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DOUBLE FERRULE FITTINGS

BAHASA INDONESIA
Material Specification
  • Brass
  • Carbon Steel, Zinc
  • Stainless Steel SS316
Connection Type
  • Compression end
Size
  • 1/8” OD to 2” OD
Working Pressure
  • Up to 670 bars
Double ferrule fittings also are known as tube fittings are special fitting types used for tightening tubes to prevent leakage of the pipeline. The double ferrule fittings are made from brass and stainless steel (SS316) materials. These fittings are also known as instrumentation fitting and are produced in sizes ranging from 1/8” to 2” and 6mm to 42mm in outer diameter (OD). 

The double ferrule fittings have a maximum working pressure of 670 Bar, and measurement is based on the tube material and thickness of the tube wall. Double ferrule fittings are used in a variety of industries like oil and gas, chemical, fuel, etc. majorly, these fittings are used for metal to metal sealing of tubes. The body design comes straight with stepped shoulders and nuts.

STUDY CATALOGUE HERE


-->  DOUBLE FERRULE FITTINGS

-->  ​HSME Double Ferrule

1. What is a Double Ferrule Fitting?

SS316 Union Tee
SS316 Union Tee
Double ferrule fittings are fittings used to seal metal to metal connection. These fittings are also known as instrumental fittings or tube fittings. They are produced according to the specifications of the industry intended for. The complete double ferrule fitting has four components which are the body, nuts, front ferrule, and back ferrule. 

After installation, a tube is added and this makes up whole 5 components for the double ferrule fittings. History has it that the design of the double ferrule fittings has been in the industry since 1945 and the popular market brands available are made in the USA by Parker A-lok and Swagelok. 
​
​The double ferrule fittings are commonly available in Stainless steel and Brass materials. A few times, the steel material could also be used for production. To increase the corrosion resistance of the fittings and durability level, some processes are carried out. They are Passivation with stainless steel, acid cleaning with brass, and white zinc electroplating with chrome VI free or steel.

2. How does a Double Ferrule Fitting work?

The double ferrule fitting works based on some factors. The factors that can affect the working pressure of the fittings are:
  • Fitting Material​
Here’s a table showing the elevated temperature de-rating factors:
Temperature ⁰F (⁰C)
Brass
Stainless Steel SS316
100 (38)
1.00
1.00
200 (93)
0.80
1.00
300 (149)
0.78
1.00
400 (204)
0.50
0.97
500 (260)
0.13
0.90
600 (316)
-
​0.85
700 (371)
-
0.82
800 (427)
-
0.80
900 (482)
-
0.78
1000 (538)
-
0.77
1200 (649)
-
0.37
SS316 Reducing Union
SS316 Reducing Union
An illustration for this table can be used for a tube under room temperature with an outer diameter size of 10mm x 1.5mm fitting and thickness can accommodate a working pressure of a maximum of 380 Bar. But, when the temperature changes to 371C or 700F, as a result of the de-rating factor of 0.82, the working pressure also reduces to 311.6 Bar. This drop-in working pressure will have an impact (negatively) on the effectiveness of the system.

  • Tubing wall thickness
Double ferrule tube fittings are measured to the highest working pressure based on the thickness of the wall tubes because it controls the working pressure of the tubes.

​The table below shows the working pressure for SS316 (Fractional Seamless Stainless Steel) (ASTM A269/A213)
Tube
OD
​(inch)
WT (inch) 
​
0.028”
WT (inch) 
​
0.035”
WT (inch) 
​
0.049”
WT (inch) 
​
0.065”
WT (inch) 
​
0.083”
WT (inch) 
​
0.095”
WT (inch) 
​
0.109”
WT (inch) 
​
0.120”
WT (inch) 
​
0.134”
WT (inch) 
​
0.156”
WT (inch) 
​
0.188”
1/8”
8500
10900
-
-
-
-
​-
-
-
-
-
3/16”
5400
7000
10200
-
-
-
-
-
-
-
-
1/4”
4000
5100
7500
10200
-
-
-
-
-
-
-
5/16”
-
4000
5800
8000
-
-
-
-
-
-
-
3/8”
-
3300
4800
6500
8600
-
-
-
-
-
-
1/2”
-
2600
3700
5100
6700
-
-
-
-
-
-
5/8”
-
-
2900
4000
5200
​6000
-
-
-
-
-
3/4”
-
-
2400
3300
4200
4900
5800
6400
-
-
-
7/8”
-
-
2000
2800
3600
4200
4800
5400
6100
-
-
1”
-
-
-
2400
3100
3600
4200
4700
5300
6200
-
1 1/4”
-
-
-
-
2400
2800
3300
3600
4100
4900
-
1 1/2”
-
-
-
-
-
2300
2700
3000
3400
4000
4900
2”
-
-
-
-
-
-
2000
2200
2500
2900
3600
To calculate allowable pressure, the parameters to use are the maximum outer diameter and minimum wall thickness. For instance, a stainless steel tube with an outer diameter (OD) size of ½” x 0.035 thickness can accommodate a maximum working pressure of 2600 PSI. Thus, the double ferrule fittings that can be used for the tube compression is a maximum of 2600 PSI.

