| 摘要 |
<p>An improved blowout preventer stack includes a plurality of ram type blowout preventers (14), an annular blowout preventer (13), and a plurality of tie rods (18) connecting the blowout preventers into a stack. The upper ends of the rods (18) are secured to the side of the upper member of the stack and the lower end of the rods are secured to the lower end of the stack with securing means (20) to maintain the preset tension in the tie rods. An improved test stump (38) is provided to supportthe stack and connect to and exert tension of the tie rods responsive to pressure supplied to the rest stump to preset the tension therein. The improved method of the present invention includes the step of assembling the components into a stack supported on the test stump, securing the tie rods to the upper member of the stack, connecting the pressure responsive means of the test stump to the lower end of the tie rods, supplying pressure to the pressure responsive means of the test stump to pretension the tie rods and tightening the securing means on the end of the tie rods to maintain the preset tension in the tie rods.</p> |
