Which standard governs road tunnel fire safety in Qatar?

On projects of Ashghal, Qatar's Public Works Authority, and on road tunnels it operates and maintains, fire and life safety systems are designed to NFPA 502, 2014 edition, as modified by Ashghal's Interim Advice Note 020 (Rev A2, July 2016). The note treats any enclosed roadway with access limited to portals, including underpasses, as a road tunnel.

Does Qatar require a fixed firefighting system in every road tunnel?

No. IAN 020's table of minimum road tunnel fire protection lists a fixed water-based fire-fighting system as a conditionally mandatory requirement in NFPA 502 Category C and D tunnels, and says that where one is installed it must follow Section 7.10 and Chapter 9 of NFPA 502 (2014). Every road tunnel design also needs an engineering analysis that includes a risk assessment.

Which standard governs rail fire safety in Dubai?

The Roads and Transport Authority's Dubai Rail Planning & Design Guidelines for railway projects undertaken by developers (May 2013) make Dubai Civil Defence the authority having jurisdiction for compliance with NFPA 130. Design follows the UAE Fire and Life Safety Code of Practice and local Dubai codes, and NFPA 130 with its related NFPA standards where the UAE code does not apply.

How should tunnel fire detection relate to a fixed firefighting system?

IAN 020 requires automatic fire detection in a tunnel to be zoned to match the ventilation zones and the water-based fixed fire-fighting system zones, and where a tunnel has both, the detection is zoned to the fixed firefighting system. Detection that locates the fire to one zone is what lets a zoned system discharge where the fire is.

Can a Gulf tunnel project cite European water mist standards?

In Qatar, only with agreement. The Civil Defence Technical Requirements Guide adopts NFPA codes and standards as its principal reference for requirements it does not address itself, and says requirements from other fire and engineering codes and standards should have the prior concurrence of the General Directorate of Civil Defence before they are applied.

Tunnel Fire Safety in the Gulf: NFPA 502 and NFPA 130

Tunnel fire safety in the Gulf is written in NFPA terms. Road tunnels in Qatar are designed to NFPA 502 as modified by the Public Works Authority, and rail projects that developers undertake in Dubai answer to NFPA 130, with Dubai Civil Defence as the authority having jurisdiction. The details sit in two government documents, and both matter to anyone proposing a fixed firefighting system.

Road tunnels in Qatar: NFPA 502 as modified by Ashghal

Ashghal's Interim Advice Note 020, Road Tunnel Fire and Life Safety Systems, sets the minimum design requirements for road tunnel fire and life safety systems on Public Works Authority projects and on any road tunnel Ashghal will operate and maintain (Ashghal). Revision A2, dated July 2016, adapted the note to the 2014 edition of NFPA 502 and superseded the September 2013 revision.

Four provisions shape a tunnel design:

Scope. A road tunnel is any enclosed roadway designated for motor vehicle traffic, of any length, with access limited to portals, and that includes all underpasses.
Design basis. Fire and life safety systems are designed to NFPA 502, 2014 edition, as modified by the note's Appendix A.
Risk assessment. In all cases, the design includes an engineering analysis with a risk assessment of which fire and life safety systems each tunnel needs, and the note's modification to NFPA 502 requires that analysis regardless of the tunnel's length.
Fixed firefighting. The note's table of minimum road tunnel fire protection lists a fixed water-based fire-fighting system as conditionally mandatory in NFPA 502 Category C and D tunnels. If one is installed, it must follow Section 7.10 and Chapter 9 of NFPA 502, 2014 edition.

Detection is tied to the suppression zones. Automatic fire detection within a tunnel is zoned to match the ventilation zones and the water-based fixed fire-fighting system zones, and in a tunnel with both, the detection is zoned to the fixed firefighting system. That is the arrangement a zoned system needs: a detector that places the fire in one zone lets the system open that zone and its neighbours rather than the whole bore. Ashghal's tunnel concept of operation lists NFPA 502 among its reference standards as well (Ashghal).

One point to settle early: IAN 020 cites the 2014 edition, while NFPA's current edition of NFPA 502 is the 2026 edition (NFPA). A submission should confirm which edition the reviewer will apply. How NFPA 502 treats fixed firefighting in general is set out in NFPA 502 explained.

Rail in Dubai: NFPA 130, with Dubai Civil Defence as AHJ

The Roads and Transport Authority's Dubai Rail Planning & Design Guidelines cover railway projects undertaken by developers in the Emirate of Dubai; the edition published online is dated May 2013 (RTA). Its fire and life safety section sets out a clear chain:

a fire safety certificate from Dubai Civil Defence is a prerequisite for the RTA to issue safety certificates for the provision of a public service;
Dubai Civil Defence acts as the authority having jurisdiction for compliance with NFPA 130;
design complies with the directives Dubai Civil Defence gives in the UAE Fire and Life Safety Code of Practice, which the guidelines call the Civil Defence Fire Code, and with local Dubai building codes;
where the UAE code does not apply and Dubai has set no specific requirements, design is based on NFPA 130 together with the related NFPA standards it quotes;
rolling stock is designed to NFPA 130 or CEN/TS 45545.

The guidelines also note that NFPA 130 allows fire engineering as an alternative to its standard requirements, and they require the designer to show that a proposed solution meets the intent of NFPA and the Civil Defence Fire Code using established fire safety engineering methods. What NFPA 130 itself requires in trainways and stations is covered in NFPA 130 explained.

Saudi Arabia

The Saudi Fire Protection Code, SBC 801, is the national fire code, in a 2024 edition (Saudi Building Code Center). Its 2024 table of contents has no section dedicated to tunnels (SBC 801 contents), so on a Saudi tunnel project the fire safety basis has to be agreed with the client and the authority rather than read from one code section.

Where water mist fits

In NFPA 502 terms, a water mist fixed firefighting system is one form of fixed water-based fire-fighting system, and the system itself is engineered to NFPA 750. Qatar's Civil Defence Technical Requirements Guide lists both NFPA 502 and NFPA 750 among its references, and adopts NFPA codes and standards as its principal reference for requirements it does not address itself (Qatar Ministry of Interior).

The same guide says its own requirements prevail where they conflict with NFPA, and that requirements from other fire and engineering codes and standards should have the prior concurrence of the General Directorate of Civil Defence before they are applied. A Qatari project that wants to rely on EN 14972 fire test evidence or a VdS guideline should secure that concurrence before the design depends on it. How approval works across the region is covered in water mist approval in the Gulf, and the choice between mist and deluge in water mist vs deluge in tunnels.

What a Gulf tunnel submission should settle early

which document governs, and which edition of NFPA 502 or NFPA 130 it cites;
the tunnel's NFPA 502 category, and whether a fixed firefighting system is required, conditionally required or proposed;
the engineering analysis and risk assessment behind that decision;
detection zoned to the fixed firefighting system zones;
the authority having jurisdiction, and its concurrence for any standard outside NFPA;
fire test evidence for the system in a tunnel fire scenario, naming the protocol and the laboratory.

Where Mistelix stands

Mistelix designs its water mist systems with reference to NFPA 750. Full-scale fire testing, FM Approval and UL listing are planned. Our live status against every standard we work to is in our approvals ledger.

Sources: Ashghal, IAN 020 Rev A2, Road Tunnel Fire and Life Safety Systems and tunnel concept of operation; RTA, Dubai Rail Planning & Design Guidelines, May 2013, section 2.6; Qatar Ministry of Interior, Civil Defence Technical Requirements Guide; Saudi Building Code Center, SBC 801 (2024) and its table of contents; NFPA, NFPA 502.