# FD S90-155: French guidance for medical gas networks

FD S90-155 is an AFNOR fascicule de documentation that adds elements for the design and acceptance of medical gas and vacuum pipeline systems built to NF EN ISO 7396-1; it is informative rather than a mandatory standard, and the November 2024 edition is current.

## Scope

FD S90-155 complements NF EN ISO 7396-1, the French adoption of the international pipeline standard [ISO 7396-1](https://library.ultracontrolo.com/standards/iso-7396-1/), with elements for the design and the acceptance (réception) of medical gas and vacuum distribution systems. As a fascicule de documentation (FD), it is informative: AFNOR's summary of the earlier May 2016 edition describes its content as given for information. It guides design and acceptance; the requirements remain those of NF EN ISO 7396-1.

## Edition and status

- AFNOR lists the November 2024 edition (35 pages) as a published, current document.
- The June 2023 edition is cancelled and replaced by the November 2024 edition.

## What it means for hospitals and designers

- Use it alongside NF EN ISO 7396-1, not instead of it.
- Quote the edition date, November 2024, in specifications, because the earlier edition is cancelled.
- It is used beyond France: general note II in the annex of the Portuguese ACSS ET 03/2006 (v.2024) asks for one of FD S 90-155, HTM 2022, AS 2896-1998 or SIS HB 370 to be applied when sizing medical gas distribution networks; HTM 2022 has since been superseded by HTM 02-01 (2026), and section 16 of the same specification lists AS 2896-2011 and the 2016 and 2023 editions of FD S 90-155, while the edition AFNOR lists as current is that of November 2024.
- At the outlets, French sockets and probes follow [NF S90-116](https://library.ultracontrolo.com/standards/nf-s90-116/), which requires the socket to meet NF EN ISO 9170-1.

### Is FD S90-155 mandatory?

No. It is a fascicule de documentation, an informative document; AFNOR's summary of the May 2016 edition describes its design and acceptance elements as given for information, complementary to NF EN ISO 7396-1.

## Sources

- [AFNOR, FD S90-155 (November 2024), store page](https://www.boutique.afnor.org/en-gb/standard/fd-s90155/pipeline-for-compressed-medical-gases-and-vacuum-additional-elements-for-de/fa210096/427133)
- [AFNOR, FD S90-155 (June 2023, cancelled), store page with the summary of the May 2016 edition](https://www.boutique.afnor.org/en-gb/standard/fd-s90155/pipeline-for-compressed-medical-gases-and-vacuum-additional-elements-for-de/fa207137/347357)
- [ACSS ET 03/2006 v.2024, Gases medicinais e aspiração, section 16 and annex general note II](https://www.acss.min-saude.pt/wp-content/uploads/2016/10/ET-03_2006_v2024-Gases-medicinais_VF.pdf)
- [AFNOR, NF S90-116 (October 2020), store page](https://www.boutique.afnor.org/en-gb/standard/nf-s90116/medical-gas-pipeline-distribution-systems-sockets-and-related-probes-for-me/fa191757/260496)
- [NHS England, HTM 02-01 Medical gas pipeline systems, Part A (2026), Context (supersedes HTM 2022)](https://www.england.nhs.uk/wp-content/uploads/2016/05/health-technical-memorandum-02-01-medical-gas-pipeline-systems-part-a-design-installation-validation-verification-aug-2026.pdf)

Reviewed: 2026-10-22. Ultra Controlo engineering. https://library.ultracontrolo.com/standards/fd-s90-155/