API 521, 7.2.2
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"Each pressure-relief device that vents directly to the atmosphere should normally have an individual vent pipe sized for a relatively high exit velocity; however, the outlet piping should not be smaller than the pressure-relief-device outlet."
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From the language, it...
I opened my letter standing right in the middle of the street because that's where I was when I saw that it had arrived. It didn't matter what was coming down the street, I wasn't going to wait any longer to find out the results. That whole process is pretty terrible, but it's all worth it when...
I believe it's because typical insulation is not a fire protective material. A plant fire can be very intense and the insulation isn't designed to protect against the heat and forces imparted by the fire. In addition, high pressure water or foam streams used to fight the fire may physically...
I used to work in the petrochem process industry. Those loops are definitely to allow the pipe to expand and contract thermally. By adding the loops at strategic locations, you can reduce the stress on the pipe and its supports/structure/etc. to prevent breakage.
About the only thing for the PE that they're going to check is the calculator. They WILL check to make sure that you have one of the approved models, and they WILL NOT allow you to take the exam if yours is verboten.
Other than that, the rules for the PE are largely geared toward preventing...
Thanks, guys. I'm checking out the Akron software. Only thing is that the enthalpy of the air at the summer design temperature reported by the Akron software is about 33% higher than the enthalpies reported by two other software packages, which agree with each other closely.
Okay, the statistical nature of thermo makes the RH question make sense to me. Temperature is an average measure, so there have to be some molecules above freezing, even though the bulk temperature is below 32.
Now that I have the nugget of information that lets my head accept dewpoints and...
I'm trying to figure out what happens to psychrometry when air gets really cold. I'm trying to get a handle on the TR required to bring air down to -65, but I have two problems. One, the ASHRAE charts only go down to -40. Two, it makes no sense to me to talk of relative humidity once air gets...
For what it's worth, I worked with an old salty engineer who had lots of fun phrases. One was, "You show me a plant with old steam traps, and I'll show you a plant that is leaking money."
Again, FWIW, just the sayings of a very experienced engineer I used to work with.
