974

LAWS OF MARYLAND

[Ch. 4

PLACES WHERE EQUIPMENT PASSES OVER,
UNDER, OR ADJACENT TO THEM AND SHALL
NOT BE HANDLED OR REPAIRED WHEN AIR
PRESSURE IS IN THE LINE.

RULE 6 - AIR LINES SHALL BE EXAMINED
PERIODICALLY FOR KINKS OR OTHER
WEAKNESSES AND REPLACED IMMEDIATELY
WHEN ANY DEFECT IS FOUND.

RULE 7 - COPPER TUBING SHALL BE COILED AND
UNCOILED PROPERLY. THE PART OF THE
TUBING AFFECTED BY FREQUENT COILING
AND UNCOILING SHALL BE RENEWED
PERIODICALLY BECAUSE OF THE DANGERS
FROM KINKS AND CRYSTALLIZATION.

RULE 8 - BLOW-DOWN VALVES SHALL NOT BE LESS
THAN 45 FEET FROM THE FACE AND SHALL
BE AROUND A RIGHT ANGLE.

RULE 9 - ANY HOLE FOP AN AIRDOX TUBE
NOT BE ON THE SOLID.

SHALL

RULE 10 - THE AIRDOX TUBE SHALL BE PUSHED
TO THE BACK OF THE DRILL HOLE AND
THEN WITHDRAWN SIX TO 12 INCHES TO
FORM AN AIR CUSHION.

RULE 11 - IF A BLOW-DOWN VALVE IS OPENED TO
DISCHARGE THE AIRDOX TUBE, IT SHALL
REMAIN OPEN UNTIL IT IS TIME TO PLACE
THE TUBE IN THE NEXT BOREHOLE.

RULE 12 - AFTER THE BREAKING DOWN OF THE
COAL IN ANY ONE PLACE, THE TUBE SHALL
BE DISCONNECTED IMMEDIATELY FROM THE
AIR LINE AND NOT RECONNECTED UNTIL IT
IS READY TO BE USED IN THE NEXT
PLACE.

RULE 13 - WHEN AN AIRDOX TUBE FAILS TO
DISCHARGE, THE LINE LEADING TO THE
TUBE SHALL BE DISCONNECTED AT THE
BLOW-DOWN VALVE AND THE TUBE DRAGGED
BY MEANS OF THE LINE TO AN ABANDONED
PLACE, MASKED WITH WARNING SIGNS, AND
LEFT FOR 12 HOURS BEFORE ANY REPAIR
WORK IS DONE.

RULE 14

- EVERY PERSON SHALL BE REMOVED