Txais tos rau CHUANGRONG

Dub PE100-RC Resistant Crack Corrosion Resistance HDPE Yeeb Nkab Rau Dej thiab Roj

Lus piav qhia luv luv:

1. Loj:DN20-1600mm rau Kev Siv Dej.

2. Siab:SDR33- SDR7.4, PN4-PN25.

3. Khoom siv:100% nkauj xwb PE 80, PE 100, PE 100-RC.

4. Txuj:ISO 4427, EN 12201, ASTM F714, AS / NZS 4130, DIN 8074, GOST 18599, IPS.

5. Ntim:11.8m, los yog 5.8m / pcs rau ncaj, 50-200m los ntawm coils rau DN20-110mm.

6. Kev xa khoom:3-15 hnub nyob ntawm tag nrho cov khoom.

7. Kev tshuaj xyuas:Raw khoom inspection.Finished khoom inspection.Third tog soj ntsuam ntawm kev thov.

8. Fittings:OD20-1600mm, SDR26-SDR7.4, Socket fusion, Butt fusion, Electrofusion, Fabricated, Machined, Compression fittings.

 

 


Product Detail

Specification & Txheej txheem

Daim ntawv thov & ntawv pov thawj

Khoom cim npe

Cov ntaub ntawv yooj yim

CHUANGRONG lub hom phiaj yog muab cov neeg siv khoom sib txawv nrog kev daws teeb meem zoo tshaj plaws rau cov yeeb nkab yas.Nws tuaj yeem muab kev tsim qauv tsim, kev pabcuam customized rau koj qhov project.

Dub PE100-RC Resistant Crack Corrosion Resistance HDPE Yeeb Nkab Rau Dej thiab Roj

Cov Khoom Paub meej

Lub tuam txhab / Lub Hoobkas muaj zog

Lub npe High Density Polyethylene (HDPE) Cov kav dej haus Muaj Peev Xwm Ntau Lawm 100,000 Tons / Xyoo
qhov loj DN20-1600 hli Qauv Dawb qauv muaj
Siab PN4- PN25, SDR33-SDR7.4 Lub sij hawm xa tuaj 3-15 hnub, nyob ntawm seb muaj pes tsawg
Cov qauv ISO 4427, ASTM F714, EN 12201, AS / NZS 4130, DIN 8074, IPS Kev kuaj / tshuaj xyuas National standard Laboratory, kuaj ua ntej xa khoom
Raw Khoom 100% Virgin l PE80, PE100, PE100-RC Daim ntawv pov thawj ISO9001, CE, WRAS, BV, SGS
Xim Dub nrog xiav kab txaij, Xiav lossis lwm yam xim Warranty 50 xyoo nrog ib txwm siv
Ntim 5.8m lossis 11.8m / ntev, 50-200m / yob, rau DN20-110mm.  Zoo QA & QC system, Xyuas kom muaj kev taug qab ntawm txhua tus txheej txheem
Daim ntawv thov

Cov dej haus, dej tshiab, dej ntws, roj thiab roj, Mining, Dredging, Marine, Irrigation, Kev Lag Luam, Tshuaj, Hluav Taws Xob ...

Kev pabcuam R & D, ntau lawm, muag thiab installation, kev pab cuam tom qab muag

Cov khoom sib txuam: Butt fusion, Socket fusion, Electrofusion, Drainage, Fabricated, Machined haum, Compression fittings, Yas Vuam tshuab thiab cov cuab yeej, thiab lwm yam.

Txais tos tuaj xyuas peb lub Hoobkas lossis ua tus neeg thib peb kuaj.

Txais tos tiv tauj peb kom paub meej cov khoom thiab kev pabcuam tshaj lij.

Thov xa email rau:chuangrong@cdchuangrong.com 

 

Product Description

CHUANGRONG PE100-RC DN20-DN1600 HDPE yeeb nkab

Polyethylene yeeb nkab cov ntaub ntawv tau dhau los ntawm 4 theem.

Thawj theem pib thaum xyoo 1950, thiab feem ntau muaj cov polyethylene macromolecules tsis muaj ceg;qhov thib ob yog PE80 khoom;qhov thib peb yog PE100 khoom;qhov thib plaub dhau ntawm Molecular qauv tsim.

