Brooks Instrument MT3809G - Manual (Page 49)

Installation and Operation Manual
X-VA-MT3809G-MT3810G-eng
Part Number: 541B182AAG
September, 2013
Models MT3809G & MT3810G
4-3
Section 4 Maintenance
c. Size 8 (½") flanged, gas service
1. Remove the meter from the process line and lay the meter horizontal on
a table.
2. Remove the gasket support ring. A bearing puller of the correct size is
recommended to remove the gasket support ring.
3. Secure the damper from turning by inserting a 1/8” pin through the top
guide cartridge. While holding the damper in place, remove the top/outlet
screw.
4. Push the float assembly out through the inlet/bottom.
5. To clean the gas damper, unscrew the cylinder head. Then remove the
bolt and carefully take out the small piston so as to not damage the critical
surfaces.
6. Reassemble the meter by assembling the damper with float assembly.
Insert the float assembly with damper into the inlet/bottom of the meter.
Secure the inlet/bottom screw. While holding the damper in place with a
pin(1/8” diameter), insert and secure the top/outlet screw. Replace
thespiral retaining ring.
d. Sizes 10 (1"), 12 (1½"), 13 (2") flanged, liquid service
1. Remove the meter from the process line and lay the meter horizontal on
a table.
2. Remove the gasket support ring. A bearing puller of the correct size is
recommended to remove the gasket support ring.
3. Loosen the inlet and outlet screws. Remove inlet screw at the bottom of
the meter.
4. Remove the guide vane at the bottom of the meter and gently push the
float assembly up and out the top/outlet side.
5. Reassemble by inserting the float assembly into the top of the meter.
Replace the guide vane and secure the float assembly by tightening
the inlet and outlet screws.
e. Sizes 10 (1"), 12 (1½"), 13 (2") flanged, gas service
1. Remove the gasket support ring. A bearing puller of the correct size is
recommended to remove the gasket support ring.
2. Secure the damper from turning by inserting a 1/8” pin through the top
guide cartridge. While holding the damper in place, remove the top/outlet
screw.
3. Push the float assembly out through the inlet/bottom.
4. To clean the gas damper, unscrew the cylinder head. Then remove the
bolt and carefully take out the small piston so as to not damage the critical
surfaces.
5. Reassemble the meter by assembling the damper with float assembly.
Insert the float assembly with damper into the inlet/bottom of the meter.
Secure the inlet/bottom screw. While holding the damper in place with a pin
(1/8” diameter), insert and secure the top/outlet screw. Replace the spiral
retaining ring.
f. Sizes 15 and 16 (3" and 4") flanged, liquid or gas service (size 15 only)
1. Remove the meter from the process line and lay the meter horizontal on
a table.
2. Loosen the float assembly by fixating two pliers one on each end of the
float assembly inlet guide cartridge. Turn to loosen with the help of a pin
wrench.
3. Carefully remove the complete float assembly and conical taper as well as
the spacer bushing (size 16 only) out the inlet/bottom of the meter.