What means the “maximum allowable pressure PS”?
September 9, 2024
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Valve seat test – What are Standards for leakage acceptance?
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Duplex stainless steels – Classification in four groups
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Terms for hydrogen induced cracking processes of steels
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Frequently Answers and Questions about the PED
What means the “maximum allowable pressure PS”?
The Term “PS = maximum allowable pressure” is specified in PED. “PS” is the pressure at a specific point on the pressure equipment for which the pressure equipment as a whole was designed. The specified location is usually the highest
September 9, 2024
Suitable Standard-Duplex and Super-Duplex steels for Pressure Equipments
Compared with some other materials, Super Duplex Stainless Steel is a less costly material of construction offering high mechanical strength, good weldability, good toughness and good corrosion resistance even in highly demanding applications. These qualities have led to acceptance and
July 18, 2024
Stainless steel materials with high resistance to chloride-induced stress corrosion cracking (SCC)
Stress corrosion cracking (SCC) is characterized by cracks propagating either transgranularly or intergranularly (along grain boundaries). Chlorides are widely present in many industrial and natural environments, such as seawater. When metal alloys are exposed to these environments, they can become
August 30, 2024
Duplex stainless steels – Classification in four groups
Duplex stainless steels are generally assumed to consist of roughly equal parts ferrite and austenite (hence the term “Duplex”). Duplex stainless steels have evolved in recent decades and are now classified into 4 groups: – Lean Duplex stainless steel– Standard
July 16, 2024
Is Design Approval by a notified body required under Modul G?
Module G does require that a notified body must examine the design of the pressure equipment and it is considered reasonable to expect the notified body to inform the manufacturer of the results of the examination. Module G does not
June 9, 2024
Which documents have to be available for the final inspection of a Pressure Equipment?
Pressure equipment shall undergo a final inspection to assess visually and by examination of the accompanying documents compliance with the requirements of this Directive. Test carried out during manufacture may be taken into account. As far as is necessary on
June 8, 2024
Weldolet – Integral reinforced forged branch outlets
Weldolet fittings – the Branch Connection Fittings are also named as Outlet fittings. Outlets are a family of forged products used to make 90 degree or 45 degrees integrally reinforced branch connections from a header pipe or run pipe to an outlet pipe or
July 2, 2024
What means ISO 5208 leakage rate A?
The ISO 5208 rate A specify a leakage by internal tightness seat test (or often also called closure test) of valves. Usually one side (valve inlet) shall be subjected to the test pressure and amount of leak shall be measured
May 29, 2024
High temperature hydrogen attack (HTHA) of steels
Carbon steel process plant that operates with hydrogen at elevated pressure and temperature can be weakened by a phenomenon known as high temperature hydrogen attack (HTHA). The effect of hydrogen on carbon steel and its alloys has been known for some
May 29, 2024
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