8
Type BM5A
2. Use maximum (OPSO) adjusting nut (key 50)
to completely load maximum pressure (OPSO)
spring (key 53). Loosen minimum (UPSO)
adjusting screw (key 49) to completely relieve
minimum pressure (UPSO) spring (key 54).
3. Disconnect pressure control piping at port A.
4. Through port A, apply pressure to the controller
using a pump or other appropriate means and
raise the pressure to normal operating level.
5. Reset slam-shut controller. Then, reduce the
pressure until it reaches minimum cutoff level.
6. Use minimum (UPSO) adjusting screw (key 49) to
load minimum pressure (UPSO) spring (key 54)
slowly until the desired cut-off point is achieved.
7. Repeat steps (4) and (5) above to achieve the
required setpoint.
8. Bring pressure back to normal values.
9. Reset slam-shut controller. Then, raise the
pressure until it reaches maximum cut-off level.
10. Using maximum (OPSO) adjusting nut (key 50),
slowly unload maximum pressure (OPSO) spring
(key 53) until the desired cut-off point is achieved.
11. Repeat steps (8) and (9) above to achieve the
required setpoint.
Overpressure Protection
The recommended maximum allowable pressures are
stamped on the slam-shut valve label.
Provide upstream overpressure protection if
inlet pressure to slam shut valve can go higher
than maximum allowable/operating pressure to
downstream equipment.
After slam-shut valve’s intervention, inspect the
slam-shut valve for damage and maintain downstream
side pressure within the actual maximum operating set
up range to avoid abnormal back pressures that can
damage the SSD’s controller.
Provide downstream overpressure protection if the
slam-shut valve outlet pressure can be greater than
the maximum allowable pressure (PS) of the pilot
(differential strength type).
Slam-shut valve operation below the limits specified
in the specifications section and slam-shut valve label
does not preclude the possibility of damage from
external sources or debris in the line.
Startup
▲
WARNING
Remove lever unit (key 137) from reset
stem (key 6) of controller immediately
after reset and secure it in a safe place.
If violated, equipment damage and/or
personal injury may result.
△
CAUTION
To prevent damage to the controller
during Startup, the sensing and bleed
lines should be located on the same
side of the downstream block valve.
When red mark in controller gets to
“ON”, resetting has been completed.
Further operation will damage the
controller. Based on structural
characteristics, the torque for resetting
first increases then decreases with the
increase of rotation of handle.
Slam-Shut Valve
Once the slam-shut valve is properly installed, perform
the following steps to startup.
1. Partially open the isolation valve located
downstream of the regulator enough to allow a
minimum gas flow.
2. Partially open isolation valve upstream of the
slam-shut valve to let a small amount of gas to
flow into the slam shut valve.
3. Turn the reset stem slowly counterclockwise using
the appropriate lever unit. This will let gas to flow
from inlet to outlet of slam-shut valve.
4. Wait for few seconds for the pressure to stabilize.
5. Repeat step 3 above, making sure that levers of
slam-shut controller keep the valve open and that
lever (key 33) is in horizontal position.
6. Slowly open the isolation valve upstream
of slam-shut valve completely. Then, slowly
open the isolation valve downstream of
regulator completely.
