SECTION 1
INTRODUCTION
Jan 2001
Page 1-13
05114566
1.4.3 High Pressure (HP) Piping Safety
High pressure piping must be installed without torsional or bending stresses.
Proper supports and guides must be provided. 9/16” outside diameter HP
tubing and fittings are recommended between the pump and the cutting
station. This large tubing size will reduce vibration, strain and motion between
the pump piping and the cutting area. The larger piping diameter also reduces
pressure drop, and pressure pulsation.
Do not try to repair a leak in a HP water fitting when it is
pressurized. Always shut off the power and bleed the HP
water before doing maintenance on HP components. Weep
holes are provided to release HP water if leakage occurs at a
sealing surface. If a fitting is loosened with HP water
present, a jet of HP water will exit the nearest weep hole
with possible hazardous results.
Use extreme caution when handling high pressure
equipment. Possible failure from fatigue cracking or over-
pressurization can result in a hazardous high pressure
leak, or component failure.
A flexible ¼” HP tube (whip) is frequently used on the
cutting system to allow cutting nozzle movement. Supports
and guides for the whip must be used, anti-vibration
fittings and proper support must be provided to prevent
failures from external loads (non-water related stresses).
When tightening or loosening HP connections, always use a
supporting wrench to avoid bending forces or stress on the
connection. Do not exceed recommended torque values
High pressure piping and fittings designed to 4,100 bar
(60,000 psi) must always be used. Failure to do so may lead
to catastrophic component failure, which can cause
equipment damage, injury or even death.
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