TS EN 10217-5 P235GH yog tus qauv thiab dav muaj cov khoom siv tshwj xeeb rau kev tsim Kauv Submerged Arc Welded (SSAW) steel kav[siv: 1, citation: 2, citation: 4, citation: 5]. Qhov kev sib xyaw ua ke no yog cov khoom lag luam uas muaj ntau lub tuam txhab thoob ntiaj teb rau kev siv siab - kub siab xws li boilers, heat exchangers, superheaters, thiab cov txheej txheem kev lag luam uas yuav tsum tau ua kom sov siab thiab ua raws PED [citation: 1, citation: 3, citation: 6, citation: 7].
TS EN 10217-5 P235GH Kauv Submerged Arc Pipe" muab cov nruab nrab -lub zog siab- kub siab qib (P235GH) los ntawm Ntu 5 ntawm European siab yeeb nkab qauv-uasQhia meej meej npog submerged arc welded (SAW) raj-nrog rau cov txheej txheem kauv welding rau loj - txoj kab uas hla, siab- ntsuas piping daws yuav tsum tau guaranteed siab kub ua tau zoo [citation:2, citation:6, citation:8].
📋 Cov ntsiab lus tseem ceeb rau EN 10217-5 P235GH SSAW Yeeb Nkab
Cov lus hauv qab no qhia txog cov ntsiab lus tseem ceeb rau cov khoom no, raws li cov ntaub ntawv kev lag luam dav dav [citation: 1, citation: 2, citation: 4, citation: 5, citation: 6, citation: 7, citation: 8, citation: 9].
| Yam ntxwv | Kev piav qhia |
|---|---|
| Txuj | TS EN 10217-5: "Welded steel raj rau lub hom phiaj siab - Kev xa khoom xa tuaj - Ntu 5: Submerged arc welded non-alloy thiab alloy steel tubes nrog qhov ntsuas kub siab" [citation: 2, citation: 6, citation: 7, citation: 8]. |
| Qib Steel | P235GH: Ib qho nruab nrab -lub zog siab- kub siab qib. "P" qhia txog lub hom phiaj siab, "235" qhia qhov tsawg kawg nkaus lub zog hauv MPa, thiab "GH" sawv rau "Gases" thiab "High" kub, qhia qhov tsim nyog rau kev pabcuam kub siab [citation: 2, citation: 6, citation: 7]. |
| Khoom Naj Npawb | 1.0345[siv: 2, citation: 6, citation: 7]. |
| Kev tsim khoom | Spiral Submerged Arc Vuam (SSAW/HSAW/SAWH): Ua los ntawm kub- dov steel coil, nrog cov vuam seam khiav tsis tu ncua nyob rau hauv ib tug kauv raws cov yeeb nkab ntev.TS EN 10217-5 Qhia meej meej npog SAW raj nrog helical seams (SAWH)[siv: 1, citation: 2, citation: 4, citation: 5]. |
| Tshuaj muaj pes tsawg leeg (max %) [citation: 2, citation: 5, citation: 6, citation: 8, citation: 9] | Cov pa roj carbon (C):0.16% max Silicon (Si):0.35-0.50% max Manganese (Mn):0.60-1.20% max Phosphorus (P):0.025% max Sulfur (S):0.015-0.020% max Aluminium (hli): Ntau dua lossis sib npaug rau 0.020% min(yuav tsum tau ua rau qib GH) Chromium (Cr):0.30% max Copper (Cu):0.30% max Molybdenum (Molybdenum):0.08% max Nickel (Ni):0.30% max Cr + Cu + Mo + Ni:0.70% max tag nrho cov seem seem |
| Mechanical Properties ntawm Chav Kub [citation: 5, citation: 6, citation: 9] | Yield Strength (t Tsawg dua los yog sib npaug rau 16mm): 235 MPa rauyam tsawg kawg nkaus Yield Strength (16 < t Tsawg dua los yog sib npaug rau 40mm): 225 MPayam tsawg kawg nkaus Tensile zog: 360-480 MPa(txog 100mm) los yog360-500 MPa(General ntau yam) [citation: 6, citation: 9] Elongation (longitudinal):Ntau dua lossis sib npaug25%[siv: 6, citation: 9] Elongation (transverse):Ntau dua lossis sib npaug23%[siv: 6, citation: 9] |
