EN ISO 13691:2002

Petroleum and natural gas industries - High-speed special-purpose gear units (ISO 13691:2001)

Publication date:   Oct 23, 2003

General information

90.93 Standard confirmed   Feb 14, 2007


CEN/TC 12 Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries

European Norm

21.200   Gears



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This International Standard specifies the minimum requirements for enclosed, precision, single and double helical,
one- and two-stage speed increasers and reducers of parallel shaft design with pinion speeds of 3000 min−1 or
greater, or pitch line velocities of 25 m/s or greater, for special purpose applications. Such applications will typically
be required to operate continuously for extended periods, without installed spare equipment and are critical to the
continued operation of the installation. By agreement this International Standard may be used for other services.
This International Standard also specifies a method of rating gears which meet the following criteria:
a) gear accuracy
 teeth accuracy: accuracy grade 4 or better as given in ISO 1328-1:1995, for both single pitch deviation, fpt,
and total cumulative pitch deviation, Fp,
 total helix deviation Fβ between the helices of the pinion and wheel: accuracy grade 4 or better as given in
ISO 1328-1:1995;
b) range of the transverse contact ratios: 1,2 < εα < 2,0;
c) overlap ratio εβ W 1,0;
d) helix angle: 5 u β u 35°;
e) working flanks of the pinion or gear: provided with profile modifications to obtain a good conjugate tooth load
distribution along the path of contact;
f) working flanks of pinion or gear: modified as necessary to compensate for both torsional and bending
deflections and, when necessary for gears with pitch line velocities in excess of 100 m/s, also for thermal
g) gear lubrication: straight mineral oil, viscosity grade VG-32 or VG-46 (see ISO 3448);
h) material of the gear teeth: quality MQ or better, in accordance with ISO 6336-5:1996.

Life cycle


EN ISO 13691:2002
90.93 Standard confirmed
Feb 14, 2007


Adopted from ISO 13691:2001 IDENTICAL