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Pressure Equipment Manufacturer and Supplier Directory

PED Category Calculator

Pressure vessel

Select the appropriate calculator depending on the relevant fluid
Fluid Group 1
Fluid Group 2
Fluid Group 1
Fluid Group 2

PED Category Calculator for other pressure equipments:  
Industrial Piping  and Fired Steam Boilers

PED Category Calculator

Pressure Equipment Directive (PED) 2014/68/EU

Table 3

Type of Pressure Equipment:
Fluid Group:
Pressure Vessel
1 (Hazardous Fluids)
Liquids: Liquids having a vapour pressure at the maximum allowable temperature of not more than 0,5 bar above normal atmospheric pressure (1 013 mbar);
Max. allowable Pressure

Exceptionally, assemblies intended for generating warm water, shall be subject either to an EU-type examination (Module B — design type) with respect to their conformity with the essential requirements referred to in points 2.10, 2.11, 3.4, 5(a) and 5(d) of Annex I, or to full quality assurance (Module H).



The PED Category online calculator for pressure vessels is a useful tool to calculate the category. Once the category is determined, the conformity assessment module can be selected.

PED Table 3

Note 1: Heat exchangers are considered to be vessels, exception: 
Heat exchangers which consist of straight or bent pipes which may be connected by common circular header(s) made also from pipe are classified, and only if, the three following conditions are met:
– air is the secondary fluid,
– they are used in refrigeration systems, in air conditioning systems or
– in heat pumps,
– the piping aspects are predominant.

Note 2: Half-pipe coil or a similar “jacket” construction that heat or cool a vessel are to be classified as vessels.

Note 3: At gas-loaded accumulators, or other vessels with a flexible or non fixed membrane, are made up of two chambers with different fluids, the maximum allowable pressure (PS) and the total volume of the vessel shall be used for classification.

Note 4: If a vessel contains a gas and  liquid, the classification shall be on the basis of the fluid which requires the higher category. The total volume (V) of the vessel, shall be used to determine the category, not the actual volume occupied by the individual fluids at any particular time.

Note 5: If a pressure equipment has several pressure chambers, the categories for the individual chambers must be determined separately. The pressure chamber with the highest category is then decisive for the pressure equipment, e.g. heat exchangers

Note 6: Characteristics (hazardousness) of the solid (contain in gas fluid) should be considered as part of the hazard analysis and do not influence the classification of the vessel.

Note 7: This PED Category Calculator can also use for Pressure Accessories (valve, filters,…). Where both the volume and the nominal size are considered appropriate, the pressure accessory shall be classified in the highest category.


Manufacturers & Suppliers
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  • Products limits dia., length & weight
  • Main used mat'l groups ISO/TR 15608
  • Directory is supported by professional Engineers
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Simple registration in 3 steps:

  1. Registration only with name, e-mail, company name,
  2. Approval and sending login data by PED directory team
  3. The vendor sends the prepared form with the details for the vendor directory listing