volts, 60 Hz, three phase power. The pumps shall be rated for continuous
operation at a discharge pressure equal to or greater than the system
design pressure. The rated discharge capacity of each pump shall not be
less than indicated when the pump is operated at the design input speed and
discharge pressure.
2.1.9
Accumulators
The accumulators shall be the bladder type suitable for charging with
nitrogen. [The number of accumulators shall be as shown and the fluid
capacity shall not be less than [_____]. [L]. [gallons].] [The Contractor
shall determine the number and size of accumulators needed to operate the
system in accordance with paragraph DESIGN PARAMETERS.] The accumulators
shall be designed in accordance with ASME BPVC SEC VIII D1 for a rated
working pressure of not less than [_____] kPa.psi. Accumulators shall be
equipped with a safety device to release excessive pressure before the
burst pressure is reached.
2.1.10
Filters
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NOTE: Duplex filters shall be used only if
continuous operation is necessary without shutting
down the system for replacement of the filter
element.
To ensure maximum reliability of the system and
reduce repairs to or replacement of the system
components, the filtration level for the system
should be specified by the Beta ratio, the ratio of
the number of particles in a certain size range
upstream of the filter to the number of particles in
that size range downstream of the filter. This will
however increase initial costs and filter
maintenance.
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The filter[s] shall be located in the return line to the reservoir [and in
the pump discharge line] and shall be of the [spin-on type with a bypass
and an indicator to show the condition of the filter element] [duplex type
with a differential pressure device to indicate the need for filter element
service]. [The filter element shall have a rating of [[_____] microns
absolute] [10 microns absolute unless a smaller mesh is recommended by the
pump manufacturer].] [The filter element shall have a minimum silt control
rating of Beta sub two (2) = 2 and Beta sub ten (10) = 500 at 400 kPa 60 psi
differential pressure per [ISO 16889].] The filter shall be rated for use
with hydraulic oil and the pressure drop should not exceed 40 kPa 6 psi in
the clean condition. [The return filter shall be pressure rated for 1400
kPa 200 psiand a flow rate of [_____] L/s gpm.] [The discharge line filter
shall pressure rated for [_____] kPa psi and a flow rate of [_____]L/s gpm.]
[The Contractor shall determine the pressure and flow rating of the
filters to be compatible with his design of the power units.]
2.1.11
Gauges
2.1.11.1
Pressure Gauges
Pressure gauges shall conform to ASME B40.100, have a black enameled metal
case, a 115 mm 4 1/2 inch dial, and a stainless steel Bourdon tube. The
SECTION 15010A
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