Awọn oludena afẹfẹ iyipo ti fi sori ẹrọ lori oke BOP anular.Lakoko awọn iṣẹ liluho ti ko ni iwọntunwọnsi ati awọn iṣẹ liluho titẹ miiran, o ṣe iranṣẹ idi ti yiyi ṣiṣan nipasẹ lilẹ okun lilu yiyi.Nigba lilo ni apapo pẹlu liluho BOP, lu okun ṣayẹwo falifu, epo-gas separators, ati snubbing sipo, o faye gba fun ailewu pressurized liluho ati snubbing mosi.O ṣe ipa pataki ninu awọn iṣẹ pataki gẹgẹbi idasile epo kekere-titẹ ati awọn ipele gaasi, liluho-ẹri jijo, liluho afẹfẹ, ati snubbing awọn atunṣe daradara.