API mai kaskon maibututun karfe ne da ake amfani da shi don tallafawa bangon rijiyoyin mai da iskar gas don tabbatar da aikin rijiyar mai gaba daya a lokacin aikin hakowa da kuma bayan kammalawa.

Gwajin matsin lamba na hydrostatic na bututun casing wani muhimmin sashi ne na aikin samar da bututun ƙarfe. Matsayinsa shine gwada aikin hana zubar da ruwa na bututun ƙarfe a ƙarƙashin daidaitaccen gwajin gwaji da lokacin ƙa'ida. Kamar radiyo, ultrasonics, da sauran fasahohin gano aibi, hanya ce mai mahimmanci ta gwada ingancin bututun ƙarfe gabaɗaya.

Shahararriyar bayanin ita ce cika bututu da ruwa kuma gwada ikonsa don kula da ƙayyadaddun matsa lamba ba tare da yaduwa ko karya a ƙarƙashin matsin lamba ba. Ayyukansa sun haɗa da matakai guda uku: gogewa, gwajin matsa lamba da sarrafa ruwa.

API 5CT misali don gwajin matsa lamba na hydrostatic:

1. The hydrostatic matsa lamba gwajin darajar hada biyu da threaded bututu ne mafi ƙasƙanci darajar na hydrostatic gwajin matsa lamba na lebur karshen bututu, matsakaicin hydrostatic matsa lamba gwajin matsa lamba na hada biyu, da kuma ciki matsa lamba yayyo juriya, amma misali matsakaicin matsa lamba ne. 69MPa kuma an ƙididdige matsa lamba. Ana zagayawa ƙimar gabaɗaya zuwa 0.5 MPa mafi kusa.
2. Dangane da buƙatun API, yakamata a daidaita na'urar gwajin gwajin hydrostatic a cikin watanni 4 kafin kowane amfani.
3. Idan abokin ciniki yana da buƙatu na musamman, za'a iya zaɓar matsa lamba mafi girma.
4. Gwajin matsin lamba na Hydrostatic Leakage shine tushen ƙin yarda.
5. Sai dai in ba haka ba an yarda tsakanin mai siye da masu sana'a, ba a buƙatar gwajin matsa lamba na hydrostatic don haɗawa blanks, kayan haɗin kai, kayan da ke kusa, ko Q125 karfen katako na katako.