Hpu considerations, Hpu cooling water requirements, Hpu electrical requirements – MTS Landmark Testing Systems User Manual
Page 28: Water quality, Hpu considerations 28
Landmark Test System Site Prep Guide
28
HPU Considerations
Additional Considerations
HPU Considerations
HPU Cooling Water Requirements
The hydraulic power units (HPUs) water connections are supplied with hose
nipples for the recommended type of hoses. The common type of recommended
hose is Uniroyal P-340 or equivalent hose rated for 150 psi (1.03 MPa) operation.
Shutoff valves should be included in the facility supply and drain lines should be
included to allow for unit maintenance. If the cooling water contains
contaminants (such as sediment) water filtration might be necessary to prevent
clogging of the heat exchanger tubes. See
“Hydraulic Power Unit Specifications”
on page 17 to find water pressure, hose size requirements, and water cooling
requirements for the HPU.
HPU Electrical Requirements
The electrical interface to the HPU occurs at the HPU starter box located on the
unit. Power cable access is provided into the box with cables coming from a
customer-supplied, fused electrical service disconnect. This disconnect must be
provided to safely remove all power to the HPU for maintenance work. Hookup
must conform to local electrical codes and regulations, see
“Model 505.07/.11
Specifications”
on page 18 and
“Model 505.20/.30 Specifications”
on page 20.
Water Quality
HPUs are equipped with water-to-oil heat exchangers that are designed to
remove 100% of the HPUs heat load. Water-to-oil heat exchangers, also referred
to as oil coolers, use heat transfer to cool the hot oil in the HPU by passing it over
tubes filled with cooling water.
Water chemistry is critical for a successful heat exchange system. Generally
speaking, municipal drinking water that is available in developed countries is
perfectly acceptable for copper tube heat exchangers. This water is non-polluted,
bacteriologically safe and has a neutral pH.
Cooling towers and natural water sources such as wells, rivers or ponds must be
free of pollutants and treated to limit contaminants to the same levels as
municipal drinking water.