Flexible Helical Hose - one or two braids
Helical hose is fabricated in a continuous spiral corrugation and has a unique property of self-draining. It can be designed with standard pitch, open pitch and super flex for different requirements of flexibility. Corrugated hose and reinforcement are available in stainless steel 304, 321, 316L.
This flexible braided hose is adequate to sever hydraulic applications with its wide range of working temperatures from cryogenic to 662 °F (350 °C) and high working pressure up to 3625 psig (250 bar).
Flexible stainless helical hose provides three types - unbraided, single braided, and double braided. All the data in the table below are all tested at 70 °F. Please consult temperature correction table for practical applications.
Technical parameters
| Flexible stainless helical hose, 304, 321, 316L |
Nominal
Hose
Size (in.) | Hose Type | Braid
Layers/
Type | Nominal
Outside
Diameter | Minimum Centerline
Bend Radius (in.) | Pressure Ratings
at 70 °F
(PSIG) | Weight
Per Foot
(lb.) | Typical
Mill Length
(ft.) |
| Static | Dynamic | Max.
Working | Max.
Test | Nominal
Burst |
| 1/4 | 100H
101H
102H | 0
1
2 | 0.44
0.49
0.54 | 4 | 6 | 140
2625
3625 | 210
3938
5438 | —
10500
14500 | 0.08
0.17
0.26 | 30–100 |
| 3/8 | 100H
101H
102H | 0
1
2 | 0.60
0.66
0.72 | 2 | 4 | 100
1650
2200 | 150
2475
3300 | —
6600
8800 | 0.12
0.23
0.35 | 30–100 |
| 1/2 | 100H
101H
102H | 0
1
2 | 0.73
0.78
0.84 | 3 | 5 | 75
1100
1750 | 113
1725
2625 | —
4600
7000 | 0.16
0.26
0.37 | 30–100 |
| 3/4 | 100H
101H
102H | 0
1
2 | 1.00
1.05
1.11 | 4 | 6 | 50
800
1250 | 75
1200
1875 | —
3600
4800 | 0.24
0.41
0.60 | 30–100 |
| 1 | 100H
101H
102H | 0
1
2 | 1.28
1.36
1.44 | 4.5 | 7 | 50
750
1050 | 75
1125
1575 | —
3000
4200 | 0.34
0.60
0.89 | 30–100 |
Flexible metal hose is a piping element used for conveying materials ranging from natural gas and oil to steam and engine exhaust. Its main advantages over solid tubing and piping are that it provides added protection against abrasion and pressure, and that it dampens vibration. In addition, flexible metal hose is far less susceptible to high temperatures and pressures than many other types of hoses.
Flexible metal hose is fabricated from a variety of corrosion-resistant metals, including stainless steel, aluminum alloys, and corrugated bronze. In the case of bronze hoses, the bronze tube is typically encased in a braided metal shielding, which provides added resistance to wear and pressure. These hoses are used for extremely high-temperature and high-pressure applications. Among the flexible hose designs available are helical hoses, which feature a screw shaped wind; annular hoses, which have a round, accordion-like, or ribbed, wind; and braided hoses, which consist of a central bronze tube and a weave of fine metal strands. Flexible metal hoses can also include a corrosion resistant liner.
Flexible metal hoses are integral components to a number of devices and applications. Perhaps the most visible uses are as refrigerant and natural gas lines, although flexible metal hose also finds use as piping for high-pressure water, and for various food-processing tasks. Many appliances, such as refrigerators, ovens and other heavy-duty devices, incorporate stainless steel (and other) hoses. Flexible metal hose is also useful for a variety of machines that run on, or utilize, compressed air.
Measurements for flexible metal hose are designated by pipe size, referred to as NPT, which is not the actual size of the pipe. Each NPT listing corresponds to an outer diameter (male fittings) and inner diameter (female fittings) measurement, and purchasers should consult with suppliers/manufacturers to determine the proper hose needed. Length and pressure rating can also be addressed.
Application
1) Central air-conditioning
2) Diesel engine (ship) exhaust line
3) Long distance pipeline such as Gas, steam, water etc.
4) Thermal expansion in Steel mill
5) Pipelines
6) Turbines
7) Compressors
8) Blowers
9) Vacuum pumps
10) Heat exchangers
11) Hot water and fire protection system
12) Compressors inlet and outlet
1) Easy to absorb the expansion movements
2) No direction changes of the flow
3) Minimum application area
4) Possible lateral and angular expansion absorption by the additional bellows.
5) To provide a non-stressed area where the pressure is not too high such as pump and compressor applications.
6) Low application costs
