2..............................................................................1
S 912-009-C00
(8) Do a Torque Check for the Use of Self-Locking Nuts Again (Fig. 209)
(a)
If you use self-locking nuts again, they must keep the minimum breakaway torque limits.
(b)
Do a torque check as follows:
1) For the minimum breakaway torque on self-locking nuts, refer to Fig. 209. a) This applies to the silver-plated, layered with
dry-film and lubricated self-locking nuts. b) The values given are for nuts with no axial load. 2) Do a minimum breakaway torque check as follows: a) Install the nut on a bolt until you can see 2 to 5 threads through the nut.
THREAD THREADS MINIMUM BREAKAWAY TORQUE
SIZE PER INCH POUND-INCHES N.m
3/4 5/8 9/16 1/2 7/16 3/8 5/16 NO. 12 (1/4) NO. 10 NO. 8 NO. 6 16 18 18 20 20 24 24 28 32 32/36 32/40 50.0 32.0 24.0 18.0 14.0 9.5 6.5 3.5 2.0 1.5 1.0 0.73 0.40 0.23 0.17 0.11 5.6 3.6 2.7 2.0 1.6 1.1
Minimum Breakaway Torque for Self-Locking Nuts
Figure 209
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b) Measure the torque necessary to turn the nut on or off the bolt.
CAUTION: DO NOT SQUEEZE OR CRUSH THE ROUND SHAPE OF THE
_______ SELF-LOCKING NUT TO GET THE REQUIRED TORQUE VALUE. DAMAGE TO THE EQUIPMENT CAN OCCUR.
3) You must replace all the nuts that do not keep these minimum friction limits.
S 912-010-C00
(9) Procedure to Tighten the V-Band Clamps
(a)
Tighten the V-band nut to 50 percent of the necessary torque. 1) Make sure you engage the coupling on the flanges equally around the outer width.
2) Make sure the seal is correctly engaged, if it is necessary.
(b)
With a plastic or non-metallic mallet, hit the coupling lightly around its outer width to apply the V-band tension.
(c)
While you increase the torque to 100 percent of the specified value, lightly hit the outer width to prevent loads that are not equal, if it is necessary.
(d)
After 100 percent of the specified torque is near, hit around the band again.
(e)
Tighten one more time to the specified torque value.
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CLAMPSHELL TYPE CLAMPS - MAINTENANCE PRACTICES
______________________________________________
TASK 70-20-03-912-016-C00
1. Installation of the Clampshell Type Clamp_________________________________________
A. General
(1)
This procedure gives the installation instructions for the clampshell type clamps you use on these:
-Power Plant Pneumatic Tubing
-Oil Tubing
-Hydraulic Tubing
-Fuel System Tubing.
(2)
The clampshell clamp assemblies have 3 parts: 2 of the same type clampshells and one of two types of clamps (cushioned or uncushioned).
(3)
The clampshell clamp assemblies, with the unplated clampshells, are used in high vibration and temperature (up to 800°F [427°C]) environments to hold the fluid system tubing.
(4)
The clampshell clamp assemblies, with cadmium plated clampshells, are used with aluminum tubing only and applies to a limit of 400°F (204°C).
(5)
These clamp assemblies are made for long life. Most of the worn areas occur on the surfaces of the clamp and the outer clampshell.
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