_GENERAL DOCUMENTS - C1981017 (252)

Home Browse Search

'Surface Flammability of Materials Using a Radiant Heat Energy Source. " (b) A sampling pipe or pipes shall be installed in each set of seals for a worked-out area. Each pipe shall— (1) Extend into the sealed area a sufficient distance (at least 15 feet) to obtain a representative sample from behind the seal; (2) Be equipped with a cap or shut-off valve; and (3) Be installed with the sampling end of the pipe about 12 inches from the roof. (c) (1) A corrosion-resistant water pipe or pipes shall be installed in seals at the low points of the area being sealed and at all other locations necessary when water accumulation within the sealed area is possible; and (2) Each water pipe shall have a water trap installed on the outby side of the seal. 2 . Be reminded that if the drill and shoot method of sealing the portals is used, examinations must be made after completion of the shot to ensure that the portal is appropriately sealed. Past experience has shown that using this method of sealing only moves the mine opening higher in elevation (particularly in areas with sandstone roof and/or cliffs) and increases the difficulty in properly sealing the opening. 3 . Be reminded that permanent roof support removal shall follow the requirements outlined in 30 CFR § 75. 213, which states, in pertinent part, that: § 75.213 Roof support removal. (a) (1) All persons who perform the work of removing permanent roof supports shall be supervised by a management person experienced in removing roof supports. (2) Only persons with at least one year of underground mining experience shall perform permanent roof support removal work (b) Prior to the removal of permanent roof supports, the person supervising roof support removal in accordance with paragraph (a)(1) of this section shall examine the roof conditions in the area where the supports are to be removed and designate each support to be removed. (c) (1) Except as provided in paragraph (g) of this section,prior to the removal of permanent supports, a row of temporary supports on no more than 5 foot centers or equivalent support shall be installed across the opening within 4 feet of the supports being removed. Additional supports shall be installed where necessary to assure safe removal.