​The table below shows the Working pressure for Metric Seamless Stainless Steel SS315 tubing (ASTM A269/A213).
​Tube
OD
​(mm)
WT (mm) 1.0
WT (mm) 1.2
WT (mm) 1.5
WT (mm) 1.8
WT (mm) 2.0
WT (mm) 2.2
WT (mm) 2.5
WT (mm) 2.8
WT (mm) 3.0
WT (mm) 3.5
WT (mm) 4.0
WT (mm) 4.5
WT (mm) 5.0
6
420
520
670
-
-
-
-
-
-
-
-
-
-
8
310
380
490
-
-
-
-
-
-
-
-
-
-
10
240
300
380
-
-
-
-
-
-
-
-
-
-
12
200
240
310
380
430
-
-
-
-
-
-
-
-
15
180
220
280
340
390
430
-
-
-
-
-
-
-
16
170
200
260
320
360
400
-
-
-
-
-
-
-
18
-
190
240
300
330
370
-
-
-
-
-
-
-
20
-
170
210
260
290
320
370
-
-
-
-
22
-
150
190
230
260
290
330
380
-
-
-
25
-
130
170
210
230
260
300
340
320
-
-
-
28
-
-
-
180
200
230
260
300
280
330
-
-
30
-
-
-
-
180
200
230
260
260
310
Value
-
-
32
-
-
-
-
170
190
210
240
240
290
330
-
-
38
-
-
-
-
160
170
200
230
230
240
380
310
-
42
-
-
-
-
-
160
200
200
180
210
250
280
50
-
-
-
-
-
-
-
150
180
200
230
260
Here’s another illustration, a stainless steel SS316 with an outer diameter size of 10mm x 1.5mm thickness will accommodate a maximum working pressure of 380 Bar. 
​
  • Fitting Seal
The temperature level of an O-ring sealed with elastomer can reduce the fitting’s temperature level. The table below shows the O-ring temperature ratings:
SS316 Red Union Coupling
SS316 Red Union Coupling
Elastomer Seal Material
Working Temperature
PTFE (Teflon)
-30C – 315C (-22⁰F – 600⁰F)
NBR (Perbunan)
-25C – 110C (-13⁰F – 230⁰F)
FKM (Viton)
-28C – 204C (-20⁰F – 400⁰F)
A tube with an outer diameter size of 10mm x 1.5mm thickness, sealed with NBR, can perfectly work with a temperature between -25⁰C to 110⁰C. 

BAHASA INDONESIA

3. What is the purpose of a Ferrule Fitting?

The double ferrule fitting is suitable for use in different applications. More so, the fitting is easy to install. The connections can be done without welding or threaded ends. This also helps reduce cost and the fittings are reusable. The advantages of double ferrule fittings are:
  • High resistance to corrosion and chemical exposure
  • Ability to withstand high pressure and temperatures
  • High ductility and strength 
  • Ability to withstand exposure to harsh weather and environment.

​The double ferrule fittings are applied in the following industries:
  • Pharmaceutical industry
  • Refineries
  • Shipbuilding
  • Oil and Gas industry
  • Instrumentation
  • Vacuum application, etc.
Front Ferrule
Front Ferrule
Back Ferrule
Back Ferrule

4. How do you fit a Double Ferrule Fittings?

Installation double fittings are critical to creating a reliable connection. Please refer to the ferrule fitting assembly guideline below: 

STEP 1
Remove all substances like dirt and other contaminants from the tube surface. Then, cut the tube to the desired length.

STEP 2
Take out the nut and ferrules from the fittings end connection and discard the ferrules. 

STEP 3
Place the tube into the double ferrule fitting. Also, ensure the tube is well inserted into the fitting.

STEP 4
While holding the fitting body steady, hand tightening the nut 1/4 turns. For small-size fitting bodies like 1/16”, 1/8”, 3/16”, 2mm, 3mm, 4mm, tighten the nut 1/8 turn.

STEP 5
Insert the tube fitting until it rests firmly on the shoulder of the tube fitting body. Using your hand, tighten the nut to the fitting assembly. Ensure you do not over tighten the nut to avoid damage to the fittings. For tube size bigger than 1” or 25mm, remove and discard the nuts and ferrules from the fitting set, followed by inserting the preswaged tube adapter. 

STEP 6
​Mark the nut at 6 o’clock position and while holding fitting body, tighten the nut 1 1/4 turns to the 9 o’clock position. 

DOUBLE FERRULE FITTINGS CATALOGUE
​RFS Double Ferrule Fittings
​HSME Double Ferrule Fittings

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SS316 Reducing Union
SS316 Reducing Union
BAHASA INDONESIA

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