Sida aan ognahay, astm a234 tuubbooyinka tuubbada birta waxaa loo isticmaalaa tuubbada cadaadiska iyo wasakhda weelka weelka ah, ee loogu talagalay adeegyada heerkulka dhexdhexaadka ah ee dhexdhexaadka ah. Qalabka ku jira ee heerkulkan wuxuu ka kooban yahay bir bir ah, caloosha, baararka, taarikada, badeecadaha tuubbada tuubbada leh ee tuubbada leh ee birta ku daray.