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: -40°F – 320°F (-29°C – 200°C)
Pressure: Vacuum to 460 psig (35 barg)
Capacities: up to 3,500 GPM (2,000 m³/h)
Connections: 3" to 14" — Studded or Flanged
Codes & Certifications
Basco™ heat exchangers are designed and manufactured to comply with a wide variety of international codes and standards, including:
- EU Pressure Equipment Directive (PED)
- Chinese Safety Quality License
- Australian Pressure Vessel Code AS1210
- Singapore Pressure Vessel Code
- DOSH Malaysian Pressure Vessel Code
- Canadian Registration Number (CRN)
- Indian Boiler Regulations (IBR)
- Polish UDT Code
- API 614, 660, 618
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, EPDM Rubber, Chloroprene Rubber
Exotics: HNBR, NBR-HT, FPM/FKM, Butyle, PTFE coated (SIGMACOAT), Food Industry Certified
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
Semi-welded plate pair shown with *Teflon gasket. *Teflon is a registered trademark of E. I. du Pont de Nemours and Company.
Performance Notes
- Welded plate pairs with serviceable plates between
- Suitable for critical fluids and gases (ammonia, caustics)
- Plate materials: AISI 304, 316L, 316Ti (standard); 904, SMO 254, Ti, Ti-Pd (exotic)
- Plate thickness: 0.6 mm to 0.8 mm
- Standards: ASME, PED, ABS, LRS, GL, BV, GOST