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Hi, According to Shell DEP, "If the pressure may drop below atmospheric pressure due to utility failure, instrument failure, low-load conditions, mal-operation, blocked-in situations or any other cause, the minimum possible absolute pressure shall be stated in the documents for mechanical...

double click on a stream - Attachments Tab - Utilities - Create - Property Table - ...then hi Under Connections Tab variable 1 - temperature mode - incremental (specify range and # of increments) variable 2 - pressure mode - state (specify the required pressure); Note: if there is a change...

yes, it can be used to model/size different units within the gas plants. it can do many things, from sizing a simple line to modeling and optimizing whole plants. you can both, modeling existing plants and designing new ones. just type on google "aspen hysys tutorials" and you'll find many...

Hola, design pressure (DP) of discharge line is usually = the set pressure of the upstream relief valve (SP) + pressure given by the static height between maximum liquid level (HLL) in the upstream vessel and pump centerline + shut-off pressure a conservative approach to estimate the shut-off...

Dears, I have an issue regarding the control strategy of the bottom temperature of a distillation column. The system consists of a distillation column with 2 vertical parallel thermosyphon reboilers heated with hot water. Problem: how is better to control the bottom temperature of the column...

hi, and how did you find out U?

hi, in hysys (process simulator), you can only use one type of heat exchanger (tubular); you can't try different types of heat exhangers. based on the input data, it will calculate the heat exchanger duty. it's possible to design the heat exchanger in hysys, but a more rigurous calculation is...

thank you

Hi Latexman, is the heat of reaction (both reactions are exothermic) with regards,

Dear chemical engineers,, Can somebody please give me some examples of industrial processes that are well described by the following type of reactions (beside the alkylation of butene with isobutane)? 1. A + B -> P DH1 < 0 2. A + P -> R DH2 < 0 thank you!

Dears, Thank you very much for your interest in trying to help me. @EnergyMix: I attached again the datasheet. I hope the picture quality is better. The datasheet states there are 7 passes and the drawing also shows an odd no. of passes. Inlet - nozzle N1, left head; Outlet, N2, right end...

Dears, I have an issue with a tubular heat exchanger which was not designed according to TEMA. I have to perform a checking/rating, but I can't set up the geometry according to the datasheet. The program I would like to use for the calculation is Aspen HTFS (which performs TEMA only design...

Thank you both. you're comments were very useful.

Thank you very much for you answers. I still have some issues that are a bit unclear and I would appreciate your support for helping me understand them. "since you know the mass of fluid in the system and the volume you can calculate the (initial) density and temperature at discharging pressure...

Dears, I have double pipe heat exchanger with cold ethylene flowing in tube side at 55 barg and 10 C; it is heated by LP steam (1 barg, in shellside) to 35 C. The duty of the heat exchanger is Q = 2219 kW (normal conditions). If the cold high pressure ethylene is blocked in the heat exchanger...

Thank you for your helpful answers, I apologize, in my first post it's an error. The question should have been if i could calculate the relieving temperature with the following relation: T2 = T0(P2/P0)^(1-(1/k)) (and not using T1 and P1 which are the normal discharge parameters). T0 = suction...

Great! Thank you! So my approach is correct (n = k = Cp/Cv). The PSV is between 2'nd stage discharge vessel and aftercooler; the valve that might be closed is downstream of the aftercooler. I suppose it will have a bit of effect on gas cooling. Kind regards,

Dears, I would like to consult you in solving an issue regarding a closed outlet scenario at the outlet of a reciprocating compressor. Data: I have a 2 stage reciprocating compressor, compressing a mixture of isobutane, hexane and nitrogen. The 2'nd stage suction parameters are P0=4.14 bar and...

Thank you for support.

Dear Gustorf, Thank you for your answer. I read that water hammer is produced by the suddenly closure of a valve. The fluid hits the valve, and then it creates a backward pressure wave (through the hole pipe system (bend, valves, etc), hitting at the end the check valve) leading to mechanical...