Alfa Laval double-wall, double safety at Shanghai MDI plant
A large chemical plant in China, Shanghai BASF Polyurethane Co., Ltd. (SBPC), has installed an Alfa Laval double-wall plate heat exchanger for cooling MDI from the process plant before it is put into storage tanks.DATE 2017-07-13
The double-wall design of the plate heat exchanger provides double safety in case of damage to the heat transfer plates. According to Mr. Walter van Gysel, MDI Technology Manager, at SBPC, the double wall plate heat exchanger has performed beyond expectations.T
he Alfa Laval double-wall type plate heat exchanger provides double safety in case of damage to the heat transfer plates, resulting for instance, from corrosion caused by poor cooling water quality. The double plate system means that damage to one plate would only result in an external leakage which can be detected visually. The hot and cold fluids cannot intermix unless both plates are damaged at the same time.
- Risk of the fluids intermixing is eliminated
- Any leakage is external
- Two to three times higher heat transfer coefficients than in shell-and-tube heat exchangers
- Low weight and compact design gives lower installation costs
- Full access to the heat transfer area makes maintenance easy and reduces the number of man-hours required.
Challenge and solution
To find a heat exchanger for MDI cooling where there is no risk of intermixing between the cooling water and the product.
An Alfa Laval double-wall plate heat exchanger.