Double Ferrule Fittings
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Description:
Tube fittings provides a metal to metal seal between tube and ferrules. These fittings are well known as double ferrule fittings or instrumentation fittings that has a generic design that has been used in industry since 1940s. Instrumentation fittings are supplied in a wide range of applications such as shipbuilding, oil and gas, chemical, fuel, and power generation. The available materials for twin ferrule fittings are stainless steel and brass, with a working pressure for double ferrule fittings up to 670 Bar, depending on tube wall thickness and tube material. Fittings available are also equivalent to Swagelok or Parker Alok fittings. Features:
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Tube Fittings Product Information
Twin Ferrule Tube Fittings
Specifications:
Tube Fittings are designed, to meet the specifications required by industrial applications. These fittings are normally supplied, for shipbuilding, pharmaceutical, chemical processing, power generation, and oil and gas applications. Twin Ferrule fittings are also known as Double Ferrule fittings or instrumentation fittings.
A double ferrule fitting is made up of four components, which are fitting body, back ferrule, front ferrule, and nut. The two ferrule design provides outstanding leak-tight connections as it has better tube-gripping action and improved resistance to vibration. In a twin ferrule fitting design, the back ferrule moves the front ferrule forward to spring-load the fitting assembly and seal with the fitting body, and create the tubing seal. The back ferrule also swages the tube to provide the grip needed to keep the fitting and tubing in place.
Material:
Double Ferrule tube fittings are available in Stainless Steel, Steel and Brass Material. Additional processing had been carried out, to protect fittings from corrosion. The additional process is passivization (stainless steel), white zinc electroplating with chrome VI free (steel), and acid cleaning (brass).
Tube Fittings are designed, to meet the specifications required by industrial applications. These fittings are normally supplied, for shipbuilding, pharmaceutical, chemical processing, power generation, and oil and gas applications. Twin Ferrule fittings are also known as Double Ferrule fittings or instrumentation fittings.
A double ferrule fitting is made up of four components, which are fitting body, back ferrule, front ferrule, and nut. The two ferrule design provides outstanding leak-tight connections as it has better tube-gripping action and improved resistance to vibration. In a twin ferrule fitting design, the back ferrule moves the front ferrule forward to spring-load the fitting assembly and seal with the fitting body, and create the tubing seal. The back ferrule also swages the tube to provide the grip needed to keep the fitting and tubing in place.
Material:
Double Ferrule tube fittings are available in Stainless Steel, Steel and Brass Material. Additional processing had been carried out, to protect fittings from corrosion. The additional process is passivization (stainless steel), white zinc electroplating with chrome VI free (steel), and acid cleaning (brass).
Size Range & Pressure Rating:
Twin Ferrule fittings, are measured in metric (mm) and inches sizes ("OD). The metric sizes range from 2mm to 50mm, while inches sizes range from 1 1/16"OD to 2"OD. The pressure rating, is determined by the tubes’ wall thickness, with varying tube materials. For more information regarding the working pressure, please refer to HSME M Tube Fittings.
Fitting Assembly Instruction:
Before inserting the tube into the fittings, make sure that the tube ends are well prepared, and then lightly deburr the inner and outer diameters. After that, insert the tube, until it reach the ends of the fitting shoulder, and hand-tighten with the nut. Scribe the nut vertically at 6 o’clock position, and wrench tighten with 1 1/4 turns horizontally, while holding the body firmly with a second wrench.
Twin Ferrule fittings, are measured in metric (mm) and inches sizes ("OD). The metric sizes range from 2mm to 50mm, while inches sizes range from 1 1/16"OD to 2"OD. The pressure rating, is determined by the tubes’ wall thickness, with varying tube materials. For more information regarding the working pressure, please refer to HSME M Tube Fittings.
Fitting Assembly Instruction:
Before inserting the tube into the fittings, make sure that the tube ends are well prepared, and then lightly deburr the inner and outer diameters. After that, insert the tube, until it reach the ends of the fitting shoulder, and hand-tighten with the nut. Scribe the nut vertically at 6 o’clock position, and wrench tighten with 1 1/4 turns horizontally, while holding the body firmly with a second wrench.
Tube Fittings Pressure Ratings
Working Pressure of the fittings is rated to the working pressure of tubing as listed in the tubing tables. Pressure ratings are based on fully annealed seamless stainless steel tubing ASTM A269/A213 and TP 316/316L, 304/304L or equivalent. Tubes are to be free from scratches and suitable for bending and flaring with hardness 90 HRB or less.
Allowable working pressures are calculated using S value of 20 000psi (1378 bar) for ASTM A269 tubing at -20 to 100°F (-28 to 37°C) as listed in ASME B31.3 Process Piping Code and ASME B31.1 Power Piping Code.
