Revision 1
prior
to
operation, the nozzle should be removed from the lance and the system flushed
thoroughly
to
remove air and foreign particles.
5.
Jetting guns and lances - Jetting guns and lances shall be checked daily and the
trigger mechanism and guard given a thorough visual examination to ensure correct
operation. All high pressure connections should be observed during operation
of
the
equipment at pressure.
If
a leak is observed, the high pressure water jetting unit shall
be shut down and the connection repaired or replaced before further operation.
6.
Foot control valves - All foot control valves shall be checked and cleaned daily and
the foot mechanism and guard given a thorough visual examination
to
ensure correct
operation.
7.
Electrical Equipment - All electrically operated high pressure water jetting units shall
be checked daily for external damage with special emphasis placed on connection,
junction boxes, switches, and supply cables. Care should be taken
to
ensure that the
electrical system is protected from the ingress
of
water. Correct direction
of
rotation
of
the electric motor should be checked on initial installation and after every
re-connection.
8.
Trailers - Mounted high pressure water jetting units shall be checked daily examining
tires, braking systems, jacking points, towing hitch, lights, safety chains, structural
damage, and general cleanliness. The units should only be towed by vehicles fit for the
purpose.
9.
Engine controls - All throttle cables and engine stop devices shall be checked daily to
ensure that they are functioning properly.
10.
Maintenance servicing
and
repair
The following operations should only be carried out
by
competent
personnel:
a.
NLB's servicing requirements
b.
The following items should be overhauled and checked for correct functioning at
manufacturer's recommended intervals:
• Pressure relief valve (by-pass valve)
• Bursting discs (rupture discs)
• Pressure control valve
• Hand or foot operated dump control valve, shut off control valve
• Dry shut off valve or dump system
• Changeover valve
11.
Tools - When maintaining or assembling high pressure water jetting systems, the
correct size tools must be used. The use
of
adjustable tools with serrated gripping jaws,
© Copyright January,
2001
NLB Corporation
2-18
To Next Page
Loading...