Cashco 2100 Gauge Hatch - Manual (Page 2)

2 IOM-2100
All nuts must be torqued in proper sequence and equal increments. Proceed through the tightening sequence until
the recommended torque is attained.
Recheck the torque on each bolt in the same sequence as bolts previously tightened may have relaxed through the
torque sequence.
SECTION IV
IV. MAINTENANCE - Replace Diaphragm
Maintenance procedures hereinafter are based upon removal of the gauge hatch from the tank fl ange.
Hatch with Locking Feature:
Knob Latch: Rotate knob (19) CCW slowly
several revolutions to allow eye bolt (12) and washer
(17) to slide out and dis-engage from the hinge arm
assembly (2).
All Hatches:
Remove cotter pin and washer (35) from arm
pin (9). Slide arm pin (9) out of fl ange base (1).
Lift arm (2) and pallet (30) sub-assembly up to
remove and place on work surface.
Gauge Hatch without Weights: Flip arm/pallet
(2,3) sub-assembly over and secure center bolt (20)
in a vice. Remove the “S” hook (33) from center bolt
(20). Rotate pallet nut (24) CCW and remove nut,
lock washer (23), fl at washer (22) and diaphragm
retainer (5).
Gauge Hatch with Weights: Flip arm/pallet
(2,3) sub-assembly over and secure center bolt nut
(25) in a vice. Remove the “S” hook (33) from center
bolt (20). Rotate nut (24) CCW to remove nut (24),
lock washer (23) and fl at washer (22).
Remove diaphragm retainer plate (5) and diaphragm
(4).
Clean and inspect pallet (3) seating surface.
Apply TFE paste around the hole in the pallet (3).
Install new diaphragm (4) in recess of the pallet (3).
Re-install diaphragm retainer plate (5), fl at washer
(22), lock washer (23) and nut (24). Torque nut to
20 ft-lbs.
Re-insert “S” hook (33) into the hole in the center bolt
(20). Use pliers to close the end of the “S” hook and
secure it so it can not be easily removed from the
center bolt (20).
Flip arm/pallet (2,3) sub-assembly over and re-install
the whole pallet (3) /hinge arm assembly (2) on to the
fl ange base assembly (1). Align the pin holes and
insert the pivot pin (9), washer (35) and cotter pin
(15). Turn back the ends of the cotter pin to secure.
Raise and lower arm/pallet (2,3) assembly to confi rm
that diaphragm (4) rest evenly on the seating surface
of the fl ange base (1).
If hatch includes a locking feature, engage eye bolt
(12) and washer (17) over groove in the hinge arm (2)
and secure in place.
Return to Section III for Installation.
MOUNTING
FLANGE
BOLT TORQUE - ft. * lbs. NUMBER
BOLTS TOTAL
STUD SPECI-
FICATIONS
FLAT FACE THREAD UNC
4” 78 8 5/8” - 11
6” 150 8 3/4” - 10
8” 228 8 3/4” - 10
10” 246 12 7/8” - 9
12” 348 12 7/8” - 9
TABLE 1
All Torque Requirements Are Dependant On Gasket Materal
Bolt Torque Specifi cations - ASME #150 Flange Connections
CAUTION
DO NOT attempt to remove a locked gauge hatch from
a tank or process vessel without fi rst bleeding all pres-
sure from the system.