Tetakirere pūrerehua flange ruahe takirere pūrerehua noho pakari me ngā flange whakauru i hangaia ki ngā pito e rua, e taea ai te hononga tika ki te paipa me te kore he urutau tāpiri. Pērā i ngā takirere pūrerehua noho pakari katoa, he takirere huri-hauwhā: he kōpae porowhita e mau ana ki waenganui o te tinana hei tikanga kati, e hono ana ki tētahi kaiwhakahaere, ki tētahi kakau rānei mā tētahi pou pokapū. Mā te hurihanga 90-tohu katoa ka whakatuwhera, ka kati rānei i te takirere mōratonga wehe.

Ina kore te kōpae e huri ki te hauwhā-huringa katoa, ka tuwhera ā-wāhanga te takirere — ka taea ai te tikate whakahaere rerei ngā koki whakatuwheratanga rerekē. Kua whakamomonatia katoatia te nohoanga rapa ki runga i te tinana, kia tika ai te hiri rua-ahunga puta noa i te whānuitanga rahi katoa, tae atu ki ngā mahi uauangā tikanga mahi korehau.

Kua hangaia ngā takirere pūrerehua āpiti rua o Nortech me te whānuitanga roa e tūhono ana ki te mata ki te mata e ai ki te EN 558-1 Raupapa 13, e pai ai mō te whānuitanga o ngā tono whānui me ngā tono taumaha tae atu ki ngā whatunga tohatoha wai, ngā tipu maimoatanga wai, ngā tāhuna, ngā tipu hiko, me ngā pūnaha paipa whānui. Ka taea te whakamahi i te takirere hei takirere wehe, hei taputapu tuku wai i te pito o te paipa, hei taputapu whakahaere rere rānei. Mō ngā paipa whānui, ko te whirihoranga āpiti rua te whiringa paerewa.