| Kev kub siab ua kom muaj zog (Rp0.2 min, MPa) [citation: 7, citation: 9] | 100 degree:198-212 MPa 150 degree:187-198 MPa 200 degree:170-185 MPa 250 degree:150-165 MPa 300 degree:132-140 MPa 350 degree:120 MPa 400 degree:112-125 MPa |
| Impact Properties [citation: 6, citation: 9] | Charpy V-ntsis cuam tshuam: 40 J yam tsawg kawg nkaus ntawm 0℃(longitudinal) 28 J yam tsawg kawg nkaus ntawm -10℃(longitudinal) 27 J yam tsawg kawg nkaus ntawm 0℃(transverse) |
| Hom Loj Ntau Yam [citation: 1, citation: 4, citation: 5] | Sab nraud txoj kab uas hla:219 mm txog 4064 mm (kwv yees . 8" rau 160") rau SSAW [citation:4, citation:5] Phab ntsa Thickness:5 hli mus rau 40 hli (ntau ntau 6-32 hli) [citation: 4, citation: 5] Ntev:3 m rau 18 m txheem; mus txog 25 m muaj |
| Cov Kev Ntsuas Tseem Ceeb [citation: 2, citation: 5, citation: 8] | Tshuaj ntsuam xyuas:Rau cast Tensile Test:Nyob rau hauv chav tsev kub (ib batch) Kev kub siab Tensile:Thaum tau teev tseg Impact Test: Yuav tsum Charpy V-notch ntawm 0 degree(40J longitudinal) Khoov Test:Rau weld kev ncaj ncees Flattening Test:Rau ductility Hydrostatic Test:100% ntawm cov kav dej; Ntau dua lossis sib npaug rau 1.5 × tsim siab rau Ntau dua lossis sib npaug rau 10 vib nas this [citation: 2, citation: 8] NDT ntawm Weld: 100% ultrasonic lossis radiographic tshuaj xyuasntawm tag nrho cov weld seam [citation: 2, citation: 5, citation: 8] Kev tshuaj xyuas qhov muag:100% ntawm cov kav dej |
| Qeb xeem | TC1:Standard xeem qeb rau cov uas tsis yog -alloy steel hlab, nrog rau yuav tsum tau kuaj tej yam thiab NDT ntawm weld seam TC 2:Txhim kho qeb xeem nrog NDT ntxiv ntawm cov yeeb nkab lub cev |
| Qhov kub thiab txias | Tsim los rauKev pabcuam kub siabmus txog400 degreenrog guaranteed yield zog zog [citation: 6, citation: 7, citation: 9]. |
| PED Kev Ua Raws Cai | EN 10217-5 yog sib haum xeeb nrog EU Cov Khoom Siv Hluav Taws Xob Cov Lus Qhia 2014/68 / EU. Cov kav dej uas tsim los rau tus qauv no nrog EN 10204 Hom 3.1 ntawv pov thawj yog tsim rau CE - cov cuab yeej siv siab [citation: 1, citation: 2, citation: 6, citation: 8]. |
| Cov ntawv thov dav [citation: 3, citation: 6, citation: 7] | Boiler raj; kub exchangers; superheaters; feedwater kab hauv fais fab nroj tsuag; chav kav dej; kev lag luam txheej txheem kav dej ntawm qhov kub siab (txog 400 degree); chemical cog piping; cov hlab ntsha siab; cheeb tsam cua sov tshuab. |
| Daim ntawv pov thawj | Mill Test Certificate rauEN 10204 Hom 3.1(lossis Hom 3.2 rau kev txheeb xyuas tus kheej) nrog rau tag nrho cov txiaj ntsig, cov ntaub ntawv taug qab, thiab cov ntaub ntawv PED [citation: 2, citation: 8]. |
TS EN 10217-5 - Ntu 5: Ntu 5: Kev ntsuas qhov siab ntawm cov yeeb nkab
EN 10217-5 yog tshwj xeeb rauSubmerged arc welded (SAW) raj, ua nws tus qauv raug rau SSAW kav. Cov lus hauv qab no qhia meej cov qauv ntawm EN 10217 [citation: 2, citation: 8]:
| Ib feem | Title | Cov txheej txheem siv tau |
|---|---|---|
