From the perspective of convex pipe stress in the cap from hemispherical tubecap.
从受力角度看凸形管帽中从半球形管帽。
2
Tubecap in the situation of low pressure, remove maintenance, high pressure situation general don't tubecap.
用管帽一般在压力较低的情况下，便于拆卸检修，高中压情况下一般不用管帽。
3
Cover in the specific operation tubecap generated during the important role and contribution to the use of specific important changes and performance, the use of good performance.