Zoon,
I usually see the flow coefficient for a valve represented by the symbol Cv, so I googled Kvs and found a decent link: http://www.eurotherm.com/products/valves/size_water.htm
This link states that Kvs is the metric equivalent of Cv. Specifically, the link states that Kvs is the flow...
BigInch: Thanks for the link. I downloaded the spreadsheet and am looking at it.
dicksewrrat: I have to double check, but I thought the culvert was corrugated steel pipe. The Ohio Dept of Transportation (ODOT) culvert design manual suggests n=.024 for 24" type A corrugated steel pipe. The...
Our concern is whether or not a 21” culvert will have sufficient capacity to prevent flooding of nearby property. I was trying to verify an engineering calculation and put together a bounding scenario for maximum culvert capacity, as follows:
1. Storm water flows freely through an open ditch...
Can the Manning equation be used for case where a pipe is running full of water?
For example, in open channel flow where the channel flow runs through a culvert pipe, if the conditions are such that the culvert pipe is running full, can the Manning equation still be used? Are there any...
A model presented at the following web site:
http://soilphysics.okstate.edu/toolkit/temperature/index0.html
will show the soil temperature variation as a function of depth. According to the model, the soil temperature is essentially constant beyond depths of 10 feet at a value equal to the...
kirsner,
Yes, the waterhammer occurs following pump initiation. The system operator tried a new procedure that involved throttling of a flow control valve to reduce the pumped flow rate. The pumped flow was reduced to 170 gpm into the 8” trap header. Even with this procedure in place, strong...
hndler,
Yes it is possible that condensation of steam on the colder water will cause a significant waterhammer event. There is a long and well documented history of condensation-induced waterhammer events. Although there are several classifications of condensation-induced waterhamemr events...
Katmar,
Based on what you said, the following scenario may be the source of steam.
Condensate from the steam traps flows into the trap header because the steam line is at a higher pressure than the trap header. Presumably, the condensate is at the saturation temperature of the higher pressure...
To all:
Here’s an update on our situation.
Unfortunately, during the last outage, the tests we had planned could not be performed. We were going to take temperature measurements along the pipe to see if there were any hot areas which could correspond to saturated fluid conditions. However...
Katmar,
Unfortunately, during the last outage, the tests we had planned could not be performed. We were going to take temperature measurements along the pipe to see if there were any hot areas which could correspond to saturated fluid conditions. However, this would have required the removal...
gator1991,
I performed a heat transfer calculation using 2.5 W/m2/C as suggested by 25362. My result: a heat flux of 13.8 W/m2 (nearly identical to 25362), or 16.8 W/m (17.5 Btu/hr/ft; 1048 Btu/hr over the 60 foot pipe length).
So, over the length of the 60 ft pipe, there would very little...
heaterguy,
Natural convection has a heating/cooling dependence which itself is dependent on the orientation of the metal surface.
I believe I can give you an answer if you can tell me whether the heater surface is vertical or horizontal. Same for the metal block (or perhaps the block has a...
