My vendor is offering the Body Gas test as per API 6A PSL 3G in which the method to detect the leak is by sniffing probes over the areas of leakage suspected. but in case of API 6A referring the Test shall be conducted in submerged water bath .whether the method suggested by my vendor is acceptable.
API-6A states to test the equipment completely submerged in a water bath. Testing a  gate valve using nitrogen without being submerged in a water bath is dangerous.

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