SECTION 7
HIGH PRESSURE WATER
p. 7-4
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7.2.1 HP & LP Water Piping
Disconnect from/Reconnect to Waterjet Pump
Before performing maintenance on the waterjet pump
observe electrical LOCK OUT/TAG OUT procedures.
1. Loosen and remove HP Piping attached to the discharge HP check valve.
Move tubing to clear work area.
3. For servicing the discharge HP check valve on the intensifier assembly,
refer to section 7.3.1. “Discharge HP Check Valve”.
Note that the sealing head can be removed with the discharge HP check
valve attached.
3. Disconnect LP water at Hard Seal End Cap (HSEC). Note that to service the
sealing head, including the inlet HP check valve; the jackbolts must be
loosened allowing removal of the HSEC.
4. With the HP piping and the LP cutting water plumbing disconnected, the
following operations can be performed:
• HP cylinder can be removed from hydraulic cylinder head
• HP plunger seal can be serviced
After the pump has been reassembled, then the HP water piping and LP
water disconnect are reinstalled as follows:
5. Connect LP water hose fitting to flared fitting on HSEC.
6. Install the HP water piping to the intensifier. Check HP fittings for
proper collar position (1 to 1-1/2 threads exposed) and for adequate
thread lubricant (High Purity Goop). Turn on cutting water supply and
check for low-pressure leaks.
Check that all proximity switches are properly installed
and secured prior to starting the motor. Failure to
tighten proximity switch hold down screws (2 each per
proximity switch) will result in hydraulic oil spraying in
general directions.
7. Start the waterjet pump. Operate at low pressure (without a cutting
orifice) to flush the HP passages, and then operate at high pressure with
orifice installed to check for leaks.
ARNING
!
ARNING
!
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