423 We can carry out various treatment for the inner surface of pipes, such as sanding , chemical pickling, purging and passivation.
423 We can carry out various treatment for the inner surface of pipes, such as sanding , chemical pickling, purging and passivation.
我们可以进行管子内壁的各种处理，诸如：喷砂、化学酸洗、冲洗和钝化。