markb

4.

Where is the in-line high pressure sensor for a medical gas system located?











A.

At the manifold.



B.

Upstream of the pressure regulator.



C.

Upstream of the main shut-off valve.



D.

Downstream of the pressure regulator.

?

__________________
--
Never give in. Never give in. Never, never, never, never--in nothing, great or small, large or petty--never give in, except to convictions of honor and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.
- Winston Churchill

Ron

Looks like a test, asking it like a test question.

Are you asking us to help you on your test.

__________________
Stephen Hawking: If the government is covering up knowledge of Aliens, they are doing a better job of it then they do at anything else.

mongo

D. Although the exact wording is thus:



5.1.9.3 The Alarm indication required in 5.1.9.2.4(7) and 5.1.9.2.4(8) shall originate from sensors installed in the main lines immediately downstream (on the patient or use side)of the source valve. Where it is necessary to install a main line valve in addition to a source valve (see 5.1.4.5), the sensors shall be located downstream (on the patient or use side)of the main valve.

NFPA 99C 2005 edition.



Area alarm panel sensors shall be on the patient side of the zone valve box.

__________________
Good plumbing ain't cheap and cheap plumbing ain't good.

Tommy plumber

NFPA 99 2005 edition states at 5.1.8.2.2 "Pressure/vacuum indicators shall be provided at the following locations, as a minimum:

(1) Adjacent to the alarm-initiating device for source main line pressure and vacuum alarms in the master alarm system
(2) At or in area alarm panels to indicate the pressure/vacuum at the alarm activating device for each system that is monitored by the panel
(3) On the station outlet/inlet side of zone valves."


So there is a line pressure indicator after source or main valve, and immediately after zone valve.

__________________
Hire a licensed master plumber.

mongo

Indicators are GAUGES.
Different from sensors (switches).
See 5.1.8.1.2

__________________
Good plumbing ain't cheap and cheap plumbing ain't good.

Tommy plumber

Thank you. I stand corrected.

__________________
Hire a licensed master plumber.

markb

Yes, test question. Preparation for my CofQ. Around here MedGas has its own certification and training, but the Government still requires you to understand the basic concepts and codes as an entry-level journeyman.

Thanks for the help. I just didn't know if MedGas systems used whole-system pressure regulators or if the pressure was adjusted on a per-unit basis or something along those lines. Thus, was unsure of D.

__________________
--
Never give in. Never give in. Never, never, never, never--in nothing, great or small, large or petty--never give in, except to convictions of honor and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.
- Winston Churchill

mongo

If Canada uses NFPA 99C as the standard, it will be the same as the USA except for label color scheme. Final line regulators are also located at the source, downstream of the filter.

__________________
Good plumbing ain't cheap and cheap plumbing ain't good.

Tommy plumber

Hey Mongo, I have a question. With regard to the sizing of med gas lines, the only thing I can fine in NFPA 99 is that it says 'minimum flow shall be availble at station outlet/inlet.' Where is sizing info for large runs? If I were to receive prints to size out a large health care facility, let's say with 250 beds, I'd have to contact a med gas engineering firm to size out all the main runs. Where is this info available,any idea? -Tom Only thing I have found is the California plumbing code, but it's pretty limited.

__________________
Hire a licensed master plumber.

mongo

I use an engineered spreadsheet on positive gases (oxygen, medical air, nitrous oxide, nitrogen, insrument air,etc.).

Vacuum systems are a little different (minimum size on any pipe is 3/4"). It is also a separate spreadsheet.

__________________
Good plumbing ain't cheap and cheap plumbing ain't good.