Kev Paub Me Me Txog Roj Hmab Gaskets

Roj hmab gaskets feem ntau yog siv rau cov kav dej los yog cov manholes thiab tes qhov uas feem ntau dismantled, thiab lub siab tsis tshaj 1.568MPa. Ntawm txhua yam ntawm sealing gaskets, roj hmab gaskets yog softest thiab muaj kev haum zoo, thiab muaj peev xwm ua si ib tug sealing nyhuv nrog ib tug me me preload. Vim li no, thaum raug lub siab sab hauv, lub gasket yog yooj yim rau muab nyem tawm vim nws tuab los yog tsawg hardness.

Kev siv cov ntawv roj hmab hauv cov kuab tshuaj organic xws li benzene, ketone, thiab ether yog qhov ua rau o, hnyav nce, softening, thiab stickiness, ua rau lub foob tsis ua hauj lwm. Feem ntau, qhov o ntawm qhov ntau tshaj 30 feem pua ​​thiab siv tsis tau.

Nyob rau hauv rooj plaub uas tsis tshua muaj siab (tshwj xeeb tshaj yog qis dua 0.6MPa) thiab lub tshuab nqus tsev, nws tsim nyog siv cov roj hmab gaskets. Cov khoom siv roj hmab muaj zoo compactness thiab tsis tshua muaj cua permeability. Piv txwv li, fluorine roj hmab yog qhov tsim nyog tshaj plaws rau kev sib khi gaskets ntawm lub tshuab nqus tsev, thiab lub tshuab nqus tsev kawm ntawv tuaj yeem ncav cuag li 1.3 × 10-7Pa. Thaum cov roj hmab gasket siv nyob rau hauv lub tshuab nqus tsev vacuum ntawm 10-1 ~ 10-7Pa, nws yuav tsum tau muab ci thiab tag.

Tus nqi ntawm asbestos roj hmab ntawv yog qis dua li ntawm lwm cov gaskets, thiab nws yog ib qho yooj yim mus use; Qhov teeb meem loj tshaj plaws yog tias txawm tias roj hmab thiab qee cov khoom ntim tau ntxiv rau cov khoom siv sealing, nws tseem tsis tuaj yeem ua tiav cov pores me me uas sib tsoo, thiab muaj qhov nkag mus me me. Yog li ntawd, nyob rau hauv ib tug heev polluting nruab nrab, nws yuav siv tsis tau txawm tias lub siab thiab kub tsis siab. Thaum siv nyob rau hauv ib co high-temperature roj xov xwm, feem ntau nyob rau hauv lub tom ntej lub sij hawm ntawm kev siv, vim cov carbonization ntawm roj hmab thiab muab tub lim, lub zog yog txo, thiab cov khoom yuav xoob, uas yuav infiltrate lub interface thiab nyob rau hauv cov roj hmab gasket, uas yuav ua rau kom cov ntaub ntawv los ntawm cov khoom. hauv coking thiab haus luam yeeb. Tsis tas li ntawd, cov ntaub ntawv roj hmab asbestos yog ib qho yooj yim rau kev sib txuas ntawm flange sealing nto ntawm qhov kub thiab txias, uas ua rau muaj teeb meem ntau rau kev hloov cov gasket.

Nyob rau hauv lub xeev rhuab, kev siv siab ntawm cov roj hmab gasket nyob rau hauv ntau yam xov xwm nyob ntawm seb lub zog tuav npaum li cas ntawm cov khoom gasket. Cov dej crystalline thiab dej adsorbed muaj nyob hauv cov khoom siv fiber ntau asbestos. Ntawm 110 degree, 2/3 ntawm cov dej adsorbed ntawm cov fibers tau precipitated, thiab lub tensile lub zog ntawm fiber yog txo los ntawm li 10 feem pua; ntawm 368 degree, tag nrho cov dej adsorbed yog precipitated, thiab lub zog tensile ntawm fiber yog txo los ntawm li 20 feem pua; Tshaj 500 degree, Dej ntawm crystallization pib cais tawm, thiab lub zog qis dua.

Qhov nruab nrab kuj muaj kev cuam tshuam zoo rau lub zog ntawm cov ntaub ntawv roj hmab asbestos. Piv txwv li, nyob rau hauv aviation lubricating roj thiab aviation roj, lub transverse tensile lub zog ntawm No. 400 roj-resistant asbestos roj hmab ntawv txawv los ntawm 80 feem pua, uas yog vim lub fact tias aviation roj swells cov roj hmab nyob rau hauv daim ntawv ntau hnyav tshaj aviation lubricating. roj. Noj rau hauv cov ntsiab lus saum toj no, kev pom zoo siv ntau yam ntawm asbestos roj hmab ntawv XB450: kub 250 degree ~ 300 degree, siab 3 ~ 3.5MPa; 400 roj-resistant asbestos roj hmab ntawv siv kub yuav tsum tsis txhob ntau tshaj 350 degree.

Cov ntaub ntawv roj hmab asbestos muaj cov tshuaj chloride ions thiab sulfides, uas yog ib qho yooj yim los tsim cov kab mob corrosion nrog hlau flanges tom qab nqus dej. Tshwj xeeb tshaj yog, cov ntsiab lus sulfur ntawm roj-resistant asbestos roj hmab nplooj ntawv yog ob peb zaug siab dua li cov ntaub ntawv asbestos zoo tib yam, yog li nws tsis haum rau siv hauv cov xov xwm tsis muaj roj. Roj hmab gaskets yuav o nyob rau hauv cov roj thiab hnyav xov xwm, tab sis nyob rau hauv ib tug tej yam ntau yam, lawv muaj me ntsis cuam tshuam rau sealing kev ua tau zoo. Piv txwv li, No. 400 roj-resistant asbestos roj hmab daim ntawv yog raug rau ib tug 24- teev immersion xeem nyob rau hauv ib txwm kub aviation roj, thiab nws yuav tsum tau kom qhov hnyav nce vim roj nqus yuav tsum tsis txhob ntau tshaj 15 feem pua.