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: -








 

Vessels

SteamGenerators

Piping





State of Contents
Gas

Liquid
 
Gas

Liquid





Fluid Group
1

2
1

2
1

2
1

2





Chart Number
1
2
3
4
5
6
7
8
9


Click on 'chart numbers' to view required chart.
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.

 Service
  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 users risk - if in doubt please ask our sales team
to verify classification(s).
 Email our Sales Department for further
 information by clicking here.

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