Ukusetshenziswa komshini wokubala wepayipi wezibalo kukuvumela ukuthi uthole ukuthi hlobo luni lomthamo wokuthutha oludingekayo ukuthutha impahla ethengiwe, kanye nezindleko zokukhiqiza. Ngaphezu kwalokho, ubukhulu bemitha yokugijima yepayipi kufanele kwaziwe ngokubala kwezakhiwo zensimbi.
Imingcele eyinhloko yamapayipi ayindilinga yilezi:
- ububanzi bangaphandle;
- ukujiya kodonga;
- ubude.
Ukubala isisindo sombhobho, kuyadingeka ukukhombisa impahla yokukhiqiza kanye nobukhulu bayo: ububanzi, ubukhulu bodonga kanye nobude obuphelele (L). Uma ungashintshi inani lobude obungu-1 m osethiwe kusibali, khona-ke sizothola isisindo semitha egijima yepayipi eliyindilinga.
Isisindo sepayipi sibalwa nge-calculator ngokusebenzisa ifomula:
m =p×ρ×t×(D-t)×L
kuphi:
- π - 3,14;
- ρ ukuminyana kwezinto;
- t ukujiya kodonga;
- D ububanzi obungaphandle;
- L ubude bepayipi.
I-calculator ibala ubukhulu bepayipi ngodonga nobubanzi, kanye nempahla yokukhiqiza. Uma ukhetha i-polypropylene ohlwini lokudonsela phansi, kusetshenziswa inani elilinganiselwe le-gravity elingu-950 kg/m.3 zalezi zinhlobo zamapulasitiki.