Recent content by OpticControl

Hello, Based on the manual, we have set the ACS255 to the following operating parameters: Parameter 9902 is set to 0 Parameter 1103 is set to 1 These settings essentially should allow us to operate the VFD while the DI2 is closed (Run enabled). See image. This is an out of the box VFD. We...

Hello, I am commissioning an ABB VFD ACS255 IP20 model. According to the manual the input is 120VAC 1PH and the output is 230VAC 3PH. I have it wired to a Baldor motor that is 230V, 3PH and 60Hz. I have the VFD configured with the motor specifications. When I try to start the motor on...

Thanks @xnuke. That's a good perspective. Based on your current designs where you include an SOV already with at positioner, do you install the SOV in series with the output port of the positioner? Reading through the manual of these positioners, apparently when the positioner loses...

Hello, I am exploring the idea of using a so called "digital valve controller" (a.k.a. positioner) instead of SOVs for on/off valves. Multiple manufacturers offer what is known as a "digital valve controller" which is a programmable electro-mechanic signal converter that controls the air...

Question, Yesterday I was disturbed by a really loud explosion in our back yard and electricity went out. When I turned to the window I saw sparks falling down our backyard so I immediately new there was a problem on the transmission lines. I took a picture of what seems to be a fuse...

Greetings, I am currently reviewing the need to prepare an specification for electrical annunciation panels. The ISA 18.1 addresses electrical announciators yet I am wondering if these are still relevant in the process industries for other purposes than machinery control panels. In modern...

Hi, We have atmospheric tanks that do not have PVRV and we still comply with safety and hazardous considerations. The vent size is determined based on relief flow conditions. Regards, OptiControls

On that table I don't see the LNG projects in Australia. I know of the following: Gorgon LNG Wheatstone LNG Gladstone LNG (GLNG) Asia Pacific LNG (APLNG) Queensland Curtis LNG (QCLNG) Itchthys LNG Pluto LNG Darwin LNG And of course Prelude FLNG

Hi all, I am looking for an analyzer capable of detecting traces of H2SO4 in a gas sample (ABB, Emerson, Yokogawa, MT, ThermoFisher, Siemens, etc.) I have looked all over the place and I can't seem to find one, or at least the datasheets don't mention H2SO4 detection. Does anybody have a...

Do you have the source of the table?

@Amanda123 To give you some perspective, in my plant we have a hot oil storage tank with N2 blanketing to prevent degradation of the hot oil. The tank is protected with a PVRV (pressure Vacuum Relief Valve) and we do not have a PAL (pressure alarm low) on the N2 line. Regards.

I am assuming that you are only referring to the methane liquefaction process exclusively. You have listed two of the most dominant processes, CoP Optimized Cascade and APCI C3-MR. The selection involves a financial studies and technical studies that consider equipment quantities, sizes, energy...

First and foremost, yes you can use a limit switch in a voting scheme. On the other hand, assuming that this is for a Safety Instrumented System (SIS), limits switches have a higher failure rate when compared with process transmitters. With that in mind, perform the SIL calculation and...

My understanding from the Mettler Toledo GPro 500 is that is a real-time non-extracting sample analyzer. Regards.

Analyzer Technologies I am putting together a table for quick reference on analyzer technologies used in the oil and gas process industry. I would like some advice from the community to review the accuracy of the table and potentially add any technology that I may have missed. Detector/Sensor...