Recent content by Leclerc

CJKruger, what you appear to imply, is that, within the codes, there is no such thing as "allowable over temperature". thank you.

[I have posted this in the API Codes Forum a few days ago, but no bites, yet] As I understand, within the vessel Codes there is an allowable accumulation ( say 10%) which may be applied to design pressure/ MAWP. Also, where relief valve set pressure is set at this design pressure/ MAWP and...

As I understand, within the vessel Codes there is an allowable accumulation ( say 10%) which may be applied to design pressure/ MAWP. Also, where relief valve set pressure is set at this design pressure/ MAWP and there is overpressure of, say, 110% of set pressure, the valve relieving pressure...

On a steam locomotive, how does the boiler feed water injector work, when the only motive steam available is that from the boiler itself, which is at the same pressure to which the injector must raise BFW? And how show on a Mollier diagram? I understood that, using steam ejector reasoning...

what is in this geothermal slip water? I have known massive corrosion rate increase when ppm concentration of sulphides are present.

Consider a vent stack tip arrangement as follows: A larger diameter end section of some length fits over the tip and is fixed and located concentrically with the vent by at least three space bars to leave an annular space between vent stack and new tip. Any rainfall that is not exactly vertical...

By-product liquor will produce contaminated A/S crystals, especially colour, organic content, but also, possibly specific toxic and/or pathogenic compounds. Scope for some creative marketing! That said, A/S crystals are relatively easy to de-water, and a single-stage centrifuge could easily be...

I need to estimate mechanical seal flow requirements for a project's worth of centrifugal pumps, so that, with an applied margin, I can specify seal water circulation pumps, pumping tanks, line sizes, etc., etc.. I have some estimates from a previous plant plant design, but that plant is about...

I mention vertical velocity because the reboiler has a short, fat tube bundle, with dia about 3m and tube length 7m. The reboiler shell is about 5 m dia, thus liquid surface area is approx 5m x less than 7m: nearly square.

Dear All, There is a process condenser which generates steam in a kettle-type boiler. What should the (average)vertical velocity of generated steam be so that a normally accepted level of disentrainment is achieved? What should the velocity be for flowsheet, and what should be the maximum...

Thanks, Gents for your replies and advice. As usual, most things which at first appear to be coincidence, later on are proved not to be so. Leclerc.

to Latexman: I make a typo: both tempeatures should be 39 deg. C. to Stonecold: My physprops package calculates the vapour pressure of acetic acid as 0.045 bar at 39 deg. C, which could give me 0.045/1.013x100=4.44%v/v acetic acid in air; similar to your figure. However, my physprops package...

When flammability limits for, for example, acetic acid, are published, they are, as usual, quoted as % v/v. I assume that the v/v approach is used because it is dilution which limits flammability by failing to sustain burning, rather than something based upon stoichiometric considerations. I...

Current plant design is a single 60"NB inert offgas line (mainly nitrogen and water vapour as a result of desuperheating to an operating pressure/temperature of 1.1 bara/ 50 deg.C) to a single branch inlet to the final offgas scrubber (caustic solution) before discharge to atmosphere. Design...

My thanks to all for their comments so far. I did know that, in the absence of any particularly difficult problems arising, it is better to have a safety system fail safe (air fail open), as 'Homayun' and '1969grad' reminded me.I just wanted to air the general problem again and see what...