Water supply requirements -3, Water supply requirements – Hypertherm HT4001 Plasma Arc Cutting System User Manual
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PRE-INSTALLATION
HT4001
Instruction Manual
3-3
Water Supply Requirements
The customer must supply a clean water source to the RHF console that will deliver 2.5 gpm (9.5 lpm) at a
minimum pressure of 150 psi (10.3 bar). To maximize consumable life, water temperature to the RHF console must
also be under 70°F (21°C). An effective way to meet these requirements is to include a water chiller in the HT4001
system.
From Source Supply to Water Chiller
The customer must provide a clean water source capable of delivering the following:
35 psi (2.4 bar) at 0.5 gpm (1.9 l/m) to the water chiller
(The water chiller then increases the pressure to a maximum of 185 psi (12.8 bar) and recirculates cooling water to
the electrode at a flow of 1.7 gpm (6.4 l/m).) To ensure water purity, use type K hard copper tubing for all plumbing
both before and after the water softener (or deionizer), including plumbing from the outlet of the water chiller to the
power track or festoon system. We suggest using copper tubing of 1/2 inch I.D. to the pump inlet.
Hypertherm recommends filtering the inlet line. Purchase filters locally or from Hypertherm.
Refer to water chiller instruction manual (802410 Model D) for additional information on the water chiller. Refer also
to Routine Maintenance in Section 6 for instructions on how to protect copper surfaces in the water chiller loop.
Water Quality
A low level of calcium carbonate (measured in water hardness) is critical for proper performance of the nozzle in
the torch. Excessive deposits of calcium carbonate on the nozzle will alter water flow and produce an unstable arc.
Hardness of the water at the torch must be between .206 and 8.5 ppm.
If using a conductivity meter to measure water purity, the recommended level is:
between .5 and 18 µSiemens/cm at 77° F (25° C).
Source water may require a water softener, reverse osmosis system or other de-ionizing equipment to obtain this
low level of hardness. Consult a water specialist for detailed advice in this area.
Water in the Water Table
A corrosion inhibitor can be added to the water in the water table to extend the life of the table and the workpiece.
When using the water muffler system with the HT4001, special filtering of the water table water is necessary. See
Optional Equipment – Water Muffler on page 3-12 for details.