High toughness polyethylene PE100-RC yeeb nkab tsis tsuas yog tuav lub zoo toughness, zoo hnav tsis kam thiab corrosion kuj ntawm PE100 yeeb nkab, tab sis kuj muaj cov yam ntxwv hauv qab no:

1, Nrog siab toughness:siab toughness polyethylene PE100-RC yeeb nkab elongation ntawm kev tawg ntawm ntau tshaj 500%, muaj kev cuam tshuam lub zog, ua rau muaj zog poob siab thiab distortion.Raws li qhov sib txawv ntawm cov crustal hloov xws li av qeeg thiab av qeeg, cov kav dej yuav tsis tawg thiab muaj kev nyab xeeb siab.

2,High resistance to stress cracking:siab toughness polyethylene PE100-RC yeeb nkab muaj super toughness, ib txwm ua hauj lwm lub neej ntawm ntau tshaj 100 xyoo.Yog tias cov phab ntsa sab nrauv ntawm lub raj xa dej raug khawb thaum lub sijhawm thauj mus los lossis kev tsim kho, qhov khawb qhov tob yog tsawg dua 20% ntawm phab ntsa tuab, vim tias nws qhov tawg tiv thaiv kev loj hlob tsuas yog ib feem kaum ntawm cov khoom siv qib high-density PE100, nws tuaj yeem ua tau zoo. kev ua haujlwm ib txwm ua ntawm cov yeeb nkab thiab txuas ntxiv lub neej kev pabcuam.Raws li txoj cai, thaum khawb qhov tob ntawm high-density PE100 yeeb nkab yog ntau dua 10% phab ntsa thickness, nws tsis tuaj yeem ua tau raws li tus qauv yuav tsum tau ua.

3,Scratch kuj:Vim tias qhov tawv tawv ntawm PE100 -RChigh toughness polyethylene s yeeb nkab yog siab dua li ntawm high-density PE100, nyob rau hauv tib qho kev khawb, qhov tob ntawm khawb yog txo los ntawm 1/3 ~ 1/2 dua li ntawm high-density PE100 yeeb nkab. .

4, High resistance to point load:Thaum lub sijhawm ua haujlwm ntawm cov raj xa dej, cov phab ntsa sab nrauv yog nyem los ntawm cov khoom tawv xws li pob zeb hauv av rau lub sijhawm ntev, ua rau kev nyuaj siab sab hauv, uas yog hu ua point load.PE100-RC high-toughness polyethylene yeeb nkab tuaj yeem tiv thaiv kev puas tsuaj ntawm cov ntsiab lus thauj khoom, ua kom cov kav dej muaj kev nyab xeeb thiab txhim khu kev qha, thiab ua tau raws li kev siv cov kav dej rau 50 xyoo.Thaum lub sij hawm ua hauj lwm ntawm high-density PE100 yeeb nkab, sab nrauv phab ntsa yog nyem los ntawm cov ntaub ntawv nyuaj xws li pob zeb rau lub sij hawm ntev, uas yuav ua rau lub puab phab ntsa ntawm cov yeeb nkab bulge thiab lub zos nkig tawg.

 

CHUANGRONG muaj pab pawg neeg ua haujlwm zoo nrog kev paub nplua nuj.Nws lub hauv paus tseem ceeb yog Kev Ncaj Ncees, Kev Ua Haujlwm thiab Ua Tau Zoo.Nws tau tsim kev lag luam kev sib raug zoo nrog ntau dua 80 lub teb chaws thiab thaj chaw hauv kev lag luam txheeb ze.Xws li Tebchaws Meskas, Chile, Guyana, United Arab Emirates, Saudi Arabia, Indonesia, Malaysia, Bangladesh, Mongolia, Russia, Africa thiab lwm yam.

Txais tos tiv tauj peb kom paub meej cov khoom thiab kev pabcuam tshaj lij.

