Yin amfani da ƙididdiga na bututu don ƙididdigewa yana ba ku damar gano irin nau'in ƙarfin da ake buƙata don jigilar kayan da aka saya, da kuma farashin samarwa. Bugu da ƙari, yawan mita mai gudu na bututu dole ne a san shi don ƙididdige tsarin ƙarfe.
Babban sigogi na zagaye bututu sune:
- diamita na waje;
- kauri bango;
- tsawon.
Don ƙididdige nauyin bututu, ya zama dole don nuna kayan aikin samarwa da girmansa: diamita, kauri na bango da tsayin duka (L). Idan ba ku canza tsawon ƙimar saiti na 1 m a cikin kalkuleta ba, to zamu sami nauyin mita mai gudu na bututu mai zagaye.
Ana ƙididdige yawan bututu ta hanyar kalkuleta ta amfani da dabara:
m = shafi×ρ×t×(D-t)×L
inda:
- π - 3,14;
- ρ shine nauyin kayan abu;
- t shine kaurin bango;
- D shine diamita na waje;
- L shine tsayin bututu.
Kalkuleta yana ƙididdige yawan bututu ta bango da diamita, da kuma kayan aikin samarwa. Lokacin zabar polypropylene daga lissafin da aka saukar, ana amfani da matsakaicin takamaiman ƙimar nauyi na 950 kg/m.3 don irin waɗannan nau'ikan robobi.