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Hi,We are designing one of the biggest units which has control valves of size 20inches and above. The in-house standards do not allow globe valves on the bypass as they are very big but only allow gate valves which will not help in throtlling the flow. One solution suggested is to go for two 50%...

Dear All, Currently we are designing a MDEA Amine regenerator unit. The Amine is coming from VGO Hydrotreating ubit with 0.4mole Hes loading.We are doing the conventional filter system(Mechanical 5 micron pre and post filters ad Carbon filter on a 10% side stream-only 5% thru carbon) but are...

Friends, I recently came across a HAZOP study which included the following in NOT CONSIDERED list: 1. Failures of Manual valves 2. Operator Error 3. Passing of NRVs and PSVs Is it OK? Pl give your views. Thanks in advance.

Guys, thanks for responding to my last query on MDEA max reboiler temperature. But will anybody help with some info OR articles/ references on design tips for MDEA regenerator improved friendly troublefree operation?? Thanks in advance

We are in the process of designing a MDEA regeneration reboiler. What is the max heat flux and what is the allowable Delta T? Can MP steam (about 180 Deg C) be used for heating? Thanks in advance!! Note.This was inadvertantly posted first in Chemical environmental Control forum first. Pl reply...

We are in the process of designing a MDEA regeneration reboiler. What is the max heat flux and what is the allowable Delta T? Can MP steam (about 180 Deg C) be used for heating? Thanks in advance!!

While it is clear how to design relief for a single equipment for Fire case, What will be the basis for sizing the relief header from a process unit consisting of only liquid filled vessels and only case is fire case for each of the PSVs? In short, do we take one vessel or multiple vessels under...

Can somebody give some idea on how to get the air flow required for sparger mixing of caustic in a tank. Sparger design procedures demand the air flow first. But how to get that flow? Thanks in advance

Can somebody give some suggestions for a good simulator package for MDEA absorption and regeneration for treating recycle gases from various Hydrotreating units? and if FCCU gases are also treated by the same amine unit? I have already seen the earlier threads but anything new will be...

Hi All, We have a P&ID showing a liquid seal (an inverted U) at the outlet from a Overhead(OH) condenser to the accumulator below. The accumulator is having a split range fuel gas/flare pressure controller. The flow is by gravity from the condenser to the accumulator as there is a pressure...

Hi all, We have a thermic fluid heater in the system design. The heater is cut off and and the flow to heat exchangers are cut in case of plant emergencies. what do we do to protect the thermic fluid heater coil? Do we flush the coils with inert gas? Heater Vendor has not given any...

Hi, I am in a dilema: Where should I put my Flow Control valve controlling feed flow to the column? At the outlet of a preheat exchanger or at the inlet of exchanger. The liquid is getting heated close to its bubble point in the exchanger and might start vaporizing if there is no CV downstream...

Hi, I have to choose a Pressure control for Net Zero vapor generation system with no light components - sort of kerosine splitter. I have the "Steady under pressure - pressure control techniques" by Sloley giving 26 different methods with plus and minus for each scheme. But I would like to know...

Guys, this might not be the right forum but still being a refinery person forced to work on a wellhead crude stabilization project simulation, I want to know how to reduce the RVP of light crude to about 5psig using only gas-oil separators? In refinery stabilizers, we always went for a...

Hi, Is there some free literature on the above? Any working plants by reputed big companies? I have read abstracts of a few papers but nothing giving much details? Someone is trying to sell our refinery a visbreaker cum Vacuum distillation followed by hydrodewaxing process to produce diesel out...

Hi, Can anyone help me whether Olefins in C6 -C8 range can be removed by strong sulfuric acid(95%) treatment? We tried in laboratory to do this with 95% H2SO4 on a 96% pure(rest paraffins&Olefins&cyclos) Toluene cut and we could not get any aqueous phase separation We were trying to get pure...

Hi, Can anyone help me whether Olefins in C6 -C8 range can be removed by strong sulfuric acid treatment? We tried in laboratory to do this with 95% H2SO4 on a 96% pure Toluene cut and we could not get any acqueous phase separation.Where did we go wrong? We cannot afford Hydrogenation.

Is there some free literature on the above? Any working plants by reputed big companies? I have read abstracts of a few papers but nothing giving much details? Someone is trying to sell our refinery a visbreaker cum Vacuum distillation followed by hydrodewaxing to produce diesel out of molten...