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Well-Lok Twin Ferrule / Fine-Lok Single Ferrule Tube Fittings
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.
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,
Stainless steel 316 Tube fittings are heat code traceable back to the original mill heat from which it was made.
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.
» 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
Table 2: TUBING DATA TABLES FOR METRIC SIZE
TABLE 3 : FACTORS USED TO DETERMINE ALLOWABLE PRESSURE AT HIGHER TEMPERATURES.
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.
» 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
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 :
SAE/MS Pressure Ratings for SS 316
TABLE 6 : Pressure ratings are from SAE J1926/3
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
Metric Fine-Lok® Tube Fittings
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
Metric Well-LokTM Tube Fittings
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.