tube material is selected based on the water conditions and the expected fouling/corrosion.
copper tubes are best for coolers if the water is not prone for high corrosion or fouling.
next step up in corrosion resistance is generally the 90/10 tubes and that should provide most users sufficient...
there isn't a way to control water content or "dewpoint" to any meaningful way in this screw compressor unless you are cooling and reheating the discharge air.
even if the discharge temperature of the compressor were kept high enough to be above the dewpoint, you still have a bunch of water in...
API-614 advises that for pipe threads used on systems with hazardous fluids over 75psig operating pressure, all threads shall be seal welded.
sound advice is to use flanged thermowells for piping containing flammable gas or toxic gas. if you use a threaded thermowell, i would seal weld it...
the control system may have been working properly and attempted to open blow off valve when the compressor reached the surge line, but the valve may not have opened due to being stuck. you would have to look at the history data (if available) to see if the signal was given to the valve at the...
if both compressors are connected to the same discharge header, the maximum discharge pressure in that header is limited to what the lower pressure rated compressor can reach (27kg/cm2). the other compressor with a higher discharge pressure must operate at its normal design pressure (or close...
RotaryW,
API-617 would suggest that the OEM tests all auxilary equipment during the mechanical test of the compressor. the Fact is that this is rarely done. in the description of the test procedure which has been given to the customer, it is usually described what equipment is and what isn't...
inlet throttling using a pressure reduction device like a butterfly valve will of course throttle the compressor effectively. however, it gives up efficiency for cost. an inlet guide vane will first throttle the compressor by pre-swirling the air/gas to the first stage. this effectively...
the air cooled centrifugal compressor that I am familiar with will operate reliably in ambient temperatures of 105-110F. the after cooler is in most cases, a 10degree approach cooler. this compressor is integrally geared. it will have longer life cycle than dry screw, higher efficiency, and...
I have designed many compressors with shaft mounted main oil pumps. I re-designed a number of them with better couplings since that was one of the failure points.
an electric motor driven aux pump will allow the compressor to start up with full oil pressure and will allow the compressor to...
a simple way to run two centrifugals in parallel:
set one machine with a pressure set point approximately 5psig higher than the other machine. the unit with the higher set point will eventually be running full out, trying to reach the higher pressure set point. the other machine will be...
I have personal use with a bunch of flat head screws in high vibration application. if the fastener is not loctited, they will come loose.
In my proffession, it has been used, with success, peening of the fastener to lock it in place. a punch is used and the very edge of the fastener is...
then you should remove that check valve. it is not needed. the recycle line should only contain the recycle valve and in many cases, a diffuser or silencer to reduce the noise level of the valve during operation. the requirement of the silencer is usually dictated by the vendor supplying the...
MortenA, what you are describing is a discharge check valve. And you are correct, that check valve is needed and has always been installed in the final discharge line from a centrifugal compressor.
however, the literal meaning of "check valve downstream of the recycle valve" means to me...
I have never put a check valve downstream of a recycle valve in 25 years of designing centrifugal compressors. it is not needed.
if you want to provide more detail on the actual arrangement of piping and the process, maybe there something strange with your installation than can be assumed...
alarm on primary seal flow supply. whether to also have a trip on low low supply is up to the user and the process criticality.
secondary seal also has to have protection. supply flow meter on N2 supply to secondary seal. flow meter on primary vent. compare the two values in the controls...
