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Latest Articles

Orifice plate and orifice flanges
Hydrogen gasket compatibility for hydrogen applications
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Flange calculations methods
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Standard PN-Flange connection with external loads
ASME BPVC Sect. VIII: Welded Joint Locations Categories
Gasket selection for industrial piping EN 13480-3
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MAWP calculation procedure for pressure vessels
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ASME BPVC Sect. VIII Div. 1 – minimum, calculated and maximum test pressure

Category: Pressure Equipments - FAQs

PED
What is “Particular Material Appraisal” (PMA)?

The Particular Material Appraisal (PMA) procedure is one of 3 ways to approve a material for the specific requirements of the pressure equipment: (more…)

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PED Pressure Equipment Directive
What information in the EU-Declaration of Conformity is to be provided with regard to the harmonised standards applied?

The applied standards or other technical specifications (such as national technical standards and specifications) must be indicated in a precise, complete and clearly defined (more…)

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PED Classification vessels
PED classification: Vessels

Vessels are classified into categories with increasing hazard potential in accordance with PED Annex II (see tables 1, 2, 3 and 4 below). The category is determined according to the … more

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Why does the permissible membrane stress specified in the PED for ferritic steels according to EN 10028-3 and EN 10222-4 not apply?

Those fine grained steels are micro-alloyed steels for pressure purposes as, for example, those given in EN 10028-3 or in EN 10222-4. For these (more…)

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Classification of Piping
PED classification: Piping

Pipings are classified into categories according to increasing hazard potential in accordance with PED Annex II (see tables 6, 7, 8 and 9 below). The category is determined according to … more

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PED Pressure Equipment Directive
What are materials and what are components for pressure equipments?

Materials are in contrast to components when they are manufactured by qualified and certified material manufacturers who can provide the corresponding material certificates which (more…)

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Steam boiler
PED Classification: Assembly

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

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PED Guideline J-09
What are main-pressure bearing parts?

The main–pressure-bearing parts are the parts, Examples of these parts are shells, ends, main body flanges, tube sheets of exchangers, tube bundles. The materials for these (more…)

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PED table 5
PED classification: Fired or otherwise heated pressure equipment with the risk of overheating

Fired pressure vessel or otherwise heated pressure equipment with the risk of overheating are classified into categories with increasing hazard potential in accordance with PED Annex II. … more

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