![]() ![]() ![]() In normal operation, the primary exhaust provides the safe pathway of the “materials of concern” to carry the gas leak away from the equipment cabinet and occupied work area. While these monitoring locations do not eliminate potential gas pocketing from occurring, they greatly increase the likelihood of detection within the primary exhaust (i.e., the cabinet exhaust duct work). Pocketing is when an accumulation of a gas collects in a section of a ventilated enclosure and may occur if the linear velocity and mixing of airflow within the enclosure is not uniform and the gas detector is located down inside the equipment enclosure (gas cabinet, VMB, GIB). These ideal exhaust duct locations address the potential for “pocketing” of a gas leak. Minimum Distance from Duct Feature to Gas Sampleġ Diameter Upstream, 2 Diameters Downstreamġ Diameter Upstream, 6 Diameters Downstream These locations are found to achieve optimum gas sensor detection with respect to gas leak mixing and local flow behavior within the duct: The ideal equipment exhaust duct penetration and mounting locations for toxic gas detection (where mechanical exhaust features permit) should include the installation of an exhaust duct sensor or extractive tubing adapters as near as possible to the following mounting locations. In addition to assessing required gas detection technologies, their capabilities (and limitations) related to safe detection of the specified hazardous gas target, proper placement and mounting location of each hazardous gas monitoring sensor is equally critical to protecting people, equipment and the facility. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |