Feeding Pumps – the Suction Lift in Steam Systems December 5, 2007
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Feeding Pumps – the Suction Lift in Steam Systems
The danger of impeller cavitations increases with water temperature
To avoid cavitations in a feeding pump the suction lift and pressure head
should not exceed the limits below:
| Temperature of Feeding Water | Max Suction Lift | Minimum Pressure Head | |||
| (oC) | (oF) | (m) | (ft) | (m) | (ft) |
| 55 | 130 | 3 | 10 | ||
| 65 | 150 | 2 | 7 | ||
| 77 | 170 | 0.6 | 2 | ||
| 80 | 175 | 0 | 0 | 0 | 0 |
| 87 | 190 | 1.5 | 5 | ||
| 95 | 200 | 3.5 | 10 | ||
| 99 | 210 | 4.5 | 15 | ||
| 100 | 212 | 5 | 17 | ||
For water with temperature above 80oC (175oF) its necessary with a positive pressure head – and the pump is located in
an elevation below the water or condensate receiver.
In steam distribution systems its common with open vented condensate receivers with temperatures close to 100oC (212oF).
This is true especially in systems where most of the steam consumed is returned as
href=”http://www.engineeringtoolbox.com/flash-steam-generation-d_425.html“>hot condensate, but also in systems where the make up water is
heated to reduce the amount of air dissolved in the water.
- Recommended Suction Flow Velocity for
Boiling Fluids – Recommended flow velocity for the pump suction side. - Recommended Delivery Flow Velocity for
Boiling Liquids – Flow velocity normally required on the delivery side of the pump in systems with boiling liquids.
tes October 23, 2007
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musi fyhsy fyhyb yb . uhygyg ygyg y gyg yy gy uhuh Juh uhsuf
Color Codes October 9, 2007
Posted by infokito™ in Reference.Tags: code, color
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When you’re adding a color to your Web page with HTML, sometimes you can just type in the name of the color. But more often than not, you’ll need to use what’s called the hex code, which is something that the browser will be able to understand. Choose a color from the list below and look to its left to get the hex code. If we wanted our background to be red, for example, we’d type bgcolor=”#FF0000″. Try it out!
If you’d like to print this chart and you are using Internet Explorer, click on “Tools” and then “Advanced.” Next, scroll down to “Printing” and make sure the “Print background colors and images” box is checked.
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Halo dunia! October 9, 2007
Posted by infokito™ in Tidak terkategori.1 comment so far
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