Purpose
For use in applications where the temperature of the process fluid must be regulated as it passes through the hose. In some applications, an additional ‘melt out’ facility may also be required.
Description
The heating element comprises self-regulating element spirally wrapped around the hose assembly. Self-regulating elements may require a sensor and controller if a specific maintain temperature is required. Please consult Aflex Hose for clarification. The power leads and (if applicable) temperature sensor leads emerge from the hose assembly at one end, through glands and conduits. The thermal insulation is foam rubber, silicone foam rubber. The outer cover a SS wire braid with a blue or EPDM rubber cover.
Design
Each hose is custom designed and built. Application details must be supplied by filling in an “ETH Hose Questionnaire”, available from the website. Generally, for hazardous areas, particularly “Zone 1”, the self-regulating type of heating element is employed, with or without a temperature sensor and control, and flameproof glands and conduit are also required. The watts per metre of the heating element, the pitch of the spiral on the hose, and the thickness of the thermal insulation are all calculated in accordance with established formulae to give the required maintained temperature.
Specifications
As for FaBLINE in Specifications, except that the minimum bend radius is tripled and the outside diameter and weight are significantly increased in line with the particular design. The maximum length of an ETH hose is 10m (33ft).
Limitations
1” PTFE lined PN10 flange spigots on heated hoses can only have a maximum flare diameter of 50mm, not 63mm. If the hose is “hanging”, straight or at 90˚, under its own weight, special construction is required, so advise Aflex Hose accordingly. Minimum ETH Hose assembly length, when collars are used 1mtr.
ETH Hose Assembly 
Specify all requirements in order shown below:
- Quantity
- Hose size
- PTFE Liner
- Braid
- External Cover
- Protection system
- Length
- End fittings
Example |
Written description |
4 off x 1” bore FaBLINE, AS, SS, RC, x 3.00 metres long. Both ends non-lined ANSI 150# S/S Flanges |
Part numbers |
4 off Part No. 16-AFXF/AS-RC-00-3.00m-12-12 |
Special requirements:
- Hose construction
- Tagging information
- Certification
- Special testing
Specify full written description on enquiry or purchase order:
Hose Grades
PTFE liner |
Braids |
Rubber covers |
Natural (GP) |
316 stainless steel (SS) |
Rubber cover (RC) |
Antistatic (AS) |
|
Platinum cured silicone (SI) |
|
|
Blue EPDM rubber cover (BK) |
External protections available – see braid, covers and end fittings page.
FabLine assembly length and limitations
LISTED MINIMUM LENGTHS DO NOT INCLUDE FITTINGS.
Hose length + end fittings = Total hose assembly length (sealing face to sealing face)
Lengths made to customer requirement.
Tolerance +2 %/-0 %. Closer tolerances available to special order.
Nominal Size of Hose |
Minimum Hose Length Used Straights |
Minimum Hose Length Flexed through 90 ° |
Maximum Hose Assembly Length |
in |
dn |
in |
mm |
in |
mm |
ft |
mtrs |
1/4 |
6 |
3 |
75 |
3 |
75 |
100 |
30 |
3/8 |
10 |
3 |
75 |
3 |
75 |
100 |
30 |
1/2 |
15 |
3 |
75 |
3 |
75 |
100 |
30 |
5/8 |
16 |
3 |
75 |
3 |
75 |
100 |
30 |
3/4 |
20 |
3 |
75 |
4 |
100 |
100 |
30 |
*7/8 |
22 |
3 |
75 |
4 |
100 |
100 |
30 |
1 |
25 |
4 |
75 |
4.33 |
110 |
100 |
30 |
11/4 |
32 |
4 |
100 |
6.3 |
160 |
100 |
30 |
*1 3/8 |
35 |
4 |
100 |
7.48 |
190 |
100 |
30 |
1 1/2 |
40 |
4 |
100 |
8.66 |
220 |
100 |
30 |
*1 7/8 |
48 |
4 |
100 |
11.81 |
300 |
100 |
30 |
2 |
50 |
4 |
100 |
12.4 |
315 |
100 |
30 |
21/2 |
65 |
4 |
100 |
18.7 |
475 |
60 |
18 |
3 |
80 |
4 |
100 |
21.65 |
550 |
50 |
15 |
End Fittings
Large range of ‘standard’ end fittings available.
Special order—non-standard grades of SS or materials such as Hastelloy or Monel.
Specification Equivalents |
Grade |
BS British Standard |
AISI American Standard or C = Casting Grade |
EN European Norm |
316L SS |
BS 316 S11 |
AISI 316 L |
EN1.4404 |
316C SS |
BS 316 C16 |
CF8M |
EN 1.4408 |
304 SS |
BS 304 S15 |
AISI 304 |
EN 1.4301 |