You are correct. When you submit the code revision, can you include threaded plugs for auxiliary valves are permissible also?

Reference section 5.1.3.5.14.3 and 5.1.4.10.1

I agree with one clarification. If the designer can alleviate any future outages that impact critical areas, then they probably should install a valve on the source side of the zone valve box. Naturally it depends on the situation. For every single OR, it probably doesn’t make sense.

Hi Josh, great topic! We’re seeing more and more boom-only replacement projects here in Northern CA as well. My team performs same verification steps you describe. For the 10-minute standing pressure test, we perform it twice: first with the boom disconnected to evaluate the condition of the existing piping, and then a second time with the…

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I keep seeing new designs with valves in the ceiling just above every zone valve box in the building. The Service Valve belongs close to the Main Line or Riser and may control multiple zone valves on the same floor. This allows for backfeeding multiple zones from one location against this closed Service Valve.

Recently, I saw a future OR…

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If Medical Air cylinders are the only gas in the manifold room, they won’t create an oxygen enriched or oxygen deficient atmosphere in case of a leak.

The relief valves are covered in NFPA 99, 2024; 5.1.3.5.6.1(4).

They shall be vented to the outside of the building, except that relief valves for compressed air systems having less than 3000 cu ft…

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Hello Medical Gas Professionals!

I’m curious how other verification companies approach new operating booms when no medical gas piping work was performed.

We’ve found that many contractors are hesitant to authorize a full verification in these situations. Here in California, however, HCAI oversight is fairly stringent, so we tend to take a…

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PLEASE NOTE:

Our Annual MGPHO meeting is in Las Vagas NV / Oct 06, 07, 08 – 2026

check Out

http://www.mgpho.org – for additional information.

Please review NFPA 99 2024 Edition Section # 5.1.10.8 Threaded Fittings:

Pass or Fail Question.

Between the EOSC on the outside of the Facility and Check Valve Inside the Facility.

There is the required 75 psig Relief Valve. This relief valve most always has a Threaded Fitting.

To the best of my knowledge, Section # 5.1.10.8 Threaded Fittings does…

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I just received notice that the design engineer has determined that these gas systems do not need to be this large. Disregard this post.

Has anyone seen or been involved with the installation of medical air and instrument air piping with pipe sizes of 10″ or 12″?

Working on a project in which the design engineer is indicating these large pipe sizes for a high-rise hospital.

Thanks, Mark. I had only looked at the updated 5.1.3.3.2 permitted locations

Thanks, Cary. I had missed that in the annex. That’s helpful to have something to show in writing in the guidebook.

Jonathan, There is intended to be a new clause specific for vacuum which is the analogue of the patient gases clause (still to be voted of course).

It would read:

5.1.3.5.2.1

Central supply systems for medical surgical vacuum shall be piped only to vacuum Inlets complying with 5.1.5 and Into areas where the vacuum will be used for…

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Hi Jonathan,

I think you have hit the nail on the head with your references. The other one I like to point to comes from the annex and address one of your problem areas directly. While the annex is not part of the code and is meant to be explanatory, I normally caution people against doing the opposite of an annex recommendation because an AHJ…

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I have an issue that comes up occasionally, where engineers want to put vacuum inlets into decon or scope rooms. In practicality I believe its a bad idea, but since “5.1.3.5.2 Permitted Locations for Medical Gases” doesn’t mention vacuum, I’ve had it argued that’s ok. I’ve used “5.1.14.3.3 Liquid or debris shall not be introduced into…

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Most relief valves on dental manifolds are not threaded to attach vent piping. They just dump in the closet. That is why natural or mechanical exhaust of the room is so important.