Blanketing gases such as nitrogen and carbon dioxide are commonly used as protective atmospheres in storage tanks and vessels containing flammable liquids or solids to prevent fire or explosion. These gases are also used to maintain a dry inert atmosphere to prevent corrosion of industrial cleaned piping and vessels.
Whether you have a fired heater, or pipeline that has become dirty or new piping that needs cleaning, we offer a complete line of cleaning and drying services that can be tailored to each of your individual projects. An engineering analysis will determine which option will meet your cleaning and dew point specifications in the most cost-effective way possible.
One of our most frequently requested methods is the SANDJETTM service for internally cleaning both fired heaters and industrial piping. Using high-velocity, nitrogen-propelled, non-hazardous cleaning materials, the SANDJET service is often the fastest, most effective method available for cleaning.
Reactors operating at elevated temperatures must be cooled down prior to reactor entry when the catalyst has become fouled. Our once-through and Nicool® reactor cooling services offer efficient and unique ways to do just that.
A once-through cool down can be performed on any reactor. Cool gas is introduced into the reactor and flows through it to remove the heat from the catalyst, allowing it to be safely removed. If an appropriate recycle compressor is available, Nicool® Service uses liquid nitrogen, controlled by our proprietary system to cool the recirculating gas which then cools the catalyst. The use of this system can reduce nitrogen consumption to a third of what is needed without the recycle compressor."
NITROGEN PUMPING SERVICES FOR YOUR PIPELINE CONSTRUCTION AND MAINTENANCE NEEDS
Praxair nitrogen–assisted displacement provides a safe, fast and inexpensive means of removing product from a pipeline, whether for repair, product changeover or for product recovery when a pipeline is deactivated. In a single step, product is removed and the line is left with a dry and inert atmosphere. Whether the line contains natural gas liquids, crude oil, gasoline, diesel, liquid petroleum gas, ethylene or other liquid, our detailed analysis of the line profiles and project conditions allows for the most efficient displacement.
Full Service Drying is a complete problem-solving package for drying process systems. When drying a process system with nitrogen, the use of our Mobile Nitrogen Pumpers can provide nitrogen at high flow (up to 540,000 scf per hour per unit), high pressure (up to 6,000 psi) and high temperatures (up to 600°F, 315.6°C). These capabilities, combined with the -90°F (-67.8°C) dew point of nitrogen, promote efficient removal of moisture from process systems which translates into time and money savings.
Our Dry Air Service complements other refinery turnaround services and offers another alternative to drying process systems. This service can deliver 100% oil-free air at dew points as low as -90°F (-67.8°C) using multi-bed desiccant dryers. The flow rate of each unit is approximately 75,000 standard cubic feet an hour and multiple units are available to meet your needs. Each unit can deliver pressure up to 125 psig, which allows for moisture removal by entrainment. All equipment is mobilized, operated and maintained by our personnel, reducing or even eliminating the need for customer site personnel during the drying process."
PIPELINE LEAK DETECTION WITH HELIUM, NITROGEN PUMPING SERVICES
Damaged pipes not only leak product but profits and productivity. That’s why we provide a comprehensive suite of accurate and reliable technologies and services that are designed to fit the needs and budget of your business, and are backed by the best experience and reputation in the industry.
The Tracer Tight® leak detection technology is available for a wide range of applications, including aboveground storage tanks (ASTs), underground storage tanks (USTs) and buried piping. The Tracer Tight technology is one of the most accurate and sensitive leak detection and location technologies available. This technology is capable of satisfying most state regulatory requirements, and can be used as a compliance, consent decree, due diligence, or pinpointing tool. It even exceeds U.S. EPA requirements for precision tightness testing for USTs. Leaks as small as 1 gallon per day (0.05 gph) can be detected without interruption or excavation. This method is third-party evaluated and is listed by the U.S. EPA National Work Group on Leak Detection Evaluations (NWGLDE).
We’ve also developed the SeeperTrace® pipeline leak location service for long-distance pipelines. This commercially available technology quickly and cost-effectively locates leaks in buried pipelines that carry liquids, gases or multi-phase products. A leak as small as 2.5 gallons per day can be detected without service interruption or excavation.
And finally, our HeliTec® helium leak detection service quickly locates leaks in buried pipelines as well as plant piping and systems. The method uses a helium tracer in a gas, usually with nitrogen as a carrier gas, and a sensitive helium detector. The normal fluid is removed from the line, the line is pressurized with the test gas, and then the helium detector is used to sense the presence of helium in the air above the line.
We use nitrogen to safely purge potentially explosive hydrocarbon and air mixtures from vessels, gas lines, transfer lines and equipment.
Temporary Supply of Nitrogen, Oxygen, and Hydrogen
When your normal supply of industrial gases are unable to meet the flow, pressure or temperature of your temporary requirements, or your supply has been interrupted, Praxair Services can help satisfy your temporary supply needs. With a fleet of pumpers, vaporizers, transports and tube trailers nearly any combination of pressure temperature and flow rate can be supplied for hours, days or months.