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I don't think above calculations is correct though. Any input would be highly appreciated.

Thanks all for your input and help. HiCompositepro, Thanks. Yes, that could be the reason - i will double check. Just one correction though - that looping out might be due to preventing the high pressure switch exposure to vacuum and not other-way round.

Thanks all, I don't think Raoult's law would be applicable here. Please let me know if my calculation below is correct Here, X is mass % of component x ((X⁄300))/((((100-X))⁄18) )=0.001/10 ((X⁄300))/((((100-X))⁄18) )= 0.0001 x/300=(0.0001*(100-X))/18 18X=0.03*(100-X) 18X=3-0.03X...

Hello all, One very quick query please. We have a high pressure trip on reactor set at 12barg which stops the reactor reactor pump. Once the reaction is completed, reactor is depressurised to atmospheric pressure and then vacuum of say 800mbara is applied. There was a discussion that our...

Hello all, Need your help please. I want to calculate amount of component x condensed along with water vapour during reaction. The reactor batch is 10 tonne. The reaction takes place at 180 degC at which component x is removed and condensed. Vapour pressure of the component x at 180 degC =...

All, Thanks everyone for your input. Just to answers your questions: 1)Absobed power for new pump is 14kW while it was 20kW for the old pumps 2)The shapes of not pumps are quite same/similar. 3)Pump position is no different to the previous one and maintenance people are confident that...

@LittleInch, Thanks for your reply and clarification. In fact, we are experiencing very temperature at the bearings and bearings are failing prematurely and it's such a high temperature that causes the bearing to pull away and the lubricant is turning in to powder. Yes, we are aware of...

Hi all, Need your help. We have bought bare shaft centrifugal pump (without motor)which requires 20kW motor however we have motor with power rating of 27kW on site from old pump and we are planning use this motor. Please note there is no change in operating point (flowrate and head) of the pump...

Hi georgevergese Thanks for your reply. Ok. I will ask details on dryer. Now let's say if we assume recirculation flow rate from pump P2 is 10m3/hr and at that flow rate, the differential head (total head) required for recir line (red line) is 30m while the differential head required for...

Hi all, I need your help/input please. Please see below link where I have attached a simple drawing of the system. As you can see, pump P1 (7m3/HR) pumps hydrocarbons to dryer (D1) via heat exchanger (HX1). In the dryer, liquid is sprayed and pressure is maintained at atmospheric pressure and...

Thanks LittleInk. At pump suction, along with changing valves, we intend to increase suction pipe size, reduce number off bends etc as well. Yes, I confirm they are manual isolation valves. Thanks KS

Thanks LittleInk With regards to using gate valves at discharge of PD pumps, my colleague's argument was that gate valves doesn't give good sealing/control (just like globe valve) especially due to high pressure of 70barg but I don't agree! Thanks for your clarification of internal PSV's...

LittleInch Thanks for your reply. Yes, we intend to use full bore ball valves at the suction. I have asked those questions as not sure what was considered during original design that globe valves have been used? E.g. Would there be any scenario that would cause reverse flow from PD pump and...

Dear all, I need your help please. Currently we have high pressure boiler (to generate saturated steam at 60barg, 2000kg/hr) feed pumps with the below stated configuration. The boiler feed water pumps are high pressure PD pumps (duty and standby) on inverters with the operation pressure of...

Pennpiper Thanks for your reply. Below are the comments against yours. 1) material (vapour) is additives for polymer which melts at 60deg C and trace heating. 2)vent header is open to atmosphere. 3)vent header is slopped to the source tank/s and hence drain to the tank/s. Not sure if that's...

Hi all How would I check if my vent line or vent header is blocked? Is there any cost effective technology that I can use to make sure if it's blocked or not? Do you think ultrasound or thermal imaging camera are useful? Please note, the vent lines in questions are steam traced due to the...

Thank you all once again, your inputs are very useful and very valuable as usual...👍 Thanks KS

Thanks all I guess, it will also have cost of utility and power etc? Where I work, these are the two biggest elements while raw materials is very cheap. Thanks KS

Hi all I am working on a FEED stage of a project and I want to estimate operating cost (OPEX). Agree, from name it's evident that operating cost e.f. Running pumps, compressors and utility cost should be considered at the least. What else should be considered please? Any example template...

georgevergese Thanks. I believe you are talking about reaction forces. If so, will do. If not, please elaborate. KS