Qalabkan waxaa loo isticmaalaa tuubada saxda ah / tuubada xawaaraha sare ee xawaaraha sareynta, saxnaanta xakamaynta vacuum +/- 0.1Kpa, shahaadada vacuum si toos ah ayaa loo hagaajin karaa.
Isticmaalaha dhamaadka-isticmaalka wuxuu dooran karaa 4m/6m/8m dhererka haanta iyadoo loo eegayo tilmaamo kala duwan oo tuubada/tubada.
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