Balaadhinta kulaylka ee tuubada birta ah ee aan xuduudka lahayn ayaa ah waxa aynu inta badan ugu yeedhno tuubada balaarinta kulaylka. Tuubooyinka birta ah ee cufnaanta yar leh laakiin yarayn xooggan (tuubo bir ah oo aan fiicneyn) ayaa loo tixraaci karaa tuubooyinka ballaarinta kulaylka. Habka dhamaystirka tuubada qallafsan ee adeegsata is-rog-rogid ama sawir si loo weyneeyo dhexroorka tuubada. Kordhinta dhexroorka dibadda ee tuubooyinka birta muddo gaaban gudaheed waxay soo saari kartaa noocyo aan caadi ahayn oo gaar ah oo tuubooyinka aan fiicneyn oo leh kharash yar iyo waxtarka wax soo saarka sare. Tani waa isbeddelka horumarka ee duurka ku-wareejinta dhuumaha caalamiga ah.

Kuleylka balaariyay tuubo bir ah oo aan kala go 'lahayn: GB/T3087-2018
Dhuumaha birta balaadhinta kulaylka (tuubo bir ah oo aan lahayn): GB / T3091-2018.
Heerarka wax soo saarka tuubooyinka balaadhinta kulaylka ee waddankayga hadda: ballaadhinta kulaylka ee tuubada birta ah ee aan kala go'a lahayn: GB/T3087-2018

Dhuumaha dhexroorka weyn, dhuunta birta ah, tuubo bir ah oo kulul, tuubo fidsan
Kuleyliyeyaasha, kulaylka beddelayaasha, tuubooyinka birta ee wareega, tuubooyinka biyaha
Soo saaraha tuubooyinka birta, tolmo toosan oo laba-geesood leh, Q235, walxo Q345
Tuubooyinka gudbinta gaaska, tuubooyinka injineernimada, tuubooyinka duuban ee kulul, tuubooyinka birta ah ee aan xidhnayn (tubooyinka aan xidhnayn),
Tuubo bir ah oo tol ah oo toosan (tuubo bir ah oo tol ah oo toosan), tuubo bir ah oo kuleyl leh oo la ballaariyay, tuubo aan fiicneyn, tuubo bir ah oo koronto ah,
Tuubooyinka birta ee dhismaha, qalabka kuleyliyaha tuubooyinka birta, tuubooyinka birta qaboojiyaha kiimikada, qaboojiyaha tuubooyinka birta gaarka ah,
Dhuumaha birta ah ee spiral, tol toosan oo alxan leh, dhexroor weyn oo toosan tol laba-dhinac ah oo hoos jira, tuubo bir ah oo toosan oo tol ah
Dhuumaha gubashada kulul, tuubada alxanka leh, tuubo aan xidhnayn, dhuunta birta dheecaanka qaada, tuubada birta gudbinta gaaska, tuubada birta heerka qaranka
Balaadhinta tuubooyinka aan kala go'a lahayn, tuubo bir ah oo kulul, tuubo bir ah oo qabow-duuban