HomeJacketed & Double Wall Piping Fabrication
Metal Pipe Fabrication for Double Wall and Jacketed Piping System.
LPR Global specializes in double wall and jacketed piping fabrication for power plants, petrochemicals, steel mills, and shipbuilding industries. Manufactured in ISO9001 & 14001 certified facilities in South Korea, our pipe fabrication capabilities ensure the highest safety and performance standards for fluid containment and temperature-controlled processes.
With expertise in high-pressure and high-temperature piping, our team provides custom fabrication services for industrial applications requiring leak prevention, thermal regulation, and process/space efficiency. We fabricate piping systems in carbon steel, stainless steel, duplex alloys, and other materials per ASME B31.3 and ASME B31.1 standards. Our double-wall piping fabrication capabilities include both flange-closing type and open-closing type piping.
Our facilities are equipped with over 50 certified welders on site with WPS (Welding Procedure Specification) approval from nine different classifications society. We have been Tier 1 supplier of jacketed pipe fabrication to global companies such as POSCO, GE, Hyundai and Daihatsu diesel across industrial applications such as shipbuilding, power plants and Steel mill.
Please contact us for more information, or submit your RFQ package to [email protected] to receive a project quote.
Double Wall | Jacketed | Double Containment Pipe Fabrication
Double-wall pipe fabrication involves the construction of pipes consisting of two concentric layers – an inner pipe that carries the process fluid, and an outer pipe designed to contain any potential leaks or failures from the inner layer. This fabrication process is vital in industries where safety, environmental protection, and temperature control of the medium is crucial. Double-wall piping is commonly used in oil and gas, chemical processing, petrochemical, and energy sectors, where high-pressure and high-temperature conditions demand reliable containment solutions.
A crucial benefit of double-wall pipe systems is leakage containment. In the event of a failure or rupture in the inner pipe, the outer layer acts as a fail-safe, preventing hazardous fluids from escaping into the environment and reducing the risk of contamination. This feature is especially important in industries dealing with flammable or toxic materials, where the consequences of leaks can be severe.
Jacketed Piping in Cryogenic Applications
Aside from containment, another advantage is the temperature control of medium. Especially in cryogenic applications, the outer pipe serves as an insulating barrier to external temperature changes, providing efficiency in fluid/gas transportation. Our double-wall pipes are often engineered in consideration of two different mediums being transported between inner and outer pipes. Our double-wall pipes are engineered with the two different mediums of the outer and inner pipes in mind.
For more information on piping skids for cryogenic pumps, compressors and turboexpanders, please visit our Process Piping Skids and Modular Packages Page.
There are two types of double-wall piping provided by LPR Global, open-closing and flange-closing. Flange-closing type of double-wall piping has flanges on the two ends of the pipe to be installed using bolts and gaskets while open-closing would require on-site welding. With more than 30 years of experience in pipe fabrication, we ensure our double-wall pipes to be perfectly aligned between inner and outer pipes no matter the complexity.
LPR Global’s pipe fabricators are experts in precision machining and pipe welding. Double-wall pipes are constructed using advanced welding techniques, ensuring strong, durable joints that maintain the integrity of both the inner and outer layers. 3D modeling and isometric design software are employed to ensure each system is tailored to the specific requirements of the installation.
Jacketed Piping Fabrication Project
Stainless Steel Jacketed Piping for DAIHATSU DIESEL
Carbon Steel Jacketed Piping for DAIHATSU DIESEL
Jacketed piping is used for fuel transportation in green ships that rely on LNG, ammonia, or methanol instead of conventional bunker fuel. Since these substances can be flammable or toxic in confined spaces, jacketed piping systems are employed to enhance safety and efficiency. These systems use both the inner and outer pipes to transport the fuel, helping to minimize space occupancy while ensuring the secure handling of potentially hazardous mediums
Water Cooling Beam for Steel Mill Fabrication Project
Water cooling beam is a crucial component for a furnace heating section of steel mill. It controls the temperature of slabs or equipment in continuous casting lines, rolling mills and reheating furnaces as a heat dissipation device, preventing overheating and deformation.
The main challenge in water cooling beam fabrication is the quality control of nozzles welds, especially when nozzles are made of sheet metal of .05-inch thickness. Each weld must maintain uniform quality as well as positional accuracy to ensure functionality under constant exposure to steam.
Our facility is equipped with automatic radial welding machines to achieve uniform welding quality across nozzles. The nozzles are also welded with twin welding wire for better weld leg.
Power Piping for Combined Cycle Power Plants & Boilers Fabrication Projects
Power piping for Combined Cycle Power Plants must be capable of withstanding high temperatures, high pressures, and high humidity, all of which can negatively impact the integrity of pipe welds. Our ASME B31.1 and B31.3 certified facilities with extensive in-house testing equipment’s ensure compliance with quality standards.