Allowable working pressures are calculated using S value of 20 000psi (1378 bar) for ASTM A269 tubing at -20 to 100°F (-28 to 37°C) as listed in ASME B31.3 Process Piping Code and ASME B31.1 Power Piping Code.
Table 1. Fractional Seamless Stainless Steel Tubing
Working pressure are shown in psi.
Working pressure are shown in psi.
Tube OD (in) |
WT(in) 0.028" |
WT(in) 0.035 |
WT(in) 0.049 |
WT(in) 0.065 |
WT(in) 0.083 |
WT(in) 0.095 |
WT(in) 0.109 |
WT(in) 0.120 |
WT(in) 0.134 |
WT(in) 0.156 |
WT(in) 0.188 |
1/8 |
8500 |
10900 |
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3/16 |
5400 |
7000 |
10200 |
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1/4 |
4000 |
5100 |
7500 |
10200 |
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5/16 |
4000 |
5800 |
8000 |
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3/8 |
3300 |
4800 |
6500 |
8600 |
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1/2 |
2600 |
3700 |
5100 |
6700 |
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5/8 |
2900 |
4000 |
5200 |
6000 |
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3/4 |
2400 |
3300 |
4200 |
4900 |
5800 |
6400 |
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1 |
2400 |
3100 |
3600 |
4200 |
4700 |
5300 |
6200 |
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1 1/4 |
2400 |
2800 |
3300 |
3600 |
4100 |
4900 |
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1 1/2 |
2300 |
2700 |
3000 |
3400 |
4000 |
4900 |
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2 |
2000 |
2200 |
2500 |
2900 |
3600 |
Table 2. Metric Seamless Stainless Steel Tubing
Working pressure are shown in bar.
Working pressure are shown in bar.
Tube OD (mm) |
WT(mm) 1.0 |
WT(mm) 1.5 |
WT(mm) 2.0 |
WT(mm) 2.5 |
WT(mm) 3.0 |
WT(mm) 3.5 |
WT(mm) 4.0 |
WT(mm) 4.5 |
WT(mm) 5.0 |
6 |
420 |
670 |
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8 |
310 |
490 |
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10 |
240 |
380 |
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12 |
200 |
310 |
430 |
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14 |
180 |
280 |
390 |
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15 |
170 |
260 |
360 |
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16 |
240 |
330 |
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18 |
210 |
290 |
370 |
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20 |
190 |
260 |
330 |
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22 |
170 |
230 |
300 |
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25 |
200 |
260 |
320 |
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28 |
180 |
230 |
280 |
330 |
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30 |
170 |
210 |
260 |
310 |
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32 |
160 |
200 |
240 |
290 |
330 |
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38 |
170 |
200 |
240 |
280 |
310 |
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42 |
180 |
210 |
250 |
280 |
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50 |
150 |
180 |
200 |
230 |
260 |
Tube Fittings Temperature Rating
Tube Fittings temperature ratings vary in accordance to the body material as per below:
Body Material Temperature Rating
There are reductions in the nominal pressure (PN) caused by the temperature of the fluid medium or surroundings. Please refer to the table below:
Body Material Temperature Rating
There are reductions in the nominal pressure (PN) caused by the temperature of the fluid medium or surroundings. Please refer to the table below:
38°C |
93°C |
149°C |
204°C |
260°C |
316°C |
343°C |
371°C |
1 |
1 |
0.97 |
0.9 |
0.85 |
0.84 |
0.82 |
0.81 |
399°C |
427°C |
454°C |
482°C |
510°C |
538°C |
566°C |
593°C |
0.81 |
0.80 |
0.79 |
0.78 |
0.77 |
0.77 |
0.73 |
0.62 |
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When combing seal material, the temperature rating of seal may become the limiting factor on the fitting's temperature rating. Kindly refer to the temperature rating below:
Elastomer's Temperature Rating
Elastomer's Temperature Rating
- NBR: -25°C to 110°C (Default Option)
- Viton: -28°C to 204°C
- PTFE: -30°C to 315°C
IMPA Code: Stainless Steel Flareless Fittings
Twin Ferrule Fittings, which are also called flareless fittings can be found in the IMPA Marine Stores Guide, which is the world’s leading reference guide for maritime purchasing and supply. For details on the reference codes of flareless fittings, please kindly see below:
Stainless Steel Flareless Male Connector
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Stainless Steel Flareless Male Connectors:
IMPA CODE: 734301 6MM OD x 1/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734302 6MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734303 6MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734304 6MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734305 8MM OD x 1/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734306 8MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734307 8MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734308 8MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734309 10MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734310 10MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734311 10MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734312 12MM OD x 1/4" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734313 12MM OD x 3/8" NPT SS316 MALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734314 12MM OD x 1/2" NPT SS316 MALE CONNECTOR (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Male Connectors, please click here. |
