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  1. PhilOos

    Helical Baffle Heat Transfer

    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...
  2. PhilOos

    Explosive Welding (Tubes to Tubesheet)

    Thanks for the replies... I know TEi very well, they do the actual explosive welding and I'm doing the heat exchanger design. The problem is, I need to show ligament stress calculations to get my design approved by the third party, but can't find a way / code to calculate it (without having to...
  3. PhilOos

    Explosive Welding (Tubes to Tubesheet)

    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...
  4. PhilOos

    Ligament Efficiency for Explosive Welding

    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...
  5. PhilOos

    Positive Displacement Pumps in Series

    Hi katmar, The actual question that I've asked was: Why do two PD pumps in series (coupled directly after each other) have a different characteristic than two systems in series (each system with its own PD pump)? Reading through all the replies I've managed to figure it out... Regarding the...
  6. PhilOos

    Positive Displacement Pumps in Series

    Hi BigInch, The flowrate I'm looking at is about 840 liters/min (+-30 ft3/min). Thanks for all the replies, I've gained a lot of insight into the problem. Kind regards Philip Oosthuizen Company info: SteinMuller Engineering Services http://www.steinmuller.co.za/
  7. PhilOos

    Positive Displacement Pumps in Series

    Hi BigInch, The reticulation system consists mostly of 4" pipes and the overall length is about 900 ft. I use the same oil throughout the system (Bunker 150), it is only the temperature of the oil that varies. For the low pressure side, the oil temperature is about 83ºC (182 ºF), Oil...
  8. PhilOos

    Positive Displacement Pumps in Series

    Hi all, I've looked at two ways to couple two PD pumps in series. (a) two pumps installed directly after each other. (b) two pumps installed about 75 meters apart. (see picture). For a given restriction (causing a back pressure of 38 bar). For configuration (a), both pumps share the...
  9. PhilOos

    Positive Displacement Pumps in Series

    Hi all, Thank you for the response. I'm looking at a fuel oil system that has a low pressure pump house (to draw oil from the tanks, with a outlet pressure of 470kPa) and a high pressure pump house (supplies oil burners with oil at 38bar). Between the two pump houses are a pressure regulating...
  10. PhilOos

    Positive Displacement Pumps in Series

    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...
  11. PhilOos

    choked flow pressure drop

    A quick solution to your problem... The pressure ratio (Downstream Pressure / Upstream Pressure)of a choked flow condition is almost equal to 0.5. You may try to test this by plotting a Fanno line graph and asses what the pressure ratio is at the maximum value of the curve. In plotting the...
  12. PhilOos

    Swirler pressure drop (PF Burner)?

    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...
  13. PhilOos

    Flue Gas pressure drop

    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...
  14. PhilOos

    Flow Nozzel Pressure Drop

    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 @...
  15. PhilOos

    Pipeline Surge Software

    I would recommend Flownex created by M-Tech Industrial. I've used Flowmaster, RELAP, COBRA, FLUENT, etc. I must say that for system analysis, Flownex is far more superior than any of the software I've ever used. It is extremely fast, stable and complete. I can do real complex piping designs in...
  16. PhilOos

    Liquid Hold-up

    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...
  17. PhilOos

    Problem with Economiser service

    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...
  18. PhilOos

    Labyrinth Seal leak flow

    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/
  19. PhilOos

    Gas Radiation

    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...
  20. PhilOos

    Condensation and Temperature Rate of Change

    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...

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