GenB, thank you for the reply. I was getting kind of lonely out here. LOL! I have learned much through this order, and since it is not complete I believe there will be more to learn. Basically a sales person needs to advise their customer, regardless if they want to or not, employ a "stamp...
Thank you Mr168 and glrsbmiqc, if I had a copy of the code I could look to the specific pages you reference. I looked at buying a copy of the code and it was $14K. This is more than the selling price of the valves and pipe spools combined.
I'm glad there wasn't a FM inspector around when the...
As a supplier I am conflicted between a FM inspector that says the piping from the 300# flanged steam drum outlet of the high pressure boiler to the flanged non-return valve, the flanged non-return valve, the flanged piping between the flanged non-return valve and the first flanged stop valve...
Many years ago EPRI did a study on why large diameter butterfly valves were cavitating in large supercritical power plant even though the equations indicated they shouldn't be cavitating. They found that the equation was based on the flow to square root of delta P curve of a globe valve. Choked...
Full ball type ball valves usually have two seats. Can you remove the valve, turn the valve body 180 degrees and reinstall it making the upstream seat now the downstream seat? It may save you the cost of the pipe modifications.
Please be sure the valve is bi-directional.
Wasn't the original leakage class standard developed for globe control valves which are unbalanced? Trying to hold a plug down on a seat ring to provide tightness as the differential get higher is tough. Do the math... This is why class five allows more leakage per more inches of diameter per...
Ball Valves versus Gates and Globes?
1) Rotating in the packing instead of reciprocating the process from within or the environment from the outside through the packing gland along with the stem.
2) Elimination of the bonnet gasket and potential leak path.
3) Sealing member rotates in it's own...
Here in Ohio where the outside temperature can go from 50 or 60F or hotter with sun load on the pipe to the 20s or 30s does not make plain thermoplastics a good choice. Cold temperature embrittlement is always a concern. Along with impact resistance and thermal expansion. And then there is the...
In the water industry they use CO2 to lower pH by injecting it in the water. If water is present in the fuel line could it form an acid? Carbonic?? CO2+H2O
Sircrashalot,
I think you are confusing the valve torque requirement charts which are given for valve size versus differential pressure, with valve torque profile which is the valve torque at different percentages of opening.
I would rather have my actuators oversized than undersized.
B2
I'm sure I know what you are asking. For turbulent non-compressible flow it would be Flow squared, times Specific gravity over Cv squared equals delta P.
For compressible flow you first have to determine the delta P to P1 ratio. Then Weight, Mass or Vapor basis and what kind of valve globe...
Tweedie,
Your conbination of swing check valve and then butterfly valve would warrant a call to the manufacturers for more specific dimensions on the check valve outlet and the distance of the BFV disc protuding into the upstream piping.
One thing I didn't see anyone mention is the valve...
OK here is my "out of the box" idea. At 200 nozzels it may well be out of the question finacially.
Recently I've read about an accustic sensor. Gases and fluids apparently generate an ultra sonic frequency through orifices. This instrument when bolted to the valve or steam trap or potentially...
Yes but that Hammel Dahl valve isn't so old anymore. Didn't Jamesbury pour all kinds of money in that product to develop one common body for post guided screwed in seat ring, post guided cage retained seat ring and cage guided cage retained seat ring allowing a user to significantly reduce their...
I know high volume compressor manufacturers are very concerned with surge. They have indicated that the "Smart" type transducers are great but slow because of the electronics. So they prefer "conventional" type transducers. They do not communicate through HART protocol, have to be zero and...
