Tilmaamaha ASTM A320 Fasalka L7 wuxuu dabooshaa alaabta birta ah ee birta ah ee adeega heerkulka hooseeya. Daboolka caadiga ah ayaa la giringiriyey, la been abuurtay, ama diiqaday baararka engegan, boolal, boolal, biraha, iyo boolasha ulaha loo isticmaalo weelasha cadaadiska, valves, flanges, iyo qalabyada.