The elbow shall be bolted to the floor of the wet-well and be so designed as to receive the pump connecting flange without the need for any bolts, nuts or clamps.

• 弯头应该用螺栓固定在湿井地面，并且设计成具有不需要任何螺栓、螺母或皮带即可连接泵设备的连接法兰的能力。