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for any supplied-air respirators a manufacturer must comply with the requirements specified in this part.* *

*8$ 12.0 to 12.20, inclusive, issued under the authority contained in sec. 311, 47 Stat. 410; 30 U.S.C. 7; E.O. 6611, Feb. 22, 1939.

fThe source of $$ 12.0 to 12.20, inclusive, is Schedule 19 A, Secretary of Interior, Aug. 9, 1937.

12.1 Preliminary statement. The Bureau of Mines is prepared at its Central Experiment Station, Pittsburgh, to conduct tests of supplied-air respirators for the purpose of determining their permissibility for use in air containing contaminants such as harmful gases, vapors, fumes, dusts, smokes, and mists, and in air containing insufficient oxygen for respiration. For the purpose of this part, supplied-air respirators include the devices commonly referred to as hose masks, air-line respirators, compressed-air respirators, sand-blast helmets and hoods, and others, which provide protection by conveying respirable air to the wearer through a hose or a combination of piping system and hose line. The purpose of the investigations under this part is to provide a list of respirators of this type that meet the Bureau's requirements for safety, durability, and efficiency in their fields of industrial usage.

This schedule is issued for the information and guidance of those who may desire to submit supplied-air respirators for tests, and also to inform consumers and other interested persons, as well as manufacturers, as to what qualities the Bureau believes such devices should have. Effective on the date of its approval by the Secretary of the Interior this part supersedes Schedule 19, Procedure for Testing Hose Masks for Permissibility, issued April 28, 1927; List of Fees, issued August 3, 1932; and the Supplement to Schedule 19, issued August 20, 1934.

Lists of permissible supplied-air respirators are published from time to time for the guidance of consumers. **

12.2 Definition of a permissible supplied-air respirator. The Bureau of Mines considers a supplied-air respirator permissible for use in harmful or objectionable atmospheres encountered in its field of industrial usage if all the materials and details of construction are the same and their performance in all respects is equal to or better than the devices that met the requirements and passed the inspection and tests of the Bureau of Mines, as hereinafter described.

The devices are designated by names other than the usual trade names. This change provides logical nomenclature for such devices, obviating dependence on a multiplicity of trade names, and provides for the naming of devices developed in this field in the future. The manufacturer, of course, may continue to advertise his device as a hose mask, air-line respirator, or abrasive blasting device.*

12.3 Types of supplied-air respirators. With regard to design and approval, supplied-air respirators are subdivided into the following types:

**For statutory and source citations, see note to 8 12.0.

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(a) Type A supplied-air respirator. The type A supplied-air respirator is commonly called a hose mask. This respirator is designed to require the presence of a man (blower operator) in addition to the wearer; to permit the wearer to inspire air through the hose, connections, and air-supply device (blower) by his lungs alone when the blower is not operated; and to permit the wearer to be drawn to safety by a life line or, if necessary, the hose in case of accident. It is the only supplied-air respirator that will be approved for use in immediately harmful atmospheres or those from which the wearer could not escape without the aid of the respirator.

The principal parts of a type A supplied-air respirator are: A hand-operated blower that shall permit free entrance of air to the hose when the blower is not operated; a strong, large-diameter hose having a low resistance to flow of air; a strong harness to which the hose and life line are attached; and a tight-fitting facepiece.

(b) Type B supplied-air respirator. The type B supplied-air respirator is similar to the type A, with the main exception that it has no blower.

It will not be approved for use in immediately harmful atmospheres or those from which the wearer could not escape without the aid of the device.

The principal parts of a type B supplied-air respirator are: A strong, large-diameter hose having a low resistance to flow of air; a harness to which the hose is attached; and a tight-fitting facepiece.

(c) Type C supplied-air respirator. The type C supplied-air respirator is designed for routine use in protecting workers against harmful or objectionable atmospheres that are not immediately dangerous to life or from which the wearer could escape. It may be used with either a low- or high-pressure air-supply system. It is the responsibility of the user to provide respirable air either by a compressor that does not use an internal lubricant that could produce gases or mists that may be objectionable or injurious to health, or by one that is protected by suitable filters, temperature regulators, and alarms.

