Assemblies mean several pieces of pressure equipment assembled by a manufacturer to constitute an integrated and functional whole.
Classification of assembly
The category of each individual pressure equipment making up the assembly is based on the conditions which can occur in the assembly, taking into account:
– the volume or nominal size DN, as appropriate, of the item ;
– at least the conditions PS, TS, type or group of fluid, for which the assembly is designed, which can be lower than the intrinsic conditions of the item.
The highest category of each individual pressure equipment determined from these conditions will then determine the assessment of the integration of the items in the assembly.
Conformity assessment of assembly
| no. | Assemblies | Category | Essential Safety Requirements (ESR) | Conformity assessment Procedure |
|---|---|---|---|---|
| 1 | (a) assemblies1 intended for generating steam or superheated water at a temperature > 110 °C comprising at least one item of fired or otherwise heated pressure equipment presenting a risk of overheating; Examples: – fired steam an hot water boilers – superheaters and reheaters – waste-heat boilers – waste incineration boilers | highest category of pressure equipments | ESR (set out in Annex I) | see below |
| 2 | (b) assemblies other than those referred to in point (a), if the manufacturer intends them to be made available on the market and put into service as assemblies. Examples: – pressure cookers – breathing apparatus – portable fire extinguishers – pressure sterilisers – refrigeration plant – air conditioning units | highest category of pressure equipments | ESR (set out in Annex I) | see below |
| 3 | Assemblies intended for generating warm water at temperatures ≤ 110 °C which are manually fed with solid fuels and have a PS·V > 50 bar·L | use Annex II table 4 | ESR points 2.10, 2.11, 3.4, 5 (a) and 5 (d) of Annex I. | EU-type examination (Module B4 — design type) with respect to their conformity with the essential requirements referred to in points 2.10, 2.11, 3.4, 5(a) and 5(d) or Module H |
| 4 | Assemblies2 that do not reach the above mentioned limit values, i.e. which can only be classified as SEP in the classification tables, shall be designed and manufactured in accordance with the sound engineering practice of a Member State in order to ensure safe use. Pressure equipment and assemblies shall be accompanied by adequate instructions for use. | not applicable | No | SEP3 |
| 1 The assembly shall comprise, as a minimum, the boiler including all the pressure parts from the feedwater inlet (including the inlet valve) up to and including the steam and/or hot water outlet (including the outlet valve or, if there is no valve, the first circumferential weld or flange downstream of the outlet header). 2The assembly, which only includes SEP pressure equipments, is to be classified as an SEP assembly | – | – | 3 SEP = Sound Engineering Practice (see below) – 4 by use of module B, no identification mark of the notified body |
Conformity assessment procedures for assembly
Assemblies referred above shall be subject to a global conformity assessment procedure comprising the following assessments:
- the assessment of each item of pressure equipment (vessel, piping, pressure accessory or safety accessory) making up the assembly which has not been previously subjected to a conformity assessment procedure and to a separate CE marking; the assessment procedure shall be determined by the category of each item of equipment;
- Assessment of the putting together of the different individual parts of the assembly in relation (assessment of the integration) to
- the safety precautions during handling and operation (see Annex I no. 2.3 of the PED),t
- the reliability and suitability of the components used and fitted in a due and proper manner (see Annex I no. 2.8 of the PED)
- where appropriate, guaranteeing safe filling and emptying (see Annex I no. 2.9 of the PED;
- the assessment is to be carried out according to the highest category of the relevant pressure equipment, whereby safety accessories are not taken into consideration;
- Assessment of the protection of an assembly against exceeding the permissible operating limits as referred to in points 2.10 and 3.2.3 of Annex I of the PED; this to be carried out according to the highest category of the pressure equipment to be protected.
SEP (Sound Engineering Practice)
Assemblies that do not reach the above mentioned limit values, i.e. which can only be classified as SEP in the classification tables, shall be designed and manufactured in accordance with the sound engineering practice of a Member State in order to ensure safe use. Pressure equipment and assemblies shall be accompanied by adequate instructions for use.
These assemblies shall not bear the CE marking.
Read More
Classification Vessel: see flow chart and table 1 to 4
Classification piping and pressure accessory: see flow chart and table 6 to 9
Fluide group determining: see helpful listing and sources
