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ENGINEERING COMPANY LIMITED
To apply the Pressure Equipment Directive (P.E.D.) to specific filters and strainers, it is necessary to classify the equipment into one of five assessment categories (Items 1" and below do not apply):-
• Category IV (the most stringent)
• Category III
• Category II
• Category I
• Sound Engineering Practice (S.E.P.) - No involvement by Notified Body.
the above categories are derived from charts which are indicated in the following table:-
Information required to classify the equipment:-
• Type of Equipment
a) Vessels - defined as 'major increase in volume relative to pipeline' i.e. large Basket Strainer, Pressure Vessel, tank etc.
b) Piping - defined as 'minor or no increase in volume relative to pipeline' i.e. Y-Type Strainer, valves etc.
a) Fluid or b) Gas
• Fluid Group
a) Group 1 - classified as dangerous substances, i.e. explosive, extremely flammable, highly flammable, flammable, very toxic, toxic, oxidising.
b) Group 2 - comprising of all other fluids, including steam.
Once the relevant chart has been identified, the correct classification can then be identified by plotting the charts as follows: -
Vessels - Volume against Maximum Allowable Pressure.
Piping - Nominal size against Maximum Allowable Pressure.
The use of graphs on this site for classification purposes are at the users risk - if in doubt please ask our sales team to verify classification(s).
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Telephone: +44 (0)1527 831644.