
Hydrostatic
Testing/isolation plugs
- Test open end pipes, pipelines, tubes and pressure vessels
- Perform flange-to-pipe weld testing
- Isolate and test pipe connections
PSI crews utilize the latest hydrostatic testing and isolation plugs to thoroughly pressure test your pipes, pipelines and pressure vessels. PSI test plugs are a safe, effective way to isolate and test pipe connections. Isolation plugs are designed to quickly isolate and hydrostatically test weld joints of any welded flange-to-pipe connection as well as isolating pipe ends during cutting, grinding and welding operations.
With PSI, your piping will be reassembled and back online quickly and safely—and you’ll have peace of mind knowing it’s been done right.

Portable Field Machining
In this industry we all know that time is money, and you’ll save both with PSI’s off-the-truck portable field machining services. Our field team can reface flanges, manways and nozzles on coded vessels and piping thanks to their years of experiencing in machining, pipe cutting and beveling.
PSI carries an extensive equipment inventory and also uses machines from Tri-Tool, Hydratight, Climax, Meridian, Wachs and other leading manufacturers.
PSI is the number one choice in field production machining of high-volume, small-size units including alkylation units. Ask us about our work on flanges and vessel manways up to 96” and larger.
Specialty Applications
Counterboring, J bevels, stainless pipe, low-profile and heavy-walled pipe applications aren’t a problem for PSI. We have all the equipment needed to get the project done, and a team that looks forward to the challenge.
Milling Pump Bases
Wherever equipment repair applications involve milling critical mounting surfaces, such as pump bases or pass plates, PSI has trained personnel and precision machines to do the job. We utilize portable, versatile, three-axis milling machining equipment, and with bed sizes of 20, 49 or 78”, we have the right machine to fit your application.
Pipe Cutting/Boring
Whether in our shop or in the field, PSI has the cold cut/bevel machines you need for piping fabrication. We’ll also help you safely remove sections of old piping without the hassles of hot work permits because no heat or flame is generated with our state-of-the-art equipment.
On-Site Maintenance Services
Plant Services, Inc. is ready to be your plant’s go-to maintenance service provider. We have the knowledge, staff and expertise you want in your maintenance partner. No matter the size or scale of the work, PSI is ready to meet your company’s needs.