Stainless Steel Flareless Male Elbow
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Stainless Steel Flareless Male Elbows:
IMPA CODE: 734321 6MM OD x 1/8" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734322 6MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734323 6MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734324 6MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734325 8MM OD x 1/8" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734326 8MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734327 8MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734328 8MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734329 10MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734330 10MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734331 10MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734332 12MM OD x 1/4" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734333 12MM OD x 3/8" NPT SS316 MALE ELBOW (TWIN FERRULE) IMPA CODE: 734334 12MM OD x 1/2" NPT SS316 MALE ELBOW (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Male Elbows, please click here. |
Stainless Steel Flareless Female Connector
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Stainless Steel Flareless Female Connectors
IMPA CODE: 734371 6MM OD x 1/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734372 6MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734373 6MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734374 6MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734375 8MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734376 8MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734377 8MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734378 10MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734379 10MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734380 10MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734381 12MM OD x 1/4" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734382 12MM OD x 3/8" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) IMPA CODE: 734383 12MM OD x 1/2" NPT SS316 FEMALE CONNECTOR (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Female Connectors, please click here. |
Stainless Steel Flareless Union
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Stainless Steel Flareless Unions
IMPA CODE: 734401 6MM OD SS316 UNION COUPLING (TWIN FERRULE) IMPA CODE: 734402 8MM OD SS316 UNION COUPLING (TWIN FERRULE) IMPA CODE: 734403 10MM OD SS316 UNION COUPLING (TWIN FERRULE) IMPA CODE: 734404 12MM OD SS316 UNION COUPLING (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Unions, please click here. |
Stainless Steel Flareless Reducing Unions
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Stainless Steel Flareless Reducing Unions
IMPA CODE: 734406 6MM OD x 8MM OD SS316 UNION COUPLING (TWIN FERRULE) IMPA CODE: 734407 8MM OD x 10MM OD SS316 UNION COUPLING (TWIN FERRULE) IMPA CODE: 734408 10MM OD x 12MM OD SS316 UNION COUPLING (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Reducing Unions, please click here. |
Stainless Steel Flareless Bulkhead Unions
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Stainless Steel Flareless Bulkhead Unions
IMPA CODE: 734411 6MM OD SS316 BULKHEAD UNION (TWIN FERRULE) IMPA CODE: 734412 8MM OD SS316 BULKHEAD UNION (TWIN FERRULE) IMPA CODE: 734413 10MM OD SS316 BULKHEAD UNION (TWIN FERRULE) IMPA CODE: 734414 12MM OD SS316 BULKHEAD UNION (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Bulkhead Unions, please click here. |
Stainless Steel Flareless Tee Unions
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Stainless Steel Flareless Tee Unions
IMPA CODE: 734416 6MM OD SS316 UNION TEE (TWIN FERRULE) IMPA CODE: 734417 8MM OD SS316 UNION TEE (TWIN FERRULE) IMPA CODE: 734418 10MM OD SS316 UNION TEE (TWIN FERRULE) IMPA CODE: 734419 12MM OD SS316 UNION TEE (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Tee Unions, please click here. |
Stainless Steel Flareless Nut
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Stainless Steel Flareless Nut
IMPA CODE: 734431 6MM OD SS316 UNION NUT (TWIN FERRULE) IMPA CODE: 734432 8MM OD SS316 UNION NUT (TWIN FERRULE) IMPA CODE: 734433 10MM OD SS316 UNION NUT (TWIN FERRULE) IMPA CODE: 734434 12MM OD SS316 UNION NUT (TWIN FERRULE) For Catalogue Pages of Stainless Steel Flareless Nut, please click here. |
Stainless Steel Front Ferrule
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Stainless Steel Front Ferrule
IMPA CODE: 734436 6MM OD SS316 FRONT FERRULE (TWIN FERRULE) IMPA CODE: 734437 8MM OD SS316 FRONT FERRULE (TWIN FERRULE) IMPA CODE: 734438 10MM OD SS316 FRONT FERRULE (TWIN FERRULE) IMPA CODE: 734439 12MM OD SS316 FRONT FERRULE (TWIN FERRULE) For Catalogue Pages of Stainless Steel Ferrule Front & Rear, please click here. |
Stainless Steel Back Ferrule
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Stainless Steel Rear Ferrule
IMPA CODE: 734441 6MM OD SS316 BACK FERRULE (TWIN FERRULE) IMPA CODE: 734442 8MM OD SS316 BACK FERRULE (TWIN FERRULE) IMPA CODE: 734443 10MM OD SS316 BACK FERRULE (TWIN FERRULE) IMPA CODE: 734444 12MM OD SS316 BACK FERRULE (TWIN FERRULE) For Catalogue Pages of Stainless Steel Rear Ferrule, please click here. |
Catalogue available in pdf
Twin Ferrule Fittings
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