At upstream process (PLEM, SSIV, SSCV) to Riser, in case of emergency shutdown (ESD) or depressurizing (process shutdown – PSD), the BDV valve automatically/remotely opens to release high pressure fluid flow to flare system. The following are guidance for developing the BDV (Blowdown Valve) to flare system: BDV Sizing and Its Line Sizing to Flare-system The BDV size is same with the inlet and outlet line size. How to determine the appropriate line size? You must determine the maximum flowrate through this BDV line during depressurizing. Hence, you have to conduct depressurizing study-workshop at first. Based on the maximum flow … Continue reading What is Blow Down Valve and Sizing BDV?

High-temperature corrosion is not a form of electrochemical corrosion that require a liquid electrolyte cell. The high-temperature corrosion mechanism causing by metals react directly with gaseous atoms in the atmosphere rather than ions in solution. Sometimes, this type of damage … Continue reading What is high temperature corrosion?

Caliper Pig – Introduction; Caliper Pig is a device (Tool) used for monitoring the Pipeline, especially with the underground or under water (Subsea) by Caliper Pig is then inserted into the tube (In-line Inspection) and will be run by the compressed Flow of Fluid. Caliper Pig will have legs or Mechanical Arm to measure Inside Diameter of Pipe. Surrounding with an Odometer attached to the Caliper Pig to run inside of the pipe. Caliper Pig  or Geometry Pig can check dents (deformation)  and roundness (ovality) of the Pipeline throughout the length of the pipeline by Mechanical Arm measurements include the ability to show the location of Defect from the Odometer. Lets see examples of the results of the survey by Caliper Pig for Underground Pipeline. Caliper Pig is measured Inside Diameter of Pipe and display as 3D … Continue reading What is Caliper Pig – Pipeline inspection

Most types of stainless steels have good weldability and can be welded with all arc welding processes (GMAW, FCAW, GTAW, SMAW and SAW).  Stainless is used in many different applications for its strength, abrasion resistance and corrosion  resistance.  Unfortunately, many assume it can be welded just like carbon steel. In fact, this is the first and worst mistake that can be made: assuming it will weld (and behave) like carbon steel. This post will not attempt to provide a crash course in welding stainless steels.  Instead, we want to focus on 5 of the most common mistakes made when welding … Continue reading Stainless steel welding notes