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THE AUTHORITY IN PLUMBING SYSTEM DESIGN AND ENGINEERING
Medical Gas
What Should Engineers Know?
THE AUTHORITY IN PLUMBING SYSTEM DESIGN AND ENGINEERING
Course Description• In this course we will discuss a variety of items that every
engineer should be aware of which will lead to the medical
gas system being installed in such a manner that promotes
patient well-being and safety. Utilizing industry “lessons
learned” and code sections hopefully we can help eliminate
some of the most common (and costly) mistakes. Additionally
we will go over some of the differences between the
upcoming 2018 edition of NFPA 99 compared to previous
editions.
Learning Objectives
1. Why are medical gases important?
2. Pre-design (codes, standards, and AHJ’s)
3. Design coordination (common items)
4. Construction administration - and beyond
5. NFPA 99 2018 Update
Why Is This Important?
When not properly installed, medical gases can be dangerous.
• Austin Stone
Pre-Design: Codes, Standards, and…
NFPA 99 2012:
• Category 1 -“major injury or death” - ICU
• Category 2 -“minor injury” - Outpatient
• Category 3 -“discomfort” – Dental (?)
• Category 4 – N/A
Pre-Design: Codes, Standards, and…
Pre-Design: Codes, Standards, and…
Anesthesia
Pre-Design: Codes, Standards, and…
Pre-Design: Codes, Standards, and…
Pre-Design: Codes, Standards, and…
Pre-Design: Codes, Standards, and…
5.1.3.5.2 Permitted Location for Medical Gases
1) Direct respiration by patients
2) Clinical application of the gas to a patient, such as
the use of an insufflator
3) Medical device applications directly related to
respiration [by patient]
4) Power for medical devices used directly on patients
5) Calibration of medical devices intended for (1)
through (4)
Pre-Design: Who is the AHJ for Medical
Gas Systems?
Pre-Design: Who is the AHJ for Medical
Gas Systems?
• Medical gas inspector and verifier
• Third party hired by owner
• Certified (i.e. Inspector ASSE 6020, Verifier
ASSE 6030)
• Same person?
• Worth identifying and getting involved
early!
Design Coordination: Source Equipment
Vs.
Vs.
Design Coordination: Source Equipment
Design Coordination: EOSC Coordination
Emergency Oxygen Supply connection
• 11.7.3.5.1.1 – Protect oxygen from coming in contact with
asphalt due to spark/static concerns.
• 20' w x 20' long Concrete pad for EOSC
• For EOSC - 18' long trailer, 500 gal
• Standard Oxygen tanker is 65' long
Design Coordination: Why are all these
locations important?
Design Coordination: ZVB
• Depth
Design Coordination: ZVB
• Width
Design Coordination: ZVB
5.1.4.8 Zone Valves. All station outlets/inlets shall be supplied
through a zone valve as follows:
1) The zone valve shall be placed such that a wall
intervenes between the valve and outlets/inlets that it
controls
2) The zone valve shall serve only outlets/inlets located in
the same story
3) The zone valve shall not be located in a room with station
outlets/inlets that it controls.
Design Coordination: ZVB
Design Coordination: ZVB
5.1.4.8.4 zone valve boxes shall
be installed where they are visible
and accessible at all times.
Construction - and Beyond
System checks (and back checks)
• Required when a system is breached: pipeline intrusion or
component replacement.
• System meets NFPA 99 Standards
• Proper equipment and material were used
• Work was performed % pretested by credentialed installers
• Systems are functioning properly
• Gas purity/particulates are safe for patient use.
• Documentation for facility record.
Construction - and Beyond: Installer
Preconstruction Meeting
• Certification Review
• Material Review
ASSE 6010
• System Clearing
• Pressure Test
• Cross Connection Test
• Initial Piping Purge Test
• Repair Leaks and Defects
• Repair Medical Gas Systems
• Provide Report to Engineer
Construction - and Beyond: Inspector
ASSE 6020
• Inspector’s Log
• Test and Inspection Report
• Document List
• Confirm compliance with NFPA 99
• Visual inspections
• Final System Verification Report
• Report Data
Construction - and Beyond: Verifier
ASSE 6030
• Prepare Test Equipment
• Standing Pressure and
Vacuum Tests
• Cross-Connection Test
• Shut-Off Valve Test
• Master, Area, and Local
Alarm Test
• Piping Purge Test
• Piping particulate Test
• Piping Purity Test
• Final Tie-In Test
• Operational Pressure Test
• Medical Gas Concentration Test
• Medical Air Purity Test for Compressor Systems
• Labeling of System Components
• Medical Gas Supply Source Tests
• Medical Air Compressor System Tests
• Medical/Surgical Vacuum System Tests
• Bulk Medical Gas Supply System Tests
• Odor Test (2015)
NFPA 99 2018 Updates: Items of Note
• A new Chapter 15, on dental gas and vacuum piping systems within
a healthcare facility, has been added to the code.
• All information pertaining to dental facilities has been removed from
the text of Category 3.
• Permitted Locations: added simulation areas.
• Auxiliary Source Connection now required.
• Corrugated Medical Gas Tubing (CMT) is now allowed.
• HEPA filter now required on vacuum inlet of the vacuum system inlet.
Summary
• Pre-design (codes, standards, and AHJ’s)
• Design coordination (common items)
• Construction - and beyond
• NFPA 99 2018 Update
• Why is this important?
Questions?
CHRISTOPH LOHR PE, CPD, LEED AP BD+C, ASSE 6020
Technical Leader | Plumbing Engineer
HENDERSON ENGINEERS
5343 N. 16th Street, Suite 460 | Phoenix, AZ 85016
TEL (602) 336-5240 CELL (248) 736-4940
HENDERSONENGINEERS.COM
LICENSED IN AZ, NV
“CREATING ENVIRONMENTS WHERE PEOPLE CAN REACH THEIR FULL POTENTIAL.”