THERMAL FLUID SERVICING
THIS WORK PACKAGE COVERS:
Replenishing Thermal Fluid Supply
Thermal Fluid (Item 2, WP 0271 00)
Rag, Wiping (Item 4, WP 0271 00)
Sealant, Pipe Thread (Item 8, WP 0271 00)
Tools and Special Tools
Tool Kit, General Mechanics (Item 1, WP 0272 00)
LADS power shut off at main control
Container, 5--Gallon (Item 3, WP 0272 00)
enclosure (WP 0112 00).
Thermal fluid can reach temperatures near 400o F when the heating system is operating.
Allow thermal fluid and heating system piping to cool prior to performing maintenance.
Always wear gloves and eye protection. Failure to follow this precaution could result in
severe personal burn injuries.
Overfilling expansion tank can cause high thermal fluid system pressure. Never fill tank
higher than full mark on dipstick. Over--pressurization of the thermal fluid system can
cause premature failure of components and result in hot thermal fluid be vented out onto
heater and surrounding equipment.
Introducing water into thermal fluid system can cause a steam excursion which may result
in damage to thermal fluid plumbing.
1. Check thermal fluid plumbing and verify the following:
a. All connections that were disconnected for maintenance have been reconnected.
b. Bleed valve (1) is closed.
c. Drain valves (2, 3, and 4) are closed.
d. Isolation valves (5 through 12) are open.
e. Isolation valve (13) is closed.
2. Place wiping rags under fill port (14) and vent port (15).
3. Unthread dipstick (16) from fill port (14).
4. Clean pipe thread sealant off of threads of dip stick (16) and fill port (14).
5. Determine approximately how much thermal fluid was drained. If less than four gallons was drained proceed to
step 9, otherwise continue to step 6.