| Ntu 1 | Tsis yog - alloy steel tubes nrog cov khoom tshwj xeeb hauv chav sov | Electric welded (EW) thiab SAW |
| Ntu 2 | Hluav taws xob welded raj nrog elevated kub zog | Hluav taws xob welded (EW) nkaus xwb |
| Ntu 5 | Submerged arc welded raj nrog elevated kub zog | Submerged arc welded (SAW) nkaus xwb |
Key Takeaway:Rau kauv submerged arc welded kav yuav tsum tau elevated kub zog,EN 10217-5 yog qhov tseeb tshwj xeebTS EN 10217-2 (uas yog rau cov hlua hluav taws xob welded)
📏 Dimensional Tolerances
TS EN 10217-5 Kev ntsuas qhov ntsuas hauv qab no rau cov kav dej SAW [citation: 2, citation: 5]:
| Parameter | Ua siab ntev |
|---|---|
| Sab nraud txoj kab uas hla (D Tsawg dua los yog sib npaug rau 219.1mm) | ± 1% lossis ± 0.5mm (qhov twg ntau dua) |
| Sab nraud txoj kab uas hla (D> 219.1mm) | ±0.75%ntawm txoj kab uas hla |
| Phab ntsa Thickness (T Tsawg dua lossis sib npaug li 5 hli) | ± 10% lossis ± 0.3mm (qhov twg ntau dua) |
| Phab ntsa Thickness (T> 5mm) | ±8% |
| Kev ncaj | Tsawg dua los yog sib npaug0.0015 × L(max 3mm ib meter) [citation: 2, citation: 8] |
| Ntev (L Tsawg dua lossis sib npaug li 6000mm) | 0 - +10 hli (D < 406.4mm); 0 - +25 hli (D Ntau dua lossis sib npaug rau 406.4mm) |
| Ntev (6000 |
0 - +15 hli (D < 406.4mm); 0 - +50 hli (D Ntau dua lossis sib npaug rau 406.4mm) |
| Tawm - ntawm -Roundness (D> 406.4mm, D / T Tsawg dua lossis sib npaug li 100) | Tsawg dua los yog sib npaug2% |
🔍 Cov ntsiab lus tseem ceeb kom nkag siab
Dab tsi "EN 10217-5 P235GH" txhais tau tias: Qhov no yog European tus qauv rausubmerged arc welded siab kav kav nrog siab kub zog. P235GH yog qhov nruab nrab - qib zog, nrog qhov tsawg kawg nkaus tawm lub zog ntawm235 MPa rauntawm chav tsev kub. Cov lus "GH" qhia txog qhov tsim nyog rau kev pabcuam kub siab, nrog cov khoom pov thawj txog li 400℃[citation: 6, citation: 7, citation: 9]. Cov kav dej rau tus qauv no yog tsim los ua kom tau raws li qhov yuav tsum tau muaj kev nyab xeeb ntawm EU Cov Khoom Siv Hluav Taws Xob (PED) 2014/68/EU [citation: 1, citation: 2, citation: 6].
Part 5 vs. Part 2 DistinctionKev sib txawv tseem ceeb ntawm EN 10217-2 thiab EN 10217-5:
TS EN 10217-2: Covhluav taws xob welded(EW / ERW) cov raj nrog cov khoom kub siab
TS EN 10217-5: Covsubmerged arc welded(SAW) cov raj uas muaj qhov kub thiab txias
Rau SSAW kav,Ntu 5 yog tus qauv raug, raws li nws qhia meej txog helical seam vuam [citation: 2, citation: 8].
Kev kub siab muaj peev xwm: Qhov tseem ceeb ntawm P235GH yog nwslav lub zog ntawm qhov kub thiab txiasmus txog 400 degree. Lub zog tawm los txo qis nrog qhov kub thiab txias, raws li qhia hauv cov lus saum toj no [citation: 7, citation: 9]. Qhov no tso cai rau cov neeg tsim qauv suav cov kev ntxhov siab uas tso cai rau siab - cov ntawv thov kub siv qhov muab Rp0.2 tus nqi.
Yam yuav tsum tau muaj kev cuam tshuam: GH qib yuav tsum tauYuav tsum tau kuaj Charpy cuam tshuam ntawm 0 degree(40J longitudinal yam tsawg kawg nkaus), ua kom muaj kev nyab xeeb rau kev nyab xeeb - cov ntawv thov kev nyuaj siab [citation:6, citation:9].
