Ferrite content in stainless steel and embrittlement

Summary the important notes on this concept: SS will be 885*F (475*C) embrittlement and, or sigma-phase promotion by Ferrite content. The ferrite contained in Austenite SS is kept around 2-5% for weldability. The Embrittlement by Sigma phase is prevented by keep FN < 10 The Embrittlement by 475*C is prevented by keeping FN <14 Example: Some refinery specs required FN on SS347 <9 to prevent the Embrittlement (475*C Embrittle + Sigma phase embrittle)   There are a number of different types of steels that may be referred to as ‘stainless’; previous articles have considered ferritic and precipitation hardening steels for … Continue reading Ferrite content in stainless steel and embrittlement

What is Coalescer or coalescence filter?

Coalescer 1;  Coalescer is used to separate Emulsion substances such as water and oil (hydrocarbon). By using the unification principle of small liquid droplets into larger droplets as the material flows through the coalescer element. Coalescer 2;  The work of Coalescer will have three phases starting from filtering out the impurities ( Filtration), then the droplets will form a larger drop. (Coalescence) through multiple filters and finally, gravity will cause water droplets, which are denser than oil, to precipitate down to the bottom of the Coalescer (Separation) Coalescer 3;  Samples and looks Coalescer: Continue reading What is Coalescer or coalescence filter?

What is Rupture Disc?

Rupture Disk;  Rupture Disk is a pressure relief device that does not close. (Nonreclosing) by releasing the pressure when the Disk breaks ( Burst) at Burst Pressure Rupture Disk is often used together with Pressure Relief Valve (PRV) to prevent corrosion from the process fluid touching PRV. Rupture Disk – Installation;  The Rupture disk installation is directly between the Rupture disk and the PRV. There must be a Vent Pipe or Pressure Gauge to check if the Disk is leaking or cracking. When we remove the disk for inspection or maintenance, the PRV should replace the disk because the Disk … Continue reading What is Rupture Disc?

What is Field Metallographic Replica?

Field Metallographic Replication (Replica) 1;  Field Metallographic Replication, or Replica, is the peeling of a workpiece and used in an endoscope. Microstructure To indicate features and changes Metallurgy (Metallurgy) of the workpiece. Field Metallographic Replication (Replica) 2; How do Field Metallographic Replication (Replica)  Continue reading What is Field Metallographic Replica?

Steam erosion on Flanges (Samples)

Steam Erosion at Flange / Gasket Face (Case Study 1);  Erosion (Erosion-Corrosion) by Steam area Flange / Gasket Face of Tubesheet of Shell and Tube Heat Exchanger, so remember to check the area. Flange / Gasket Face thread. Steam Erosion at Flange / Gasket Face (Case Study 2);  Another Case study of the Steam Erosion at Flange face (Gasket face) of Top Outlet Nozzle of Steam Tower. Continue reading Steam erosion on Flanges (Samples)