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Mechanical Room Layout Resources

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bigAlittlee

Mechanical
Feb 10, 2010
13
In the few years I've been doing MEP work, I've done plenty of sizing and modeling calcs, equipment selection, etc., but until recently I haven't been faced with the task of laying out mechanical rooms.

I understand this isn't that hard and it's not that I can't do it, but every time I do one of the old timers says "yeah, that would work fine, but this way would be better" and of course, they are usually right. It feels like so much more of an art than a science to me that I feel like it may be the most challenging part of my job so far as crazy as that may sound, but I get pretty stuck on doing things the best way possible. Usually my thought of "best" is defined by a high or a low number depending on what I'm talking about.

I work large high rise projects that are always new construction. A chiller plant I have in front of me now for example has 5 chillers, 6 heat heat exchangers, and 14 pumps squeezed into odd shaped spaces that are not what us mechanical engineers would like to see, but they match the space requirements we provided, and we're stuck with making it work. I have a hard time imagining where the pipes go and what choices I could make (pump configurations etc.) to make something that seemed impossible work. Projects are never local either, which makes everything a lot more difficult. When you never see your own work in person, it's hard to know if you are doing a bad job. When I say that I mean regarding the facilities staff that are going to be tasked to make sure my design works on a day to day basis. I would like to think I'm not making their job more difficult that it should be. Not only that, architects love when we can make miracles happen and find a way to make their tiny strange shaped rooms work for our needs.

I think that gets my point across more than I needed to. So my question for the guys that have done this for years, do you have any recommendations on where I should start?
We used to have a 4-5 old timers here that were layout masters and we're down to 1 who doesn't have enough time to do much other than tell me "you can't do that because of _____" Is there a good book for all these _____'s? It seems like there are a lot of mistakes to be made but I never know what they are until I make the mistake. Thanks!

 
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One of your basic problems is this:

"Not only that, architects love when we can make miracles happen and find a way to make their tiny strange shaped rooms work for our needs."

Do not let the architects or interior desicrators hamstring you at the start. TELL THEM WHAT YOUR MINIMUM NEEDS ARE UP FRONT. Try to think like a maintenance man. Could you work on that chiller the way it is installed? How about changing out that pump? Can you really get it out of the space? Can you change the filter in that air handler or pull the coil?
Lay out the biggest items first (chiller, boiler). Avoild having the piping making so many turns, That adds pressure drop (= pump horsepower).
A lot of it is simply providing the minimum access space. Rotate equipment if possible so that they share the same access space. Provide a minimum of 3' clearance from a wall or other equipment.
You mentioned 5 chillers. How can they be removed/replaced? Will they have to be cut up in place? I have seen that kind of installation and it sucks.
There is no quick way to get years of experience. It does take years.
Good luck
 
Confucius say: Look at what it takes to work on it....Buick may a car in the 1970's that had to have the engine lifted to change the spark plugs (actually only 2 of them).

So find out what pieces in your industry require renewal or other maintenance input from time to time; read up on the manufacturers recommendations. These are often given in IOM manuals which tell you when to renew the filters; its very possible you will have to go back to some sort of cutsheet to find the filter covers and the extraction distance. Often the IOM books never make it to a designer's table and are delivered with the product to the site. Largely that makes sense but it doesn't lead to either good installations or to good maintenance because the installer who has read it all 10-times simply throws it away and nobody else sees it.

Also look at layouts for fasteners, at some point in time all of them will need to be accessed. Do you have to pull both a compressor and motor to get to a ICTD?

And don't be shy about drawing in key pipes. This is basic economics: Get the big pipes run out and connected, and you will know wher to locate nozzles on vessels as well as vessels in rooms. If you get the big stuff right, often the smaller stuff will take care of itself.







 
get the manufacturers clearance requirements. This should cover all maintenance related spaces.

Obviously pick equipment that can be easily maintained. This requires you to talk to the maintenance guys too. The manufacturers documents and rep will make it sound easy to maintain, but the maintenance crew will tell you how it is for real.

Access doors have to be wide, imagine at some time a new chiller needs to be brought in. So it shouldn't go up or down stairs etc. You also might need to replace only one (the one furthest away from the door) chiller, how do you get that out without removing all other chillers?

If the architect is difficult, give him a wrench to replace a filter in a badly accessible system and he will know
 
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