Titanium & Alloy Steel Pipe Fabrication
Aside from Stainless and Carbon Steel, LPR Global has extensive expertise in exotic metal piping fabrication.
Titanium Grade 2 Spray Nozzle Header in CGL for Steel Mill
Titanium is lightweight, strong, and highly resistant to corrosion, making it ideal for demanding applications in industries such as chemical processing and oil & gas.
While material costs are typically higher than common pipe materials, titanium’s longer service life and its corrosion resistance property make titanium a cost-effective solution for demanding and critical applications.
Finding the right titanium pipe fabricator is a challenge for pipe system engineering companies, as fabricators must be knowledgeable in preparation cutting and welding techniques specific to titanium pipes and ensure functionality.
Carbide tool is recommended for titanium pipe cutting. Any smeared surfaces caused by using the inappropriate cutting tools may affect welding quality.
In welding, fabricator must carefully consider the heat generation of welding, as high heated titanium reacts to oxygen which damages its corrosion resistance. inert gas shielding (argon) must be used in welding to ensure purity in welding joints.
A335 P91 Alloy Steel Steam Piping Fabrication
A335 P91 alloy steel pipes are commonly used in steam piping systems due to its excellent heat resistance. Having the expertise and experience in steam piping fabrication is crucial with A335 P91 Alloy steels due its susceptibility in cold-cracking, preheating is needed. Welder must understand the importance of temperature control through out the stages of Preheat and PWHT as well as interpass temperature, of which the range varies on each welding procedures.
Expertise and experience in steam piping fabrication are essential when working with A335 P91 alloy steels, as these materials are prone to cold cracking. Preheating is necessary to prevent this issue. Welders must understand the importance of temperature control throughout the preheating, post-weld heat treatment (PWHT), and interpass stages, as the required temperature ranges vary depending on the specific welding procedure.
Pipe Fabrication & Manufacturing Process
Our strenuous pipe fabrication process ensures that our products meet high quality standards. With more than 50 certified pipe fitters and welders at our facility, we can ensure timely delivery of demanding projects.
Jig Manufacturing:
- Upon receiving the material for custom fabrication projects involving large sized pipes, we fabricate and fit jigs that provide the necessary support and alignment for the pipe’s pre-fabrication stage. Jigs are important initial step especially for double-wall piping since proper alignment between inner and outer pipe post-weld is crucial. For thinner pipes, jigs greatly improve reliability for welding grooves by minimizing vibration.
Marking & Cutting
- We then utilize our CNC pipe cutting machinery, ensuring that each cut meets client’s tolerance level. This level of precision is crucial for maintaining the integrity of the subsequent processes.
Bending
- After cutting, pipes undergo bending operations using either CNC or NC benders. Each bend is carefully monitored and measured through dimensional inspections, ensuring that the radius and angle conform to specified tolerances. Our bending facility allows pipe bending up to pipe size of 100A.
Fit-Up
- Before welding, a fit-up is completed, and pipes are inspected to verify that all components align correctly. We utilize alignment tools and fixtures to ensure that the parts fit together without gaps or misalignments. This step is essential to ensure welding quality and prevent misalignment and distortion.
Welding (TIG, CO2)
- We utilize both TIG (Tungsten Inert Gas) and CO2 welding techniques, depending on the material and application requirements. Visual inspections are conducted to check for defects such as undercuts, porosity, and incomplete fusion, according to established industry standards. For precise welding requirements of large diameter pipes, our facility is equipped with automatic radial welding machines, capable of welding large-diameter pipes with outer diameters up to 114 inches
NDT(RT/MT)
- Non-Destructive Testing (NDT) is performed to ensure the integrity of the welds. Radiographic Testing (RT) uses X-rays to detect internal flaws, while Magnetic Particle Testing (MT) identifies surface defects. Both methods are critical for ensuring compliance with safety regulations and industry standards.
Hydro-Test
- Hydro-test is conducted to assess the pressure resistance of the pipes. Each pipe is filled with water (or soap water) and subjected to a specified pressure for a predetermined duration of time. This test confirms that there are no leaks and that the pipes can withstand operational pressures per design.
Pickling & Passivation
- To enhance corrosion resistance, the pipes undergo pickling, which removes oxides and scale, followed by passivation to form a protective oxide layer. These chemical treatments are crucial for ensuring the longevity and durability of the pipes in exposure to steam, corrosive chemicals and extreme temperatures.
Parkerizing & Rust Prevention
- Prior to painting, our pipes are surface treated with either Parkerizing or shot blasting, depending on the specification. These processes improve painting quality as well as rust preventions.