Rosco CSV - Determining Proper Torque

Determining Proper Torque
The only reliable method of creating a consistently
leak-free and long-lasting connection is to ensure the
coupling is brought to the proper torque. Using a torque
wrench with crowfoot is the best method, but the ats
method can be used if a torque wrench is not available.
The most straightforward method of determining the
correct torque setting is to multiply the desired torque
by the length of the wrench from the center of the handle
to the center of the drive (L); divided by the length of the
wrench from the center of the handle to the crowfoot
center (LA) as shown below:
LA
L
Figure 2-15. Torque Wrench - Crowfoot
The minimum torque values are
adequate for sealing most applications. Maximum
torque values should never be exceeded.
There are several methods of determining the correct
setting on the torque wrench when using a crowfoot. All
of the methods involve making the setting proportional
to the effective change in length of the wrench multiplied
by the desired nal torque. The equations and
illustration below describe proper measurements.
Equations
• Torque setting if the crowfoot is placed in line with
respect to the wrench:
TS = TD * L / LA
OR
TS = TD * L / (L+E)
• Torque setting if the crowfoot is placed at 90° with
respect to the wrench
TS = TD * L / LH
OR
TS = TD * L / √(L
2
+ E
2
)
• To estimate the crowfoot size (E)
E = Drive Size * 0.5 + Distance between Drive and
Open End + Wrench Size * 0.5774
L
E
LA
LH
Figure 2-16. Measurements Needed
LEGEND
L = Distance from center of torque wrench handle to the
center of socket drive
E = Distance from center of socket drive to the center of
crowfoot
LA = Distance from center of torque wrench handle to
the center of crowfoot
LH = Distance from center of torque wrench handle to
the center of crowfoot, when mounted at 90°
TD = Desired torque at the tting
TS = Torque setting indicated on wrench
2
Rosco CSV Variable Width Chip Spreader
2-9
Information and Specications