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Recent content by ceprab

  1. ceprab

    Pressure vessels

    Hi Sam, Since you mention BS5500 please note that this document is no longer a BS document but is now a Published Document PD5500 with the standard being superseded by the PED regulations. Having said that, it is not uncommon to design to PD5500 as the old British Standard as it largely...
  2. ceprab

    PED TS Max for heat exchanger tubes

    I have a possible problem with a condenser I have on a current project. The Condenser is PED certified with notified body nameplate etc. The nameplate states Des. Temp. (Int/Ext)(TS Max) °C Shell Side 200 / 200 Tube side 80 / -- The problem I have is that in one case of coolant pump...
  3. ceprab

    Darby 3-K Method - impact of nominal diameter

    I have contacted Professor Darby to clarify the basis. The correlation is based on DN because that fits the data better, and goes down to 1/2" Schedule 40 pipe. As the fluid behaviour will be based on what the fluid 'sees' i.e. the I.D. AND on the dimensions of the fitting I am heading towards...
  4. ceprab

    Darby 3-K Method - impact of nominal diameter

    Hi bimr, Thanks for the link to a useful review. Unfortunately, the lower limit of that (1") is pretty much the upper limit of where my problems are - beyond that I am happy enough with the methods. As the table about halfway through that link shows, this size is where the 2K and 3K methods...
  5. ceprab

    Darby 3-K Method - impact of nominal diameter

    Hello All, I am working on line sizing for the purpose of putting together a guideline and I have been looking at Darby's 3-K method as the 'latest and greatest'. Working out if it makes a significant impact over the various other methods is separate to this question I want to ask here. The...
  6. ceprab

    Ground flare dispersion modelling

    Background: The project I am on is investigating the use of multi point ground flares (MPGF) for combusion of relief streams from cracker and aromatics units on a proposed chemical site. Maximum relief rates are of the order of 1000 tons per hour for emergency cases. Some cases include...
  7. ceprab

    Travelling Screen Head Loss

    rmw, What getting the vendor data told me was that the head loss I had allowed was very generous. I had allowed for 1 m (being conservative) for the trash rack and screen based on comments I had seen in a couple of (old) texts and a dose of caution due to wanting 3mm mesh size. The data...
  8. ceprab

    Travelling Screen Head Loss

    Thanks Latexman, bimr. I found the Perry's section but wasn't sure how well it would apply to flow in open channels. I have managed to get through to a manufacturer. Learning is to avoid the corporate sales line if it doesn't respond fast enough and ring up until you get a response. I have...
  9. ceprab

    Travelling Screen Head Loss

    I am working on sizing a seawater intake sump. Design of teh sump itself according to HI standards has been systematic, but I have drawn a blank on the anticipated head loss across the travelling screen. I have proposed two dual flow screens for the duty (28000 m3/h ) and I am hoping for a...
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