Section V – Maintenance
MN06135 Issue/Rev. 1.3 (6/17) 85
III. Guidance for equipment inspection and maintenance is provided by EN/IEC 60079-17: “Electrical Appa-
ratus for explosive gas atmospheres, “Inspection and maintenance of electrical installations in hazard-
ous areas” and should be utilized for the inspection / maintenance process.
I
V. When performing maintenance that requires opening of the enclosure cover, all flame paths, which are
defined as the machined flanged surface between the housing and the cover, shall be inspected to en-
sure that they are clean and undamaged, no scratches, nicks, corrosions, or other defects that would af-
fect the integrity of the flame path are allowed. If defects are detected the equipment should not be
placed back into service until the issues are resolved. Flame paths between window and cover an
d
k
eypad and cover should be inspected at an increased frequency for signs of corrosion when installed
in special environments.
V. Verify that all tapped cover bolt threaded locations in the enclosure are clean and intact with no miss-
ing/stripped threads.
VI
. Verify that the cover bolts are the required M8 x 1.25-6g. Din 912, Steel Grade 12.9. Prior to reassembly
apply a light coating of nickel based anti-seize such as TechnipFMC P/N (646002401) to all bolt
threads.
VI
I. Verify that any blind threaded cover bolt holes do not have excessive grease / anti-seize packed into
them as this could cause hydraulic fractures of the enclosure when the bolts are tightened.
V
III. Inspect to see that the environmental O-ring is correctly installed (seated into the groove) and in go
od
c
ondition, no cracks, etc. if defective replace to maintain environmental protection. Grease cover flange
with petroleum jelly or TechnipFMC grease (P/N 644886401) before reattachment of the cover to the
housing.
IX
. Follow cover bolt torqueing procedure as outlined in section 12, when complete, verify the flame pat
h
ga
ps as per the procedure.
Special Environments
I
n corrosive environments such as near salt water, is the user’s responsibility to increase the inspection intervals for
verification of the flame path integrity. Inspection intervals will vary with local conditions and is the user’s responsibil-
ity to select appropriate intervals.
T
he most effective preventive maintenance is periodic wash downs of the enclosure to remove the salt buildup on
the outside surfaces. It is recommended to use a mild soap applied with a sponge or cloth with a low pressure non-
saline water rinse.
I
t is also very important to maintain the painted exterior painted finish of the equipment, if exterior corrosion is de-
tected, the finish should be cleaned, removal of any corrosion by mechanical means and prepared for painting, the
affected area shall be repainted with a corrosion inhibiting paint. Factory paint is two-component polyurethane-
acrylic enamel, Polane
®
T manufactured by Sherwin Williams, colors is “Precision Tan” and “Carbon Black”.
I
t is required to apply a coating of petroleum jelly or TechnipFMC grease (P/N 644886401) to flanged metal surfaces
to offer a protective barrier to reduce the effects due to exposure to saline solution i.e. wet salt air, this surface
should be cleaned and new grease reapplied every time the cover is opened for inspections or maintenance, this in-
cludes the flame path between the window and cover and the keypad and cover.
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