Iiprojekthi ezinkulu zamanzi ezidayamitha ezinkulu zihlala zifuna amacandelo emibhobho enomthamo ophezulu wokuhamba kunye neendleko ezisebenzayo zemveliso. Umbhobho odityanisiweyo weSpiral usetyenziswa kubonelelo lwamanzi amaninzi, kugutyulo, ukucocwa kwelindle, ukunkcenkceshela, kunye neeprojekthi zokwakha zikamasipala. Imathiriyeli yereferensi ichaza ukuba umbhobho omkhulu ojikelezayo uqhele ukuba ngaphezulu kwemitha e-1 ububanzi, kwaye umbhobho we-DN2500 unokuba nedayamitha yokwenyani yangaphandle phakathi kwe-2500 kunye ne-2520 mm. Ubukhulu bendonga bunokuvela kwi-8 mm ukuya kwi-25 mm okanye ngaphezulu.
Indlela yokuvelisa iqala ngentsimbi yentsimbi. Umtya ulungelelaniswe, unqunywe, kwaye uqulunqwe ngama-roller, kwaye i-gap ye-weld ilawulwa phambi kwe-welding. Ukuwelda -kabini, -kwamacala amabini antywiliselwe i-arc inceda ukukhusela i-seam. Kumbhobho omkhulu, uhlolo lwe-weld lubalulekile kuba umthungo omde uhamba kuwo onke amacandelo ombhobho. Uvavanyo lwe-ultrasonic kwi-Intanethi kunye novavanyo loxinzelelo lunokubandakanywa ngokweprojekthi.
Ngomgca wamanzi, umthengi kufuneka aqinisekise ngaphakathi ngaphakathi, ubukhulu bodonga, ubude, imathiriyeli yentsimbi, imfuno yokwambathisa, kunye nefom yokuphela. Eminye imigca ifuna amandla othutho kuphela, ngelixa eminye ifuna i-anti{1}}i-corrosion coating okanye ukhuseleko lwangaphakathi. Ukuba umbhobho uya kusetyenziswa kwindlela yokungcwaba, imeko yomhlaba kunye nonyango oludibeneyo kufuneka luqwalaselwe phambi kokuveliswa kokugqibela.
