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Page Title:
Table II. Hydraulic Line Support Spacings |
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|  MIL-H-8891A
shown in Table II, except that where tubes support fittings, such as unions
and tees, spacings should be reduced approximately 20 percent. Where tubes
of different diameters are connected together, an average spacing distance
may be used. In any event, installation shall be in accordance with
3.11.4.4 and 3.11.10. Provisions shall be made in support locations to
accommodate change in tubing length caused by expansion and contraction.
In order to facilitate inspection and repair, tubing shall not be bundled
together.
HYDRAULIC LINE SUPPORT SPACINGS
TABLE II
MAX. LENGTH BETWEEN SUPPORT CENTERS
NOMINAL TUBE OD
(MEASURED ALONG TUBE)(INCHES)
( INCHES)
1/8
3/16
16
1/4
18
5/16
*
20
3/8
23
1/2
25-1/2
5/8
27-1/2
3/4
30
1
31-1/2
1- 1/4
32-1/2
1- 1/2
.
Installation clearances - Where tubing is supported to
*
3.11.4.4
structure or other rigid members, the clearances shall be in accordance with
ARP 994.
Straight tube lines - Straight tube lines between two
3.11.4.5
rigid tubing end connections shall not be used.
Designed motion in tubing - Looped or straight tubing
3.11.4.6
shall not be used between two connections where there is designed relative
linear motion. Coiled tube and torsion-tube installations of corrosion-
resistant steel tubing shall be designed and installed in accordance with
the data given in ARP 584.
Installation of small size tubing - If tubing in
3.11.4.7
sizes smaller than 1/4 inch outside diameter (-4 size) is used in hydraulic
systems, particular care shall be taken to properly install, support, and
protect it, and it must be shown that proper operation of the system in
o
which such tubing is used will be possible at -65 F temperature.
Tubing in fire hazard areas - Within powerplant com-
3.11.5
partments and at other locations where fires are likely to occur, all
hydraulic tubing shall be corrosion-resistant steel, unless the tubing is
separated from the engine or potential fire area by a flametight barrier.
Where separable tube fittings are required, they shall be corrosion-
resistant or carbon steel.
30
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