9
Type BM5A
Slam-Shut Controller Adjustment
Perform the following steps to change the
slam-shut controller setpoints (overpressure
and/or underpressure).
1. Remove the spring closing cap of the controller.
2. Turn the adjusting screws clockwise to increase
setpoint or counterclockwise to decrease setpoint.
Monitor set pressure with a test gauge during
the adjustment.
Shutdown
▲
WARNING
To avoid personal injury resulting from
sudden release of pressure, isolate
the slam-shut valve from all pressure
and release trapped pressure from the
equipment and pressure line before
disassembly of equipment. In case of
disassembly of pressure retaining parts
for checks and maintenance procedures,
external and internal tightness
tests have to be done according to
applicable codes.
Maintenance
▲
WARNING
Only a qualified person may perform
maintenance procedures. If necessary,
contact our local Sales Office
for assistance.
Failure to test the slam-shut device for
proper shutoff can result in a hazardous
condition. Test the slam-shut device for
operation per applicable federal, state,
and local codes, rules and regulations,
and manufacturer’s instructions.
The slam shut valve and its accessories are subject
to normal wear and therefore, they must be inspected
periodically and replaced if necessary. The frequency
of inspection and replacement depends on the severity
of service conditions, test results found during the
annual test, and applicable codes and regulations. In
accordance with applicable National or Industry codes,
standards and regulations/recommendations, all
hazards covered by specific tests after final assembly
before applying the CE marking, shall also be covered
after every subsequent reassembly at installation
site, in order to ensure that the equipment will be safe
throughout its intended life.
The slam-shut device should be tested for both under
and overpressure shutoff activation and seat leak
annually with test intervals not to exceed 15 months
and at least one each calendar year. If the slam-shut
device does not close at the desired set pressure(s)
and/or leaks gas after closure, repair and/or replace
the slam-shut device.
Slam-Shut Valve (See Figure 7)
▲
WARNING
Only a qualified person may perform
maintenance procedures. If necessary,
contact our local Sales Office
for assistance.
Before proceeding with any
maintenance work, stop the fluid flow
to the unit. Turn off the isolation valves
upstream and downstream of the
slam-shut valve. Release pressure from
the equipment and control lines.
Disassembly
1. Disconnect all connections, remove slam-shut
valve from the line and place it in vertical position
(inlet flange at bottom and outlet flange at top).
Use appropriate protection method to prevent
damage to the flanges and their gasket surfaces.
2. Mark the position of the outlet flange (key 116) and
inlet flange (key 100) to keep the same/correct
alignment during reassembly.
3. Loosen the special screws (key 133) and dismount
the slam-shut controller.
4. Loosen screws (key 135) and remove hub
(key 124). Remove seeger ring (key 122) and
dismount parts. Replace O-rings [keys 120,125
and 126 (include key 130 for DN 150 / NPS 6)]
and anti-friction rings (key 119). Check bearing
[key 128 (include key 131 for DN 150 / NPS 6)]
and replace if necessary.
5. Slowly loosen nuts (key 112) to decompress the
spring (key 114).
6. Remove sleeve (key 117), disk (key 110) and
pad holder (key 101); loosen screw (key 104)
and replace pad unit (key 102). Replace O-ring
[key 107 (include key 129 for DN 65 / NPS 2-1/2
to DN 150 / NPS 6)].
