[MW:31783] SSPC SP 6 - 63

Hello everyone.

I encountered a requirement from a Licensor specification that internal surface should be prepared as per SSPC SP 6 - 63 prior to refractory application.

I know SSPC SP 6 means commercial blast but I have never encountered or saw a surface preparation requirement "SP 6 - 63".

Does anyone know what this means?

Thank you in advance.

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