Extending an existing medical gas system begins with finding out what is actually installed. An old drawing may omit later changes, while an equipment list may not show available capacity or the isolation consequences of connecting a new ward. The first project phase is therefore evidence gathering.

Check drawings against site conditions

As-built drawings are a starting point, but they often lag behind reality. A drawing may not reflect a cylinder manifold replaced by a larger one, a pipe rerouted around a new imaging suite, or a zone valve added during a previous renovation. The equipment list may show model numbers but not the actual condition, remaining capacity, or maintenance history. For an expansion, you need to know the installed equipment, its performance under current demand and the constraints on adding load.

What to request from the facility team

Before contacting suppliers, collect the following from the hospital’s engineering and maintenance teams:

• Current as-built drawings for medical gas systems, including source equipment, distribution mains, zone valves, and alarm panels.

• Source-equipment records: model, serial number, installation date, maintenance logs, and any capacity or performance test results.

• Zone and alarm schedules: which areas are supplied, how alarms are annunciated, and what isolation valves serve each zone.

• Terminal-unit inventory: types, quantities, and locations of outlets, including any that are capped or out of service.

• Recent maintenance and test records: verification reports, leak tests, and any documented deficiencies.

• Proposed expansion details: room-by-room schedule of new services, expected demand, and any special requirements (e.g., high-flow or specific gas types).

Walk the proposed connection area with the facility team. Note discrepancies between drawings and visible equipment. Photograph nameplates and valve tags. Document anything that looks modified or non-standard.

The interface table: making unknowns visible

Prepare a table that lists existing equipment, proposed additions, shutdown constraints, and responsibility for design, installation, and verification. For each row, note whether the information is verified or assumed. For example:

Use the table to track the information that still needs verification. Ask potential suppliers to state which assumptions are based on unverified existing conditions. That way, before a quote becomes a purchase order, you know what must be confirmed.

What the responsible engineer must assess

The responsible engineer—typically a qualified medical gas systems engineer—must determine whether the existing source and distribution can support the extension. This is not a question that a catalogue capacity figure can settle. It requires review of actual demand, pipe sizing, pressure drops, and source redundancy. The engineer should also assess isolation consequences: can the new zone be isolated without affecting critical areas? Are there sufficient zone valves and alarm coverage?

Decision boundaries: when to stop and verify

There are points where you should pause and gather more evidence before proceeding:

• If as-built drawings are missing or clearly outdated, commission a survey to produce current drawings.

• If source capacity is unknown or near its limit, request a load calculation from a qualified engineer.

• If the expansion requires shutdown of existing services, develop a detailed isolation plan with the facility team.

• If responsibility for design, installation, and verification is unclear, resolve it in writing before tendering.

Resolve these points with the facility team before the expansion proceeds.

Medical Gas System Expansion Enquiries

We are Kersai Medical, based in Qingdao, China. Our range covers medical gas source equipment, pipeline components, outlets and bed head units.

Once the facility team has verified the drawings, demand schedule and source data, send us the expansion brief to discuss the component supply. Explore our medical gas pipeline range for the equipment categories.