Anti Surge Control Valves - Which Style is Best?
Anti Surge Control Valves - Which Style is Best?
(OP)
I am relative new to the industry and I am trying to get a better understanding of Anti-Surge Control Valve applications, specifically for natural gas compressor stations.
I am trying to get a better understanding of the benefits of utilizing different valve styles in this application (globe vs. ball vs. axial) Is one style really better than the other and why? They all same to have the capability to meet closing and noise requirements with the correct actuation, instrumentation and internal trim, but why one style versus the other?
I am trying to get a better understanding of the benefits of utilizing different valve styles in this application (globe vs. ball vs. axial) Is one style really better than the other and why? They all same to have the capability to meet closing and noise requirements with the correct actuation, instrumentation and internal trim, but why one style versus the other?





RE: Anti Surge Control Valves - Which Style is Best?
globe valves are acceptable . . . then again, it depends upon process operating parameters (i.e. flow and dP requirements). the mfg compressor curves are what is needed to determine ASV. Fisher, Valtek, Masonelian, etc.are a reputable mfg's of ASVs with various trims available to meet the requirements.
the more important criteria are actuator, flow measurement device (location too!), and valve response times.
good luck!
-pmover
RE: Anti Surge Control Valves - Which Style is Best?
RE: Anti Surge Control Valves - Which Style is Best?
I completely understand that any type of control valve selection is based on application and process conditions. However when selecting between Emerson, Neles and CCI what are the determining factors? With each valve style there are unique features and benefits. I would think the following for this particular application:
Globe (such as CCI)
-Generally Higher Noise Attenuation (when compared to other valve styles)
-Linear motion provides short strokes (so faster closing time????)
Rotary Ball (such as Neles)
-High turn down so the ball style valve is able to maintain control during all operating conditions (max flow during surge or min flow start up)
-Higher capacity size for size compared to globe valves, reducing the compressor stations footprint
I'm not too sure when axial style fall into the mix.
I guess my question is, besides the process conditions what tips the scale on what valve style to use? Is it always noise? (If a compressor is already operating at 105 dBa, how important is an ASV's noise attenuation, when it is only in control during a surge) Does the compressor style (centrifugal or axial) influence the valve style decision?
RE: Anti Surge Control Valves - Which Style is Best?
I think control during surge would be more important.
I doubt that the difference in valve style or size will affect the size of the compressor station's footprint.
RE: Anti Surge Control Valves - Which Style is Best?
Both the recent CCI and Metso Neles ball valve applications were applied to existing units with very high actual noise in operation (not noise prediction). The CCI valve was used because the existing valve was breaking pipe supports. pipe, etc. More complex treatment is required as the noise approaches 100 dB. Above about 108 dB the noise may cause mechanical damage. Above about 114 dB the damage is severe. These are throw-down levels. I don't have any scientific data that shows 107 to be OK and 108 to be bad. However the reality is that data far in excess of 100 dB breaks stuff - an unpleasant thing to happen in an ethylene unit.
RE: Anti Surge Control Valves - Which Style is Best?
RE: Anti Surge Control Valves - Which Style is Best?
Globe valve is just the opposite. Fast response. Fine, accurate control, but bigger, heavier, and more expensive.