ASTM D4241-98
(Practice)Standard Practice for Design of Gas Turbine Generator Lubricating Oil Systems
Standard Practice for Design of Gas Turbine Generator Lubricating Oil Systems
SCOPE
1.1 This practice covers the design of lubricating oil systems for gas turbine driven generator units 1000 kw and larger.
1.1.1 The lubricating oil system is defined as that assembly which utilizes and circulates the turbine generator lubricating oil and furnishes pressurized oil for control and seal functions.
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 4241 – 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
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Design of Gas Turbine Generator Lubricating Oil Systems
This standard is issued under the fixed designation D 4241; 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
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 4. System
1.1 This practice covers the design of lubricating oil sys- 4.1 The operation of the gas turbine generator depends upon
tems for gas turbine driven generator units 1000 kw and larger. a satisfactory supply of lubricating oil at the proper places.
1.1.1 The lubricating oil system is defined as that assembly Thus, a highly reliable system must be supplied.
which utilizes and circulates the turbine generator lubricating 4.2 The system flow requirements include the summation of
oil and furnishes pressurized oil for control and seal functions. the individual requirements for lubrication of all the bearings,
1.2 This standard does not purport to address all of the gear meshes, couplings supplied by the system and the steady
safety concerns, if any, associated with its use. It is the state and transient control oil requirements. A margin should be
responsibility of the user of this standard to establish appro- added for flow changes with use.
priate safety and health practices and determine the applica- 4.3 The system pressure must be sufficient to overcome
bility of regulatory limitations prior to use. piping and equipment pressure drop, overcome elevation head
difference, provide margin for regulation, and ensure proper
2. Referenced Documents
distribution of lube oil to the required areas of the machinery.
2.1 ISO Standard:
4.3.1 The control and seal oil function may require higher
ISO 4572 Hydraulic fluid power-fillers-multi-pass method pressure levels than the lubrication. For these cases, the total
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for evaluating filtration performance
system pressures may increase to where reasonable or separate
control or seal oil pumps, or both, can be required.
3. Significance and Use
4.4 The designer should specify the maximum allowable oil
3.1 This guide establishes minimum recommended design
viscosity for cold start. With reduced temperatures the in-
practices for gas turbine generator lubricating oil systems to
creased lube oil viscosity can have a significant affect upon the
ensure that:
reliable distribution of the oil throughout the system and upon
3.1.1 Lubrication, control, and seal functions will be per-
the reliable operation of the controls.
formed satisfactorily by the oil mutually acceptable to the
4.5 Heat is rejected from a number of sources to the
parties concerned.
lubricating oil.
3.1.2 Installation, cleaning, and flushing will be facilitated.
4.5.1 Bearing shearing and pumping losses are transferred
3.1.3 Satisfactory system cleanliness can be maintained.
to the lubricating oil.
3.1.4 Safe practices are observed.
4.5.2 When accessory or load gearing are used, a major
portion of their losses is transferred to the lubricating oil.
4.5.3 Lubricated couplings add heat to the oil.
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This practice is under the jurisdiction of ASTM Committee D-2 on Petroleum
4.5.4 Because of the proximity of hot gas turbine parts,
Products and Lubricants and is the direct responsibility of Subcommittee D02.0C on
some heat is transferred to the lube oil. This is especially true
Turbine Oils.
with buried bearings.
All previous recommended practices have been published by ASME as joint
ASTM-ASME-NEMA standards. With the issuance of this document all standards
4.5.5 Pumping and throttling result in heat being added to
under the auspices of Technical Division C of ASTM Committee D-2 will be
the oil.
published by ASTM, solely as ASTM standards. This standard replaces ASME
4.6 Failure of the system to distribute lubricating oil to the
Standard No. 120.
Current edition approved June 10, 1998. Published October 1998. required areas can result in significant damage to machinery.
2 nd th
Available from American National Standards Institute, 11 E. 42 St., 13 fl.,
New York, N. Y. 10036.
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