SECTION 1
INTRODUCTION
July 2003
1-12
05130661
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.
WARNING
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.
WARNING
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.
WARNING
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). The whip will only flex in a single
plane without being subjected to torsional stress.
Torsional flexing will precipitate tubing failure. To
prevent torsional stress, the use of high-pressure
swivels is strongly recommended. To prolong swivel life
the whip must pass through rigid support bearing
blocks to prevent side-loading of the swivel spindle.
WARNING
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
WARNING
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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