Are there any other work practices used to control asbestos emissions during removal?

Additional control methods, which can be used alone or together, can control asbestos emissions. These include, but are not limited to:

Negative pressure enclosure systems. In a negative pressure enclosure (NPE), air is changed at least 4 times per hour and is directed away from workers within the enclosure and towards a HEPA filtration or a collection device. The NPE is kept under negative pressure throughout the period of its use. There is also a requirement to maintain a minimum of -0.02 column inches of water pressure differential. This is normally accomplished with a manometer.

Glove bag systems. A glove bag is a sealed compartment with attached inner gloves for the handling of ACM. Properly installed and used, glove bags provide a small work area enclosure and may be used to remove ACM from straight runs of piping and elbows and other connections.

Negative pressure glove bag systems. These are similar to the glove bags described above, except a HEPA vacuum system or other device is attached to the bag. They may be used to remove ACM from piping.

Negative pressure glove box systems. Glove boxes, which have rigid sides, are made from metal or another material which can withstand the weight of the ACM and water used during removal. A HEPA filtration system is used to maintain the negative pressure in the box. These systems can be used to remove ACM from pipe runs.

Water spray process system. This process can be used for the removal of ACM and PACM from cold line piping. This process can be used only if employees carrying out this process have completed a 40-hour separate training course in its use, in addition to training required for employees performing Class I work.

Courtesy of The EPA

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