7.5.2 FIELD TEST CONNECTION
•
USE OF FIELD TEST INDICATOR:
• In-service verification of set pressure.
• Simplifies the periodic testing of safety valves.
! Pay attention to connect the field test
connection correctly!
Test gauge
Pressure-reducing
Pressure source
Trillium Flow Technologies
TM
pilot operated safety valves may be readily tested for verification of set pressure during normal system operation
with this option. Field Test Connection is an option on most models. Its connection is 1/4” NPT. The customer furnishes a pressure source,
plus a pressure-reducing valve and a test gauge for the portable field testing system. When test pressure is slowly admitted through a
pressure-reducing valve (Sarasin-RSBD
TM
preconize to increase the pressure until several bar below the pressure under the disc of the main
valve (operating pressure) and then increase the pressure with a gradient around 0.1bar/sec), the pilot and the main valve dome are
pressurized, simulating an increased system pressure. When set pressure is reached (pop action pilots only), the pilot will actuate. This
actuation pressure may then be compared with the nameplate value. Depending upon the current system pressure, and the characteristics of
the specific pilot, the main valve may also briefly open and close, or partially open and close, providing verification that the main valve piston
is free to move.
Trillium Flow Technologies
TM
pilot operated safety valves equipped with Field Test Connection may be fitted with a Field Test Indication as
additional option. Its connection is also 1/4” NPT and it is fitted just before the Field Test Connection (between the Field Test Connection and
the Test Gauge on the previous sketch). Trillium Flow Technologies
TM
pilot operated safety valves shall be pressurized at 90% of the set
pressure in order to perform this test. Then, operator can proceed like describe in the previous paragraph and Field Test Indicator will move
when the Set Pressure is reached in order to visualize the pilot swing
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78 SERIE SAFETY RELIEF VALVE
SARASIN-RSBD
™
