AccuLoad IV Installation & Maintenance Manual
Closing and Sealing the Enclosure 58
5 Closing and Sealing the
Enclosure
5.1 Closing the Explosion-Proof Housing
When securing the front cover of the AccuLoad models ST or QT, complete the following steps to ensure
the unit is properly sealed and is safe to operate in a Division 1, Zone 1 environment:
1. Inspect the door seal O-ring for damage and replace if damaged. The O-ring is not required to maintain
the explosion-proof rating; however, it is required to maintain the IP 65 ingress protection rating.
2. Grease cover flange with petroleum jelly or TechnipFMC grease (part number 644886401) before
attaching the cover to the housing.
3. Verify that the mating areas between the front cover and the main housing are not scratched, corroded, or
otherwise damaged such that the surface contact between them would be compromised.
4. Close the cover and tighten the cap screws around the perimeter of the front cover using the sequence
shown below. The final torque should be 20 ft∙lb/240 in∙lb (27.1 N∙m/276.4 Kg.cm). Be sure to note the
locations for the two longer bolts used for the security seal wire.
5. Check that the enclosure is properly sealed by verifying the cover-to-enclosure joint gap with a 0.0015-
inch (0.0381-mm) feeler gauge. The feeler gauge must not enter the joint more than a ¼ inch (6 mm)
at any point around the perimeter of the cover to the housing joint (see Figure 52: Flame Path Verifica-
tion for an example).
Figure 50: Cover Bolt Torque Pattern for AccuLoad IV Model ST
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