1020 tuubo bir ah oo caadi ah 20 # tuubo bir ah oo aan kala go 'lahayn
Sharaxaad Gaaban:
Beebka Heerka Ameerikaan waa qayb godan, oo aan lahayn kala-goysyada birta dheer.
ASTM A 53 GR., Dhuumaha Birta Caadiga ah.Tuubooyinka birta ah ee B ee isticmaalka guud, ASTM A106/A53 G. B tuubooyinka birta chamfered, BS 1387-1985 erw erw inta jeer ee tuubooyinka alxanka iyo tuubooyinka galvanized, ASTM A333-40 °c-101 °c heerkulka hoose tuubooyinka aan si fiican u lahayn., ASTM a 179 tuubbo bir ah oo aan bilaa lahayn oo loogu talagalay beddelayaasha kulaylka iyo qaboojiyeyaasha.Dhererka tuubada birta: 5.8 M, 6 M, iyo ilaa 12 m, sidoo kale iyadoo loo eegayo baahida isticmaale.Dhexroorka dibadda ee alaabtu waa 1/2 "-28", 21.3-711.2 mm, dhumucdiisuna waxay tahay SCH30, SCH40, STD, XS, SCH80, Sch160, XXS iwm.Dhuumaha aan cillad lahayn marka loo eego shuruudaha waxay noqon kartaa daawaynta ka-hortagga daxalka, labaduba waxay ku dhammaadaan koofiyadaha caagagga ah, waxaa loo jeexjeexi karaa si waafaqsan shuruudaha, waxayna xamili kartaa kormeerka badeecadaha.
