Products

LP spa offers a wide custom-designed range of products for the oil, gas and chemical industry by using most advanced technology, exceptional craftsmanship and an uncompromising dedication to excellence.

High frequency welded finned pipes


Studded pipes


Cryogenic liquid vaporizers


Heaters and boilers fabrication


Cold collectors and transferlines


Inlet distributors and pigtails

High frequency welded finned pipes



Manufacturing process

LP spa Steel Fin Tubes are helically wound and continuous welded to the tube by high frequency electric resistance welding of solid or serrated steel fins. This produces an homogeneous , clean and continuous fin – to – tube bond with no additional weld material, for a very efficient heat flow and resistance to corrosion.

This manufacturing process is carried out under strict standards. We also produce finned tubes with intermediate plain portions where required.

The use of high-frequency current results in very localised heating of the tube surface and the edge of the fin. This skin effect produces higher weld speeds, hence post-weld heat treatment is not considered necessary because of the superficial nature of the changes in the microstructure.


USES OF WELDED FINNED TUBES

The main uses for high frequency welded finned tubes are in the heat recovery associated with boilers for power generation and in furnace applications for the petrochemical industry.

SIZES AND MATERIALS

Our high frequency welding finning machines are capable of handling tube diameters from 33 mm o/d to 273 mm o/d and tube lengths of up to 26 meters. Fin sizes range from 6 mm to 38 mm high and from 0.8 mm to 3 mm thick.

Any combination of the following materials may be used for fin and tube: carbon, alloy, stainless steels and high nickel alloys.

Studded pipes



Welding process

The steel studs are automatically resistance welded to the tube, producing high quality forge welds. Our automatic studding machines are capable of handling tube diameters from 60mm o/d to 219mm o/d and standard stud diameter of 12.7mm.

The welding process enables the combination of any grades for studs and tube: carbon, alloy, stainless steels and high nickel alloys. Alloy steel pipes are stress-relieved after studding, according to the relevant specifications for the class and grade of steel used.

Corrosion protection

If required, the external surfaces of studded tubes can be treated with a protective coating.
Our engineers are always ready to assist you with design considerations to meet your specific product needs.


USES OF STUDDED TUBES

Steel studded tubes are used instead of finned tubes for heat transfer in the petrochemical industry, generally in furnaces and boilers where the surface is exposed to a very corrosive environment and where very dirty gas streams require frequent or aggressive cleaning.


Cryogenic liquid vaporizers



Welding process

Vaporizers are heat exchangers used for regasifying liquefied gases which are stored as a liquid under cryogenic temperatures.
LP spa, with its inhouse bending machines, possess several years of experience in the supply, fabrication and assembly of submerged tube bundles.

The bending technology adopted by LP spa. is also ideal for the fabrication of inlet and outlet hairpins with different bending radius and several combinations of pipe diameters and thicknesses.



Heaters and boilers fabrication



LP spa has a wide experience in the manufacture of:

• Headers and Manifolds
• Fired Heater Radiant and Convection Coils
• Fired Heater Modules
• Waste Heat Boilers, Preheaters, Economizers and Superheaters
• Piping Systems
• Skid assemblies

Our services cover also:

• Supply of structural steel
• Sandblasting and painting
• Refractory lining
• Refractory thermal dry-out
• Modularization
• Trial assembly
• Corrosion protection works


In addition to manufacturing extended surface tubing, LP spa can incorporate it into heat recovery systems and supply it as complete unit. If required, we can also include the supply of the steel structure, refractory lining, accessories and assembly.

LP spa has always been concerned about Quality Assurance and has a very well equipped Materials Inspection Department to assure a constant follow up during all fabrication stages. Its high technological level in manufacturing gives LP spa a prominent position in its field of activity having also obtained qualifications within several national and international official institutions. During its 40 years of activity our company has succesfully carried out large supplies to all major internation engineering companies. LP spa products are used in refineries, petrochemical and power generating plants all over the world.

Cold collectors and transferlines



In the cold collector system, the reformed gas is introduced directly from the individual tubes to the transfer line which is located outside the furnace. In this system, special devices are required for connecting the hot parts to the cold collectors. Different versions of this concept are used by Linde Engineering, Haldor Topsoe, Lurgi, Uhde and other engineering companies. LP spa during several years of activity has successfully supplied and fabricated cold collectors based on all design concepts. Modern fabrication technologies joined with gained experience and knowledge have led cold collectors to be LP spa flagship product. Recently, investments have been made in our workshop in order to allow the most efficient fabrication process which leads to the highest quality of refractory lined cold collectors.


Inlet distributors and pigtails



LP spa, has all the technology and experience in the supply, fabrication and assembly of inlet/outlet hairpins and distributor. The bending machinery adopted by LP spa is capable of different bending radiuses and several combinations of tube diameters and thicknesses. Moreover, a new welding robot has been introduced in order to guarantee the maximum quality during welding activity.

Outlet pigtails are fabricated from pipe 1-1/2” under the rules of ASME B31.3. Outlet pigtails are made from ASTM B 407 alloy 800H (30% Ni, 20% Cr). These alloys combine corrosion resistance with strength and metallurgical stability. Alloys 800H and 800HT are the standard materials for intermediate working temperatures (620 to 925 °C).

Inlet Pigtails are fabricated from pipe 1“ under the rules of ASME B31.3. Inlet pigtails are made from ASTM A312 Grade TP304H austenitic stainless steel. The Inlet pigtails operate at relatively lower temperature than outlet pigtails. Design temperature is 440°C.


© LP spa All rights reserved
Via Campo dei Fiori, 28 21040 Venegono Superiore – +39-0331-827911 | Fax: +39-0331-827722 – lp@lpspa.it
Company registered in VARESE  P.IVA/VAT Nr. 00531940120 – Company’s capital 560.920,64 €

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