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API 681 : 1996 : R2010
Superseded
A superseded Standard is one, which is fully replaced by another Standard, which is a new edition of the same Standard.
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LIQUID RING VACUUM PUMPS AND COMPRESSORS FOR PETROLEUM, CHEMICAL, AND GAS INDUSTRY SERVICES
Hardcopy , PDF
10-08-2021
English
01-01-2010
Section 1 - General
1.1 Scope
1.2 Alternative designs
1.3 Conflicting requirements
1.4 Definition of terms
1.5 References
1.6 Unit conversion
Section 2 - Basic design
2.1 General
2.2 Casings
2.3 Casing connections
2.4 External forces and moments
2.5 Rotating elements
2.6 Mechanical shaft seals
2.7 Dynamics
2.8 Bearings, bearing housings, and lubrication
2.9 Materials
2.10 Nameplate and rotation arrows
Section 3 - System design
3.1 Ring liquid system
3.2 Controls and instrumentation
3.3 Drivers and transmissions
3.4 Couplings and guards
3.5 Belt drives
3.6 Mounting plates
3.7 Piping
3.8 Special tools
Section 4 - Inspection, testing, and preparation for
shipment
4.1 General
4.2 Inspection
4.3 Testing
4.4 Preparation for shipment
Section 5 - Vendor's data
5.1 General
5.2 Proposals
5.3 Contract data
Appendix A - Liquid ring vacuum pump and compressor
system data sheets
Appendix B - Liquid ring vacuum pump schematic
Appendix C - Shaft deflection schematic
Appendix D - Liquid ring vacuum pump ring liquid flow
schematics
Appendix E - Mechanical seal and piping arrangement
schematics
Appendix F - Material list
Appendix G - Liquid ring vacuum pumps and compressors
vendor drawing and data requirements
Appendix H - System considerations, operating variables,
and test performance conversion
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