Emerson Rosemount OCX 8800, Instruction Manual

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Replace Tube
Fittings
April 2017
Instruction Manual
IM-106-880C, OI
22
2
Remove Tube
Fittings
9.7.1 Remove Tube Fittings
The OCX construction includes pipe thread sealant to seal fittings in all ports that pass through
to an outer wall of the instrument housing base. Use the following instructions to loosen and
remove tube fittings that are secured with pipe thread sealant.
Use heat resistant gloves when removing a damaged tube fitting. The pipe threads
are bonded with a pipe thread sealant. The thread sealant softens at 450 °F (232
°C).The heated parts can cause severe burns.
1. Secure sensor housing (1, Figure 9-26 ) or electronics housing (2) in soft (plastic, wood,
or brass) vice jaws.
2. To soften the pipe thread sealant, use a propane torch to heat the tube fitting (3, 4, 5, or
6) to 450 °F (232 °C), minimum.
3. While heating the tube fitting, use a wrench to apply removal torque until the pipe
thread sealant softens. Remove and discard the used fitting.
4. Use MEK or methylene chloride solvent to clean thread sealant residue from the internal
pipe threads in the housing. Refer to applicable MSDS sheet for solvent handling
precautions.