One filter shall be for removing particles and the other for water removal
The filter for particles shall have a Beta rating of B6 greater than 75 at
400 kPa 60 psi differential tested in accordance with ISO 16889. The
reducer manufacturer may propose an alternate Beta rating by submitting
proof that B6 greater than 75 is unsuitable for the lubricant to be used.
Each filter shall incorporate an oil-filled differential pressure gauge to
indicate the pressure drop across the filter. The filter shall have an
internal magnetic element. The water removal filter shall maintain a water
content in the oil of no greater than 200 ppm. All filter assemblies shall
be sized so the pressure drop across the clean filter is no greater than 30
kPa 4 psi. The particle filter shall be sized to avoid bypass at a startup
oil temperature of 25 degrees C 80 degrees F. Filters shall have a bypass
setting of 300 to 400 kPa 45 to 60 psi. Element collapse rating shall not
be less than 1050 kPa 150 psi. The breather filter shall have a Beta
rating of B6 greater than 75 and a desiccant chamber to remove water.
2.8.5
Heat Exchanger
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NOTES: When using an oil-to-air heat exchanger, use
the second bracketed paragraph.
The designer must consider the water source. Where
possible, potable water is the first choice. When
flows are excessive, other sources must be used.
Depending on the turbidity of the water, different
methods will be needed to clean the water such as a
cyclonic separator. If the water through the heat
exchanger tubes is turbid, velocities should be kept
above 2 m/s (7 fps) to prevent clogging. Where the
water is brackish or otherwise highly corrosive,
70-30 tube material should be used. Plate heat
exchangers should be left as an option as they are
generally easier to maintain. Where suitable
cooling water is unavailable or may cause
maintenance problems, an oil-to-air heat exchanger
should be used.
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[The heat exchanger shall be either a water-cooled shell and tube type,
water-cooled plate type, or internal water-cooled coils within the reducer
sump. Heat exchanger tubes shall be [90-10 Copper Nickel Alloy] [70-30
Copper Nickel Alloy]. Heat exchanger plates shall be type 316 corrosion
resistant steel. Minimum tube thickness shall be 1.519 mm 0.0598 inch (16
gauge) and shall be adequate for the specified pressure rating. Water
shall be circulated through the tubes or plates and the design shall be
such that the tubes or plates can be cleaned. Cooling water will be
provided at a maximum temperature of [25 degrees C 80 degrees F] [_____],
at a pressure of [ 550 kPa 80 psi] [_____], at a maximum flow rate of [0.6
L/s 10 gpm] [_____]. The cooling water shall be strained to a maximum [3
mm 1/8 inch] [_____] particle size. The pressure drop through the clean
heat exchanger shall not exceed [55 kPa(gage) 8 psig] [_____]. The heat
exchanger shall be designed for a working pressure of [550 kPa(gage) 80 psig
] [_____]. The heat exchanger shall withstand a test pressure of 150
percent of the design pressure for a period of 4 hours during which time
the heat exchanger shall be checked for leakage. Any leakage will be cause
for rejection.]
[The heat exchanger shall be an oil-to-air type with size based upon a
SECTION 15005A
Page 15
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