Session: CT-04-02 Assembly of Bolted Joints - 2

Paper Number: 106493

106493 - The Effect of Lubrication on Percent of Red Rust and Break-Out Torque of Ptfe Coated Fasteners 

Polytetrafluoroethylene (PTFE) coated fasteners have been commonly used in various industry applications for both its corrosion resistance and lubricity during bolt up. There is a wide array of different brands and various process methods to apply PTFE on fasteners, that offer similar performance. However, there is a resounding question regarding if lubrication is needed during bolt up of PTFE fasteners and if there are any benefits to corrosion resistance and break-out.

For this study, we used two applicators of Xylan 1424 and one applicator of Flurokote #1, all PTFE based coatings.  The samples were subjected to salt spray environment in accordance with ASTM B117 at 1,500 hours, 2,000 hours, 2,500 hours, and 4,000 hours. The studs were torque to exactly 50% of ASTM B7 yield strength, where half of the bolts were torqued without lubrication and the other half were lubricated with Jet-Lube 550 Extreme. At each of the time intervals, the percentage of red rust on the stud and two nuts were measured and the break-out torque was recorded.

Numerous observations were made as to the relationship between application of lubrication and without regarding both corrosion and break out torques. This paper will talk in depth as to the benefits of using lubrication on PTFE coated fasteners.

Presenting Author: Justinn General Lamons

Presenting Author Biography: Justinn General is a Product Design Engineer for Lamons, whose work is focused on products and applications that support the energy transition to low carbon energy sources. He has been in the oil and gas industry for 8+ years, and has a broad understanding of material science focusing on ferrous and non-ferrous metals, quality control & assurance, and critical subsea manufacturing, with 3+ years of leadership experience managing both the quality and engineering departments and was the local chapter chair for American Society of Materials (ASM). He holds a Masters of Science in Material Science and Bachelors of Science in Nuclear Engineer both from Texas A&M.

Authors:

Justinn General Lamons
Dale Norman Lamons
Tommie Bao Lamons