Re: [PipingDesign] Utility Stations

From: <bbullough@foth.com>
Date: Thu Aug 30 2007 - 09:25:00 EDT

Paul:

In some facilities and conditions, the order may be dictated by safety code or accepted "common practice" application of the safety standards. In the USA for instance, the OSHA Process Safety Management standard states that, for processes (and PSM has a very encompassing definition of "process") that are affected, the P&ID must be represent the actual installation in the field. In other words, the P&ID must show the branch and run connections of T as they are (can't adjust for convenience in the DWG), and the order and location that utilities are connected or tied in. Also, a "service" or line not used (or tied in) to the process or equipment shown on the P&ID should not be shown (hell on match lines), to avoid confusion or unnecessary clutter. Note that this does not strictly dictate the order and placement of "hose connections" on a proposed left-side location, it can impact the ease of implementing a standard. I believe the EU Rule 616, approximate equivalent of the OSHA PSM rule, at least suggests the same practice. Many other jurisdictions have adopted either PSM or 616, as in general they are "common sense" and well written rules. Some companies have adopted PSM as a standard practice, even for their processes and facilties that do not fall under the code.

I know that some companies have run into problems with PSM compliant P&ID layouts because they had long-established practices of an order of placement or take-off for utilties or for match-liines.

... Bruce D. Bullough ...
Lead Process Engineer
Foth Production Systems, LLC
8550 Hudson Boulevard North, Suite 100
Lake Elmo, MN 55042
Direct: +651-288-8598 Fax: +651-288-8551 http://www.foth.com

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Paul Bowers <pbowers@pipingdesign.com>
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08/30/2007 01:06 AM
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[PipingDesign] Utility Stations

Utility stations in a process plant usually provide compressed air, steam and water to buildings and process areas. They provide these fluids usually for maintenance purposes. In some plants, dry nitrogen is included, and often a codensate return piping system is included for the steam supply.

Question: Most facilities have a standard left-to-right layout for the hose connections in order to avoid confusion. What has been your experience with the order?

WAS
AWS
SAW
etc.

Is it a good thing or a bad thing for one facility to have a different sequence?

It seems to me that utility stations might be a good candidate for standardization and therefore a commodity product.

Paul Received on Thu Aug 30 09:25:00 2007

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