2-16. OPERATING MANHOLE FILL COVER (Con't).
c. Lift primary latch (3) slowly. Pull back on primary latch to release secondary latch on strong-
back (2). Lift up on strongback and open fill cover (4).
Ensure that secondary latch on strongback (2) is engaged in primary
d. Close fill cover (4). Firmly press down to engage secondary latch on strongback (2) in
tongue of primary latch (3). Listen for a snapping sound. Close primary latch.
e. Push vapor vent control lever in cabinet to close (see paragraph 2-2). Install dust cap (1) at
vapor collection adapter.
2-17. BONDING AND GROUNDING PROCEDURES.
a. GENERAL INFORMATION.
Static electricity is created whenever fuel is handled. Static electricity can also be
created when maintenance is performed on semitrailer. You cannot prevent static
Static electricity becomes a danger when it builds into a charge that may form a spark.
You can prevent sparks by following proper bonding and grounding procedures.
Bonding is an electrical connection between metallic units, for instance the semitrailer
and a fuel terminal facility. Bonding equalizes any static potential that might exist be-
Grounding is an electrical connection between one or both of the bonded units and
ground. Grounding effectively discharges into the earth any static potential that might
exist or that might be generated.
If two or more units are bonded and one is grounded, the whole system is effectively