We are looking at installing a new process. However, this process requiress the use of large quantities of NaOH solution. Once we have treated our product with the caustic soda, the soda is washed out resulting in a NaOH solution of 5.5% As a result of using large quantities of NaOH, it will...
One of my junior colleagues asked the following question:
As discussed, I need some info on edductors (they sometimes called steam ejectors). As part of my project I have to determine the efficiency of the edductors and determine possible ways of increasing their efficiency, but there's no much...
We have developed a standard at our company for P&IDs using ISO, ANSI/ISA and the SSG (Pulp & Paper) standards as a basis. I receveived a couple of comments regarding OPC's:
On the off-page connector arrows for primary and secondary lines, do you say "From pump no....." or "From tank...
What would form part of one single control loop? I have level in a tank that speeds up or slows down feed pumps on low and high level. The same tank level will also close a feed valve (on/off valve with limit switches) on high high level. Would the level transmitter and associated level...
Can someone please give me a definition of a control loop as shown on a P&ID? What is included in a control loop.
Should interlocks be shown on P&IDs? Interlocks for a paper machine for example are quite complicated and it is the general feel that it should therefore not be shown. Interlocks...
I have previously asked about strip P&IDs vs. sheets and got the answer I wanted. However, most of the response I got was, as I can figure it out based on US standards and the petrochemical industry. Apparantly things are totally different in the paper industry! I was told that PFDs and P&IDs...
Our company has bought a number of plants. We are trying to standardise on P&IDs. Some plants use the scroll type or strips while others are using sheets. My personal preference is sheets but in order to convince those who have been using strips or scrolls for over 20 years I need some...
