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Good day, I'm looking for heat transfer and pressure drop correlations for helical baffles inside a shell-and-tube heat exchanger. I'm considering segmented helical baffles. I've tried to search for literature, but couldn't find anything relevant. Any help will be greatly appreciated. Philip...

Good day, I'm looking at using the explosive welding technique to weld a tube bundle to a tubesheet or header for feedwater heaters. I need to check the ligament efficiency of the tubesheet in order to determine if it can handle the forces imposed by the welding process. I've searched for...

Good day, I want to re-tube feedwater heaters by welding the the tubes to the tubesheet by means of explosive welding. In order to do that I need to check the ligament efficiency of the tubesheet. I've looked at the ASME VIII code, but to no avail. Do I need to run computer simulations to do...

Good day, I need some insight into positive displacement pump theory. I realise the differences between a normal centrifugal pump and a positive displacement pump for example, but I want to know how they perform in a system e.g. in parallel or in series. Nowhere can I find literature which...

Hi, I want to calculate the pressure drop over the core air swirler in a PF burner. The swirler under consideration looks like a stationary radial fan. Any suggestions where I can find loss factors for these types of geometries? Regards Philip Oosthuizen Company info: SteinMuller Engineering...

Hi all, I'm struggling to find literature that addresses the calculation of pressure drop trough superheaters and economisers. I only manage to find literature that is related to small geometrical setups, such as Kays&London. Any help would be appreciated for I need the total draught group...

Hi all, I want to calculate the pressure drop over an ISA (short radius) flow nozzle. I've followed three different approaches to model the pressure drop, but all three delivered different answers. I have a 250mm pipe, with a 191.76mm nozzle. The upstream pressure of the steam is 171 bar @...

Hi everyone, I need to help our C&I guy with a control philosophy of power station boiler. The problem we are faced with currently: During the startup phase, how do we know if there are any condensate left in the superheaters? How do we determine the pressure required to drive the condensate...

Hi, We are busy to service an economiser on a local power station. However, we are encountering extreme difficulties in dropping some of the elements due to interlocking fins, distorted tubes, loose fins acting as stoppers, etc. We are running out of time and I was hoping to find some sort...

Hi all, I want to calculate the leak flow through a labyrinth seal. Do anyone have a usefull set of equations I may use? Regards Philip Oosthuizen Company info: SteinMuller Engineering Services http://www.steinmuller.co.za/

Hi, I'm trying to find the gas emissivity of flue gas in a combustion chamber of a power station. I know that there are many text books that give three graphs to determine the effects of CO2 and H2O...but I prefer to go the long way i.e. spectral analysis for I find that the tolerance on the...

Hi, I've build a dynamic two-phase flow model (with heat-transfer) in order to simulate the process inside a "Main Steam Warming Line" for a power station. The aim of the exercise is to determine the characteristics of the throttling valve at the downstream side of the line. According to...

Hi, I want to build a model which is capable of calculating a combustion process in a coal fired boiler for a specific quality coal. I am new to the field however and want to know if anyone can give me advice on what phenomena is crucial to include and where I can find useful literature...

Hi everyone, I am looking for a supplier that could supply blocks of P91 or P92. It is needed for the manufacturing of large specialized (high pressure/temperature) control valve casings. The location of the supplier isn't crucial... Regards, Philip Oosthuizen Philip Oosthuizen Company info...

Dear All, I am in the process of designing puprging pipe work for a power station. The piping blows down to atmosphere and I need to calculate the thrust at the outlet of the pipe. I have an equation of the form Force = density * VolumeFlow^2 * (1/Area_outlet - 1/Area_inlet) The thing is...

Hi, I've been trying to find theory to calculate the pressure drop and heat transfer over a bank of tubes. I want to generate geometry specific friction and Colburn j factor charts (as in Kays & London). The best source I have is the VDI Wärmeatlas but I don't understand German. Is there...

Hi, I need to calculate the rate of heating of the main steam piping of a power station. However, in order to do it I need to find realistic pressure and temperature raising curves during cold startup. Do anyone know where I could get hold of such information?