Special Items

Internal polishing

• Internally polished pipes and fittings in stainless steel.
• The products are widely used for pharmacy, chemical industry, food industry, oil and special industry.
• Accuracy of work finish can reach Ra 0,1 – 0,05µm.
• The polishing can be done on tubes and fittings with outside diameter of 14mm till 2500mm (96”).
• Also internally mirror polished pipes and fittings.
• All roughnesses, rugosities are checked with Mitutoyo

Checking the rugosity with Mitutoyo

Internally polished welded elbow of 24” SCH40S in 304L. The internal rugosity is maximum 0,3mµ

Internally polished seamless pipe of 16’’ x 28,5mm min. wall. The internal rugosity is maximum 1,0mµ

Opened packing of an internally polished T-piece of 32” SCH10. The internal rugosity is maximum 0,3mµ

Packed internally polished fittings ready for shipment. The internal rugosity is maximum 0,3mµ

Finned heat exchanger bundle

Integrally finned tubes by low finning

Integral low fin tube for use in situations where extended surface is required, but lack of space or heat exchanger type dictates otherwise.
Available materials are stainless steel (304L, 316L, 321(H), 304H, 310, …), duplex, copper alloys, nickel alloys, hastelloy and titanium.
Integral Low Fin Tube has the advantage that it can improve the thermal performance of a heat exchanger without the necessity for changing shell size, flow arrangement or the repositioning of piping.
The external surface of the tube is increased by the formation of ”low fins” by direct extrusion from the material of the base tube.

Size range / Dimensions

• Tube size: 12,7mm, 15,88mm, 19,05mm and 25,4mm
• Fins per inch: 16, 19, 26, 28, 30, 32, 36, 40 and 43 fins/inch dependant on material

Quality test capabilities

• Non-destructive eddy current examination
• Air under water testing
• Hydrostatic testing (with fluorescent dye)
• Fin profile examination at 50x magnification
• Dimensional & ring gage checks

Applications

• Refrigeration, air conditioning, condenser, heat exchanger, boiler

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