Rosco Maximizer 2B, Инструкция по эксплуатации, обслуживанию и ремонту

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4
Rosco Maximizer 2B Asphalt Distributor 4-13
Specifications
2
1
Flats Method Tightening
Figure 4-2
1 - Mark Line on Nut
2 - Example 2 Flats difference
7 . If a torque wrench cannot fit into the coupling area
or if it is unavailable, flats method may be used to
ensure that the coupling is properly tightened, as
shown in
Figure 4-2 .
NOTE: The mark placed on the nut and backup hex
after hand tightening should have rotated 1 to 1 .5
flats during final tightening. At this point in time, if
desired, the nut and backup hex may be marked
to indicate if the coupling loosens over time .
NOTE: O-Rings should be lubricated with light oil, but
threads should be completely dry unless making
pipe thread connections (interference seal) .
Attach the male end of the hose onto the
equipment first, since it may be necessary to
rotate the entire hose assembly to tighten the
male threads. Then route the hose into position
while avoiding twisting the hose .
4 . Hand tighten the connection by bringing seal face in
contact and rotating the nut by hand until it stops .
NOTE: By definition hand tight is 0.3-1 ft-lb or when the
seal faces are touching and with the threads
engaged the hex can no longer be rotated by
hand .
5 . Mark a line across the coupling nut and backup
hex for flats method verification of coupling torque
( Figure 4-2 ) .
6 . Apply a wrench to the backup hex to prevent the
coupling and hose from moving while tightening the
nut with a torque wrench.
Failure to retain the backup hex during
installation will also result in additional clamp load
force that could cause damage to the seal face.
NOTE: The coupling nut must be in motion for an
accurate torque reading. If the nut is stopped
before final torque value is achieved, it must be
loosened and retightened until the torque is
attained while the nut is in motion .
Table 4-9. Torque Specifications For NPTF Dry Seal Pipe Threads
NPTF
Dash Size Max Torque 1 . The torque values obtained from tightening pipe
threads can vary considerably depending on thread
condition. Adequate sealing can occur at values much
lower than the maximum values listed above . Only
enough torque to achieve adequate sealing should be
used .
2 . When using a male tapered pipe thread with a female
straight or parallel pipe thread, maximum values are
50% of those listed in the table .
3 . If thread sealant is used, maximum values shown
should be decreased by 25% .
1/16 Inch ft-Lb
-2 20
-4 25
-6 35
-8 45
-12 55
-16 65
-20 80
-24 95
-32 120
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