The principal parts of a type C supplied-air respirator are: A positive-pressure air-supply system; a hose; a detachable coupling; a control valve or orifice; arrangement for attaching hose to wearer; and a respiratory-inlet covering. Where the supply pressure exceeds 25 pounds per square inch gage, a pressure-release mechanism is required.

The general term "respiratory-inlet covering" is used for the covering worn over the face or head by the wearer of the respirator, when otherwise it would be necessary to use an expression such as "facepiece, half facepiece, helmet, or hood.”

(d) Type AE, BE, and CE supplied-air respirators. Suppliedair respirators may be modified for use in abrasive blasting. The letter E added to the regular-type letter indicates that the type of respirator designated by the first letter has been modified or provided with additional equipment to make it suitable for use in abrasive

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blasting. Such changes or additions consist primarily of providing a suitable covering to protect the head and shoulders against impact and abrasion by the rebounding material.**

12.4 Instructions for submitting equipment and conditions under which respirators will be tested-(a) Consultation. Manufacturers or their representatives may visit or communicate with the Pittsburgh Experiment Station of the Bureau of Mines to obtain criticisms of proposed designs or to discuss the requirements of this schedule in connection with a device to be submitted. No charge is made for this consultation and no written report will be made to the manufacturer.

(b) Application. Before the Bureau of Mines will undertake the active investigation of any supplied-air respirator, the manufacturer shall have filed an application in the form of a letter which contains (1) a description and complete drawings of the device (supplemented with any available printed matter); (2) a statement that the device is completely developed and of the design and materials which the manufacturer believes suitable for a finished marketable device; (3) a statement that the device has been subjected to inspections and tests of the nature described in this schedule and that it has met these requirements when tested by the manufacturer or his testing agency; (4) a statement describing the nature, adequacy, and continuity of control of the quality of the respirator (see Š 12.7, control test requirements); and (5) a request that the necessary inspections and tests leading to approval be made. No supplied-air respirator will be accepted for permissibility tests unless it is substantially in the completed form in which it is to be marketed. Application for tests shall be indicative of this understanding by the manufacturer. The application shall be addressed to the Director, United States Bureau of Mines, Washington, D. C. A copy of the application, together with two copies of all drawings and printed matter and one complete specimen of the device for which approval is desired, shall be sent to the Chief Chemist, Health Division, United States Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa.

On receipt of this application, descriptive material, and specimen to be tested, the manufacturer will be notified by the Bureau of Mines of its action on the application, the amount of fee necessary, the amount of material required for test, and any additional information or specifications that are deemed necessary. The manufacturer shall, in turn, furnish the information and material necessary, together with a certified check, bank draft, or United States postal money order, payable to the Treasurer of the United States, to cover the fees for inspection and tests. This fee shall be sent to the Director, United States Bureau of Mines, Washington, D. C. The information regarding the device and all material for tests shall be sent to the Chief Chemist, Health Division, United States Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa.

The fee will be placed on special deposit in the Treasury of the United States, pending disposal as hereinafter specified.**

**For statutory and source citations, see note to g 12.0.

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12.5 Fees for testing supplied-air respirators. The following fees are charged for investigating respirators under this part:

SCHEDULE OF FEES FOR APPROVAL

15

(a) Types A or AE supplied-air respirators (complete)

$100 Blower, single outlet Each outlet more than one (at time of blower testing)

5 Air-supply line (hose).

50 Respiratory-inlet covering

30 (b) Types B or BE supplied-air respirators (complete)

80 Air-supply line (hose).

50 Respiratory-inlet covering-

30 (c) Types C or CE supplied-air respirators (complete).

