Crane Home
  Home  |  About Us  |  Contact Us  |  My Account  |  Terms and Conditions  |  Careers  |  Links  |  Email Translator  |  

  Product Families
  Product Dimensions
  Spec Assistance
  Ask the Pipe Doctor
  Liner Types
  Chem. Resistance
  Product Specs
  Special Applications
  Tech Library
  Tools & Fabrication
  Inst. & Maintenance
  US/Global Sales   Contacts
  Design Manual

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 installation.

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, replace glass.
  • 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 studs.
  • 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.

    Size Torque Value (Ft.lbs)
    1" 20-25
    1.5" 25-35
    2" 40-50
    3" 70-80
    4" 50-60
    6" 90-100

  • Touch up all unpainted washers, studs, and nuts with standard primer.
  • Hydrostatically test assembled and torqued sight glass indicator.
    • Set test pressure to 425 psi
    • Fill assembly with water and bleed off any air remaining in the assembly.
    • Initiate test cycle, which consists of three cycles of one minute each.
    • 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 rejection.
    • 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.
    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.

  • Spare Parts List

    R6205-3-XXX PTFE Envelope Gasket
    R6205-8-XXX FEP Disc
    R6205-2-XXX Borosilicate Glass
    R6205-5-XXX solid PTFE flat Gasket
    R6205DI-4-XXX Retaining Flange

    XXX is a size code as follows:

    Size Code
    1" 016
    1.5" 024
    2" 032
    3" 048
    4" 064
    6" 096

"This page is a machine translation of the source page, which is written in
English. This translation is intended to provide a general idea of the
page's content, and is not guaranteed for accuracy."