Nws tus kheej drilling ntsia hlau yog ib qho khoom siv hauv paus, uas yog qhov xav tau zoo. Feem ntau, bolts, screws, rivets, thiab lwm yam, txhawm rau kom muaj kev nyab xeeb los yog feem ntau tsis tas yuav xav txog qhov kub thiab txias, ib puag ncig tsis zoo lossis lwm yam kev ua haujlwm txaus ntshai. Cov khoom siv feem ntau yog cov hlau tsis muaj hlau, cov hlau tsis muaj hlau thiab cov hlau tsis muaj hlau. Tab sis nyob rau hauv tshwj xeeb zaus, cov ntaub ntawv fastener yuav tsum tau raws li tej yam kev mob ntawm corrosion hnyav los yog siab zog, muaj ntau stainless hlau thiab ultra siab zog stainless hlau tshwm sim. Cov nram qab no rau 6 qhov teeb meem yuav tsum tau them nyiaj mloog thaum siv thiab tswj qhov drilling tail hlau:
1. Cov txheej txheem ntawm rinsing tus Tsov tus tw hlau yog ceev heev thiab yuav tsum tau ceev faj heev. Thaum lub sij hawm tus txheej txheem, yuav muaj residues nyob rau saum npoo ntawm lub drilling tail hlau. Cov kauj ruam no yog yaug tom qab cov tshuaj ntxuav silicate ntxuav.
2. Thaum lub sij hawm tempering, cov pawg yuav tsum tau merged, txwv tsis pub me ntsis oxidation yuav tshwm sim nyob rau hauv lub quenching roj.
3. Dawb phosphide residues yuav tshwm sim nyob rau saum npoo ntawm cov ntsia hlau muaj zog, qhia (point 1) tias kev tshuaj xyuas tsis tau ceev faj txaus thaum ua haujlwm. 4. Qhov tshwm sim blackening nyob rau saum npoo ntawm qhov chaw tsim cov tshuaj rov qab daim ntawv thov, qhia tias kev kho cua sov tsis ua tiav thiab cov alkaline residue ntawm qhov chaw tsis tau muab tshem tawm tag nrho.
5. Cov txheej txheem yuav xeb nyob rau hauv cov dej yaug, thiab cov dej siv los yaug yuav tsum tau hloov ntau zaus.
6. Kev xeb ntau dhau qhia tias cov roj quench tau siv ntev dhau lawm, thiab nws yuav tsum tau muab ntxiv lossis hloov.