Double Ferrule Compression Tube Fittings
Introduction
Machine Tools Syndicate range of double ferrule fittings work on the proven principle of two ferrules swaging to the tube when tightened. As the nut is tightened the front ferrule swages on to the tube making a prominent leak-proof seal and the back ferrule makes a positive impression on the tube with the help of back cone of front ferrule hence making a strong hold on the tube. Make and remake of the fittings is very much eased, as nuts are silver plated internally to prevent galling of threads. The identification between Metric and Inch fittings is made very simple with the help of stepped shoulders in metric fittings.
Material
The standard material that is used in making range of instrumentation fittings and tube fittings is SS316. These are also made in brass, Monel, Hastalloy, and Incoly as and when required by the customer. Various International Material Standards are used for conforming the chemical requirements of the raw material.
Typical raw material specifications head
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Material |
Bar |
Forging |
Stainless steel |
BS970 316-S31 |
BS970 316-S31 |
DIN 4401 |
DIN 4401 |
|
ASME SA479-316 |
ASME SA182-316 |
|
Brass |
BS2874 CZ121 |
BS2872 CZ 122 |
ASTMB 16 Alloy 360 |
ASTMB124 ALLOY 377 |
|
ASTMB 453 Alloy 345 |
||
Monel |
BS3076 NA13 |
BS3076 NA13 |
ASTMB164 |
ASTMB164 |
|
High Duty Bronze |
DGS 1043 Grade 2 |
DGS 1043 Grade 2 |
Hastelloy C276 |
ASTMB575 |
ASTNB574 |
Incoly 825 |
BS3076 NA16 |
BS3076 NA16 |
ASTMB425 |
ASTMB425 |
|
6Mo |
UNS S31254 |
UNS S31254 |
ASTM A479 |
ASTM A479 |
|
Raw Material Reference
Tubing Selection
Proper selection, handling, installation of tubing in combination with range of instrumentation fittings and tube fittings are very much essential to ensure a perfect leak-proof joint. Selection of tubes is based on the material hardness, wall thickness and surface finish.
Tubing Selection Data (Metric/ Inch) for maximum working pressure Recommended maximum working pressures (bar) for 316 stainless steel and 6Mo tubes to ASTM A-269. (in inches)
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| Outside Diameter Of tube (inch) |
Tube wall thickness (Swg/inch) | |||||||
| 33/.010 | 30/.012 | 22/.028 | 20/.036 | 18/.048 | 16/.064 | 14/.080 | 12/.104 | |
| 1/16 | 385 | 465 | 680 | 865 | ||||
| 1/8 | 345 | 515 | 600 | 805 | ||||
| 1/4 | 265 | 315 | 465 | 635 | ||||
| 5/16 | 205 | 275 | 380 | 515 | ||||
| 3/8 | 170s | 205 | 275 | 380 | 480 | |||
| 1/21 | 155 | 205 | 275 | 380 | 450 | |||
| 5/8 | 120 | 170 | 240 | 310 | 380 | |||
| 3/4 | 105 | 140 | 195 | 245 | 300 | |||
| 7/8 | 85 | 120 | 170 | 225 | 240 | |||
| 1 | ||||||||
The working pressures in the above table are based on actual tests on ASTM A-269 tubing with a safety factor of 4:1. They apply to a metal temperature range of -20°to + 100°C.
For working pressures of monel tubing, multiply the above ratings by 0.8.
Recommended maximum working pressures (bar) for 316 stainless steel and 6Mo tubes to ASTM A-269(in metric)
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| Outside Diameter Of tube (mm) |
Tube wall thickness (mm) | |||||||
| 0.5 | 0.7 | 1.0 | 1.5 | 2.0 | 2.5 | 3.0 | ||
| 2 | 700 | 660 | ||||||
| 3 | 450 | 480 | 685 | |||||
| 4 | 275 | |||||||
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