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What are the best practices to check leaks from flanges? As soap solution is commonly used, what are the specifications of the soap? Any specific brand?
16/10/2020 A: ARNAB GUPTA, Kuwait Oil Company, arnabgupta_2000@yahoo.com
The question is generic in nature and I suggest refer ASME Sec V Article 10 on Leak Testing

I feel there's no specific brand that can be suggested but it is upto the user to select considering "suit to site". One point to consider is the temperature of the applied surface and the amount of froth(bubble) generated, it should not impair visibility.