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310 Advanced Mine Ventilation

2. An orifice flange should be incorporated to measure any change in flow.
3. A check valve should be used to avoid air entry in the pipeline.
4. A flame arrestor should be used and be located about 10 ft from the top.
5. A rain top should be used in the stack.
6. Lightning protection should be provided by erecting a pole higher than the gas stack.
7. The area must be fenced and posted for “No Smoking”.

18.8 A Typical Application for Mine Safety and Health
Administration Approval of a Gas Pipeline System

The following is an example of an application to Mine Safety and Health Administra-
tion for the approval of gas pipeline construction.
District Manager
Mine Safety and Health Administration
Coal Mine Safety and Health District
Street address
City, State Zip
Dear Mr. Manager:
The attached material describes part of a methane control project at 123 Section of
ABC Mine. Our objective is to degas the mains and the gate roads in advance of
mining as shown in the enclosed map. The long boreholes in the longwall panels
will be adequately filled up with cement prior to mining through them. This proced-
ure has proved satisfactory at other mines.
The degasification work will be done in accordance with the enclosed guideline that
has been established earlier in collaboration with your staff.
Your approval of the project will be appreciated.
Yours very truly,
Mine Executive
`````````````````````````````````````````````````````````````````````````````````````````````````````
PROPOSED GAS PIPELINE SYSTEM.
UNDERGROUND & SURFACE.
ABC MINE.
XYZ COAL COMPANY.
The following material describes the equipment and the installation method pro-
posed for a coal seam degasification system in ABC Mine. Schematic diagrams of
the system and ventilation map of the immediate area underground are attached
(Figs. 18.1 and 18.2).

1. Pipeline: Underground methane pipeline will be made of well-designed plastic or steel.
1 00 1 00
a. All underground steel pipelines will be 3 / 2 to 4 / 2 OD Schedule 40 pipes joined
together with threaded couplings. These pipes will be made up tightly using a good
grade of thread lubricant. Mill collars will be broken out, doped, and remade. A flange