Aluminium Requirement: P235GH xav tauQhov tsawg kawg nkaus aluminium ntsiab lus ntawm 0.020%rau cov nplej ua kom zoo, ua kom zoo- cov qauv nplej thiab cov khoom siv kho kom zoo dua qub, uas yog qhov tseem ceeb rau kev ua raws li PED [citation:2, citation:8].
PED Kev Ua Raws CaiTS EN 10217-5 yog sib haum xeeb nrog covEU Cov Khoom Siv Hluav Taws Xob Cov Lus Qhia 2014/68/EU. Cov kav dej uas tsim los rau tus qauv no nrog EN 10204 Hom 3.1 daim ntawv pov thawj raug suav tias ua raws li qhov tseem ceeb ntawm kev nyab xeeb ntawm PED thiab tuaj yeem ua CE cim [citation: 1, citation: 2, citation: 6].
Ntau-Certification: Ntau lub tuam txhab muab cov kav dej P235GH uas muaj ntau- ntawv pov thawj los npog lwm cov qauv. Piv txwv li, cov kav dej tuaj yeem raug lees paub rau EN 10217-5 P235GH nrog rau EN 10217-2 P235GH, API 5L Qib B, thiab lwm yam kev qhia tshwj xeeb, muab kev yooj yim rau cov haujlwm uas muaj ntau yam yuav tsum tau [citation: 1, citation: 5].
SSAW Qhov Zoo rau P235GH: Cov txheej txheem welding muab cov txiaj ntsig tshwj xeeb rau qhov loj - txoj kab uas hla, PED- cov kav dej ua raws [citation: 4, citation: 5]:
Loj Loj Muaj peev xwm: Muaj peev xwm tsim cov kav dej mus txog 160 "inch
Nthuav qhia meejTS EN 10217-5 Qhia meej meej npog SAW raj nrog helical seams (SAWH)
Ntev ntev: Txog li 25m ntev txo cov pob qij txha
100% NDT: Yuav tsum tau kuaj xyuas ultrasonic lossis radiographic xyuas kom zoo weld [citation: 2, citation: 5, citation: 8]
Cov txheej txheem tsim khoom rau EN 10217-5 P235GH SSAW Yeeb Nkab
Cov txheej txheem tsim khoom ua raws li kev tswj hwm zoo tsim nyog rau GH ntawv pov thawj thiab PED ua raws [citation: 2, citation: 4, citation: 5]:
| Kauj ruam | Kev piav qhia |
|---|---|
| 1. Kev npaj cov khoom nyoos | Kub-rolled steel coils raws li P235GH chemistry yuav tsum tau (tag nrho tua, nplua nplej hlau nrog Al Ntau dua lossis sib npaug li 0.020%) yog qib, tshuaj xyuas, thiab ntug-milled [citation:2, citation:8]. |
| 2. Kauv sib sau | Cov hlau sawb txuas ntxiv tsim rau hauv cov duab cylindrical ntawm lub kaum sab xis ntawm lub kaum sab xis ntawm chav tsev kub siv JCOE lossis cov cuab yeej zoo sib xws [citation: 4, citation: 5]. |
| 3. Submerged Arc Vuam | Muab ob npaug rau-sided tsis siv neeg submerged arc vuam (sab hauv thiab sab nraud) tsim cov kauv seam nrog kev nkag mus rau tag nrho. EN 10217-5 tso cai meej meejhelical seam (SAWH) vuam[siv: 2, citation: 4, citation: 5]. |
| 4. Tsis yog-Kev kuaj kev puas tsuaj | 100% ultrasonic (UT) lossis radiographic (RT) tshuaj xyuasNtawm tag nrho cov weld seam yuav tsum tau ua raws li EN 10217-5 cov cai [citation: 2, citation: 5, citation: 8]. |
| 5. Kev Ntsuas Hydrostatic | Txhua cov yeeb nkab ib leeg raug kuaj xyuas kom paub tseeb qhov siab ncaj ncees (Ntau dua lossis sib npaug ntawm 1.5 × tsim siab, Ntau dua lossis sib npaug li 10 vib nas this) [citation: 2, citation: 8]. |
| 6. Kev kuaj xyuas tshuab | Kev ntsuas tensile (chav kub thiab xaiv qhov kub siab), ntsuas kev sib tw, khoov kuaj, thiabYuav tsum tau kuaj Charpy cuam tshuam ntawm 0 degreelos txheeb xyuas cov khoom [citation:2, citation:5, citation:8]. |
