MIL-HDBK-1003/7
Table 12
Typical Turbine Exhaust Pressure
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*
*
Condensing
Non-Condensing
*
*
Turbine Type
In. Hg Abs.
psig
*
*
*
*
Multivalve multistage
0.5 - 4.5
0 - 300
*
*
Superposed (topping)
--
200 - 600
*
*
Single valve multistage
1.5 - 4.0
0 - 300
*
*
Single valve single stage
2.5 - 3.0
1 - 100
*
*
Back pressure
--
5 - 300
*
*
Atmospheric pressure
--
0 - 50
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5.7
Lubricating Oil Systems
5.7.1
Single Stage Turbines. The lubricating oil system for small, single stage
turbines is self-contained, usually consisting of water jacketed, water-cooled, rotating
ring-oiled bearings.
Multistage Turbines. Multistage turbines require a separate pressure
5.7.2
lubricating oil system consisting of oil reservoir, bearing oil pumps, oil coolers,
pressure controls, and accessories.
a) The oil reservoir's capacity shall provide a 5 to 10 minute oil
retention time based on the time for a complete circuit of all the oil through the
b) Bearing oil pump types and arrangement are determined from turbine
generator manufacturers' requirements. Turbine generators should be supplied with a
main oil pump integral on the turbine shaft. This arrangement is provided with one or
more separate auxiliary oil pumps for startup and emergency backup service. At least
one of the auxiliary oil pumps shall be separately steam turbine driven or DC motor
driven. For some hydrogen cooled generators, the bearing oil and hydrogen seal oil are
served from the same pumps.
c) Where separate oil coolers are necessary, two full capacity, water
cooled oil coolers shall be used. Turbine generator manufacturers' standard design for
oil coolers is usually based on a supply of fresh cooling water at 95 degrees F (35
degrees C) at 125 psig (862 kPa gage). These design conditions shall be modified, if
necessary, to accommodate actual cooling water supply conditions. Standard tube material
is usually inhibited admiralty or 90-10 copper-nickel. Other tube materials are
available, including 70-30 copper-nickel, aluminum-brass, arsenical copper, and
stainless steel.
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