A system for controlling dust during hydraulic fracturing operations includes a manifold having a plurality of ports for capturing dust when negative air pressure is applied to the manifold. A support frame positions the manifold above a piece of hydraulic fracturing equipment receiving sand from a sand source.

The invention herein disclosed is a system that supports sampling, testing and filtering of air in selected small volumes of air within a larger air pool.

Disclosed are processes, apparatuses, and systems in natural gas pipelines to significantly reduce pigging and blowdown emissions. In an example, a process involves filtering and/or separating pigging or blowdown emissions. The filtered and/or separated pigging/blowdown products can then be stored in a storage, sent back into the natural gas pipeline at a downstream location, or sent to an adjacent pipeline.

A nail salon bio-hazardous dust and fume source capture ventilation apparatus and system to automatically operate at individual manicure and pedicure work stations including means for conserving preconditioned room air and preventing cross contamination between work stations while reducing fan noise without filters.

To provide a mist collecting system for multiple processing chambers that appropriately performs mist collection in multiple processing chambers by a single mist collector. A mist collecting system for multiple processing chambers including a mist collector configured to collect mist generated in a processing chamber, a duct that is branched and configured to connect the mist collector to multiple processing chambers, multiple electric duct shutters that are provided corresponding to the multiple processing chambers and are piped to branched portions of the duct, and a control device configured to control the mist collector and opening/closing of each of the multiple duct shutters.

Disclosed are processes, apparatuses, and systems in natural gas pipelines to significantly reduce pigging and blowdown emissions. In an example, a process involves filtering and/or separating pigging or blowdown emissions. The filtered and/or separated pigging/blowdown products can then be stored in a storage, sent back into the natural gas pipeline at a downstream location, or sent to an adjacent pipeline.

Disclosed are processes, apparatuses, and systems in natural gas pipelines to significantly reduce pigging and blowdown emissions. In an example, a process involves filtering and/or separating pigging or blowdown emissions. The filtered and/or separated pigging/blowdown products can then be stored in a storage, sent back into the natural gas pipeline at a downstream location, or sent to an adjacent pipeline.

The invention herein disclosed is a system that supports sampling, testing and filtering of air in selected small volumes of air within a larger air pool.

Fume evacuation systems are disclosed. An example fume evacuation system includes: an air handling system for drawing components comprising air, fumes, smoke, or particulate, or a combination thereof from a metal working application; an air conduit couple to the air handling system for conveying the components from the metal working application towards the air handling system; and a hood coupled to the air conduit and configured to be positioned at the metal working application, the hood comprising a structure defining a circuitous path for particulate that, in operation, allows the airborne components to pass through the hood to the air conduit but causes particulate to cool the components.

A system for controlling dust during hydraulic fracturing operations includes a manifold having a plurality of ports for capturing dust when negative air pressure is applied to the manifold. A support frame positions the manifold above a piece of hydraulic fracturing equipment receiving sand from a sand source.