Ashcroft 80-81 - Isolation Rings - Manual (Page 9)

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Step 3: Tighten the piping flange bolts to the locking nuts / washers on the opposite flange. Each should be
tightened by cross-bolting with the proper torque based as described in ASME PCC-1 on NPS, ANSI/ASME
Class rating, and gasketing used.
ASSEMBLY REMOVAL
IMPORTANT: In the event the assembly needs to be removed from process, follow the manufacturer’s rec-
ommended procedure to prevent possible injury and/or damage.
A. Confirm process has been shut down with process pressure relieved and piping drained, cleaned and
dried before installation and/or removal of product assembly.
B. Ensure the assembly is supported prior to removal of bolts/flanges.
PIPE FLANGE
(NPS 4", CLASS 300 SHOWN)
CENTERING GAGE
ISOLATION RING
(NPS 4", TYPE 80 SHOWN)
FLANGE BOLT
INSTRUMENT REMOVAL DEVICE
(NEEDLE VALVE SHOWN)
ASSEMBLY FLANGE
ASSEMBLY SCREW
FLEXIBLE LINER
SENSING FLUID
FILL PORT
CENTER BODY
FLANGE GASKET
FLANGE BOLT
6- ASSEMBLY REMOVAL
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