在穿胀管前,对每张管板抽检300(大于3%)个孔,平均直径公差为+0.053mm,结果符合本次海水淡化项目钻孔精度控制目标,0.1mm内。
300 (more than 3%) holes were sampled on each tubesheet before penetrating the expansion pipe, and the average diameter tolerance was +0.053 mm, which met the drilling accuracy control target of this seawater desalination project, within 0.1 mm.