October 08, 2024
Torque vs. Load Study for Flared Tube Fittings
Tools and Design Standards
Weight Study Chart
Wyle Laboratories Test Report
Recommended Assembly Instructions
VOI-SHAN – SCOTT CONNECTOR SYSTEM Customer Drawings
Conical Seal into the Boss Design
VOI-SHAN reports on SCOTT CONNECTOR SYSTEM
Development of Flared Fittings for Helium Lines
SECO SEALS Historical Engineering Documents
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Torque vs. Load Study for Flared Tube Fittings

Historical SECO SEALS document – Post 9 is a17-page report on “Torque Vs. Load Study Flared Tube Fittings” which was presented at the Society of Automotive Engineers at their 26 April 1960, Spring Meeting in Miami, Florida. An extract from that study follows.

“… It was found that of 160 test samples assembled at standard maximum torques only four wee able to contain helium gas at 3,000psi and most failed below 500. When a material with a low yield point, in this case soft copper, was placed at the sealing interface, the same fittings contained pressures of 3,000 to 4,000 psi with only 9 exceptions – most of which were traced to gross tube defects… Our assumption now is that the minimum torque required to seal helium with a corrosion resistant steel flared assembly is that torque which will develop a stress of 30,000 psi at the sealing interface.”