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Semi-Welded Plate

Schmidt® SIGMADUAL Semi-Welded Plate Heat Exchangers

API Heat Transfer SIGMADUAL semi-welded plate heat exchangers feature plates that are welded using advanced laser welding techniques. Two plates are welded together and can be fitted with a Viton® O-Ring and/or Teflon® gasket liner. The resulting plate pack has every other plate fully serviceable, while maintaining integrity of the welded plate pair. This is especially suitable for critical fluids and gases, such as ammonia or caustic process chemicals where fluid loss is not acceptable. In the case of ammonia refrigeration, the reduced volume results in significant savings.

Operating Parameters

 

Temperature:
Pressure:
Capacities:
Connections:

-40°F - 320°F (-29°C - 200°C)
Vacuum to 460 psig (35bar)
up to 3500 GPM (2000m³/h)
3" to 14"- Studded or Flanged

Technical Parameters

Plates

Standard:

AISI 304 (1.4301)
AISI 316L (1.4404)
AISI 316Ti (1.4571)

 

Exotics:

AISI 904
SMO 254
Nickel Alloy, Ti, and Ti-Pd Alloy

 

Thickness:

0.6 mm to 0.8 mm

 

 

 

Gaskets

Standard

Nitrile Rubber Gasket, EPDM Rubber, 
Chloroprene Rubber

 

Exotics:

HNBR, NBR-HT, FPM/FKM, Butyle, PTFE coated (SIGMACOAT),
Food Industry Certified Gaskets

Attachment Method

SIGMAFIX Adhesive-free Gasket, or Glued Gasket

Frame

Painted Carbon Steel

Connections

Standard:

Studded with optional 304/316 liner, 
flange, FPT

 

 Exotics:

 Ti, SMO, Hastelloy, and 904L

Codes and Standards

ASME, PED, ABS, LRS, GL, BV, GOST

*Teflon is a registered trademark of E. I. du Pont de Nemours and Company Semi-Welded Plate Pair with *Teflon Gasket