Performance and Service | Flexible Braided Hoses
PERFORMANCE See Table A for the shortest recommended overall length (OAL) for each size. This is the minimum length required for the listed maximum vibration, maximum static offset, and minimum bend radii when using any combination of end types. Lengths shorter than what are listed in the following table are not recommended . VELOCITY 8773 braided hose are rated for 150 ft/sec gas (75 ft/sec liquid) maximum. When the hose is installed in a bent condition, these flow values should be reduced by 50% for a 90° bend, 25% for a 45° bend, and so on, proportional to the angle of bend.
In cases where velocity exceeds the above values, hoses with flexible metal liners can be special ordered. The next larger size corrugated hose would be used with the flexible metal liner size equivalent to the mating pipe size. PRESSURE DROP Pressure drop through a corrugated metal hose is approximately three times that in comparable size standard steel pipe.
Table A
Minimum Bend Radius
Minimum Recommended
Minimum Recommended
Minimum Bend Radius Static Bend (inches)
Nominal Hose
Intermittent OAL (inches) for ½" OAL (inches) fo r ¼"
Braided Hose 8773-01 8773-0 8773-1 8773-2 8773-3 8773-4 8773-5 8773-6 8773-7 8773-8 8773-9 8773-10 8773-12
Hose OD (inches)
Weight lb per ft
Flexing (inches)
max. vibration or max. vibration or
Size
1 ½" static offset
½" static offset
½ " ¾ "
.90
.38 .67 .93
1.5
6 8 9
9 9
- - - - - - - - - -
1.27 1.59 1.92 2.27 2.01 3.12 3.60 4.84 7.19 9.31 11.44 13.50
2.125 2.75
1"
10 12 12 15 16 18 21 25
1 ¼ " 1 ½ "
1.20 1.85 2.44 2.19 2.70 3.34 6.20 12.93 13.54 16.94
3.25 3.75
10.5
12 15 14 17
2"
5.0 7.0
2 ½ "
3" 4" 6"
8.25
11.0 16.5 21.5 27.0 32.0
22 33 43 54 64
8"
- - -
25 28 30
10" 12"
SERVICE
8773 Flexible braided hoses can be used with natural gas, oil, steam, compressed air, and other gases or fluids that are compatible with the materials of construction. Hoses ordered for oxygen service are factory degreased and cleaned for oxygen applications.
upon variables such as installation technique, temperature, pressure, movement, vibration, cycle count, external damage, fluid type, and the amount of corrosives in the fluid.
The corrosion resistance of the 321 SST material must be considered when exposure to "dirty" gases is possible.
Special certified hoses can be special ordered for aplications that require conformity to ANSI B31 piping codes.
The products of combustion from fluxed aluminum melters contain water vapors, chlorides and fluorides and are known to attack 321 SST flexes when used in such applications Contact North American for corrosion resistant solutions and availability of alternate materials like Hastelloy C-276 with special Lap Joint 304 stainless steel plate flanges.
Flanged hoses selected for oxygen service or hoses requiring ANSI B31 conformity must always use end type “R” (fixed raised face flange) end connections. 8773 flexible hoses are applicable for the majority of combustion systems and when installed and used properly can last many years. Life expectancy will vary by application and is dependent
Bulletin 8773 Page 4
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