ASTM D4248-98
(Practice)Standard Practice for Design of Steam Turbine Generator Oil Systems
Standard Practice for Design of Steam Turbine Generator Oil Systems
SCOPE
1.1 This practice is applicable to steam turbine-generator units and provides recommended practices for the design of the oil system.
1.1.1 The oil system is defined as that assembly which uses and circulates the turbine-generator lubricating oil. The oil system generally includes high pressure, bearing, control, generator seal, and drain systems. The system may also include the supply and return lines for a boiler feed pump and hydraulic coupling.
1.2 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D 4248 – 98 An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Practice for
1
Design of Steam Turbine Generator Oil Systems
This standard is issued under the fixed designation D 4248; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
The ever-increasing size and complexity of steam turbine generators makes the oil system more
important than ever. The system is required to provide not only lubrication but surface protection,
cooling, sealing, and control as well. Failure in any one of these functions could result in damage to
expensive equipment with loss of system capability and increased generation costs due to the use of
less efficient equipment or the purchase of power through interconnections.
This practice has resulted from a culmination of the experiences of the turbine builders, the erectors,
the oil suppliers and the operators. Of necessity it is a generalized and minimal standard. Previous
issues of this standard have been used in specifications to aid in obtaining satisfactory performance of
the lubricating oil system.
1. Scope systems is to ensure that:
3.1.1 Lubrication, control, and sealing will be performed
1.1 This practice is applicable to steam turbine-generator
satisfactorily by the oil in a manner mutually acceptable to the
units and provides recommended practices for the design of the
parties concerned.
oil system.
3.1.2 Installation, cleaning, and flushing will be facilitated.
1.1.1 The oil system is defined as that assembly which uses
3.1.3 Satisfactory system cleanliness can be maintained.
and circulates the turbine-generator lubricating oil. The oil
3.1.4 Safe practices are observed.
system generally includes high pressure, bearing, control,
generator seal, and drain systems. The system may also include
4. System Components
the supply and return lines for a boiler feed pump and hydraulic
4.1 Materials:
coupling.
4.1.1 Steel piping, tubing, valves, fittings, and fabrication
1.2 This standard does not purport to address all of the
plates are acceptable and recommended. The use of catalytic
safety concerns, if any, associated with its use. It is the
and corrodible materials, such as copper, zinc, and lead, should
responsibility of the user of this standard to establish appro-
be minimized, and if used, they should be properly alloyed.
priate safety and health practices and determine the applica-
Bearing linings should be made of tin base babbitt.
bility of regulatory limitations prior to use.
4.1.2 All materials used in system construction, including
2. Referenced Documents gaskets, seals, diaphragms, interior permanent type surface
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coatings, and hoses, should be resistant to turbine oils and
2.1 ISO Standard:
maintain adequate physical and chemical properties at the
ISO 4572 Hydraulic fluid power filters-multi-pass method
maximum expected operating temperatures and service life.
for evaluating filtration performance
4.2 Pumps:
3. Significance and Use
4.2.1 Pumps must circulate lubricating oil from the reser-
voir to the bearings, controls, and other points of use. The
3.1 The purpose of this guide for turbine generator oil
pressure level must be high enough to ensure proper distribu-
tion and satisfy control functions.
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This practice is under the jurisdiction of ASTM Committee D-2 on Petroleum
4.2.1.1 Satisfactory circulation and pressure levels must be
Products and Lubricants and is the direct responsibility of Subcommittee D02.0C on
Turbine Oils. provided for start-up, operation, and shut down.
All previous recommended practices have been published by ASME as joint
4.2.2 Several commonly used pumps are defined as follows:
ASTM-ASME-NEMA standards. With the issuance of this documen, all standards
4.2.2.1 The main pump normally supplies the oil circulation
under the auspices of Subcommittee C of ASTM Committee D-2 will be published
and pressure for the steam turbine generator operation.
by ASTM as ASTM standards. This standard replaces ASME Standard Practice No.
116.
4.2.2.2 The auxiliary pump is sized to permit continued
Current edition approved June 10, 1998. Published August 1998. Originally
operation if the main pump fails.
published as D 4248-83. Last previous edition D 4248-92.
2 nd th
4.2.2.3 The emergency pump is of reduced capacity. Its
Available from American National Standards Institute, 11 E. 42 St., 13 fl.,
New York, N. Y. 10036. function is to provide last resort lubrication for coastdown,
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