Which comes first in ceiling ducting/piping works? 2

[humdinger]

Good day to all.

Don't know if this is a valid question but can anyone tell me if there is an order or strict system for ceiling layout of utilities (aircon ducting, sewer, potable water piping, fire sprinklers, electrical conduits, etc.). Which comes first (topmost - below beams/slabs) and which are at the lowest (right above dropped ceiling finish)?

Thank you very much.

God bless.

 

[quark]

This is a good question rather. We always take the electrical items on top of everything. Whether it is piping or ducting depends upon the clear height available to you. I would prefer the piping to be below ducting so that you have some space available to attend leakages in future. In any case, you can match either BOD or TOD (bottom and top of ducting) to avail as maximum space as possible and keep the pipes down.

 

[berkshire]

quark (Mechanical)
After you have had a black water pipe placed through one side of your duct and out the other. With the plumber smiling sweetly at you and saying Sh*t won't run up hill, you learn to give those guys the lower areas and get your ducting away from areas where they are.
B.E.

 

[panduru]

Just wondering if hot-cold lines (piping, ducting...) need not necessarily be above electrical lines?

Also, if it's desirable to have plumbing more accessible from below for maintenance, should the same logic apply to electrical lines?

Not looking at it from the convention or "usual practice" point of view but a rational arrangement.

Let's hear what others have to say.

 

[mizzoueng]

It is up to the designer how the piping is ran. The original thought was to run the electrical above the piping so if there was a leak it wouldn't drip down onto a Bus or a transformer. I think you should have your most problematic components (piping) the lowest with the Duct above that and the electrical above that.

I understand what you are asking about the plumbing/electric. My only thought is that if you have a problem in the plumbing, you can easily fix the pipe or drain without much to-do. Even if you wanted to add on, you just tie into the piping and run the calc'c to make sure the pipe will handle the flow. With electric, you are limited by the breaker. Also, I've never heard of an eletrical line springing a leak

 

[Yorkman]

Because of the size of the duct work the sheetmetal installer usually got the right of way, the exceptions might be as mentioned, sewer, lighting fixtures that had large canisters above the ceiling, an on the off occasion steam and condensate lines or refrigerant lines, but usually these didn't require too much space. It's the pitch that is their main concern so the major problem was when or where they crossed the sheetmetal.

I'm not a real engineer, but I play one on T.V.
A.J. Gest, York Int./JCI

 

[precisionengineer]

There is no strict order. Your G.C. will have his/her preferred way. My company designs hi-rise, hi dollar condos, and I have seen G.C.'s do it 2-or 3 different ways. In most cases, the plumbing has gone in first. I personally believe that electrical should be higher than any liquid due to leaks or consensate dripping. If you work for a consultant, then I suggest that the preferred installation process (that you and other disciplines within your company agree to) be covered in your design/general notes so that the GC understands what you want to go in forst.