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Hi all, HYSYS reports two types of "liquid flowrates" in its conditions results tab as follows; 1. std ideal liq vol. flow in barrels/day 2. liq volume flow@std cond.in barrels/day the values assigned to these two conditions are usually close. but my question is, what is the real difference...

Hi all, I am trying to perform a capacity check on an existing vent header. My largest venting load has been determined. Is there some sizing criteria that one can apply to ensure a suitable vent header size. I know that relief header considers the mach number and the rhov2 criteria in...

Hi Guys, Does anyone have useful guides or reference on vent system sizing such as the sizing of the vent header and the vent scrubber? I am more farmilar with flare header sizing using flarenet and flare scrubber sizing using the API 521 criteria. thanks Buchi

Hi all, Has anyone used flaresim lately for performing flare radiation calculation? I am trying to figure how to use this software for rating an existing flare stack i.e, i already know the stack height, and would want to determine what would be the radiation on receptor points for this stack...

Hi Guys, Can someone help explain to me, in simple terms, the effect of entropy on process equipment design. thanks Buchi

Hi gangs, can anyone help with calculation method for determining the rate of injecting corrotion inhibitor for a give flowrate through the pipeline. best regards, Buchi Buchi

Hi gangs, I need some clarification on determining the shell length for vertical separator. I am using seventh edition of API 12J, october 1, 1989. If you see page 13, Appendix C - Design and sizing calculations. There is a table c.1 titled "K factors for determining maximum allowable...

Hi gangs, I am trying to set up a model for an Oil processing facility (FLOWSTATION) consisting of three separators stages at different conditions. I am using HYSYS. If the first stage separator is operating at 100 psig and 50 degree C (say), and the second stage is operated at 50 psig and...

Hi all, please could someone help me out with any useful tip on how to specify the flow efficiency in PIPEPHASE. i am modelling a 9km flowline and it seems the flow efficiency affects pressure drop to a large extent. thanks guys, Buchi Buchi

Hi guys, can someone help me with any rule of thumb on the allowable pressure drop across a wellhead choke. I know that an excessive pressure drop across the choke can give rise to operational issues like hydrate formation and stuff, can there be an allowable pressure drop number like...

Hi guys, i am performing a two phase line sizing using a specialized software. I discovered that the software used "no-slip mixture density" instead "mixture density" for calculating the erosional velocity. can somebody tell me the rationale for this and the difference between both densities...

Hi guys, i am sizing a PSV for blocked outlet for pressure vessel. the challenge i am having now is knowing the temperature to use at relieving pressure(set pressure +overpressure +atm). I feel particularly uneasy to use the operating temperature because i believe that when PSV is relieving...

Hi Guys, i cant seem to differentiate between "flow assurance" and "hydraulics" in terms of what both are meant to achieve. I know flow assurance deals with pressure drop, temperature drop, wax formation and gas hydrate formation which can inhibit smooth flow. My understanding of hydraulics...

Hi guys, A quick one. Please what is the minimum turn-down of a typical turbo-expander gas plant. If a gas plant is designed for 100MMSCFD ,say, can it be turned down to 10MMSCFD (10 % of the designed capacity) or 0MMSCFD for that matter. please i will appreciate you urgent response. Buchi

HI Guys, How can i achieve closed and open drain segregation using a "liquid seal loop". I am aware that segregation can also be achieved by using two separate headers - open and closed drain headers. please any reference on drain segregation will highly be appreciated. Buchi Buchi

Hi gangs, i am interested in knowing the difference ( in terms of detailing) between the P&ID generated at the Basic Engineering stage and that generated at the detailed engineering stage and issued for IFC. cheers, Buchi Buchi

Hi gangs, i have been trying to figure out the major difference between SIS (safety instrumented system) and HIPS (high integrity protection sytem), can somebody help out here? Buchi Buchi

Hi gangs, can some one explain to me the concept of film boiling in heat exchangers? cheers guys, Buchi Buchi

Hi guys, i need explation on surge calculation in pipeline hydraulics. what it is all about, why do we have to do it, how to go about e.t.c. i will appreciate a very simplistic explanation. cheers Buchi

Hi guys, can somebody explain to me in a very simplistic language the meaning of DCS (distributed Control system) and PLC(Programmeable Logic Control) as applied to plane design. Buchi