| 7. Dimensional soj ntsuam | 100% pov thawj ntawm qhov ntev, ncaj, thiab xaus squareness ib EN 10217-5 tolerances. |
| 8. Kev ua tiav tiav | Xaus npaj (dawb los yog beveled) rau welding teb; beveled xaus rau phab ntsa thickness> 4mm feem ntau. |
| 9. Daim ntawv pov thawj | TS EN 10204 Hom 3.1 lossis 3.2 kev tshuaj xyuas daim ntawv pov thawj nrog tag nrho traceability, tshuaj tshuaj xyuas, khoom siv kho tshuab, NDT cov txiaj ntsig, thiab cov ntaub ntawv PED [citation: 2, citation: 5, citation: 8]. |
🏭 Daim ntawv thov
TS EN 10217-5 P235GH SSAW kav yog dav siv nyob rau hauv siab kub siab daim ntawv thov [citation: 3, citation: 6, citation: 7]:
| Daim ntawv thov | Qhov kub thiab txias | Vim li cas P235GH thiaj xaiv |
|---|---|---|
| Boiler Tubes | Txog li 400 degree | Guaranteed kub lub zog; Kev ua raws li PED |
| Thaum tshav kub kub Exchangers | Txog li 400 degree | Zoo weldability; ntawv pov thawj siab ntsuas; yuav tsum muaj tej yam khoom |
| Superheater Tubes | Txog li 400 degree | Zoo heev -kub creep kuj; SAW weld zoo |
| Chav Piping | Txog li 400 degree | Txhim khu kev ua tau zoo; tag nrho traceability; CE cim |
| Fais fab Cog Piping | Txog li 400 degree | Lub zog nruab nrab tso cai rau txo phab ntsa thickness vs. P195GH |
| Muaj Txheej Txheem Piping | Txog li 400 degree | Kev ua raws li European qauv; haum rau siab -kub kua |
| Cov nkoj siab | Txog li 400 degree | PED Qeb II, III, IV daim ntawv thov nrog kev tshuaj xyuas tshwj xeeb |
| Cheeb tsam cua sov | Txog li 150 degree | Tus nqi -zoo rau cov kab loj loj; ntawv pov thawj zoo |
📝 Cov ntsiab lus tseem ceeb
Ntu 5 Xaiv: Rau SSAW kav,Xyuas kom koj qhia EN 10217-5, tsis yog EN 10217-2. Ntu 2 yog rau cov hlua hluav taws xob welded, thaum Ntu 5 yog tshwj xeeb rau cov raj xa dej arc welded [citation: 2, citation: 8].
PED Kev Ua Raws CaiTS EN 10217-5 yog sib haum xeeb nrog covEU Cov Khoom Siv Hluav Taws Xob Cov Lus Qhia 2014/68/EU. Cov kav dej rau tus qauv no nrog EN 10204 Hom 3.1 ntawv pov thawj yog tsim rau CE - cov cuab yeej ntsuas siab [citation: 1, citation: 2, citation: 6].
Kev xeem qeb xaiv: Rau cov ntawv thov tseem ceeb, qhia meejTC 2qeb xeem uas suav nrog NDT ntxiv ntawm cov yeeb nkab lub cev [citation:2, citation:5].
Cov kev xaiv ntxiv[siv: 2, citation: 8]:
Kev xaiv 4: Kev ntsuas cuam tshuam ntawm qhov ntsuas kub (xws li -20 degree)
Kev xaiv 5: Ntxiv longitudinal impact test ntawm -10℃(28J yam tsawg kawg nkaus)
Kev xaiv 2: Tighter txwv ntawm cov ntsiab lus tooj liab kom txhim kho formability
Kub Derating: Kev tsim qauv yuav tsum suav nrog qhov txo qis ntawm qhov tawm los ntawm lub zog siab ntawm qhov kub siab. Siv qhov muab Rp0.2 qhov tseem ceeb rau kev suav cov kev ntxhov siab raug tso cai ntawm qhov ntsuas kub tsim [citation: 7, citation: 9].
International sib npaug :
ASTM A106 Qib B(seamless, zoo sib xws lub zog)
ASTM A285 Qib C(phaj)
GB/T 5310 20G(Suav txheem rau boiler raj)
DIN 17175 St35.8(German sib npaug)
TS EN ISO 9329-1 P235GH
Weldability: P235GH muaj qhov zoo tshaj plaws weldability nrog qis carbon sib npaug (CEV Tsawg dua lossis sib npaug rau 0.41). Rau kev siv lub nkoj siab, cov txheej txheem vuam yuav tsum tsim nyog raws li cov cai muaj feem xyuam.
