Kayan tambayoyi suna waɗanda yanzuwa da kwayoyin daidai, ya kamata shirin kaiyayya marin daga samarun samaruna kuma rubutun/marafa wakilin dai dai, amfani da suka yi aikin tsarin daya daya. Samarun kayan tambayoyi, mai tsaye oil tankers kuma chemical tankers, suka yi aikin samarun hanyar kasa-kasawa, da kwayoyin su ga ranar gaba da ranar gabatar gabatar ton. Rubutun kuma marafa kayan tambayoyi suka sami aikin abubuwan kasar, suka taimaka rubutun mai sauran mai, kimiya, kuma rubutun mai sauran cikin food-grade. Suna suka jihar da makama-makaman kawai, suka yi aikin bayan wannan kwayoyin. Safi-safin aiki, mai tsaye double-hulls, leak-detection systems, kuma emergency shut-off valves, suka ne kanƙara aiki na farko spill kuma suka yi aikin safi na farko kwayoyin daya daya, suka yi amfani da suka ne kanƙara don global supply chains daga samarun energy, chemicals, kuma food.