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IMPORTANT WARNING
The male connector on the actuator rod is made from hardened steel and should never be left unprotected or
forced into a connection with the source assembly’s connector as this could damage the connector over time
leading to breakage during use.
ALWAYS manually move the sleeve of the source assembly connector to the OPEN position when connecting
and disconnecting the male connector of the actuator rod from the source assembly connector.
4)
Once the two are together, rotate the lock selector ring from “connect” to “operate”, which will mechanically
link the two units together.
5)
DO NOT push the lock-slide into the expose position. Leave the lock-slide in the secured position until
set-up is complete and personnel have left the immediate area.
B.
Operating instructions for the Pneumatic Actuated system
1.
Securely mount the Model 989 exposure device to the pipeline using the fixture kit or other secure
mechanisms.
2.
When performing SCAR technique, determine the thickness of shielding required to attenuate the primary
beam after it passes through the material being inspected. Shielding considerations must include the size of
the area the primary beam will produce at the back shielding. Secure the back shielding behind the
radiographic film cassette.
Post the “restricted areas” according to national regulations, and restrict access to the area to radiographic
personnel only.
3.
Attach the air hose to the exposure device actuator using the quick-connect fittings. Tug the air hose gently
away from the actuator to ensure a good connection has been made. Place the air pump control behind
shielding if possible or to the maximum length of the air hose if no shielding is available. Air hose is available
in lengths from 15 feet (4.6 meters) to 50 feet (15.2 meters).
4.
Perform a test exposure by pushing the lock slide from the “secured” (
GREEN MARKING
) position to the
“expose” (
RED
MARKING
) position. Retreat to the area where the air pump control is located. Attach the
air hose to the air pump, and tug gently to ensure a good connection. Verify the area is under restricted
access. Turn the air pump control knob to the “off” or “vent” position. Pump the air pump until a pressure
reading of 30-35 psi is achieved.
While observing a survey meter, rotate the control knob to the “operate” position. An increase over the
previous measured radiation intensity may not be noticed depending on the distance and shielding. There
will be a decrease in the original air pressure when actuating an exposure. It may require pumping the air
control back up to a minimum of 25 psi to properly maintain the radiographic exposure. Failure to
compensate for the pressure differential may cause partial or incomplete movement of the source into the
beam port.
5.
To terminate the radiographic exposure, turn the air pump control knob to the “off” position. Look at the
air pressure gage reading to ensure the air pressure has been completely exhausted from the air hoses and
pneumatic actuator. Depress the “Zero Pressure” valve to ensure the control is completely exhausted.
Disconnecting the air hose at the air pump control is a safety redundancy that will disable the control during
the set-up or dismantling of the set-up. If any operational issues are found during this check, the deficiencies
must be corrected prior to using the system for production radiography.
Summary of Contents for 989
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