What if you could join a live line permanently, without a single spark? With LOKRING® coldweld pipe fittings, you can.
Installed in minutes with a hand tool, the patented connection replaces welding on small-bore piping in refineries, gas plants, offshore facilities and marine systems. As a result, there is no flame, no purge gas and no hot-work permit to manage. PT Saka Nusa Persada supplies and installs LOKRING® across Indonesia, so your team gets the product and the field support from one partner.
How LOKRING® Coldweld Pipe Fittings Work
Every joint relies on Elastic Strain Preload (ESP®). Initially, the driver ring moves forward and swages the fitting body onto the pipe. This creates a 360° circumferential, metal-to-metal seal. Because the seal stays under elastic preload for the life of the connection, the joint is permanent and tamper-proof. In other words, it performs as a weld equivalent without ever heating the pipe.
LOKRING® coldweld pipe fittings also come in carbon steel, low-temperature carbon steel, stainless steel, copper nickel and brass, from 1/4″ to 3″ NPS.
Key Advantages of Coldweld Pipe Fittings
- Zero hot work: crews need no flame, purge gas or fire permit, so they can work safely even in fire-hazardous areas.
- 10× faster than welding: each connection takes only minutes; therefore, shutdown windows shrink or disappear altogether.
- No X-ray, no NDT: instead of radiography, a simple visual inspection verifies every joint.
- Code-qualified: the fittings meet ASME B31.1, B31.3, B31.4, B31.5, B31.8 and B31.9, and they also pass the API 607 fire test.
- Built for harsh service: ratings reach 8,810 psi and cover −60°C to +425°C, whether onshore, offshore or subsea.
- Proven at scale: in fact, installers worldwide have made more than 2 billion LOKRING® connections over 40-plus years.
Technical Specifications
| Size range | 1/4″ to 3″ NPS |
| Design pressure | Up to 8,810 psi |
| Temperature range | −60°C to +425°C |
| Materials | Carbon steel, low-temperature carbon steel, stainless steel, copper nickel, brass |
| Qualifications | ASME B31.1 / B31.3 / B31.4 / B31.5 / B31.8 / B31.9, API 607 fire test |
| Inspection | Visual inspection; no radiography or NDT required |
Where Coldweld Pipe Fittings Make the Biggest Difference
- Refineries and gas processing plants
- Offshore platforms, especially where space is tight
- Instrument air and hydraulic lines
- Steam and condensate systems
- Utility and fire water lines
- Fire-hazardous areas that restrict hot work
Proven in the Field with PT Saka Nusa Persada
Our team has already put LOKRING® to work in demanding conditions. For example, at Pertamina EP we completed a carbon steel pipeline replacement in an extremely limited-access area with no welding and no hot work.
Beyond supply, we also deliver certified LOKRING® installation, from product selection and sizing to on-site support. Moreover, you can browse the manufacturer’s full range at LOKRING Technology. Working on refrigeration or HVAC lines instead? If so, explore our VULKAN LOKRING® braze-free tube connections.
Planning a tie-in, a small-bore replacement or a shutdown you would rather avoid? Request a technical assessment, and then we will size the right coldweld pipe fittings for your line.
