I will like your interpretation regarding the section 220.127.116.11.2.2 for Protection of Piping. When it states ".... embedded in concreto floors or walls...", do you interprete concrete walls, or any type of walls?
You wrote: .do you interpret concrete walls, or any type of walls? ..
I would say Section 18.104.22.168.2.2 has condition on the requirement for installing Category 1 medical gas piping in continuous conduits if they are embedded in concrete walls. Based on the meaning of concrete as building material made from a mixture of broken stone or gravel, sand, cement, and water. The piping must not be in contact with the cement of the concrete mixtures to comply with Section 22.214.171.124.2 for the piping to be protected from corrosion.
Excerpts from 2018 NFPA 99:
Let me know if this helps.
This is a common technical specification for medical gas piping protection used in the USA hospital projects that complies with NFPA requirements.
Medical gas piping shall be protected from contact with concrete floor slabs and other building materials, acceptable means shall be PVC encasement sleeves and or Polyken brand 20 mil thick adhesive wrap, extending 6" either side of contact surfaces.
During my engineering review and inspection career of the construction and design of hospitals and other health care facilities, I have often found the installation of medical gas piping was not acceptable at the pipe hangers, supports and metal framing penetrations. The galvanic action of contact to dissimilar materials (bare copper pipe contacting galvanized steel hangers/supports and the metal framing members) and isolation from the general piping/building vibration were not acceptable.
Based on the photos the bare contact surfaces of the copper piping at the galvanized steel struts and clamp supports did not appear to be isolated by adequately wrapping the pipe with a Polyethylene Tape (PE) consisting of a PE layer laminated to a Butyl adhesive or a similarly approved wrap.
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