Flexible fugitive emission capture hood

Publish Time: 07/27 2026 Author: Site Editor Visit: 23

A transparent, flexible fugitive emission capture hood or sleeve functions similarly to a flexible isolator: it is transparent and bendable, capable of enclosing equipment while retaining visibility and connecting to an exhaust leakage monitoring system to extract fugitive volatile organic compounds (VOCs) and other gases. An inert atmosphere can be formed inside by injecting nitrogen or argon.

Advantages

Lower capital investment
Shorter lead time
Easy installation

Typical Applications

Capture and monitor VOC emissions from pump shaft seals, stuffing boxes, valves, flexible joints/bellows expansion joints, vessels and equipment sampling points. Built-in maintenance access: glove ports, zipper service windows or access panels for in-hood operation when needed. For scenarios involving flammable solvents or dust, anti-static and earthing measures can be realized via conductive layers or earthing terminals, alongside explosion-proof construction. Serve as temporary or retrofitted emission control solutions where rigid hoods cannot be deployed. Local emission control for small equipment or maintenance operations in chemical, petrochemical, pharmaceutical and laboratory settings.

Defined Performance Parameters (For Specification Formulation)

Target negative pressure & capture air volume: Small hoods operate under slight negative pressure (e.g., pressure differential: −50 ~ −250 Pa); exhaust airflow shall be calculated according to target capture velocity. Expected VOC types and concentrations: Determine material selection and downstream treatment technologies (activated carbon adsorption, thermal oxidation, etc.). Operating temperature of hood surface: Governs material selection. Range of mechanical movement: Rotation angle, translation distance or vibration amplitude. Service frequency: Continuous operation or intermittent use. Presence of explosion hazardous classified zones and anti-static requirements.

Safety & Regulatory Considerations

Where flammable solvents or dust hazards exist, the conductive layer must be grounded.
If installed in classified hazardous areas, fans and monitoring instruments shall obtain ATEX / IECEx explosion-proof certification.
For pharmaceutical applications, cleanability and material compliance (biocompatibility, cleanroom validation, etc.) shall be taken into account.
Spent adsorbents and cleaning liquids must be disposed of in accordance with hazardous waste regulations.

Hood Thickness

Small-sized hoods adopt transparent PVC, TPU, silicone or fluoropolymer sheets with thickness of 0.5–2.0 mm; heavy-duty or high-temperature applications use materials 1–3 mm thick or thicker.