Emerson Bettis G2XXX M11 series Service Instructions Manual page 30

Section 3: Actuator Reassembly
August 2015
3.6.3
3.6.4
3.6.5
3.6.6
WARNING: PED PRESSURE TESTING
The actuators main pressure bearing parts will be tested in controlled conditions in
accordance with the requirement of PED by pressuring both sides of the piston to avoid
damage and over torquing of the actuator components. If further future testing in the
field is necessary, Emerson should be contacted for guidance.
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Apply NOP pressure to the pressure port in inner end cap (3-10) and allow the
actuator to stabilize.
Apply a commercial leak testing solution to the following areas:
3.6.4.1 Joint between inner end cap (3-10) and cylinder (3-70). This checks
cylinder to inner end cap O-ring seal.
3.6.4.2 The port hole in the outer end cap (3-80). This checks the piston seal to
cylinder (3-70), O-ring seal (4-70), and rod seal (4-50).
3.6.4.3 The vent check port hole in housing. This checks Polypak seal (4-30)
that seals piston rod (3-40) to inner end cap (3-10).
3.6.4.4 Remove pressure from the pressure inlet port.
If an actuator was disassembled and repaired, the above leakage test must be
performed again.
Shell Pressure Test – Optional pressure test could be performed on PED certified
actuator by applying pressure to both sides of the piston simultaneously for a
period of two (2) minutes. If any leakage occurs across a static seal, the unit
must be disassembled and the cause of leakage determined and corrected.
Service Instructions
124843E Rev. C
Actuator Reassembly