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Lokring Technology

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6 Deploys

The only cold weld technology

Page last modified
May 11 2023

Lokring Technology manufactures a patented, metal-to-metal, butt weld equivalent connection for small bore pipes. Lokring, which qualifies to ASME B31 Piping Codes, can be installed in just 15 minutes and requires no hot-work and as a consequence no purging/drying, no habitats, no fire watch, and no NDT.

With over 30 years of experience, Lokring is proven to vastly reduce costs and schedule for maintenance, modifications, brownfield, and greenfield scopes whilst improving site safety.


No hot work
Rapid installation
High integrity
Leak free (suitable for fully welded systems)
Safer operation
0.001% rework
Restricted to 4" and below
Restriction on materials (316/316L, 312 and 304. A106 Gr B, A333 Gr 6, ASTM A53 and API 5L. C70600)


Compliance ASME B31.1 and B31.3 Piping Codes. NACE MRO175 for Sour Service.
Certifications / lincenses Lloyds Type Approval | American Bureau of Shipping Type Approval | IACS Type Approval | British Ministry of Defense Approval | NAVSEA US Navy Approval.
Sizes Carbon Steel Pipes – ½” to 4” | Stainless Steel Pipes – ¼” to 3” | Copper Nickle Pipes – up to 2"
Pressure class Couplings, elbows and other shapes suitable for class 3000#. Flange ratings 150 to 1500#
Temperature Carbon Steel: -46 to 427ºC | Stainless Steel: -253 to 427ºC
Material A106 Gr B, ASTM A53, API 5L, A333 Gr 6. 304/304L, 316/316L. UNS C 70600

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Technology Readiness Level


Development Technology demonstration Mature / Proven
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About Lokring

LOKRING Technology is dedicated to the relentless pursuit of perfection in understanding and satisfying the industry’s fluid and gas connection requirements. Using state of the art technology, LOKRING designs and produces the most advanced fluid and gas transfer connectors on the market today. Manufactured in our world-class facility, LOKRING fittings are produced under quality systems certified to ISO 9001:2015. The patented LOKRING connector was derived from aerospace technology and is a superior quality, leak-free fitting that is extremely reliable, easy to install, and requires no heat for installation.

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