What Must Be Ready Before Inflating an Air-Supported Membrane Structure?

Inflating an air-supported membrane structure is the moment it changes from “a pile of membrane and equipment” into a building that can stand up on its own. Before inflation, the membrane has no structural stiffness. Only once the blowers continuously supply air and the internal pressure reaches the design value does the structure become capable of resisting wind and snow loads. The preparation work before inflation therefore largely determines whether the closure can be completed safely on the day. This article explains, in construction order, the equipment and power conditions that must be in place, the inspection items, the parameters to monitor during inflation, and why the forming process should be as fast as possible.

How Ready Must the Equipment and Power Supply Be?

The air supply system must be fully on site before inflation day — not “equipment still in transit, installing while inflating.” The site must have a permanent, independent power source, with the air supply system connected to a dedicated circuit rather than shared with other construction loads. A trip or shutdown midway through inflation can release the pressure and undo the work — and can create safety risks.

Placement of the air supply equipment also matters: it should sit in a clean, well-ventilated area, away from dust, welding sparks and material storage zones. Poor intake air quality affects both equipment operation and the air quality inside the membrane. The same system handles air exchange and purification during later operation, so the installation environment must be properly set up from the start.

Blower capacity must meet the requirement for rapid inflation and forming. This requirement comes from the design conditions: how many blowers, and what air volume, is determined by the project design — not by on-site judgment made on the day.

What Should Be Checked Before Inflation?

Two categories of checks are required, and neither can be skipped:

1. Membrane checks: Confirm each membrane panel boundary against the design, and that connection nodes are completed as drawn. Where the membrane is connected to the foundation using clamping plates, anchor bolts or similar methods, verify each fastener is tightened before inflation — once the membrane is tensioned, correcting problems is far more costly.
2. Equipment checks: Complete commissioning of the inflation equipment and supporting systems, confirming that blowers, control systems and backup measures all start correctly before formal inflation begins.

In short: first confirm “the membrane surface and connections are complete,” then confirm “the air supply is reliable.” Only when both conditions are met should inflation start.

What Should Be Monitored During Inflation?

Inflation is not a “switch on and walk away” process. Two things need watching:

• Membrane shape: Observe whether the membrane unfolds evenly, with no local wrinkles or snagging. Address any abnormality promptly so the membrane is not tensioned in a wrong shape.
• Internal pressure: Monitor the internal pressure continuously until the membrane reaches its design shape and the pressure stabilizes within the design working range.

Both must be monitored without interruption until forming is complete. If anything abnormal occurs, stop and assess first — do not simply increase airflow to force the structure into shape.

Why Should Inflation and Forming Be as Fast as Possible?

Before reaching design internal pressure, the membrane has no structural stiffness — it is essentially a sheet of fabric. The longer forming takes, the greater the chance of encountering gusts, rain or other sudden weather changes. The membrane being loaded by wind before stiffness has developed is the highest-risk state of the entire inflation process.

That is why blower capacity is specified at the design stage for rapid inflation, and why the site must have equipment and power in place and all checks completed in advance, so formal inflation proceeds in one continuous operation. The better the preparation, the shorter the forming window — and the less time the structure is exposed to weather risk.

How Is Installation Quality Assured?

The boundary verification, node fastening and equipment commissioning before inflation are the “installation” side of the saying “thirty percent manufacturing, seventy percent installation.” For this type of work, Qingsong Membrane Structures works on the basis that membrane panels and components are delivered as finished products with no on-site fabrication; installation is carried out by partner teams under a unified process standard; and technical staff attend to supervise key nodes. The pre-inflation checklist is executed item by item against this standard. The exact division between the supplier's design coordination, custom fabrication and supply scope — and the roles of local installers — should be confirmed with the buyer and their project engineer before contract.

If you are preparing an air-supported membrane structure project, share your intended use, dimensions or drawings, and tell us which design coordination, custom fabrication, supply scope or installation support services you need, so we can review the scope with you against the conditions described in this article. Visit our contact page to start the conversation.