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.
*Teflon is a registered trademark of E. I. du Pont de Nemours and Company Semi-Welded Plate Pair with *Teflon Gasket
| Temperature | -40°F - 320°F (-29°C - 200°C) |
| Pressure | Vacuum to 460 psig (35bar) |
| Capacities | up to 3500 GPM (2000m³/h) |
| Connections | 3" to 14"- Studded or Flanged |
| 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 |