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8 minutes with 1-hour (C)-type, and 10 minutes with 2-hour (D)type apparatus.

(7) Run at the rate of 6 to 8 miles per hour 300 feet with 1/2-hour (A)-type, 400 feet with 34-hour (B)-type, 600 feet with 1-hour (C)type, and 600 feet with 2-hour (D)-type apparatus, consuming while doing this 1 minute with 1/2-hour (A)-type, 2 minutes with 34-hour (B)-type, 3 minutes with 1-hour (C)-type, and 3 minutes with 2-hour (D)-type apparatus.

(8) Walk, at a rate of not less than 3 miles per hour, for 3 minutes with 1/2-hour (A)-type, 5 minutes with 3/4-hour (B)-type, 7 minutes with 1-hour (C)-type, and 15 minutes with 2-hour (D)-type apparatus.

79) Allow 2 minutes for taking air samples and temperature readings.

(10) Walk, at a rate of not less than 3 miles per hour, for 2 minutes with 12-hour (A)-type, 3 minutes with 34-hour (B)-type, 6 minutes with 1-hour (C)-type, and 10 minutes with 2-hour (D)-type apparatus.

(11) Carry a sack of bricks weighing 50 pounds over an overcast, making one complete trip every 2 minutes, 2 times with 1/2-hour (A)type, 3 times with 34-hour (B)-type, 4 times with 1-hour (C)-type, and 5 times with 2-hour (D)-type apparatus.

(12) Walk, at a rate of not less than 3 miles per hour, for 2 minutes with 1/2-hour (A)-type, 4 minutes with 34-hour (B)-type, 4 minutes with 1-hour (C)-type, and 8 minutes with 2-hour (D)-type apparatus, taking air samples and temperature readings at end of test of each type apparatus except 2-hour (D)-type apparatus test.

(13) Continue test with 2-hour (D)-type apparatus by walking, at a rate of not less than 3 miles per hour, for 28 minutes, taking an air sample and temperature readings at end of test.

(f) Tests 10 and 11. These tests will be repetitions of test 9. (g) Test 12. In test 12 the wearer of the apparatus shall:

(1) Walk, at a rate of not less than 3 miles per hour, for 2 minutes with 1/2-hour (A)-type, 3 minutes with 34-hour (B)-type, 4 minutes with 1-hour (C)-type, and 8 minutes with 2-hour (D)-type apparatus.

(2) Run, at a rate of 6 to 8 miles per hour, 300 feet with 12-hour (A)-type, 300 feet with 34-hour (B)-type, 600 feet with 1-hour (C)type, and 600 feet with 2-hour (D)-type apparatus, consuming while doing this 1 minute with 1/2-hour (A)-type, 1 minute with 34-hour (B)-type, 2 minutes with 1-hour (C)-type, and 2 minutes with 2-hour (D)-type apparatus.

(3) Raise a 45-pound weight a vertical distance of 5 feet, 30 times with 1/2-hour (A)-type, 45 times with 34 hour (B)-type, 60 times with 1-hour (C)-type, and 75 times with 2-hour (D)-type apparatus, consuming, while doing this 2 minutes with 1/2-hour (A)-type, 3 minutes with 34-hour°(B)-type, 4 minutes with 1-hour (c)-type, and 5 minutes with 2-hour (D)-type apparatus.

(4) Carry a 45-pound weight 200 feet with 12-hour (A)-type, 400 feet with 34-hour (B)-type, 200 feet with 1-hour (C)-type, and 1,000

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feet with 2-hour (D)-type apparatus, consuming while doing this 1 minute with 1/2-hour (A)-type, 2 minutes with 34-hour (B)-type, 2 minutes with 1-hour (C)-type, and 5 minutes with 2-hour (D)-type apparatus.

(5) Carry a sack of bricks weighing 50 pounds over an overcast, making one complete trip every 2 minutes, 2 times with 1/2-hour (A)type, 3 times with 34-hour (B)-type, 4 times with 1-hour (C)-type, and 5 times with 2-hour (D)-type apparatus.

(6) Allow 2 minutes for taking air samples and temperature readings.

(7) Walk, at a rate of not less than 3 miles per hour, for 2 minutes with 12-hour (A)-type, 4 minutes with 3/4-hour (B)-type, 5 minutes with 1-hour (Ć)-type, and 8 minutes with 2-hour (D)-type apparatus.

(8) Carry a sack of bricks weighing 50 pounds over an overcast, making one complete trip every 112 minutes, 4 times with 12-hour (A)-type, 6 times with 34-hour (B)-type, 8 times with 1-hour (C)type, and 10 times with 2-hour (D)-type apparatus.

