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  1. ddkm

    Comparing STEAM energy and energy loss

    25362, spot on. Obviously, my example is bordering on fictitious, but I chose it so that we have a similar basis to compare. Bottom-line is, why is there an apparent "contradiction" in terms of the Enthalpy of the steam (vapor)? For the rest of the replies, thanks for the quick responses. I'll...
  2. 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...
  3. ddkm

    What is this structure called?

    So, now we have: - Horse - Sawhorse - Trestle (sounds professional) or tressel - A frame Support - Gantry crane or gantry support - Swingset - Equipment stand Hmm...choices, choices... Regards, DD ---engineering your life---
  4. ddkm

    Operating at extreme left end of Pump Curve

    We managed to contact the pump manufacturer today (it's a darn old pump...), and based on their reply, the minimum allowable flow is actually 7m3/hr for the heads of 30-40m (as per design). OK, that much is clear, i.e. we shouldn't be running at the low flowrates. What I still don't understand...
  5. ddkm

    Operating at extreme left end of Pump Curve

    The gauge is at the pump discharge but before the throttling valve controlling the flow to a max of 3.5m3/hr. Refer this diagram: http://i76.photobucket.com/albums/j24/dd_km/Gauge.jpg Quark, could you elaborate more on the hunting part? Unless you mean that the curve becomes a Steep Drooping...
  6. ddkm

    Operating at extreme left end of Pump Curve

    To update this: I ran the pump yesterday and found that the pressure at the pump discharge (local gauge) showed only about 1.3bar which equates to about 15m Head (based on the fluid density of 900kg/m3). Based on the Total Static Head plus all the Friction Losses in the rather long pipeline, my...
  7. ddkm

    Operating at extreme left end of Pump Curve

    Artisi, you are right about the pump power. It's rated at 4.4kW. However, I have left out an important point earlier. For most of the time, this pump runs at below 3.5m3/hr, but around once every two days, it is required (preferred) to run 8-10m3/hr for a short period of about 1 hour. (For a...
  8. ddkm

    Calculate Total Head

    Exactly my thinking. And in fact, the line will always fill up to the minimum level in the tank before the pump is allowed to start. Yes, your points were already considered because: TOTAL Static Head = (Discharge Static Head) - (Suction Static Head) = 30m - 24m = 6m The...
  9. ddkm

    Operating at extreme left end of Pump Curve

    BigInch, If VSD's not suitable, what about installing a Recirculation line at the pump itself which will increase the total flow through the pump? Any comments about how easy to do this? ---engineering your life---
  10. ddkm

    Calculate Total Head

    BigInch, agreed on all points. Also, abt your comment about tank being empty, this will be unlikely as there will be an auto cutoff once the tank reach low-level. ---engineering your life---
  11. 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...
  12. ddkm

    Operating at extreme left end of Pump Curve

    Artisi, as I mentioned earlier, there's a flowmeter and control valve installed on the pump discharge side. The flow is controlled to a maximum of 3.5m3/hr. Application is for oils with normal viscosities, less than 25cP. At the moment, there are no gauges installed on the suction and discharge...
  13. ddkm

    Operating at extreme left end of Pump Curve

    quark, there's a flowmeter installed and in fact, the flow is controlled to a maximum of 3.5m3/hr on the pump discharge side. I've not completed the review of the head required, but yes, it appears that this pump is for a high static head application. Minimum looks like 20m of head, not yet...
  14. 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...
  15. ddkm

    What is this structure called?

    Wow, there's actually a forum section on Engineering Language? Cool! Guess I should have used that in the first place, huh? My bad! ---engineering your life---
  16. ddkm

    What is this structure called?

    But guys, it's not for sawing! So, now I'm undecided between: - Horse - Sawhorse - Trestle (sounds professional) - A frame Support ---engineering your life---
  17. ddkm

    What is this structure called?

    corus, not sure if you were joking, but I was also thinking along the same lines. To be precise, "Support Horse". But then, wasn't sure how ridiculous it would sound. That's why I'm looking at what others would say, or if there would already be an "official" name for it. ---engineering your...
  18. 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...
  19. ddkm

    Biodiesel Physical and Chemical Reaction

    owg, in a way, I'm also wondering why the biodiesel can burn better. What are the similar chemical structures between biodiesel and its petroleum cousin? Also, could you elaborate more what happens to the carbon outside of the engine? Thanks. ---engineering your life---
  20. ddkm

    Biodiesel Physical and Chemical Reaction

    25362, thanks for the links. But I had already checked Wiki earlier and they don't mention about how the biodiesel itself is being reacted/converted to produce the power. They focus more on the manufacture of biodiesel. And the other link you provided only talks about the experiments and...

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