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ASME STP/PT-002
New product
ASME STP/PT-002 2005 Edition, May 27, 2005 ASME SECTION I PED GUIDE Supplement to Guide for ASME Stamp Holders Use of ASME Section I to Meet the EC Pressure Equipment Directive {97/23/EC)
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Description / Abstract:
The Directive [1] applies to all equipment (pressure vessels,
piping, boilers) subject to a pressure greater than 0.5 bar.
Despite several exclusions, such as equipment in the nuclear power field, this scope is very wide as it covers usual products (such as pressure cookers) as well as large industrial equipment (such as chemical reactors or liquefied gas vessels).
The Directive applies only to new equipment.
It should be recognized that major replacements to boiler plants such as steam drums or reheater headers can be covered by the Directive even if they are replaced on a "like for like" basis.
Guideline 3/4 outlines the extent of a "boiler" stating that it covers from the feedwater inlet (including the inlet valve) to the steam outlet (again including the outlet valve). It includes all interconnecting pipework that may be exposed to a risk of overheating and are not capable of isolation from the main system. It also includes the associated safety accessories and the piping connected to the boiler involved in services such as draining, venting, desuperheating, etc. Readers will note that this scope of coverage is very similar to that of ASME Section I, Power Boilers [3].
Guideline 113 defmes the application to repairs or modifications of pressure equipment. The complete replacement of pressure equipment by a new one is covered by the PED. Repairs are not covered but pressure equipment that has been subjected to important modifications that change the original characteristics, purpose and or type after it has been put into service has to be considered as a new product covered by the Directive. This has to be assessed on a case-by-case basis.
During the transition phase of the PED up to full implementation in May 2002 there were numerous discussions and meetings on the subject of "assemblies." Various guidelines were developed by the European Commission in an attempt to clarify the issue.
Chapter X, Section 1 of the ASME Section VIII PED Guide [2] outlines the definition in the PED but the specific Guidelines such as 3/2, 3/8, 3/9, and 3/10 give further clarification.
Guideline 3/2 defmes the application to covering the joining of components at site and states that two cases have to be considered. The joining of component parts to make up an item of pressure equipment is subject to the requirements of the Directive.
Joining (welding) is not covered by the PED if it is carried out to constitute an installation under the responsibility of the user. In this case it is covered by national rules. It should be noted that when a user is putting items of pressure equipment or assemblies together, then the term "installation" is used to avoid confusion.
Guideline 3/8 states that items of pressure equipment form an assembly if:
(a) they are integrated, i.e., they are connected and designed to be compatible with each other.
(b) they are functional, i.e., they achieve specific, overall objectives and can be put into service
(c) they form a whole, i.e., all items are necessary for the assembly to function and be safe.
The guideline also states that it is irrelevant whether the completion of the assembly takes place at the manufacturer's workshop or by the manufacturer on site.
Clearly boilers fall into this defmition of an assembly and in fact shell boilers and water tube boilers are listed on the guideline as examples of assemblies.
Guideline 3/9 states that the PED does not limit the extent of an assembly and therefore a utility boiler could be considered as one assembly. However, an assembly can itself be composed of other assemblies and further items of pressure equipment. This is likely to be the case on utility boilers where the pressure parts usually come for different manufacturers and suppliers.
When a manufacturer places on the market a product as a final assembly, consisting of assemblies and items of pressure equipment, intended to be put into service as such, he has to perform the global conformity assessment resulting in CE marking of the fmal assembly. If some of the constituent assemblies are not CE marked then the individual items of pressure equipment should be included in the global conformity assessment.
Guideline 3/10 advises that it is possible to put assemblies on the market that are not CE marked if it is the intention that the assembly is not put into service as such but will become part of a larger assembly.
Despite several exclusions, such as equipment in the nuclear power field, this scope is very wide as it covers usual products (such as pressure cookers) as well as large industrial equipment (such as chemical reactors or liquefied gas vessels).
The Directive applies only to new equipment.
It should be recognized that major replacements to boiler plants such as steam drums or reheater headers can be covered by the Directive even if they are replaced on a "like for like" basis.
Guideline 3/4 outlines the extent of a "boiler" stating that it covers from the feedwater inlet (including the inlet valve) to the steam outlet (again including the outlet valve). It includes all interconnecting pipework that may be exposed to a risk of overheating and are not capable of isolation from the main system. It also includes the associated safety accessories and the piping connected to the boiler involved in services such as draining, venting, desuperheating, etc. Readers will note that this scope of coverage is very similar to that of ASME Section I, Power Boilers [3].
Guideline 113 defmes the application to repairs or modifications of pressure equipment. The complete replacement of pressure equipment by a new one is covered by the PED. Repairs are not covered but pressure equipment that has been subjected to important modifications that change the original characteristics, purpose and or type after it has been put into service has to be considered as a new product covered by the Directive. This has to be assessed on a case-by-case basis.
During the transition phase of the PED up to full implementation in May 2002 there were numerous discussions and meetings on the subject of "assemblies." Various guidelines were developed by the European Commission in an attempt to clarify the issue.
Chapter X, Section 1 of the ASME Section VIII PED Guide [2] outlines the definition in the PED but the specific Guidelines such as 3/2, 3/8, 3/9, and 3/10 give further clarification.
Guideline 3/2 defmes the application to covering the joining of components at site and states that two cases have to be considered. The joining of component parts to make up an item of pressure equipment is subject to the requirements of the Directive.
Joining (welding) is not covered by the PED if it is carried out to constitute an installation under the responsibility of the user. In this case it is covered by national rules. It should be noted that when a user is putting items of pressure equipment or assemblies together, then the term "installation" is used to avoid confusion.
Guideline 3/8 states that items of pressure equipment form an assembly if:
(a) they are integrated, i.e., they are connected and designed to be compatible with each other.
(b) they are functional, i.e., they achieve specific, overall objectives and can be put into service
(c) they form a whole, i.e., all items are necessary for the assembly to function and be safe.
The guideline also states that it is irrelevant whether the completion of the assembly takes place at the manufacturer's workshop or by the manufacturer on site.
Clearly boilers fall into this defmition of an assembly and in fact shell boilers and water tube boilers are listed on the guideline as examples of assemblies.
Guideline 3/9 states that the PED does not limit the extent of an assembly and therefore a utility boiler could be considered as one assembly. However, an assembly can itself be composed of other assemblies and further items of pressure equipment. This is likely to be the case on utility boilers where the pressure parts usually come for different manufacturers and suppliers.
When a manufacturer places on the market a product as a final assembly, consisting of assemblies and items of pressure equipment, intended to be put into service as such, he has to perform the global conformity assessment resulting in CE marking of the fmal assembly. If some of the constituent assemblies are not CE marked then the individual items of pressure equipment should be included in the global conformity assessment.
Guideline 3/10 advises that it is possible to put assemblies on the market that are not CE marked if it is the intention that the assembly is not put into service as such but will become part of a larger assembly.