Recent content by BHMech

Fred, This is excellent information. We have access to a variety of equipment through contacts at a local university. I shall keep you posted.

I am working for the valve manufacturer and I wish to validate our noise prediction calculations. We already have predictions based on IEC 534-8-1, and based on test values gained from similar equipment in semi-anechoic chambers but these are based on air flow and were tested at lower...

Thanks Khan101 and GregLocock. These will bring me some way foraward. Bryan Hall

Thanks Khan101, I have this code, together with IEC-534-8-3 for predicting noise. Unfortunately IEC-534-8-2 is a lab test rather than a field test. I could adapt this but I prefer a procedure that is suited to the field.

Thanks Hacksaw, Can you give me any leads, references ?

No, leakage is not the issue. I need to measure noise in dB(A).

Does anyone have a procedure for the measurement of aerodynamic noise from valves. In particular, steam power processes. I'm looking for a field measurement test rather than a lab test. Thanks.

Flow coefficient Cv changes with shape and design of valve. Generally the relationship between area and Cv varies from 18 and 32 times the seat area in square inches. The lower numbers (18 to 26) apply when the seat area is large in comparison with the valve inlet and outlet areas. A simplified...

Im looking for a method of predicting the reduction in water droplet size with time due to evaporation. I'm trying to learn more about the mechanics behind desuperheating steam (adding atomised water to steam to control temperature). Any help in this area is appreciated.

Alternative to CCI Drag is Copes-Vulcan Raven Trim. These are less expensive, I can recommend an ex-CCI guy who now works for Copes if you like. They also have other trim designs that would suit your application.

Does anyone have any information on acceptable valve end loading due to piping stesses? We have customers who often ask for the allowable loads that valve ends can withstand. Or, is there any guidelines to show the expected load that a given pipe may exhort on a valve due to pressure or temperature?

John, the main issue is noise and vibration limits. special valve trims can be designed to cope with the noise and vibration inside the valve but not in the down stream pipe system. You might consider raising the downstream pressure somehow thereby reducing velocity. I would have to look at your...

Does anyone have any information on acceptable valve end loading due to piping stesses? We have customers who often ask for the allowable loads that valve ends can withstand. Alternatively, is there any guidelines to show the expected load that a given pipe may exhort on a valve due to pressure...

Ilan7, any thoughts on how you are going to tackle this one? Im interested in your solution because I work in steam power also.

You might want to have a read of this paper concerning ultrasonic flow meters for two phase flow. As discussed above, a coriolis flow meter might be an option also. This gives some insight. http://www.gepower.com/panametrics/en_us/pdf/papers/ur234.pdf