|Rebuilding Procedure for Resistoflex Bull's
Eye Sight Glass Indicator (BESI)
To establish written documentation for assembly of Bull's Eye Sight
Indicator (BESI) assemblies.
Covers assembly of all BESI Assy's (DI, CS, or SS).
Procedure begins after retaining flange, solid PTFE flat gasket, glass, FEP disc,
and PTFE envelope gasket have been removed. Wood covers should be
installed on the "run" flares to ensure they stay flat until time of
Note: If an end user must disassemble a BESI for any reason, the PTFE
envelope gaskets and FEP disks must always be replaced, even if the BESI
has never been in service.
- To begin rebuild, Install PTFE envelope gasket centered between
studs and against the PTFE flare on the cross. Note: If installing a
flutter flow indicator, it goes on the flare first, then the
PTFE envelope gasket.
- Install FEP disc centered on PTFE gasket.
- Install glass centered on FEP disc, taking care to check glass prior
to installation for chips and cracks. If chips or cracks are noted,
- Place solid PTFE flat gasket in recessed area of retaining flange and install
over glass, taking care to insure glass fits into recessed area of
flange and alignment of gaskets is not disturbed.
- Place lock washer on studs, install flat washer, and install nuts on
- Repeat above for other port, if necessary.
- Starting on 5 foot pounds and increasing in 5 ft-lb. increments,
torque nuts in a "star pattern" until torque values indicated are reached.
Allow assembly to sit at least 12 hours, then retorque all nuts in same
manner as above.
||Torque Value (Ft.lbs)
- Touch up all unpainted washers, studs, and nuts with standard primer.
- Hydrostatically test assembled and torqued sight glass indicator.
Note: Due to environmental conditions, there may be some water
or condensation trapped between the liner OD and the housing ID that
would appear at the vent hole upon initial pressurization during the
hydrotest. This type of moisture will not be continuous, and is not
a cause for rejection.
- Set test pressure to 425 psi
- Fill assembly with water and bleed off any air remaining in the
- Initiate test cycle, which consists of three cycles of one minute
- During test, pressure should not fall below 425 PSI and no leaks
should be visible.
- Any leakage detected from assembly or vent holes is cause for
- If assembly does not pass test, retorque per item no. 7 and re-test.
- If assembly continues to leak , disassemble, inspect for damaged
components, re-assemble, retorque, and retest.
- Spare Parts List
XXX is a size code as follows:
||PTFE Envelope Gasket
||solid PTFE flat Gasket
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