Mepụta nsụgharị dị mgbagwoju anya nke ahịrịokwu a Enwere ike ibufe cylinders ndị e mepụtara na mpụga USA n'okpuru ikike pụrụ iche (ntọhapụ) nke Pipeline and Hazardous Materials Safety Administration nyere.
N'ezie, nsụgharị dị mgbagwoju anya nke ahịrịokwu ahụ bụ "A pụrụ ibufe cylinders ndị e mepụtara na mpụga USA n'okpuru ikike pụrụ iche, ndị a enyela maka ígwè siri ike na ihe ndị mejupụtara cylinders na nrụgide ọrụ nke ihe ruru 300 bar (4400 psi) site n'aka ọtụtụ ndị na-emepụta ihe. "