(9) Raise a 45-pound weight a vertical distance of 5 feet, 30 times with 12-hour (A)-type, 45 times with 34-hour (B)-type, 60 times with 1-hour (C)-type, and 75 times with 2-hour (D)-type apparatus, consuming while doing this 2 minutes with 1/2-hour (A)-type, 3 minutes with 34-hour (B)-type, 4 minutes with 1-hour (C) type, and 5 minutes with 2-hour (D)-type apparatus.

(10) Allow 2 minutes for taking air samples and temperature readings.

(11) Walk, at a rate of not less than 3 miles per hour, 2 minutes with 1/2-hour (A)-type, 3 minutes with 34-hour (B)-type, 4 minutes with 1-hour (C)-type, and 8 minutes with 2-hour (D)-type apparatus.

(12) Raise a 45-pound weight a vertical distance of 5 feet, 30 times with 1/2-hour (A)-type, 45 times with 34-hour (B)-type, 60 times with 1-hour (C)-type, and 75 times with 2-hour (D)-type apparatus, consuming while doing this 2 minutes with 12-hour (A)-type, 3 minutes with 34-hour (B)-type, 4 minutes with 1-hour (C)-type, and 5 minutes with 2-hour (D)-type apparatus.

(13) Walk, at a rate of not less than 3 miles per hour, for 4 minutes with 12-hour (A)-type, 7 minutes with 34-hour (B)-type, 10 minutes with 1-hour (Ć)-type, and 15 minutes with 2-hour' (Ď5-type apparatus, taking air samples and temperature readings at end of 12-hour (A)-type, 34-hour (B)-type, and 1-hour (C)-type apparatus tests, and allowing 2 minutes for same purpose with 2-hour (D)type apparatus tests.

(14) Continue tests with 2-hour (D)-type apparatus by walking at a rate of not less than 3 miles per hour, for 28 minutes, taking air samples and temperature readings at end of test.

(h) Tests 13 and 14. These tests will be repetitions of test 12.

(i) Test 15. This test will be made to determine the maximum length of time that the apparatus will supply the needs of the wearer when in a quiescent state. The wearer will remain as far as possible

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in a sitting posture throughout the test and perform no work. He will be allowed to manipulate the devices controlling the oxygen supply to conserve such oxygen supply to the greatest advantage.

At the end of each air-sampling period 2 minutes shall be allowed for taking of air samples and temperature readings.*1

11.8 Preliminary test or inspection of breathing apparatus. Self-contained oxygen breathing apparatus in course of development may be submitted by manufacturers and inventors for preliminary test or inspection to ascertain defective construction or misapplication of safety principles. The nature of such tests or inspection will be determined by the Bureau's engineer in charge of testing such ap

11.9 Approval plates for self-contained oxygen breathing apparatus. The manufacturers of types of self-contained oxygen breathing apparatus that have passed the test of the Bureau will be required to attach to each apparatus a plate containing the following inscription:

PERMISSIBLE OXYGEN BREATHING APPARATUS,

paratus.**

UNITED STATES BUREAU OF MINES

APPROVAL NO.

The use of the plate will not be required if the same inspection is stamped or cast into the metal of the apparatus.*i

11.10 Notification to manufacturer. As soon as the testing engineer of the Bureau of Mines is satisfied that a self-contained oxygen breathing apparatus has passed in a satisfactory manner all the tests herein set forth the manufacturer or inventor shall be formally notified to that effect.

When two or more applications for tests on different apparatus are received within a period of 10 days, the announcement of approval for each shall not exceed the interval of time between the receipt of the applications.

When a manufacturer or inventor receives this formal notification he shall be free to advertise this type of successfully tested self-contained oxygen breathing apparatus as permissible according to the Bureau of Mines standards and may attach approval plates to this type of breathing apparatus.**

11.11 Scope of approval. The listing by the Bureau of Mines, as permissible, of any self-contained oxygen breathing apparatus shall be construed as applying only to apparatus of that specific type, class, form, and rating, made by the same manufacturer, which has the same construction in all details directly or indirectly affecting the safety features of the apparatus.

Manufacturers shall, before claiming the Bureau's approval for any modification of a permissible self-contained oxygen breathing apparatus, submit to the Bureau drawings or parts that shall show the extent and nature of such modifications, that the Bureau may decide whether test of the remodeled apparatus will be necessary for approval. If it is decided by the Bureau that testing of the remodeled apparatus is necessary, the word "permissible" shall not be used on the remodeled apparatus until it has again passed the

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**For statutory and source citations, see note to § 11.0.

complete schedule of tests or such part of these tests as the Bureau's engineer in charge of the tests shall deem necessary.**

11.12 Withdrawal of approval. The Bureau reserves the right to rescind for cause, at any time, any approval granted under the conditions herein set forth.” Cause for rescinding approval shall be the use of the Bureau's issuance of approval in an unauthorized manner, as placing the approval stamp on apparatus that has not been approved by the Bureau, or on apparatus certain parts of which have been altered in construction or material without submittal to the Bureau for test; failure of the apparatus or of any part or parts in safeguarding wearers may also be cause for withdrawal of approval.**

11.13 Approval of regenerators for breathing apparatus. The Bureau will, on application, make separate tests, identical with the foregoing tests, of regenerators manufactured for use in connection with any oxygen breathing apparatus that has been approved by the Bureau under the provisions of this part.

