GE H301 Series, Руководство по эксплуатации

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H301/302 HSR Compressors | Rev. 2.2 | 29
calibration accuracy. Torque wrench accuracy must be verified annually or as
required.
8. Special wrench adapters are sometimes required to tighten fasteners that are
not readily accessible. When torque wrench adapters (socket, boxed end or
crow’s foot) are used, the torque setting will not match the applied torque. The
only exception to this rule is when the adapter is used at a right angle (90°) to
the wrench center line; see Figures B 1 and B 2.
9. The ratio between actual fastener applied torque and the wrench setting is as
follows;
Tf x L
Tw =
L + A
FiguRe 5
Torque wrench with adapter at any angle except 90° right angle
FiguRe 6 Torque wrench with adapter at right angle (90°)
Example:
Tf - bolt torque requirement equals 100 Ft-lbs.
L - Length of torque wrench socket drive to point of applied force equals 18 inches.
A – Effective length of torque wrench adapter or extension equals 3 inches.
= 85.7 Ft-lbs.
1800
=
21
100 x 18
Tw =
18 + 3
Tw = Torque wrench setting, lbs/ft. or lbs/in.
or Nm.
Tf = Fastener’s torque requirement, lbs/ft.
or lbs/in. or Nm.
L = Torque wrench length (from square
drive end to handle’s center point), ft.
A = Adapter length (measured along
wrench’s center line, from drive end to
adapter), ft.