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This is a big "it depends" answer. You first need to make sure the whole floor assembly is a rated assembly. If it is without upgrades, you should be able to install the fire dampers in the floor if that specific fire damper has been rated by UL to be installed horizontally in a UL rated floor...

If you are continuously exhausting hot humid air, freezing shouldn't be a huge concern. Use SS duct. Drain the heck out of your duct. The drains that are outside will need to be insulated and heat traced because they'll be P-trapped, right? I think that insulation would be a cost to make...

Suggestions: - Calculate the flash steam amount in the worst case - Calculate the back pressure on the tank when that worst case flow is going through the vent to atmosphere. - Determine what you tank design temperature is. You'll have high pressure blow down condensate, there will some of that...

I'll tell you what... I've been doing project work for 20 years and every year it's the same: ***Email from manager*** "It's goal setting time! Set your goals for the next year please and make sure they are S.M.A.R.T. (Specific, Measurable, Attainable, Realistic, Timely)" ***/end email***...

I have an old book: Industrial Research Service's Psychrometric Tables and Charts by Zimmerman and Lavine Second Edition This has high temp air tables and charts. Something else that also works is an excel add-in called "@air". It is found on at: http://www.techwareeng.com/prodAA.htm It...

I think that TBP has the right approach... Find where the reliefs are set on the system at the upstream of the PRV. This is your worst case inlet pressure to the PRV. Talk to the valve manufacturer and get the max choked flow through that valve at the worst case inlet pressure. This is the...

I've worked with Caesar II, Triflex and AutoPIPE. One of the things that I was mentored on from the start was to always consider the corroded thickness. So depending on what program I've used I make sure that all analysis is on the corroded thickness. This is the most conservative path and...

Hello All, Because I handle boiler and other ASME issues, I was asked a question today about air unloading chemicals from rail cars and tanker trucks. They asked: "Why aren't those vessels ASME stamped if they operate at 45 psig?" I'm continuing to investigate, but hoped that someone here has...

Thanks for the suggestions... I think that one of the issues is the large amount of "procedures" that have recently been initiated. Considering the company I work for has a philosophy for streamlining process: this process has been fully backed by upper management. I would guess these new...

Considering I'm a "blood sucking overhead" corporate engineer... and it seems like the capital spigot has been squeezed back... I'm not sure if it's a temporary slow down or a new corporate philosophy.

Another suggestion is to look at damper manufacturers like Ruskin or Greenheck. In their submittal data they have a leakage rate @ differential pressure chart. Even if your damper isn't one of these manufacturers, you can pick a model that's similar. It should get you in the ballpark. One...

All I've been doing for the last couple of months has been project proposals and RFQ packages. I know, I know, "be happy I have a job", BUT I need some way to make this work more interesting until I get some of this stuff approved! It seems like it's all just clerical work!

I think the most straightforward answer is the termination point needs to be where it cannot do harm when a release occurs. In my opinion, that would mean a straight up discharge would need to be terminated 8' above the roof.

What about using SS instrument tubing? Does anyone have recommendations on specs to use? I'll just say this: I've checked ASHRAE for recommendations, I've checked my Piping Handbook for recommendations and... nothing... I know I can "create" something, but I'd sure like to design something...

I'm working in a relatively corrosive atmosphere and I have used coated copper tubing with some success in these environements. I would sure like to have an option to use SS tubing or piping and use SS refrigerant specialties. Any ideas? Manufacturers?

I use an Excel "plug-in" called @air... It works great and gives you many other properties if needed.

One of pro's of the custom units is the unit base. Typically the "custom" units from a Temptrol, Huntair, Ventrol, Governair, etc have a base made from a structural shape. The others typically have a base made from sheet metal formed and welded into a shape...\ Other differences I've noticed...

I agree with saplanti! (and gave him a star...) The hydrocarbon handbook series is awesome and I have been looking for all of the books. They are very hard to locate. I only have the piping and foundation design books. If anyone has any leads where to find the other books, I'd sure...

I'm looking for a standard that governs the thickness and dimensions of angle face rings... I know we've purchased them from fabricators for vacuum piping and large process water piping. Any help out there?

Where do you think the Mechanical Engineering "hot beds" of activity are? I think I know the standard places like Greenville, SC or Houston, TX but where else? I'm not currently considering re-locating, but maybe, just maybe if there is a cool place where a lot of ME opportunities exist, I can...