An (ammonia regulation) can be revised.Logical formLearned from2 sentences. (Ammonia systems/processes) can be anhydrous.Logical formLearned from2 sentences. Standards may cover (ammonia systems).Logical formLearned from2 sentences. A (vent pipe) may be removed from an (ammonia line).Logical formLearned from2 sentences. (Ammonia facilities) can be anhydrous.Logical formLearned from2 sentences. An ammonia may be discharged through an opening.Logical formLearned from2 sentences. A valve may stop a flow of liquid ammonia.Logical formLearned from2 sentences. Liquid ammonia may undergo a flow.Logical formLearned from2 sentences. A diameter may pertain-to a liquid ammonia.Logical formLearned from2 sentences. Anhydrous ammonia can be as a (grain fumigant).Logical formLearned from2 sentences. Anhydrous ammonia may be used as a (grain fumigant) by some (grain shippers).Logical formLearned from2 sentences. (Ventilation requirements) can be for (ammonia machinery rooms).Logical formLearned from2 sentences. An (ammonia borane) can be compound.Logical formLearned from2 sentences. Exposure to ammonia may interfere with olfactory perception.Logical formLearned from2 sentences. An atmosphere may contain some parts (ammonia gas).Logical formLearned from2 sentences.