Hi Friends,
I'm trying to determine the origins of the terms "FPM" and "FFPM." It's not uncommon to see "FKM/FPM" or "FFKM/FFPM" (or variations) when generically specifying fluoroelastomers and perfluoroelastomers respectively—or fluorocarbon and perfluorocarbon rubber if you will. From both...
Hello fellow engineers!
I live in a 100-year-old building with painted galvanized steel siding. The paint is severely damaged and is flaking off (please see pics). There are areas of surface rust, but nothing I would consider serious. I do not know if this is the original paint or if/when...
Hi friends,
According to this web page, pressure vessels conforming to Section VIII may incorporate acrylic cylinders and be U-stamped. The page goes on to say "The American Society of Mechanical Engineers (ASME) has now approved the use of acrylic in the construction of pressure vessels under...
Hi friends,
I work for a company that manufactures liquid chromatography columns for biopharmaceutical purification. On most customer specifications that I receive for these columns, a U-stamp is requested or, at least, "conformance to Section VIII." I am also involved with the authoring of a...
I am confused by all of the features normally found on a "typical" control valve actuator. To keep this post simple, I am referring to the traditional diaphragm actuator type represented in the link. The purposes of the diphragm, spring, and actuator shaft are obvious. However, if all I'm...
A borescope video log of the welds in a 316L sanitary tubing system was sent to a third-party inspector and they have rejected 17 welds due to "slag." Based on my limited understanding of common welding practices, I thought slag was the result of using a filler material or welding dissimilar...
Hi all:
I have a piece of equipment with two (2) 480 VAC 3-phase motors on it. One of these motors is controlled by a VFD, the other is branched directly from the main feeder. When my customer has the equipment located in Room "A" both motors rotate in the correct direction. When the...
Hi, all:
I've read a few posts and think I might have the answer, but thought I would run this for any experts who can confirm. I have an RTD whose leads are not long enough to reach my controller input (an Opto 22 RTD "puck"). My initial thought was to terminate the leads at a...
