PED_info

Pressure Equipment Directive

PED 97/23/EC

What is the PED?

The pressure equipment directive (PED) is a new European Community Directive that deals with the manufacture and sale of pressure equipment that has a maximum allowable pressure greater than 0.5 bar, such as vessels, valves, piping, safety accessories (including relief valves, bursting discs etc.) and pressure accessories (including control & isolation valves, pressure indicators and switches). Flanges, nozzles, couplings and other elements attached to pressurized items are also included. The directive 97/23/EC, better known as PED, became obligatory throughout the European Union and EFTA from 29 May, 2002.

Why PED?

The Directive arises from the European Community's Programme for the elimination of technical barriers to trade and is formulated under the "New Approach? to Technical Harmonization and Standards. Its purpose is to harmonize national laws of Member States regarding the design, manufacture, testing and conformity assessment of pressure equipment and assemblies of pressure equipment. It therefore aims to ensure the free placing in the market and the ability to put the equipment into service within the European Union and the European Economic Area.

Harmonized and National Standards

Harmonized standards are EN-standards produced by European norm organizations such as CEN, CENLEC and ETIS. The standards are harmonized against the PED. These standards are used in order to fulfill essential safety requirements for PED. The standards are in detail specifying the requirements for the actual application of the equipment.

Introduction of harmonized standards remains optional. Manufacturers can chose to fulfill other technical solutions, which show accordance with "essential safety requirements".

The EN 13 445 ?Unfired pressure vessel? standard is a new European Pressure Vessel standard according to PED 97/23/EC, valid since May 29, 2002.

To export a pressure vessel within the community, the EN 13 445 shall be used for the design and for the fulfillment of the requirements for pressure equipment.

National standards such as the ?old? national pressure vessel standard and updated standards can still be used if the manufacturer proves that it fulfills all requirements according to PED 97/23/EC.

”New Approach”

A New Approach Directive (the PED is one) does not impose any technical solution, thereby allowing industries to develop new techniques. The ≈Guide to the Implementation of Directives based on the New Approach and Global Approach? (AKA the Blue Guide) explains the concept and common aspects of the New Approach.

The definition of PED

The term pressure equipment includes vessels, piping, safety accessories and pressure accessories. Where applicable, pressure equipment includes elements attached to pressurized parts, such as flanges, nozzles, couplings, supports, lifting lugs etc.

Vessels are defined as a housing designed and built to contain fluids under pressure.

Piping means piping components intended for the transport of fluids, when connected together for integration into a pressure system.

Safety accessories means devices designed to protect pressure equipment against the allowable limits being exceeded.

Pressure accessories means devices with an operational function and having pressure bearing housings.

Assemblies means several pieces of pressure equipment assembled by a manufacturer to constitute an integrated and functional whole.

Product Classification

In order to determine how the Directive will apply to specific items of pressure equipment a manufacturer needs to classify the equipment into one of four conformity assessment categories: Categories I to IV. Category I relates to the lowest, Category IV to the highest hazard category.

Equipment below Category I come under "Sound Engineering Practice" (SEP) and is not subject to conformity assessment.

In order to determine which category an item of equipment falls under, the manufacturer needs to identify:

? the type of equipment - vessel / steam generators / piping

? the state of the intended fluid contents - gaseous or liquid

? the fluid group of the intended contents - Group 1 or Group 2

Group 1 comprises those fluids classified according to the EC Directive on the classification of dangerous substances as:

? Explosive

? Extremely flammable

? Highly flammable

? Flammable (where the maximum allowable temperature is above flashpoint)

? Very toxic

? Toxic

? Oxidizing

Group 2 comprises all other fluids including water/steam. Non-flammable and non-toxic fluids for instance (NovAseptic products are classified in fluid group 2)

Categories: To determine which applicable category (SEP, I, II, III or IV) the equipment belongs to, the equipment is divided into one of these categories depending on:

? Type of equipment

? Hazard of the fluid that has been used (fluid in group 1 or 2)

? Liquid or gas form of the fluid (cooling media is always to be considered as a gas)

x DN) or Pressure x Volume (P s x Volume)

? Product of Pressure x Dimension (P

s

Safety accessories: These are generally classified under category IV. Safety accessories manufactured for specific equipment may be classified under the same category as the equipment they protect.

Generally higher category results in higher requirements

PED Requirements: S E P * I I I I I I I V

Material documentation acc. EN 10204 type 2.2 X

Material documentation acc. EN 10204 type 3.1B

(full tracebility) and PED approval by material manufacturer

X X

X

CE-marking with reference number from Notified

body on final tested products X X

Quality system certified by Notified body X

X

Joint compound (e.g. welding and soldering) method

and personnel certified by Notified body X X X

Fulfill material requirements (X)1)

(X)1) (X)1) X X

Calculation and specification of equipment according

to PED approved by Notified body (X)1) (X)1) (X)1) X X

* SEP Sound Engineering Practice or in Swedish God teknisk praxis AFS 1999:4 §8

** Notified body is an inspection/test-organization authorized by the authority and accepted by all

European Union member states.

1) Manufacturer’s responsibility, Approval by Notified Body not applicable

Categorization of NovAseptic products

S E P I I I I I I I V

Tank Outlet Valve

Process Valve

NA-connect

Septum In-line holder

Tank Plate

(NA-mixer ?)

CE Marking

The CE-mark ensures that the component is designed and manufactured according to the PED requirements. NovAseptic products are designed and manufactured according to the PED requirements, but are not allowed to use the CE mark. The Process valves and Septum In-line holders are products not placed in the risk category, for which CE marking is required. NovAseptic products are placed under the category, SEP (Sound Engineering Practice) under PED Article 3 paragraph 3 or in Swedish ≈god teknisk praxis ? AFS 1999:4 §8 The Tank Outlet Valve , Tank Plate and the NA-connect are components that are placed in category IV, module H1. These products cannot be CE marked as single components, since a pressure test is required on these products. The pressure test is performed on the complete vessel-assembly, where the component has been integrated by welding. Therefore, it is the responsibility of the vessel manufacturer to CE mark the assembly and to pressure test it.

Process Valves below DN150 approved for a pressure of 6 bar will fall under this restriction Article 3 paragraph 3 in PED (§ 8 AFS) regulations and, therefore, are not allowed to use the CE mark.

The Tank Outlet Valve (body) is approved for a pressure of 10 bar. The valve can be installed to a vessel no matter what tank volume. Therefore, the Tank Outlet Valve must be placed under category IV to fulfill worst case (large volume and high pressure). 6 bar

DN 150

97/23/EC

Annex II

Table 7 10 bar 97/23/EC

Annex II

Table 2

Conclusion

The Directive makes clear that all companies selling pressure equipment must fulfill the requirements of the PED. NovAseptic?s products are designed for being placed in a pressure vessel or piping system, which means that NovAseptic has to fulfill the PED.

NovAseptic AB has been in cooperation with DNV as its Array Notified Body. DNV is an organization with high standards and

requirements, but also known for their high demands on quality,

safety and reliability.

NovAseptic has a Quality system for PED 97/23/EC certified by

DNV.

NovAseptic products can be placed in different applications and,

therefore, NovAseptic has chosen to have the most extensive

group called H1 for the products Tank Outlet Valve, Tank Plate

and the NA-connect.

NOTE!

/General information regarding the Directive

and its related standards may be found on the

following web pages:

https://www.360docs.net/doc/8c5319501.html, Official website for PED

https://www.360docs.net/doc/8c5319501.html, Official website for standardization

相关主题
相关文档
最新文档