Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations TugboatEng on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Search results for query: *

  • Users: ddkm
  • Content: Threads
  • Order by date
  1. ddkm

    Comparing STEAM energy and energy loss

    How do we compare the energy levels between steam at two different pressures? Assumption is saturated steam. Example: If I have two separate steam supply lines, one at 30 bar, and the other at 50 bar, both at the same flowrates and same pipe sizing. Both are NON-insulated, and assuming I only...
  2. ddkm

    Calculate Total Head

    This is a very fundamental question which I'm having a tough time explaining to a colleague. Maybe you guys can help. Question: What is the total static head in the following piping layout? To me, the obvious answer is: Total Static Head = 30m -24m = 6m regardless of all the bends and...
  3. ddkm

    Operating at extreme left end of Pump Curve

    I have a Centrifugal Pump designed for about 12m3/hr (from purchase information with the supplier). The pump curve is without efficiency lines and as follows: We are however, running the pump at only 3.5 m3/hr maximum, which based on the above, means it's not even on the curve. Although I...
  4. ddkm

    What is this structure called?

    Hi all, is there a "professional" term for the following structure: It is used as a support to hold certain loads (parts of heavy equipment etc) after they have been dismantled. It's just a temporary support while waiting for the maintenance work to be carried out. The red part is the main...
  5. ddkm

    Biodiesel Physical and Chemical Reaction

    Recently, there is a trend towards more usage of biodiesel as alternative fuels in place of (or as a mixture to) the traditional petroleum diesels. With petroleum diesel, the reaction going on in the engine is some form of "burning" under high pressure (compression) and temperature. This burning...
  6. ddkm

    Difference between Economically Feasible and Financially Feasible

    This may seem like a trivial question. On second thoughts, it probably is. And inane too. But in your opinion, what is the difference between these two phrases "Economically Feasible" and "Financially Feasible"? Or, stuff it & whocares! there's no difference at all? Obviously I have my views...
  7. ddkm

    Insulation- Question on Cladding

    In a thermal insulation system, we normally use Aluminium cladding to protect. When installing the cladding, are there any requirements or standards on which type of securing method to use? I prefer screw type instead of rivet, as I believe the maintenance fitters can fix them back more easily...
  8. ddkm

    Codes or Nomenclature for Stainless Steel????

    I know most of you here refer to the UNS codes, but my suppliers normally use a different nomenclature. Examples are 1.4408, 1.4571, 1.4581 etc. Where can I get a full listing or table which describes ALL these nomenclature and match it back to UNS or whatever else codes available in the market...
  9. ddkm

    Calculation for steam tracing requirement

    We intend to install steam tracing on a pump for the purposes of maintaining a certain temperature, which enables the fluid in the pump to remain in liquid form. What are the considerations for doing the heat transfer calculations for the required steam tracing? My view is as follows: - Volume...
  10. ddkm

    Non-return Valve Selection

    What are the key criteria for selection of a non-return valve for the use in a high pressure liquid stream (>45 bar)? ---engineering your life---
  11. ddkm

    Pressure Drop - how do you "guess" the value?

    We are planning to construct a pipe for overflow (at a given flowrate). As such, we need to determine the minimum diameter for this pipe to cater for this overflow. Looking at the calculation: Diameter D = Unknown (to be determined) Velocity u = Unknown and Pressure Drop is required input to...
  12. ddkm

    "Normal" m3 (volume) for a gas?

    Given a known quantity of gas, say in kg, how do we convert this to "Normal m3"? I'm quite sure I know this, but just wanted confirmation from you guys. ----------------------- My take on this is as follows, rightly or wrongly: Using Ideal Gas Law PV=nRT: we have PV=mRT/M where m =...
  13. ddkm

    Heat Capacity of Caustic Solution (50%)

    Anyone know the Heat Capacity of Caustic Solution at about 48-50% concentration? Temperature is about 60-70ºC. Thanks. ---engineering your life---
  14. ddkm

    Standard Symbols/Drawing for Valves, Pumps, Instruments etc

    Can anyone point me to a website which lists down the standard symbols or icons used in a P&ID for equipment and instruments in a process plant. Example valves (various types), pumps, controllers, etc. ---engineering your life---
  15. ddkm

    Sizing orifice (LIQUID)

    Sorry to those who may feel a sense of dejavu. But I do have some questions regarding sizing of orifices for LIQUIDS. Of course, we already have a good solid discussion on the similar topic here Thread: Flow of VAPOR thru a hole , but I didn't want to clog up the thread, so I've created a new...
  16. ddkm

    Sizing of orifice?

    Hello all. I'm a newbie here, searching for opinions on orifice sizing. For a vapor through a hole (in this case, saturated steam), I was recommended the following equation (from Crowl/Louvar): Qm (choked) = Co A Po SQRT{(k gc M / Rg To)*(2/k+1)^[(k+1)/(k-1)]} (Equation is provided in the...

Part and Inventory Search

Back
Top