Pressure Equipment Directive 97/23/EC related to Machinery Directive 2006/42/EC underlines the regulations that includes pressure equipment and assemblies of pressure equipment with an allowable maximum pressure of more than 0.5 bar and where the equipment defined as piping, vessels, pressure accessories and safety accessories. There are number of exclusion that has to be kept in mind when deciding if the equipment under consideration falls into the category of Pressure Equipment Directive PED 97/23/EC, the information of which can be found in paragraph 10 in Annex A that corresponds to Clause 3.10 of the PED.
After deciding the scope of the relevant directive it is important to realize the equipment type and fluids that are present in the equipment. Equipment can be of
- Vessel type resembling a housing that contain fluid under pressure
- Or piping that covers those components which are intended to use for transport of fluids and are integrated through connection with each other into a pressure system
- Or it could be steam generator example of which is boiler.
The fluid can be in the form of liquid or gas constituting either Group 1 or Group 2.
- In case of any doubt the fluid should be treated as a gas with the conditions such as vapor pressure more than 0.5 bar at the maximum allowable temperature for equipment.
- Group 1 included all categories of flammable, explosive, oxidizing, or toxic fluids while Group 2 constitute the remaining types of fluids.
- The information about the vapor pressure of the fluid should be readily available from the supplier of the fluid to avoid any unfavorable situation.
The manufacturer and relevant personnel should have an idea about the product classification that has been given in the table of product classification shown below:
with the determination of the type of equipment and deciding whether the fluid belongs to Group 1 or 2, the table corresponds to the nine charts that are present in Annex B of the directive publication that make it easy to identify method of compliance with the PED
The chart that is shown below also shows the procedures that must be follow to achieve the compliance with Pressure Equipment Directive PED. The volume has plotted along the horizontal axis and pressure on the vertical axis. To use the chart, the point corresponding to the volume of the equipment under consideration and the maximum pressure to which it will be subject is located on the chart. This point will fall into one of the five regions as defined by the curves on the chart. The regions are named as SEP, I, II, III and IV and indicating the category of the equipment which in turn specify the procedure related to PED. In some cases for pipework where volume is hard to determine, the charts use instead a nominal size (DN). This is only loosely related to the pipe's physical diameter, and the DN figure should, therefore, be obtained from the manufacturer or supplier of the pipe.
The step by step guide provide an ease to comply with the Pressure Equipment Directive in an efficient and vivid manner.
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