I am trying to justify the ASME B31.3 classification of Normal Fluid service for 50% NaOH. The system design gauge pressure is below 150 psi and the design temperature is ambient. Sodium Hydroxide does not produce systemic toxicity; its health effects are due to its corrosive nature. However it does have a published LD50 of 100 mg/kg (oral Rat), which by OSHA/UFC definition makes it a toxic, leading to the possible classification of category M fluid service. If anyone has experience with this and can provide a literature reference to back up either classification it would be appreciated.
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