Ka sokow kala-soociddan ugu weyn, waxaa jiri kara noocyo kale oo tuubooyin naxaas ah oo loo adeegsado nidaamyada qaboojinta ee hawada, sida khadadka qaboojiyaha ee isku xirka qaybaha kaladuwan, khadadka bullaacadda ka soo baxa ka saarida, iyo khadadka soo celinta qaboojiyaha. Tuubooyinkaani waxay ku kala duwanaan karaan cabirka, xajmiga, iyo howlo gaar ah oo ka dhex jira nidaamka qaboojinta.
Tuubbada birta