SEALEXCEL® Fine-Lok™/Well-Lok™ 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 9001-2000 quality management systems to provide zero leak, Torque free seal in instrumentation and process tubing.
SEALEXCEL® Fine-Lok™/Well-Lok™ 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-Lok™ 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-Lok™ Tube fittings 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 Selection
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-Lok™ Tube fittings
The tubing should be compatible with the process fluid, pressure and temperature.
For good performance of Fine-Lok™/Well-Lok™ 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) | ||||||||
| 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 (PSI) | |||||||||||||
| Tubing O.D | WALL THICKNESS IN INCH | ||||||||||||
| .5 | .6 | .7 | .8 | 1.0 | 1.2 | 1.5 | 1.6 | 1.8 | 2.0 | 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 | 497 | ||||||
| 14 | 195 | 237 | 302 | 324 | 369 | 416 | 463 | 535 | 654 | ||||
| 16 | 169 | 205 | 361 | 280 | 319 | 358 | 398 | 460 | 564 | ||||
| 18 | 150 | 181 | 230 | 246 | 280 | 314 | 349 | 403 | 496 | ||||
| 22 | 121 | 147 | 185 | 199 | 225 | 252 | 280 | 322 | 394 | ||||
| 25 | 108 | 128 | 162 | 173 | 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.
| °F | °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 (316ºC) 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 (INCHES)
| TUBE OD | Nominal Minimum Wall Thickness |
| (INCHES) | (INCHES) |
| 1/8” | 0.028” |
| 3/16” | 0.028” |
| 1/4” | 0.028” |
| 5/16” | 0.035” |
| 3/8” | 0.035” |
| 1/2” | 0.049” |
| 5/8” | 0.065” |
| 3/4” | 0.065” |
| 7/8” | 0.083” |
| 1” | 0.083” |
Table 4 : GAS APPLICATION TUBING (METRIC)
| TUBE OD | Nominal Minimum Wall Thickness |
| (METRIC) | (METRIC) |
| 3 mm | 0.8 mm |
| 6 mm | 0.8 mm |
| 8 mm | 1.0 mm |
| 10 mm | 1.0 mm |
| 12 mm | 1.0 mm |
| 14 mm | 1.2 mm |
| 16 mm | 1.5 mm |
| 18 mm | 1.5 mm |
| 20 mm | 1.8 mm |
| 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 Fittings | Straight Fittings | Shape Fittings | |
| 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” | 4600 | 4600 | 4500 | 3900 |
Table 5 : 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 |
| 1-1/16-12 | 3626 | 2900 |
| 1-3/16-12 | 2900 | 2320 |
| 1-5/16-12 | 2900 | 2320 |