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Thanks to everyone for your comments.

Dear Colleagues, I would like to consult with you regarding the following issue. We use a mixture of hot brine and condensate as a heating agent in the preheater. The water and condensate is mixed at the preheater inlet. The brine pressure at the mixing point is 10barg while the condensate...

The file attachedhttps://files.engineering.com/getfile.aspx?folder=26064b40-589c-4c2c-8f98-f6b66d2523c7&file=B-B.PNG

Thank you All. I found the 1st equation in the "Beggs-Brill Two--phase flow in pipes" book. Please see the attached. In the equation Vm is 2-ph mixture velocity. For which applications the 1st and 2nd forms are applicable? Thanks, Mike

Dear Colleagues, I found in a literature the different form of the Froude No. equation: Fr= V^2/g*D, instead of the well-known form: Fr= V/SQRT(g*D). At the same velocity the equations gave the different Froude numbers. Which of the equations is more correct? Thank you, Mike

I thank you all. Kevin, Assuming the thermal losses through the uphill section is 2 deg.C, the P2 (vapor pressure) can't be lower than 4.7 barg. But on the other hand,the P2 is set by: the downstream re-injection pressure + two-phase fluid friction losses through the downward pipeline -...

Gentlemen, Thank you for the useful recommendations (I gave you two stars). Assuming, we will implement the control logic, as you suggested, including the pump's VFD control. Based on your experience, How practical it is to keep the more than 2,000 m pipeline pressurized, without hammering...

Hello, I am involved in the design of 8" geothermal condensate pipeline, its function to transfer the hot geothermal condensate from the Plant to an injection well. Since the condensate is at the saturation conditions( 5 barg& 159 deg.C),there is a pump station, which increases the condensate...

Gentlemen, Thank you for your answers. Is it possible to estimate the minimum condensate velocity (low operation mode) through the vertical riser so that gas bubbles will be swept out? Thanks, Mike

Hello, Does anyone have experience with this? Here's my situation: We design a power facility which utilizes geothermal steam, which contains about 23% w. of non-condensable gases (mostly CO2). Steam enters to a kettle reboiler and condensed. The two-phase flow of condensate + steam/NCG at the...

Thanks you all for your valuable and quick answers. I believe I will design it for self-venting as Katmar proposed ( 10" vertical section ) A few more details to add and a question: The horizontal section here is very small ( the condensate tank is right beneath the condenser and will be...

Hello all I have a question regarding design of pipes for gravity flow and self-venting flow regime. There is a steam condenser (not a direct contact. A shell and tube ) ,which its condensate flowing from the bottom of the condenser head and to a condensate tank downwards. At that condensate...

For now, I will design for case 2 (two valves). I am still concerned about the high velocity flow through the blow-down pipe to the atmosphere. What do you recommend the vapours' max velocity criteria of design should be, to avoid the noise restrictions?

Hi, The application is designated to EU power plant. We do have restrictions on the noise level. I can't do an experiment to check it. my concern is, whether the pressure drop on the second valve and the release of vapours will cause high noise level. with the valve vendor's software it looks...

Hi, I have a vaporizer with a constant blow-down to the atmosphere of CO2 and Steam. The standard design for this blow-down is using silencer downstream of a control valve (attached case 1) I wondering whether I can use another control valve instead of the silencer (attached case 2) and still...

Yes,The pump pump running continuously.The difference in fluid levels is about 5 feet.

You meant we need to install some kind of a restriction in the line from "B" (low level separator),not from "A" ? The phenomenon of the different levels also exists when pump is run and is stop. Therefore, as I wrote before, my thought was to install a throttling valve at the condensate outlet...

I'll try to explain the issue more clearly. We have two steam/water seaparators located upstream of a steam turbine. It function is to separate steam (quality about 99.8 %w) from traces of water before entering to the steam turbine. The separators are connected in parallel but due to asymmetry...

BigInch, Thanks for your reply. The question is if the balancing line connected to the bottoms of the two vessel as you suggested can equalize levels between the two vessels operated at the different vapor pressure? The 1st separator is operated at 236 psig (separator with high liquid level)...

Hello, In our power plant we have two similar steam "polishers" connected in parallel installed upstream of a Steam Turbine. Due to asymmetry of the polishers inlet two-phase (steam quality is about 99.8 % w), and steam outlet pipelines ,the polishers are operated at the different loads. The...