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Well-Lok Twin Ferrule / Fine-Lok Single Ferrule Tube Fittings
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SEALEXCEL Fine-Lok®/ Well-LokTM Tube fittings have been carefully designed and manufactured with continuous research and development backing to very stringent tolerances under rigid Quality Control procedures approved to ISO 9001-2008 quality management systems to provide zero leak, Torque free seal in instrumentation and process tubing.

SEALEXCEL Fine-Lok®/ Well-LokTM Tube fittings ensures maximum safety and reliability due to Tests carried out such as High pressure, impulse, vibration, vacuum, temperature, pull out and burst pressure.


Material
SEALEXCEL Fine-Lok®/ Well-LokTM Tube fittings are available as standard stainless steel 316. The raw materials used confirm to chemical requirements listed in specification below,
BAR STOCK FORGING
ASME - SA -479, ASME-SA-182 316
TYPE 316 - SS BS970 316-S31
BS970 316 - S31 DIN 4401
DIN 4401
ASTMA276, TYPE 316

Heat Traceability
Stainless steel 316 Tube fittings are heat code traceable back to the original mill heat from which it was made.

Pressure Rating
SEALEXCEL Fine-Lok®/ Well-LokTM Tube fitting are rated for working pressure higher than the tubing recommended in tubing data table as shown below. However, tubing should not be used above its maximum allowed working pressure.

Tubing Selections
» Stainless steel 304 and 316 fully annealed seamless tubing according to standard ASTM A213 or ASTM A269 or equivalent, are suitable for use with Fine-Lok®/Well-LokTM tube fittings.

» The tubing should be compatible with the process fluid, pressure and temperature.

» For good performance of Fine-Lok®/Well-Lok TM tube fittings, the tubing should be reasonably round, free from nicks, scratches, the surface finish should be good and tube ends are squarely cut and must be free from burrs.

» The hardness of tubing as desired is 80Rb; the maximum allowed by ASTM is 90Rb.

Table 1 : TUBING DATA TABLES FOR FRACTIONAL SIZE
ALLOWABLE WORKING PRESSURE (PSI) WALL THICKNESS IN INCH
Tubing O.D. WALL THICKNESS IN INCH
.028 .035 .049 .065 .083 .095 .109 .120
1/8 8600 10900 - - - - - -
3/16 5500 7000 10300 - - - - -
1/4 4000 5100 7500 10300 - - - -
5/16 - 4100 5900 8100 - - - -
3/8 - 3300 4800 6600 - - - -
1/2 - 2600 3700 5100 6700 - - -
5/8 - - 3000 4000 5200 6100 - -
3/4 - - 2400 3300 4300 5000 5800 -
7/8 - - 2100 2800 3600 4200 4900 -
1 - - - 2400 3200 3700 4200 4700

Table 2: TUBING DATA TABLES FOR METRIC SIZE
ALLOWABLE WORKING PRESSURE IN BAR
Tubing O.D. WALL THICKNESS IN MILLIMETER
0.5 0.6 0.7 0.8 1.0 1.2 1.5 1.6 1.8 2.0 2.2 2.2 2.5 3.0
3 497 607 718 828 1032 - - - - - - - - -
6 - - 331 386 497 607 774 912 - - - - - -
8 - - 208 280 359 440 558 607 - - - - - -
10 - - 221 280 342 440 473 - - - - - -
12 - - 182 231 280 359 386 440 440 497 - - -
14 - - - 195 237 302 324 369 369 416 463 535 654
16 - - - 169 205 361 280 319 319 358 398 460 564
18 - - - 150 181 230 246 280 280 314 349 403 496
22 - - - 121 147 185 199 225 225 252 280 322 394
25 - - - - 108 128 162 173 196 196 220 244 280 342
Note : Working pressure (psig) for seamless tubing. Multiply pressure rating by 0.80 for single welded tubing. Multiply pressure rating by 0.85 for double welded tubing.

TABLE 3 : FACTORS USED TO DETERMINE ALLOWABLE PRESSURE AT HIGHER TEMPERATURES.
O F O C A.I.S.I. 316
200 93 1
400 204 0.96
600 316 0.85
800 427 0.79
1000 538 0.76
1200 649 0.37
For Example : The allowable pressure for type SS316, Size 1/4"OD x 0.035 wall at 600O F(316O C) would be equivalent to 5100 psi x 0.85 = 4335 psi.

