24 PI-121 January 2020
4. Repeat steps 1, 2, and 3 at each of the following pressures without
exceeding the maximum operating pressure of the system:
• 1/2 of desired operating pressure
• 3/4 of desired operating pressure
• 2,500 psi below desired operating pressure
• Full operating pressure
During all waterblast operations, a “safety watch” opera-
tor should observe the waterblast operator(s) at all times from a safe,
but proximate, distance. The safety watch should have both voice and
sight communication with the waterblast operator at all times. The safety
watch must have the ability to instantly shut the waterblast system down
(from his location) with the use of a shutdown device (such as Jet-
stream’s Emergency Shut-Down Package, PN 53120) if the gun operator
encounters problems or if a problem is suspected. Call Jetstream for
system specific recommendations.
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