However, for attaching nonpressure parts to pressure parts, the filler metal chemistry shall match the nominal chemistry of the pressure part. 但將非受壓元件焊接受壓元件時(shí)所用的填充金屬，應與受壓元件的標稱(chēng)化學(xué)組成相配。
In these cases orifice plates or other differential pressure producing elements with differential pressure transmitters shall be considered. 在這種情況下，應使用流量孔板或配有差壓變送器的其它差壓元件。
