Seismic bracing and fire protection for MEP systems in China

We are an MEP contractor based in China. We install seismic bracing, fire-rated duct enclosure and smoke control products to Chinese mandatory codes — and we explain those codes in English, because they are not the ones most foreign project teams work from.

The compliance gap

Foreign manufacturers, international engineering firms and data center operators building in China run into the same problem. The design has been prepared in accordance with ASCE 7, IBC or the relevant NFPA standards. Then the local contractor says it has to be revised before it can pass inspection.

Both sides are usually right. The two systems are built on different foundations:

Question	China	United States
How does the requirement take effect?	GB 55002-2021 applies nationwide in full. It is mandatory by law, with no adoption step by local authorities.	ASCE 7 is a model code. It applies only where a jurisdiction adopts it, and the edition adopted varies by state.
Which code governs MEP seismic design?	GB 50981-2014 for design parameters, with mandatory provisions taken over by GB 55002-2021.	ASCE 7 Chapter 13 for nonstructural components.
What decides whether bracing is required at all?	Scope thresholds set in GB 50981-2014 — by pipe diameter, duct size, equipment weight and cable tray width.	Separate thresholds in ASCE 7. The numbers are not the same.
Who verifies it?	Inspection is a mandatory prerequisite to handover. Bracing cannot be added after occupancy.	Verification path depends on the local authority having jurisdiction.

The gap is not in installation. It shows up in design review, when nobody in the room can state both positions accurately.

What we do

Installation work as a subcontractor to main contractors and to foreign-invested owners building in China.

• MEP seismic bracing — water, cable tray and duct systems, from shop drawings through to acceptance
• Fire-rated duct enclosure — smoke exhaust ductwork wrap and board systems
• Smoke curtains and smoke reservoir boundaries
• Composite ductwork — pre-insulated and fire-rated duct systems

Who we work with

Foreign-invested factories, international engineering and construction management firms, data center developers, and facility management companies running foreign-owned industrial sites in China.

Projects where the design originated outside China are the ones we know best, because that is where the two code systems have to be reconciled rather than simply followed.

Credentials

Technical notes

We are preparing a series of English notes on where Chinese and US practice actually diverge — spacing rules, bracing angles, scope thresholds, acceptance documentation, and how bracing is measured and priced here.

They are written for project managers and engineers who have to defend a position to both a Chinese contractor and a foreign design team, and who need the numbers rather than a summary.