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  1. bif

    LPG Storage Options - Refrigerated or Pressurized

    I am looking for some background information as to advantages and disadvantages (technical and commercial) of refrigerated or pressurized storage (vessels and spheres) of LPG at a terminal. Typical storage quantity is 30,000 m3. Additionally, I'd also like to understand how choosing either...
  2. bif

    Electric Arc Furnace - Supplier

    I'm looking for suppliers of Electric Arc furnaces with capability of re-processing PGM's, mainly from automobile cats. Any advice?
  3. bif

    UK Climatic Conditions

    I am currently involved in transferring a plant design for Asia to the UK. As a starting point I would like to specify the typical climatic conditions for the UK. Does anyone know where I can find this data. Typically I need Temperatures max and min Atmospheric Conditions Rainfall Humidity...
  4. bif

    Cost of steam generation

    Its not the pounds I'm thining of. I want to be able to work out how much btu's or kwh's are required to generate 10 barg steam. Then I can use this to work out a 'cost of steam generation'
  5. bif

    Cost of steam generation

    I want to calculate the cost of raising steam from a natural gas fired boiler. If I have mains uninterruptasble natural gas at say 2 pence per KWh and a boiler that is 80% efficient how do I calculate the cost of raising 10 barg saturated steam? I think it will work out about £15 per te but I...
  6. bif

    Settling in Horizontal air stream

    If I have a 10 mm particle (assume spherical) with a density of 200 kg/m3, falling vertically under gravity into an horizontal airstream at 15 m/s in a duct of a known diameter,how do I calculate a) whether the particle will be carried in the airstream b) if the particle is not carried on the...
  7. bif

    Pressure Drop Systems in Parallel

    Just to clarify zdas04, This is a system under suction - like a dust extraction system. I am looking at 1 fan in the common part of the system and then splitting the upstream flow accross 5'units' in parellel. The plan is to crerate equal pd and hence flow through each common unit. The way Big...
  8. bif

    Pressure Drop Systems in Parallel

    Thanks Big Inch, It was the principal I needed to clarify. That means its my 20 mbarg at 5000 mbar, which is my greatest drop at the split, plus my pressure drop in the pipework at 25000 m3/hr. Thanks again
  9. bif

    Pressure Drop Systems in Parallel

    I currently have an system that moves air and dust that is rated at 5000 m3/hr and the pressure drop through the sysem is measured at 20 m/barg. I need to extend the system so that 5 of the 'units' above all operate in parrallel, all tying together just before a new fan that I need to specify...
  10. bif

    Positive or Negative Pressure Filtration

    I am looking at installing a new dust conveying and filtration system as part of a plant expansion. The unit we currently have uses positve pressure filtration to remove the dust fines (cyclone to remove most of the particles, then a fan blowing any entrained dust into cloth filter bags). My...
  11. bif

    Pressure and Flow Measurement

    I have a system which conveys powder in an air stream. The air is conveyed by a fan in the middle of the system The system goes through a number of unit stages and pipework. I need to develop a number of system curve and understand the pressure profiles and velocity through the system on...
  12. bif

    25% Aqueos Ammonia Storage Tank

    can anyone point me in the direction of any 'Best Available Techniques (BAT)' for the UK I'm looking at designing a small (~40 m³) storage tank to recieve road tanker deliveries of 25% Aqeous Ammonia in the UK Currently the design is for an atmospheric tank with an assoicated scrubber - where...
  13. bif

    Vent Header Isolation and Diversion

    I currently have a relief vent header (potentially containing a flammable gas stream) that is routed to a scrubbing system and subsequent downstream processing. Under certain circumstances (ie loss of scrubber water flow) there is a requirment to 'bypass' the scrubber and downstream processing...
  14. bif

    Method for Sizing and Overflow on an Atmospheric Tank

    Apologies, I've got my decimal place in the wrong place! The overflow size should read 0.8 m rather than 0.08 m as I stated earlier
  15. bif

    Method for Sizing and Overflow on an Atmospheric Tank

    Is there an accepted/recommended method for sizing an overflow for an atmospheric tank where an independent vent line is also incorporated The tank I am looking at contains hot water and has an independent vent line coming off the top. It also has an overflow set ~ 0.5 m from tan line coming...
  16. bif

    Point of free discharge

    I have a a scenario where I have to pump up 30m vertically from a datum level to get over a building. The pipe is then ran back to ground level where it discharges atmospherically into an open pit. The discharge point is pretty much at the datum level. My understanding of static discharge head...
  17. bif

    Ethanol LEL/HEL data

    I am looking for Low and High explosivity limits (% v/v) for ethanol in environments other than air. Specifically I am looking at how increasing the CO2 concentration within a vessel could mitigate the risk of a potential explosive environment, by reducing the oxygen to below a point where it...
  18. bif

    Beer Foam Density

    I am looking for some references for densities of beer foam. I know it can vary, so a range of values would be good enough
  19. bif

    Pump Shut off head/Vertical lift

    Thanks guys The pump does require 1m, but it would appear as though there can be up to 12 m available as best/worse case for the application in question (ie storage tank full) I'll take the total discharge head as the sum of the differential + suction head for the problem I am looking at.
  20. bif

    Pump Shut off head/Vertical lift

    I have a pump datasheet quoting a 50 m shut off head. The NPSHr is 1m and there is 10m available - both quoted on the datasheet. Is the vertical lift from the pump 50m, or do I need to add the NPSH availble?

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