Pillowplates | Dimple Jackets

The applicable pressure code will have a safety factor on the working pressure.

Knowing the working/design pressure, the following step is the test pressure that will be 1.3-1.5 times the design pressure. Than inflation pressure must be declared, to be on the safe side during testing of the pillowplate, the inflation pressure should be 30 to 50% above the test pressure. This is to prevent deforming of the pillowplates again when putting the test pressure on the plates. To safely inflate the pillowplate to the inflating pressure the burst pressure of the pillowplate should be 30% or more above the inflation pressure.

Example:

• Woring pressure 10 bar
• Design Pressure code 15 bar
• Test pressure 15 – 18 bar
• Inflation pressure 30 bar
• Burst pressure 50 – 60 bar

The working and test pressure should never come above the inflating pressure !!!! This will cause unpredicatable deformation of the pillowplate. Also burst of the plate is possible if inflated towards the burstpressure.

With this burst pressure, the heat exchanger application, the pillowplate thickness is chosen with a application corresponding laser welding pattern, 0.8 – 1.0 – 1.2 – 1.5 – 2.0 are the normal plate thicknesses.

The application gives a global indication for the pillowplate thickness [mm], or the plate thickness for the application:

• 0.6 Solar collectors
• 0.8 Milk tanks (BMC), Plate registers
• 1.0 – 2.0 All applications (Tanks, wine plates, Falling Film Chillers, Ice banks)
• 1.2 – 1.5 Steam / Thermal oil