Recent content by sheiko

Latexman Sorry but I believe 75% is not the volume fraction at standard condition but at actual condition (lab measurement). Maybe it looks a 9th grade question but sometimes things look obvious but are not. I remember from school that gas composition change with T and P...so what if 75% vol...

Thanks So Zdas says mass fraction and latexman says volume fraction. I need more feedback please @Latex Shall I use volume fraction at standard conditions so?

Dears I would like to have a confirmation here: Suppose I have 1000 Nm3/h of gas containing 75% vol of hydrogen (or around 2% mass). If I want the flowrate of pure hydrogen in Nm3/h, shall I multiply by the hydrogen mass fraction or volume fraction? TO me it is clear that Nm3 (standard volume)...

Good day, I am researching the EN ISO equivalent to: API 650: storage tanks API 2000: atmospheric storage tanks API 560: fired heaters API 660: shell and tube heat exchangers API 661: air-cooled heat exchangers API 674: positive displacement pumps, reciprocating API 675: positive displacement...

Thanks Discussing with the reliability guy, I have learnt that PAL and PSLL on discharge side aims at limiting flowrate above 10-20% of BEP. In fact, only PT were available on currect pumps when decision to install additionnal safety loops has been taken. So the choice to install PSLL instead...

Hello everyone I was wondering if there is any standard or recommended practice regarding typical alarms and trips to be implemented around centrifugal pumps? The reason is: in the refinery I am working in, I see plenty of alarms and trips that I don't see the purpose. For exemple, on pumps...

Ione thanks but I am not talking about fouling factors. I do know what it is. Please read srfish answer to understand what I mean. @Lionel_Sheiko / geniechimiquefacile.com

Guys I have an additionnal question if you allow me. During the design stage of a new heat exchanger, temperature cross (hot outlet minus cold outlet is negative) means low F which in turns means that some part of the surface is useless (no heat transfer). so why during operation (once the...

Thanks But it's not MY success.. I have just noticed that (the only one unfortunately). @Lionel_Sheiko / geniechimiquefacile.com

Thanks Dale Do you mean a decrease of F means better performances? @Lionel_Sheiko / geniechimiquefacile.com

Additionnal data: C = crude D = diesel I = in O = out M = mass flowrate Cp = specific heat Before shutdown: Tci = 152C Tco = 205C Tdi = 280C Tdo = 219C Mc = 47.5 t/h Md = 37.9 t/h CPc = 0.62 CPd = 0.68 After shutdown: Tci = 143C Tco = 207C Tdi = 272C Tdo = 186C Mc = 45.7 t/h Md = 32.8 t/h CPc...

Hello The performance of one of our shell and tube heat exchanger has changed in a significant manner. The service is crude oil in the tubes and diesel in the shell. It has 1 shell pass and 4 tubes passes. Tube side equipped with turbotal Surface is 197 m2. Before a shut down, performance...

Books by Norman Lieberman for sure. @Lionel_Sheiko / geniechimiquefacile.com

Max. allowable backpressure = 1.21*MAWP - Pset for fire case Max. allowable backpressure = 1.10*MAWP - Pset for non-fire cases "We don't believe things because they are true, things are true because we believe them."

Hi, This is not a student question at all. It is such an important subject that Norman Lieberman has devoted a whole chapter about this in his new book "Process Equipment Malfunctions". The main reason for the discrepancy between the real level and the level gauge indication is density. In...