Adduunka soo jiidashada leh ee cabbirrada tuubooyinka: gaabinnada IPS, NPS, ID, DN, NB, SCH, SRL, DRL macnaheedu?
1.DN waa erey Yurub ah oo macneheedu yahay "dhexroorka caadiga ah", oo la mid ah NPS, DN waa waqtiyada NPS 25 (tusaale NPS 4=DN 4X25= DN 100).
2.NB macneheedu waa "nominal bore", aqoonsiga macneheedu waa "dhexroor gudaha ah" labaduba waa isku mid oo ah cabbirka tuubada magaca ah (NPS).
3.SRL IYO DRL( Dhererka Tuubbada)
SRL IYO DRL waa ereyo la xidhiidha dhererka tuubooyinka.SRL waxay u taagan tahay "hal random dhererka", DRL "dherer random double"
a. SRL tuubooyinka waxay leeyihiin dherer kasta oo dhab ah oo u dhexeeya 5 iyo 7 mitir (ie "random").
Tuubooyinka b.DRL waxay leeyihiin dhererka dhabta ah ee u dhexeeya 11-13 mitir.
Waqtiga boostada: Agoosto-16-2020