Regenerators that fulfill the requirements of the foregoing tests will be approved for use only in connection with that particular type of apparatus for which they are designed and which has previously received the Bureau's approval.**

11.14 Fees for testing oxygen breathing apparatus. Careful consideration has been given the necessary expenses involved in testing oxygen breathing apparatus at the Pittsburgh Experiment Station of the Bureau. The following schedule of fees to cover expenses to be charged has been established and approved by the Secretary of the Interior, in accordance with the provisions of the statute previously quoted: Complete 2-hour oxygen breathing apparatus inspection and tests_

$500 Complete 1-hour oxygen breathing apparatus inspection and tests.

400 Complete 34-hour oxygen breathing apparatus inspection and tests.

350 Complete 12-hour oxygen breathing apparatus inspection and tests_

300 Separate preliminary 2-hour apparatus inspection and tests--

150 Separate preliminary 1-hour apparatus inspection and tests.

100 Separate preliminary 34-hour apparatus inspection and tests.

85 Separate preliminary 12-hour apparatus inspection and tests_

75 Separate regenerator 2-hour apparatus inspection and tests.

100 Separate regenerator 1-hour apparatus inspection and tests_

75 Separate regenerator 34-hour apparatus inspection and tests_

60 Separate regenerator 12-hour apparatus inspection and tests.

50 Special reducing valve inspection and tests, all models_

75 Separate auxiliary parts inspection and tests, each part

50 Extension of approval on any type apparatus will depend on number of changes made and amount of work involved in making necessary tests.

The fees specified above may be increased to cover the cost of testing an unusually complicated type of oxygen breathing apparatus, and are also subject to change upon the recommendation of the Director of the Bureau of Mines and the approval of the Secretary of the Interior.**

11.15 Synopsis of procedure to be followed in making application for tests. (a) Application for tests should be addressed to the

**For statutory and source citations, see note to § 11.0.

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Director of the Bureau of Mines, Washington, D. C. This application must be accompanied by check or draft (see schedule of fees in § 11.14) made payable to the Treasurer of the United States; it should also be accompanied by a complete written description of the oxygen breathing apparatus to be tested, and a set of the drawings, as specified in § 11.3 (a), marked "Drawings of Approved Oxygen Breathing Apparatus To Be Filed.” Duplicate copies of the application and drawings should be sent to the engineer in charge of testing self-contained oxygen breathing apparatus, Bureau of Mines, Pittsburgh, Pa.

(b) As soon as the application is received by the Bureau's engineer in charge of testing self-contained oxygen breathing apparatus, the applicant will be notified of the date the tests will begin.

(c) After the applicant has received this notification, he should send the material required to the engineer in charge of testing selfcontained oxygen breathing apparatus, Bureau of Mines, Pittsburgh, Pa. This material should be delivered not less than 1 week in advance of the date set for the beginning of the tests.

(d) The tests will begin on the date set and continue until the oxygen breathing apparatus has been approved, rejected, or withdrawn.

(e) After the Bureau's testing engineers have considered the results of the tests, a formal report of the approval or disapproval of the self-contained oxygen breathing apparatus will be made to the applicant in writing by the Director of the Bureau of Mines. No verbal report will be made, and the details of the test will be regarded as confidential by all present.**

PART 12-SUPPLIED-AIR RESPIRATORS

Sec.

Sec.
12.0 Compliance with the require- 12.9 Date for conducting tests.

ments necessary for obtaining 12.10 Witnesses.
approval.

12.11 Notification to manufacturer of 12.1 Preliminary statement.

approval or disapproval. 12.2 Definition of a permissible sup- 12.12 Requirements for approval. plied-air respirator.

12.13 Requirements and tests. 12.3 Types of supplied-air respirators. 12.14 Changing details of tests. 12.4 Instructions for submitting equip- 12.15 Approval letter.

ment and conditions under 12.16 Wording of approval plate and which respirators will be tested.

label. 12.5 Fees for testing supplied-air res- 12.17 Purpose of approval plate and pirators.

label. 12.6 Drawings and specifications re- 12.18 Withdrawal of approval. quired.

12.19 Changes in design subsequent to 12.7 Control-test requirements.

approval. 12.8 Material required for approval 12.20 Material required for Bureau of testing.

Mines record.

CROSS REFERENCE

Geological Survey regulations relating to first-aid equipment and mine rescue apparatus: See 88 211.101–211.106.

Section 12.0 Compliance with the requirements necessary for obtaining approval. "To receive approval of the Bureau of Mines

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**For statutory and source citations, see note to 8 11.0.

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