In other cases, it is several years before rouging is observed.

在其他情况下，若干年后才能观察到生锈。

In some cases, the rouging appears as quickly as a month or two after system start up.

在某些情况下，系统启动后一两个月就会生锈。

Rouging would seem to be very site (facility) specific because of the variety in appearance and texture.

水锈似乎是位点（装置）特异性的，因为它有各种形态和结构。

The FDA has no written position addressing rouging, its existence, or presence in high temperature high purity water clean steam systems.

FDA还没有书面讨论生锈及其存在方式，或在高温高纯水清洁系统中的存在。