Accuracy Analysis of Measuring Methane Pressure Based on Methane Content in Coal

The influence of length of pressure measurement room and methane release amount in sealing hole on measurement accuracy was analyzed on the basis of methane content in coal body.An expression of original methane pressure,measured methane pressure,length of pressure measurement room and methane release amount in sealing hole was deduced based on ideal gas state equation and Langmiur equation.Methane pressure measured was modified.Calculation showed that length of pressure measurement room was longer,release methane amount was larger in sealing hole and the error between measured methane pressure and original methane pressure was larger.So the length of pressure measurement room should be reduced as much as possible to improve hole-sealing rapid.