Quick-Disconnect Couplings

DOE-STD-1066-99

are present and water does not create the possibility of a criticality, then

water should be used.

15.4.1.4 In selecting the type of manual fire extinguishing unit and the application of

extinguishing agent within the glovebox, the designer should consider:

o the potential for glovebox overpressurization;

o the effect of fire extinguishing agent on filters; and

o the potential for increased contamination spread.

15.4.2 Quick-Disconnect Couplings

15.4.2.1 Where manual suppression is the primary fire suppression method for the

glovebox, pre-piped discharge points equipped with quick-connect couplings

should be provided to facilitate the use of portable fire extinguishers. These

couplings should be installed so that the extinguisher discharge is directed

away from the exhaust filtration. (Tests have shown that a single disconnect

coupling supplied by a 5 lb. [2.25 kilograms] dry chemical extinguisher can

cover approximately 18 square feet [1.62 square meters].) Details of a quick

connect coupling are provided in Appendix F.

15.4.2.2 If access is a problem, extension tubes or pipes that extend to accessible

areas should be used to provide coverage for areas where it is difficult to

reach the quick disconnect couplings.

15.4.2.3 Fire extinguishers with bayonet-type connectors may be used when it is not

feasible to install quick-disconnect couplings. However, the designer should

document the basis for not installing quick-disconnect couplings in the

design report.

15.5 Fire Detection Systems

Gloveboxes should be provided with an automatic fire detection system. (Refer to Appendix

E for examples of glovebox fire detection systems.) A separate detection system is not

required if the glovebox is equipped with an automatic fire suppression system that includes

alarm features or an inerting system with alarm features.

15.5.1 The type of fire detection system to be used should be determined based on the

hazards associated with the glovebox and operational needs. Air flow patterns within

the glovebox should be considered when selecting and locating devices.

15.5.2 Fire detection systems should be designed, installed, acceptance-tested, and

maintained in accordance with the applicable NFPA Standards.

15.5.3 If used, spot-type heat detectors should be installed not more than 8 feet (2.4 meters)

apart.

15.5.4 Heat detection-type systems should be provided with remote testing capabilities.