Australian Pipeline Valve - Installation, Operation and Maintenance Manual
16
EXPANDING SEAL PLUG VALVE DOUBLE BLOCK & BLEED API6D - TWIN SERIES
4 . 0 R E M O V A L F R O M L I N E
It is desirable that the maintenance operations are carried out by skilled personnel who are experienced
and well trained in standard field techniques and procedures. Be sure that the personnel involved in such
operations are aware of fundamental safety rules indispensable for the protection of their own and other
people’s safety.
If it is required to remove the valve from the line proceed as follows:
a- Ensure the line is fully depressurised.
b- Partially open the ball in order to depressurise the valve.
c- Remove the drain plug and vent plug. First release vent to ensure no remaining pressurised gas or fluid
trapped in cavity. Take safety precautions to avoid personal injury during this procedure. Then carefully
remove drain plug once you are sure valve has no remaining fluid or gas in cavity.
d- Keep the plug in the fully open position.
e- Remove the valve from the line. The valve shall be handled by means of lifting lugs fitting on the valve
(if applicable). Standard field techniques and procedures are satisfactory to disconnect it from the line.
f- After removal of the valve from the line, clean the valve and seal the ends with plastic or wooden
covers.
5 . 0 G E A R B O X R E M O V A L
a- Removal (refer to enclosed drawings)
• Unscrew the bolts/nuts.
• Lift the gear box to disengage the valve stem and remove it with the plate.
b- Put in position a removable cover to prevent the introduction of dust, sand, etc., in the actuator
bushing.
Steam seal body leakage can result in personal injury.
Note
The actuator or gearbox position stops have been properly set in the shop. Do not
alter the setting.