Gas Service
» Extra care must be taken while selecting tubing for gas application, In order to achieve a gas-tight seal, ferrules in instruments fittings must seal any minor surface imperfections.
» The thick walled tubing helps the ferrules to overcome minor surface imperfections.
» SEALEXCEL ® recommends the following minimum wall thickness of tubing for gas application.

TABLE 4 : GAS APPLICATION TUBING
Tube OD
( Inches )
Nominal Minimum Wall Thickness ( Inches ) Tube OD
( Metric )
Nominal Minimum Wall Thickness ( Inches )
1/8" 0.028" 3 mm 0.8 mm
3/16" 0.028" 6 mm 0.8 mm
1/4" 0.028" 6 mm 1.0 mm
5/16" 0.035" 10 mm 1.0 mm
3/8" 0.035" 12 mm 1.0 mm
1/2" 0.049" 14 mm 1.2 mm
5/8" 0.065" 16 mm 1.5 mm
3/4" 0.065" 18 mm 1.5 mm
7/8" 0.083" 20 mm 1.8 mm
1" 0.083" 22 mm 2.0 mm
25 mm 2.2 mm

Pipe End NPT and ISO Pressure Ratings
Fitting that has both tube and pipe thread ends can have different pressure ratings. The pipe end pressure ratings chart given below for SS316 shows the pressure ratings for male and female pipe thread ends. Working pressure is calculated on ANSI code for pressure piping B31.3 basis.

TABLE 5 :
NPT/BSPT PIPE SIZE WORKING PRESSURE IN PSIG
MALE THREAD FEMALE THREAD
Straight Fittings Shape Fitting Straight Fittings Shape Fitting
1/8" 9100 9100 6400 5500
1/4" 7500 7500 6600 5600
3/8" 7200 7200 5300 5000
1/2" 6600 5800 5200 4500
3/4" 6400 6400 4300 3500
1" 6400 4600 4500 3900

SAE/MS Pressure Ratings for SS 316

TABLE 6 : Pressure ratings are from SAE J1926/3
SAE/MS THREAD SIZE Non Positionable Positionable
PSIG PSIG
5/16-24 4568 4568
7/16-20 4568 4568
1/2-20 4568 4568
9/16-18 4568 3626
3/4-16 4568 3626
7/8-14 3626 2900
11/16-12 3626 2900
13/16-12 3626 2320
15/16-12 3626 2320

CONSTRUCTION OF Fine-Lok® Tube Fittings
Fine-Lok® Tube Fittings consist of three precision component such as Nut, Single Ferrule and Body.

Fractional Fine-Lok® Tube Fittings
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Finger tight Fine-Lok ® Fractional Tube Fittings.
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Assembled Fine-Lok® Fractional Tube Fittings after tightening the Nut 1 ¼ turn from the finger tight position.

Metric Fine-Lok® Tube Fittings
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Finger tight Fine-Lok® Metric Tube Fittings.
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Assembled Fine-Lok® Metric Tube Fittings after tightening the Nut 1 ¼ turn from the finger tight position.


CONSTRUCTION OF Well-LokTM Tube Fittings
Well-LokTM Tube Fittings consist of four precision component such as Nut, Back Ferrule, Front Ferrule and Body.

Fractional Well-LokTM Tube Fittings
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Finger tight Well-LokTM Fractional Tube Fittings.
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Assembled Well-LokTM Fractional Tube Fittings after tightening the Nut 1 ¼ turn from the finger tight position.

Metric Well-LokTM Tube Fittings
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Finger tight Well-LokTM Metric Tube Fittings.
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Assembled Well-LokTM Metric Tube Fittings after tightening the Nut 1 ¼ turn from the finger tight position.
Gaugeability :
SEALEXCEL Fine-Lok® /Well-LokTM Tube Fittings are manufactured to very stringent tolerances to meet the Gaugeability to check the gap between Nut and Body Hex, this allows easy inspection for sufficient tightening of the Nut before a system is pressurized, which ensures maximum safety and reliability.

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