Case Study: Explosion-Proof Centrifugal Fan Pressurized Air Supply System

Case Study: Explosion-Proof Centrifugal Fan Pressurized Air Supply System

Many private buildings utilize explosion-proof centrifugal fans to deliver pressurized air, achieving effective ventilation tailored to their specific functional needs.

For instance, in a building spanning 29 floors, each level from the 1st to the 29th floor features two supply shafts. Two cabinet-style explosion-proof centrifugal fans on the 1st floor provide pressurized air. Air ducts are laid from the elevator shaft to the elevator lobby, with intake and exhaust ducts installed on the first and second floors.

The exhaust outlets of the explosion-proof centrifugal fan units are made of aluminum alloy, with one floor each for the 250×250 and 400×200 types.

The air ducts are constructed from galvanized steel plates. The following outlines the primary steps for manufacturing and installing the metal ductwork.

First, thorough project preparation is essential. For instance, during embedding, coordination with civil engineering is required to ensure proper embedding holes and components.

Second, on-site technicians must carefully review construction drawings before work commences, conducting inspections and analyses based on actual conditions. After confirmation, processing drawings for components like air ducts, elbows, and fabricators are extracted and numbered according to floor, location, and system.

Dimensions for components like T-pieces, elbows, reducers, etc., must strictly adhere to standard drawings. Additionally, based on on-site environmental conditions, air ducts for explosion-proof centrifugal fans should be assembled at the workshop and assembled on-site.

How should assembly proceed? When design drawings for centrifugal fan duct supports and hangers lack explicit requirements, civil engineering solutions compliant with T616 must be selected based on specific conditions. Embedded components or expansion bolts must be correctly, securely, and reliably configured to ensure structural safety.

The spacing of supports and hangers for explosion-proof centrifugal fan ducts must be set according to design rules.

Additionally, when installing air ducts for explosion-proof centrifugal fan units, it is preferable to proceed upward from the floor and system.

The general installation sequence is: first the branch pipes, then the main pipe. Note that the flexible connection interfaces for explosion-proof centrifugal fans must be secure, and the flexible connection diameter must not be altered.