Ua kom tiav Specification: Thaum xaj, qhia [citation:2, citation:5, citation:8]:
TS EN 10217-5, Qib P235GH, SAWH (kauv welded), Loj (OD x WT), Ntev, Xaus Xaus
Txheem version: [e.g., EN 10217-5: 2019]
Qeb xeem: [TC1 lossis TC2]
Cov txheej txheem txheej: [piv txwv li, liab qab, kua roj vanish, FBE, 3LPE]
Ib qho kev xaiv ntxiv (Kev Xaiv 4, Kev Xaiv 5) yog tias xav tau
Daim ntawv pov thawj: EN 10204 Hom 3.1 (los yog Hom 3.2)
📝 Cov ntsiab lus
TS EN 10217-5 P235GH Kauv Submerged Arc Welded kavyog atus qauv, PED-raws li, thiab siv dav xaivrau siab kub siab daim ntawv thov raws li European siab yeeb nkab txheem [citation: 1, citation: 2, citation: 5, citation: 6, citation: 7]. Nrog yam tsawg kawg nkaus chav tsev kub tawm los lub zog ntawm235 MPa rauthiab guaranteed siab kub zog mus txog400 degree, cov kav dej no muaj kev txhim khu kev qha, tus nqi- siv tau zoo rau cov raj boiler, cov khoom siv hluav taws xob sib hloov, cov kav dej, thiab lwm yam siab - cov ntawv thov kub uas xav tau SAW weld zoo [citation: 3, citation: 6, citation: 7].
CovEN 10217-5 tus qauvyog tshwj xeeb rausubmerged arc welded raj, ua qhov tseeb specification rau SSAW kav. Cov yam ntxwv tseem ceeb muaj xws li:
Kev qhia meej ntawm SAW rajnrog helical seams (SAWH) [citation: 2, citation: 4, citation: 5]
Guaranteed kub lub zognrog cov ntaub ntawv Rp0.2 qhov tseem ceeb txog 400℃[citation: 7, citation: 9]
Yuav tsum tau Charpy impact testntawm 0℃(40J yam tsawg kawg nkaus) kom ntseeg tau tias muaj kev nyab xeeb rau kev nyab xeeb - cov ntawv thov kev nyuaj siab [citation:6, citation:9]
Yam tsawg kawg nkaus txhuas cov ntsiab lus (Ntau dua lossis sib npaug rau 0.020%)rau grain refinement thiab enhanced zog [citation:2, citation:8]
PED 2014/68/EU ua rawsrau CE - cov cuab yeej ntsuas siab [citation:1, citation:2, citation:6]
Ob pawg xeem (TC1 thiab TC2)tso cai rau kev xaiv cov qib tsim nyog raws li daim ntawv thov tseem ceeb [citation: 2, citation: 5]
Muaj nyob rau hauv diameters los ntawm219mm txog 4000mmnrog phab ntsa thicknesses rau40 mmthiab ntev mus txog25m, cov kav dej no yog tsim los siv tus nqi- cov txheej txheem tsim khoom SSAW tau zoo thaum ua tau raws li cov kev cai nruj ntawm EN 10217-5 specification [citation:4, citation:5].
P235GH yogfeem ntau nruab nrab -lub zog siab- qib kubNyob rau hauv EN 10217-5 tsev neeg, haum rau feem ntau ntawm boiler thiab siab piping daim ntaub ntawv. Rau kev xav tau siab dua, xav txog kev kho dua tshiab rauP265GH[siv: 1, citation: 2, citation: 3]. Rau kev pabcuam siab tshaj 400℃txog 500 degree, qhia cov qib alloy steel16 hmo 3[siv: 1, citation: 2, citation: 8].
Thaum txiav txim, xyuas kom meej tias koj qhia meej cov qauv ua tiav nrog qib, kev tsim khoom (SAWH), qeb xeem (TC1 lossis TC2), qhov ntev yuav tsum tau ua, thiab cov txheej txheem los yog ntxiv raws li koj daim ntawv thov tshwj xeeb thiab PED cov cai [citation: 2, citation: 5, citation: 8].
