安装采油树是要对角上紧螺栓。
Make up and tighten the bolts diagonally when the X-tree is installed.
检查是否有泄漏，如果需要，上紧螺栓。
Check if there are leakages. If necessary tighten the bolts.
而更大的螺栓就要匹配更大的螺母，这就意味着需要直径更大的螺栓为上紧螺母创造条件。
A bigger bolt nut must match the larger, which means that larger diameter bolts need to create conditions on the tight nut.
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