80 Air-supply line (hose)-

50 Respiratory-inlet covering

30 (d) Estimate of fees for tests not included in this list or for portions of

tests that may be required for extensions of approval to new parts

of respirators will be supplied on written request. If a respirator fails to pass the specified tests and the manufacturer decides to terminate further consideration of the device, a portion of the fee sufficient to cover the work done will be turned into the Treasury of the United States and the remainder returned to the manufacturer. If it is desired to resubmit the respirator for approval after the necessary improvements have been made, an additional fee will be required. The amount of fee charged will be proportional to the additional tests that must be made and will be specified in writing to the applicant in advance of resubmission of the device.

The fees specified herein may be increased to cover the cost of testing an unusually complicated apparatus or performing unusually difficult tests. The fees are subject to change upon the recommendation of the Director of the Bureau of Mines and the approval of the Secretary of the Interior.**

12.6 Drawings and specifications required. Respirators submitted for approval will not be inspected or tested until a complete description and two full sets of drawings showing all the details of construction have been delivered to the Chief Chemist, Health Division, at the United States Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa.

The Bureau of Mines will not be responsible for any disclosures of ideas, principles, or patentable features because, under the terms of the application for tests, it is understood that the device is ready for release to public market. Caution will be exercised to prevent disclosure of details of these devices to the public during approval testing.**

12.7 Control-test requirements. To maintain the quality of protection equal to that of the devices submitted for permissibility tests and to which approvals may be granted, the Bureau of Mines considers it necessary that the manufacturer maintain adequate control of the production of the device and make tests of assembled devices to insure the fit of parts, freedom from air leakage, and general suitability. For these reasons the Bureau requires a statement

**For statutory and source citations, see note to 8 12.0.

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with each application for permissibility tests that will show the nature, adequacy, and continuity of the control provided by the applicant. If deemed desirable and requested by the Bureau of Mines the manufacturer shall grant permission for a representative of this Bureau to make a personal inspection of the control-test equipment, the personnel conducting the control tests, and the control-test records. Îests for approval will be made only after the Bureau is satisfied that such control is effective, and approvals once granted will remain in force only while the control is sustained.* *

12.8 Material required for approval testing. The number of complete respirators and replacement parts required will depend on the type and design of the device. After application for test is received the manufacturer will be notified concerning the material that it will be necessary for him to submit. All materials for test shall be delivered gratis, with transportation charges prepaid by the manufacturer, to the Chief Chemist, Health Division, United States Bureau of Mines, 4800 Forbes Street, Pittsburgh, Pa. The Bureau of Mines may retain as its own property any or all material submitted by the manufacturer that may be required for record. Material not required for record will be available to the manufacturer and will be returned at his expense on shipping instructions made in writing to the Chief Chemist, Health Division.**

12.9 Date for conducting tests. The tests will be made in the order that the applications are received, provided that all pre-test conditions have been fulfilled. The manufacturer will be notified of the date on which tests will be begun. If a device fails to meet any of the requirements it shall lose its order of precedence. Tests will be resumed following completion of other approval work in progress at the time both the request and material for retesting are received. Exceptions may be made only for minor tests and inspections that may be performed simultaneously with other work in the laboratory.*+

12.10 Witnesses. No one is to be present at the tests except the necessary Government officials, their assistants, and representatives of the manufacturer of the respirator under examination. If the manufacturer's representative is not known to the Chief Chemist of the Health Division, he must have credentials showing that he has been authorized by the manufacturer to witness the tests. The detailed results of tests shall be regarded as confidential by all present at the tests and by the Bureau of Mines. The manufacturer or his representative shall understand and agree that compliance with the request to keep the results of the tests confidential is one of the requirements for approval and maintenance of approval.*+

12.11 Notification to manufacturer of approval or disapproval. After the Bureau has considered the results of the tests a formal written report of the approval or disapproval of the respirator will be supplied to the applicant by the Director of the Bureau of Mines. No oral reports will be made. If the device passes all requirements, the formal report will not be accompanied by any test data or detailed

**For statutory and source citations, see note to 8 12.0.

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