All external casting surfaces of the pump / motor coming into contact with the pumped liquid shall have a surface cleanliness equal to that of a sspc - sp6 process prior to being factory protected by one ( 1 ) coat of an environmentally - safe machinery enamel coating with a high solids content 所有将会与泵吸液体接触的泵/电机外部铸件表面都应该具有符合或优于sspc - sp6标准的表面清洁功能，在出厂前就采用高度实心物质进行机械式搪瓷涂层、具有环保作用的一层涂层。
