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...
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...
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---
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...
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...
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...
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...
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...
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---
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---
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...
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...
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...
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...
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---
