30 CFR § 7.503
(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,
(2) A list of the refuge alternative's or component's parts that
(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
(4) The maximum allowable apparent temperature of the interior
space and the airlock and the means to control the apparent
(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
(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
(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.