As you gentlemen have been so much help in the past, I wonder if you would mind verifying my assessment regarding an IS device installation.
Basically, a 4-20 mA transmitter is connected to a zener barrier and then to a PLC. The transmitter has no hazardous ratings whatsoever. An IS circuit...
A colleague of mine is upset with a request of our ASME QC manager. It involves the min hold time and temperature for stress relieving a large number of pressure vessels.
My colleague did the calcs and drawings with each showing the min required hold time and temperature for each vessel. Each...
Is nonincendive wiring required to be separated from other circuits like IS wiring? I have seen a reference supporting that this separation is required but I cannot locate it. It very well could have been a "recommended practice" from a customer or a manufacturer.
Does anyone know of a NEC...
I hope you folks can help me out here. I am a mechanical engineer but have had to deal with controls for quite a few years. I now have an electrical PE pounding me for information on grounding/bonding practices. I have seen this done several different ways. I know that NEC requires equipment...
Does anyone know of good training resource for acoustical piping vibration? This seems to be a very specialized subject with very little real information on the web. I have GMRC's Pulsation & Vibration Short Course but I am looking for others.
Thanks,
Chris Foley
Midland, TX
I know that I may be searching for a non-existent answer, but I have to ask. In lieu of a customer’s specification for a nozzle load, what should a vessel supplier use for this calculation?
It has been a practice for some suppliers to use nothing. I think that this is a just ignoring the...
I have an application for an oil flow meter in a Class I, Div II, Grp D envirnoment. We have always used a REN Slow Flow meter for this lube oil measuring task. However, this meter has no electrical approvals at all. I am told by the manufacturer that it can be used in hazardous locations...
This a follow post to my "P&ID Symbology" last week. I have worked through ISA S5.1 and created the tags for my instruments with one major exception. I do not see what tag should be used for a PLC. I have used YC for an annunciator as it is really just a state controller. A plc is quite...
**I apologize upfront as this is a cross post. I placed it ISA Controls forum but have not seen many responses. ***
I have been in the equipment industry (compressors mainly) for the past 11 years. I have seen more combinations of symbols used on P&ID that I really care to. However, I have...
I have been in the equipment industry (compressors mainly) for the past 11 years. I have seen more combinations of symbols used on P&ID that I really care to. However, I have been asked to write a company standard. I sort of thought that ISA-5 would contain everything that I needed to know...
