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Never mind. I just realized the m is being used to abbreviate a methyl group. I knew it was something simple I just couldn't think of; posting made the penny finally drop. Thanks anyways!

I have never used Hysys. I am attempting to decode a material balance generated with Hysys, however, and some of the chemical names are throwing me a little. What is 22-mbutane? How about 23-mbutane? This is probably just something simple. I know butane itself only has two isomers, and I've...

I'm very glad to have read through this topic, since days like this have happened to me, also. The thing I love about the job is the constant challenge, even when I'm figuratively chewing my nails to the wrists over some technical point of disagreement with other engineers. Even at the worst of...

Should I get a masters degree to tack onto a B.S.? A masters in Industrial Hygiene is available very locally, about 7 miles from my home - and an MBA or a masters in Chemical Engineering is available further away, toward downtown Houston from UH. I'm a chemical engineer who has worked in...

Montemayor: I am a chemical engineer by training, but I would not criticize you for rendering me assistance and advice. I just got ahead of myself a bit. I've only put in about 18 years thus far, and most of that in semiconductor or other industries, thus my questions. I agree, it is a...

I should have been more specific about my role, I suppose, Montemayor; I didn't realize there was a great deal of variation in the possible answers to my question. I am not a petrochemical engineer employed at a plant; I am a third-party firm hired to do LDAR only - except that just now my...

I believe so - I just wasn't sure it was still called a bonnet for a PRV, like a more common valve.

In a petrochemical plant I'm working at, there are a number of vessels topped with PRVs. Besides the main relief line, the top of the PRV also has a small elbow fitting, usually pointed downward, usually bigger at the exit than the connection to the body of the valve. What is this piece for or...

I'm coming around to your solution. Even though it will require months of number-crunching, doing that rather than individuall bagging and trying to measure leak rates in the field sounds both safer and less labor-intensive. Plus, as you've taken the time to point out, the bag and measure...

That's what I thought, but some lines are at a rather high temperature, and the leaking gas is combustible. I'd rather not have anyone get hurt trying this, so I'm just trying to see if there is a better way. If there isn't a safer and cheaper way, I'll have to advise the expensive instrument.

I looked - reference figures for standard loss rates will be helpful for other US sites, but this one is foreign and in particularly bad shape. I need some form of monitoring analyzer to get actual field leak rates to show them how much money is being lost in the leakage.

MBeychok: Thank you for that reference, but the site I am dealing with is in a foreign country. I'm being asked to provide empirical leak rates because this particular facility's equipment is (unfortunately) in quite a bit worse shape. I fear these figures would not adequately represent the...

Is there an instrument for quantifying in the field the actual rate loss of all individual components? I have this possibility, but this analyzer is very expensive: http://www.heathus.com/specs/hiflowsampler.pdf Anyone know of a better way to put objective, money-lost numbers to leakage rates...

I've done the keyword search; no dice. What I need is the 1) safest, and 2) cheapest way to determine the actual volume over time from fugitive emission sources such as valves, PRVs, flanges, et al in the field with an intrinsically safe instrument. So far, the only thing I've found near what I...