ASTM F993-17,Standard Specification for Valve Locking Devices.The size of this standard pdf file is 868K.
ASTM F993-17 covers the application, design, and materials for valve locking devices.
6. General Requirements
6. 1 A label plate shall be installed on or near the locking device to instruct the operator on usage.
6.2 When noise reduction is necessary, the contacting parts of the locking device shall have a rubber coating or lining.
3 The locking device must be able to lock the valve in both the fully opened and completely closed positions.
6. 4 When using Type L, the cable shall be installed suffiiently tight to prevent more than slight movement of the handwheel in a direction opposite of the designed position but not so tight as to place the cable in tension
6.5 The position of the locking device on the handwheel shall be as to resist movement of the valve stem.
6.6 Type ll dimensions shall be used to determine the size of the lever arm, extension on pipe hanger, and the position of the locking holes and slot.
6.7 When specified by the purchaser, a padlock can be used instead of the quick release pin or spring hook
8. Keyword
8. 1 locking device; marine technology; ship; valve; valvelocking device.