Noise reduction in condensate outlet 1

[rivi]

Hi

In some instances we are forced to open the drain of our condensate header (comming from reboilers). The problem is that there is a lot of noise when we open the drain. The drain line is the same diameter as the header (3inch). The condensate is derived from 8 bar steam at 200 deg C. Because of the low frequecy of this occurance it is not cost effective to purchase an expensive silencer. Does anybody have any tips or modifications on how we can reduce the noise.

 

[lastone]

Build a quench station. Make a manifold with 2 or 3 3/4"- hose-connections. Screw or flange the manifold into your 3" drain, then hook 3 clarified water or utility hoses into the manifold. Open them up enough so that they are mixing with the condensate and cooling it so that the condensate won't flash violently when it leaves the pipe. Make sure your utility water connections don't overcome the condensate and prevent it from draining. Although this isn't ideal, it is better than having all of that steam flashing and making the noise. Don't forget to rope off the area. Make sure you do an MOC, and involve your inspectors and mechanical guys. And make sure this doesn't go on but a short time. Get that condensate back to the boiler!

 

[skoutso]

Aerodynamic and hydrodynamic noise depends on the mass flow. The higher is the quantity of flashed steam, the greater is the velocity at vena contracta, the higher is the resulting noise. Try intial slow and gradual depressuring through an 1" globe valve. If the condesate goes to the boiler, add an 1" by-pass around the 3" valve.