The project of hole releasing adopted can form a protection shell with low earth stress and fuel gas pressure around the shaft, and the outburst was prevented effectively and economically.
采用钻孔释放方案，在井筒周围形成一个低地应力、低油气压力保护壳，能经济有效地预防突出。
It is suggested that the oblique-cut semi-cylinder shell is a kind of VGs with efficient heat transfer enhancement but low pressure drop.
结果表明：斜截半柱面涡流发生器是一种强化换热效果好又阻力损失小的涡流发生器型式。
With its factory in Foundry: low pressure casting, metal-type gravity casting, shell coated sand casting and sand casting;
本厂在铸造方面具备：低压铸造、金属型重力铸造、覆膜砂壳型铸造和砂型铸造；
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