6
PI-123
January 2022
18. If equipment malfunctions or a system malfunction is suspected,
immediately stop cleaning activity and relieve the pressure in the
system before attempting any repairs. Always follow the manufacturer’s
repair instructions.
19. Only trained persons should be authorized to perform any
maintenance or repair.
20. Following any repairs, the system should be operated at low pressure
for test. Bring equipment up to operating pressure slowly.
21. For shutdown in freezing conditions, even for brief periods, drain
water from all components. Prior to starting operations in freezing
conditions, the operation of all equipment components must be
checked carefully to make sure components are not frozen and can be
operated.
22. Store components properly by protecting them from damage when
not in use. Be sure all safety warning tags and markers remain intact.
CONTROL GUNS AND DEVICES
1. Read General Safety
section before connecting or using control
guns or control devices.
2. Thoroughly review alternative methods before initiating any
potentially dangerous shotgunning or hand lancing operation.
Fully automated, semi-automated, and/or mechanized methods
should all be considered first. Contact the applicable waterblasting
manufacturers for assistance and recommendations.
As described in the Industry Best Practices for the Use
of High Pressure Waterblasting Equipment published by the Waterjet
Technology Association, the standard shotgun barrel length shall be
a minimum length of 48” to minimize the risk of nozzle discharge
accidentally striking the operator’s feet, legs, or body. See Section 11.10.6.
The WJTA has recognized that deviations or variances from these best
practices may be acceptable under certain circumstances. See Section
2.7. If users believe deviation from this 48” standard is acceptable, they
should follow procedures outlined in Section 2.7 to minimize risk to the
operator. Among other things, users should ensure that other measures
to perform the work have been considered and exhausted, senior
safety management and customers have considered and approved the
deviation, operators have been properly trained and warned about any
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