I always heard that it’s not recommended to drill one junction Box on site due the lost of the certification. Ok! But there are junction boxes for classified area that are provided with removable gland plates, enabling on-site drilling. On this case how the certification works? Where (standard)...
Generally in the projects of my company we provide just one Control Panel to control our skid, all instruments signals (AI, DI) go directly to this CP (Control Panel) and our PLC communicates with the OIL Rig master PLC. But in one client standard I saw this information that we must follow...
According standards, to install a pressure transmitter, if liquid, the process connection shall be from middle to bottom, if gas, from middle to top.
But when the instrument used is one PI (Pressure Indicator) I always see on top (90 degree) for liquid or gas. For PI, don’t I need to follow this...
When I have to specify Pneumatic transmission lines for instruments generally I use as material ASTM A 269 GR.TP 316.
But now I have one project in my hands where my instruments (i.e. PDIT) will work with seawater. My process team is concerned in using this material due the possibility of...
I have one big skid (in one oil rig) with a lot of instruments (level and pressure transmitters, control valves, on-off valves, etc). I was planning to install one control panel in this skid and rout all instrument cables to this panel, and use optical fiber to connect this remote panel with the...
I have one big skid (in one oil rig) with a lot of instruments (level and pressure transmitters, control valves, on-off valves, etc). I was planning to install one control panel in this skid and rout all instrument cables to this panel, and use optical fiber to connect this remote panel with the...
I have one P&ID that shows two pumps. I have one PIT installed in the admission and another PIT in the discharge of the both pumps. Each PIT send their signal to one virtual FI (there is one note saying that this FI is one SOFT TAG) and this FI is sum with the other FI of the other pump and the...
I have one P&ID in my hands and there is one vessel with one instrument that has the Tag LZIT.
I don’t know what the “Z” means! I know LI, LIT, LG, but LZIT…. I don’t know what this level instrument does exactly. Can somebody help me?
I’m in doubt about grounding instruments. I have EExd instruments and IS (intrinsically Safe) Instruments. I saw a long time ago one project showing 2 grounding bars, one for EExd instruments and another one for IS instruments. Should IS instruments grounded in a separated bar? Is there one...
A long time ago I remembered I saw one standard (I don’t remember wich: ISA, API, etc) with all instruments datasheets. LIT, PIT, PI, LSH/L, ZSH… all instruments! I need to prepare instruments datasheets for my company. What standard shows instruments datasheets form?
May somebody help me?
I need to know what standard describe in detail transmition of analogical and digital signals. I need to prove (based on standards) that it's possible transmit analogical and digital signals in the same multicable without problems.
Obrigado! thankyou!
I'm Electric/Instrumentation Engineer from Brazil and I work with projects for Oil rigs (Petrobras). Sometimes I see projects with analog and digital signals in the same junction box, so in the same multicable.
Can the bought signals (LIT and ZSH for example) "live" in the same multicable...
