本技术信息文件（TIP）涵盖了为新设备或更换设备生产的新吸辊外壳的液体渗透检测。该尖端专门用于离心铸造壳体，但也可用于测试轧制、焊接或锻造的吸力辊壳体。人们已经认识到，没有一个吸力辊壳是完美的，在不同的应用和操作条件下，吸力辊壳可能会退化。因此，本技巧的目的是建立记录吸油辊壳体制造时表面状况的程序，以便将信息与壳体使用后定期收集的数据进行比较。 该程序通常用于不锈钢壳体，但也可用于青铜壳体。根据缺陷的大小或数量建议新壳体的拒收标准超出了本技巧的范围。然而，制造商通常会制定其生产的壳体的验收/拒收标准。

This Technical Information Paper (TIP) covers liquid penetrant testing of new suction roll shells produced for new or replacement equipment. This TIP is specifically intended for centrifugally cast shells, but may be adapted for testing rolled and welded or forged suction roll shells.It is recognized that no suction roll shell is perfect and shells can deteriorate under widely different applications and operating conditions. Therefore, the purpose of this TIP is to establish procedures for documenting the surface condition of the suction roll shell, as manufactured, so that the information may be compared with data gathered periodically after the shell is in service. The procedure will normally be used for stainless steel shells, but may be used for bronze shells.It is beyond the scope of this TIP to recommend criteria for rejection of new shells based on the size or quantity of flaws. However, manufacturers will usually have standards for acceptance/rejection of shells that they produce.