§ 7.503 Application requirements. ( a ) An application for approval of a refuge alternative or component shall include: ( 1 ) The refuge alternative's or component's make and model number, if applicable.
( 2 ) A list of the refuge alternative's or component's parts that includes— ( i ) The MSHA approval number for electric-powered equipment;
( ii ) Each component's or part's in-mine shelf life, service life, and recommended replacement schedule;
( iii ) Materials that have a potential to ignite used in each component or part with their MSHA approval number; and
( iv ) A statement that the component or part is compatible with other components and, upon replacement, is equivalent to the original component or part.
( 3 ) The capacity and duration (the number of persons it is designed to maintain and for how long) of the refuge alternative or component on a per-person per-hour basis.
( 4 ) The length, width, and height of the space required for storage of each component.
( b ) The application for approval of the refuge alternative shall include the following: ( 1 ) A description of the breathable air component, including drawings, air-supply sources, piping, regulators, and controls.
( 2 ) The maximum volume, excluding the airlock; the dimensions of floor space and volume provided for each person using the refuge alternative; and the floor space and volume of the airlock.
( 3 ) The maximum positive pressures in the interior space and the airlock and a description of the means used to limit or control the positive pressure.
( 4 ) The maximum allowable apparent temperature of the interior space and the airlock and the means to control the apparent temperature.
( 5 ) The maximum mine air temperature under which the refuge alternative is designed to operate when the unit is fully occupied.
( 6 ) Drawings that show the features of each component and contain sufficient information to document compliance with the technical requirements.
( 7 ) A manual that contains sufficient detail for each refuge alternative or component addressing in-mine transportation, operation, and maintenance of the unit.
( 8 ) A summary of the procedures for deploying refuge alternatives.
( 9 ) A summary of the procedures for using the refuge alternative.
( 10 ) The results of inspections, evaluations, calculations, and tests conducted under this subpart.
( c ) The application for approval of the air-monitoring component shall specify the following: ( 1 ) The operating range, type of sensor, gas or gases measured, and environmental limitations, including the cross-sensitivity to other gases, of each detector or device in the air-monitoring component.
( 2 ) The procedure for operation of the individual devices so that they function as necessary to test gas concentrations over a 96-hour period.
( 3 ) The procedures for monitoring and maintaining breathable air in the airlock, before and after purging.
( 4 ) The instructions for determining the quality of the atmosphere in the airlock and refuge alternative interior and a means to maintain breathable air in the airlock.
( d ) The application for approval of the harmful gas removal component shall specify the following: ( 1 ) The volume of breathable air available for removing harmful gas both at start-up and while persons enter through the airlock.
( 2 ) The maximum volume of each gas that the component is designed to remove on a per-person per-hour basis.