Standard Number: WJ/T 9066-2018(WJ/T9066-2018)
Chinese:煤矿许用瓦斯抽采水胶药柱
English:Hydrocolloid pillars for coal mine licensed gas extraction
Effective Date:2018-09-01
Standard Applicability:This standard applies to coal mine underground maximum charge length of not more than 80 m, sealing length of not less than 10 m, and the outer diameter of not more than 80 mm deep hole pre-cracking blasting with coal mine permitted gas extraction hydrocolloid pillars.
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