1.1 This standard practice establishes guidelines to avoid
caustic SCC of CS refinery equipment and piping. It
addresses applications that use "fresh" caustic. Caustic
SCC has been observed in the presence of contaminated
caustic (especially contaminated with sulfide) in services
that otherwise fall within area "A"of the Caustic Soda
Service Chart shown in Figure 1.
1.2 The practices detailed below are specifically intended
for handling aqueous solutions containing sodium hydroxide
(NaOH). However, several companies extend these
practices to include aqueous solutions of other strong alkali
compounds such as potassium hydroxide (KOH) and lithium
hydroxide (LiOH).
1.3 Some proprietary caustic solutions used in the industry
(e.g., for carbon dioxide removal in hydrogen manufacturing
units) contain inhibitors that may mitigate caustic SCC. In
these cases, the practices included herein may be
conservative. The effectiveness of any inhibitors added to
industrial caustic solutions should be evaluated before the
guidelines set forth in this standard practice are
implemented.
| File Size : | 1
file
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| ISBN(s) : | 157590179X |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 9 |
| Published : | 02/11/2008 |
