Hello, I would like to get feedback on the best way to approach a new unit start up with regard to a test run for Operations sign off. Would I simply be looking for design target rates at product specification? Anything else that should be examined, such as under sized control valves? I would...
Hello, I would like to inquire on the best (cheapest) way to reduce ~2,500 ppm H2S to 50-100 ppm. The gas is flare header, and so is low pressure (1.5 psig). I have only seen amine applications in higher pressure systems. Can amine be used in low pressure also? How would you regenerate the rich...
Hello, I am not familiar with mechanical seals, so I apologize for my simple question.
What is the purpose of the vent lines in dual seals and gas seals? Must these seals vent continuously to flare? How much flow would be expected for a typical vent design?
Thank you,
Hello,
I have a PSV set at vessel MAWP of 20 psig. API recommends the inlet pipe to the PSV not have a pressure loss greater than 3% of set pressure at valve capacity. However, this is only 0.6 psi. ASME allows an overpressure of 10% for vessels with MAWP greater than or equal to 30 psig and 3...
Yes, I apologize for my confusion. I am asking about detonation arrestors as I understand flame arrestors are only for end of line applications, i.e. not in between a process and a flare as is the case for my application.
Thanks,
Hello,
Does any one know of any theoretical equation for calculating the max possible discharge pressure or compression ratio of a liquid ring compressor?
Since LRs are positive displacement machines, when does the pressure increase stop?
Any references would be great!
Thanks,
Hello,
I am new to the subject of flame arrestors, and am in need of some fundamental help.
If a gaseous mixture to a flare is not classified as flammable, then is a flame arrestor required? Is flashback only a concern for flammable mixtures? My stream is composed primarily of Nitric Oxide...
Hello,
I am evaluating the adequacy of an existing flame arrestor and need to understand how to calculate the flashback velocity. How does pipe length and fittings impact the velocity?
I suppose it is the flashback velocity that I should check the pressure drop against on my FA capacity...
Hello,
I need to determine whether a 275 psig steam drum will require a vortex breaker at its bottom nozzle that goes to the suction of a pump. I have a 12" outlet nozzle and suction line to the pump. The flow rate is 1,600 gpm. Liquid level in the drum is about 5 ft above the bottome nozzle...
Hello,
I am looking into potential energy savings on retrofitting an A/C motor with a VFD. The machine is a positive displacement, SIHI, liquid ring compressor. The performance curve I have is a bit confusing to me. Typically, I see centrifugal type machines as having the required power...
Hello,
I have a 265 psig steam/condensate line return from a heat exchanger back to a flash steam drum. It is about 5 wt% vapor/95 wt% liquid, and 80 vol% vapor/20 vol% liquid. Liquid velocity is 3.5 ft/sec; steam velocity is 15 ft/sec.
We are experiencing slug flow as evidenced by regular...
Hello,
I have gone out for bids on 2 different exchangers, one is condensing on the shell side and the other vaporizing on the shell side. One exchanger manufacturer has recommended to use a 60 degree tube layout. They say that this reduces the possibility of vibration in the exchanger. This is...
katmar,
I was referring more to different orifice sizes within a trap of the same body size, say a 2" trap. If, for that 2" trap, I have a choice of several orifices with discharge capacities ranging from 400 lb/hr to 2,500 lb/hr for a differential at 250 psi, and I calculate a condensate load...
Our site has been moving towards free float traps. I have seen a fair amount of inverted bucket traps as well from older installations.
I am specifying traps for steam tracing as well as drip lines in steam mains.
Any help would be great. Thanks,
Hello,
I am pondering the consequence of oversizing a steam trap. I can understand why an undersized steam trap would be problematic, i.e. backing condensate into your steam header. But what would an oversized trap do? Release steam?
Any light shed on this subject would be appreciated.
