“Don’t clamp it,” Marina said, opening the PDF again. “I’m looking at SP0170 right now.”
| Mitigation Strategy | Description | How it Works | | :--- | :--- | :--- | | | Choosing materials resistant to sensitization and implementing appropriate fabrication practices. | An assessment of the risk of PTA SCC is conducted. If the risk is judged acceptable, other mitigation methods may not be required. | | 2. Nitrogen Purging | Flowing an inert gas, specifically dry nitrogen, through the equipment. | This technique excludes oxygen, one of the key components needed for PTA formation, thus preventing the acid from ever developing. | | 3. Alkaline Washing | Washing the equipment with a soda ash (sodium carbonate) or other alkaline solution. | The alkaline solution neutralizes any PTA that may have already formed, rendering it harmless to the metal. | | 4. Dehumidification | Using dehumidified air to maintain a very low relative humidity within the equipment. | This method removes moisture, another critical element for PTA formation, thereby preventing the reaction from occurring. |
If the equipment does not need to be opened for internal inspection or maintenance, the simplest and most effective strategy is to exclude oxygen completely.
If you fall into one of the following categories, keeping a copy of NACE SP0170 handy is essential:
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“Don’t clamp it,” Marina said, opening the PDF again. “I’m looking at SP0170 right now.”
| Mitigation Strategy | Description | How it Works | | :--- | :--- | :--- | | | Choosing materials resistant to sensitization and implementing appropriate fabrication practices. | An assessment of the risk of PTA SCC is conducted. If the risk is judged acceptable, other mitigation methods may not be required. | | 2. Nitrogen Purging | Flowing an inert gas, specifically dry nitrogen, through the equipment. | This technique excludes oxygen, one of the key components needed for PTA formation, thus preventing the acid from ever developing. | | 3. Alkaline Washing | Washing the equipment with a soda ash (sodium carbonate) or other alkaline solution. | The alkaline solution neutralizes any PTA that may have already formed, rendering it harmless to the metal. | | 4. Dehumidification | Using dehumidified air to maintain a very low relative humidity within the equipment. | This method removes moisture, another critical element for PTA formation, thereby preventing the reaction from occurring. | nace sp0170 pdf
If the equipment does not need to be opened for internal inspection or maintenance, the simplest and most effective strategy is to exclude oxygen completely. “Don’t clamp it,” Marina said, opening the PDF again
If you fall into one of the following categories, keeping a copy of NACE SP0170 handy is essential: If the risk is judged acceptable, other mitigation