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Instrument Fittings

Double Ferrule Compression Tube Fittings

Introduction

Kurat 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

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)
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)

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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www.instrumentationfittings.com

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Disclaimer : The information contained herein is accurate to the best knowledge and belief of Kurat Enterprise, and specification quoted may change without prior notice. Information contained in this technical literature is believed to be accurate and is offered in good faith for the benefit of the customer. More...

   
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