integrated pressure regulators) or special cylinders (e.g. composite cylinders with plastic liner or without liner), the manufacturers may specify reduced torque values (even below the minimum values given in this annex) that shall be applied (see Clause 3). In such a case the torque range values shall be identified by marking the cylinder in accordance with ISO 11119-2 and ISO 11119-3 and by issuing of installation instructions by the valve manufacturers. In case of doubt the manufacturer shall be consulted.