Ngakho-ke irediyo ekhethiwe ye-elbow ingabaluleka kakhulu. Olunye uhlobo lwe-elbows lunciphisa ama-elbows. Kulolu hlobo lwe-elbows, ubukhulu bemisebe ye-Centre-Line Radius ilingana nengxenye yosayizi ophakeme wokuphela okukhulu. Ukunciphisa ama-elbows, futhi, gcina ushintsho lwe-90¡Ã flu flow ohlelweni lwepayipi. Ngaphezu kwalokho, ushintsho olungu-180¡Ã0Flow lungagcinwa ngokusebenzisa uhlobo oluthile lokunciphisa i-elbow ebizwa nge-¡®return bends.