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Hi All, I am seeking your technical views on the recommended slope of flare subheaders in onshore and offshore facilities. In order to ensure adequate drainage, the slope typically is 1:200 by some engineering guidelines. Flare main headers typically are designed for slope 1:500 In view that...

Hi All, I am seeking your technical views on the recommended slope of flare subheaders in onshore and offshore facilities. In order to ensure adequate drainage, the slope typically is 1:200 by some engineering guidelines. Flare main headers typically are designed for slope 1:500 In view that...

Dear All, I have been reviewing several design schemes where waste heat steam generators have the water fed/generated steam fed on the shell side as a design measure for condensate removal and minimized pressure drop/water hammer issues in case of allocated on tube side while in other designs...

Dears, Across many designs and existing installations of associated HC gas centrifugal compressors, nitrogen used as secondary labiranth seal is typically of 95%-98% purity and easily supplied by membrane technology. Recently, there has been some views on the need to change the required...

Dear All, In some application we deploy dedicated plant air supply from air compressor packages for use as utility cleaning stations such as purging equipment. This non-critical supply can be fed directly after the air compressor and upstream the dryer package. In this case, is there any...

Dear All, I need your feedback on the experience in implementing Auto-Variable Pitch for greenfield applications of forced or induced draft coolers. I believe it can offer a degree of air flow control but do have some reliability issues. Appreciate sharing your experience or any lessons...

Dear All, The air side fouling resistance was specified as 0.00035 W.m2/K in one of the engineering specifications. In my view, this is even almost equivalent to crude oil applications I would like to ask the basis of such specification, is this targeted to maximize the pressure drop across...

Dear All, if the design involves a pressure vessel which shall be designed (UV stamped) in accordance with ASME SEC VII code, and if fire is the only overpressure scenario, would it be acceptable to waive the requirement of PSV since UG-140 of the same code is stating overpressure protection...

Dear All, In view of different designs of CO2 compressors employing one common anti-surge recycle line, I have critically analyzed through ready Compressor control vendors manuals that an ideal design should have independent anti-surge control loop across each stage since each stage has...

Dear All, As part of the design of wet CO2 compressors (MW 43) with suction pressure = 0.3 barg while discharge pressure at last stage is 40 barg. I have gone through the possible control mean with a a variable IGV against performance control through motor speed variation. I understand that IGV...

Dear All, I need your feedback regarding material selection typically followed for hydrogen compression unit which operates at temperature range from 65 C to 180 C (downstream compressor discharge) and pressure ranges from 1 barg (unit suction pressure) to 200 barg (unit outlet discharge...

Dear All, I would like to enquire on the requirement for nitrogen pressurization of Marine loading arms, I believe it is a safety requirement for keeping Marine loading arms position intact. Is there any international standard requirement reference for the same and : - Is this a continuous...

Dear All, I need your feedback regarding any specific offshore criteria available in good design practice which tends to request the designed to consider less buffer time for sizing the utilities vessels (IA, PA and N2 receiver vessels) on offshore Jetty platforms. Would there be any...

Dear All, I am trying to run parallel reaction system using Rstoic in ASPEN Plus software, I am facing difficulty in estimating the thermodynamic properties for the component called S2--> di-atomic sulfur which is produced as part H2S decomposition : H2S--> H2+ 0.5 S2 I tried all EOS including...

Dear All, I am seeking your kind views on the methodology/tool to be used for calculating fugitive emissions from double deck/single deck floating roof tanks specifically. I believe in order to model the thermal profile of the tank, surface solar radiation onto the roof which may dictate a...

Dear All, I would like to seek your views on the use of sight glass elements on drain lines downstream the drain valves. Are there are any integrity issues associated with their use. Some operational experience recommend their use to monitor drain valve's passing / inadvertent opening...

Dear All, As we all know, pilot operated are recommended by PAI 520 PI for two phase application as they excellently withstand the variation in backpressure which can reach up to 70% of the PSV set pressure. There is a sub-category of the Pilot operated valves which is called non-flowing type...

Dear All, I would like to enquire whether from operational perspective, there is a need to have throttling at the chemical injection point besides knowing that the chemical dosage can be adjusted via the pump stroke. The example I am presenting here is only for a single injection point fed...

Dear All, it is generally understood that direct solar radiation of aboveground piping/vessel systems mandates installing TERV to accommodate liquid volumetric expansion as a result of heat up of subcooled liquid at calculatable rate. However, if a piping system is installed under shed (shade)...

Dear All, I would like to understand specific design safeguarding items about multi-head (dedicated head for each injection point) pump design: a- does each head has its own diaphragm? b- in case of failure of a diaphragm of one of the heads, would it be fair to initiate a shutdown of the...