Thov xa email rau: chuangrong@cdchuangrong.com  los yog Tel:+86-28-84319855


  • Yav dhau los:
  • Tom ntej:

  • PE100-RC Resist Crack Corrosion Resistance HDPE Yeeb Nkab Rau Dej thiab Roj

     

    PEB 100

    0.4MPa siab

    0.5MPa

    0.6MPa siab

    0.8MPa ua

    1.0MPa

    1.25MPa

    1.6MPa

    2.0MPa

    2.5MPa

    Sab nraud txoj kab uas hla

    (mm)

    PN4

    PN 5

    PN 6

    PN8

    PIB 10

    PIB 12.5

    NP16

    PIB 20

    PIB 25

    SDR 41

    SDR 33

    SDR 26

    SDR 21

    SDR 17

    SDR 13.6

    SDR 11

    SDR 9

    SDR 7.4

    Phab ntsa Thickness (en)

    20

    -

    -

    -

    -

    -

    -

    2.0

    2.3

    3.0

    25

    -

    -

    -

    -

    -

    2.0

    2.3

    3

    3.5

    32

    -

    -

    -

    -

    2.0

    2.4

    3.0

    3.6

    4.4

    40

    -

    -

    -

    2.0

    2.4

    3.0

    3.7

    4.5

    5.5

    50

    -

    -

    2.0

    2.4

    3.0

    3.7

    4.6

    5.6

    6.9

    63

    -

    -

    2.5

    3.0

    3.8

    4.7

    5.8

    7.1

    8.6

    75

    -

    -

    2.9

    3.6

    4.5

    5.6

    6.8

    8.4

    10.3

    90

    -

    -

    3.5

    4.3

    5.4

    6.7

    8.2

    10.1

    12.3

    110

    -

    -

    4.2

    5.3

    6.6

    8.1

    10.0

    12.3

    15.1

    125

    -

    -

    4.8

    6.0

    7.4 ib

    9.2 ib

    11.4

    14

    17.1

    140

    -

    -

    5.4

    6.7

    8.3

    10.3

    12.7 ib

    15.7 ib

    19.2 ib

    160

    -

    -

    6.2

    7.7

    9.5 ib

    11.8 ib

    14.6 ib

    17.9 ib

    21.9 ib

    180

    -

    -

    6.9

    8.6

    10.7 ib

    13.3

    16.4 ib

    20.1

    24.6 ib

    200

    -

    -

    7.7

    9.6 ib

    11.9 ib

    14.7 ib

    18.2

    22.4 ib

    27.4 ib

    225

    -

    -

    8.6

    10.8 ib

    13.4

    16.6

    20.5 ib

    25.2 ib

    30.8 ib

    250

    -

    -

    9.6 ib

    11.9 ib

    14.8 ib

    18.4 ib

    22.7 ib

    27.9 ib

    34.2 ib

    280

    -

    -

    10.7 ib

    13.4

    16.6

    20.6

    25.4 ib

    31.3

    38.3 ib

    315

    7.7

    9.7 ib

    12.1

    15

    18.7 ib

    23.2

    28.6 ib

    35.2 ib

    43.1 ib

    355

    8.7 ib

    10.9

    13.6

    16.9 ib

    21.1

    26.1 ib

    32.2 ib

    39.7 ib

    48.5 ib

    400

    9.8 ib

    12.3

    15.3

    19.1 ib

    23.7 ib

    29.4 ib

    36.3 ib

    44.7 ib

    54.7 ib

    450

    11

    13.8 ib

    17.2 ib

    21.5 ib

    26.7 ib

    33.1

    40.9 ua

    50.3

    61.5 ib

    500

    12.3

    15.3

    19.1 ib

    23.9 Nws

    29.7 ib

    36.8 ib

    45.4 ib

    55.8 ua

    -

    560

    13.7 ib

    17.2 ib

    21.4 ib

    26.7 ib

    33.2 ib

    41.2 ib

    50.8 ib

    62.5 ib

    -

    630

    15.4 ib

    19.3 ib

    24.1

    30

    37.4 ib

    46.3 ib

    57.2 ib

    70.3 ib

    -

    7 10

    17.4 ib

    21.8 ib

    27.2 ib

    33.9 ib

    42.1 ib

    52.2 ib

    64.5 ib

    79.3 ib

    -

    800

    19.6 ib

    24.5 ib

    30.6 ib

    38.1 ib

    47.4 ib

    58.8 ua

    72.6 ib

    89.3 ib

    -

    900

    22

    27.6 ib

    34.4 ib

    42.9 ib

    5 3.3

    66.2 ib

    81.7 ib

    -

    -

    1000

    24.5 ib

    30.6 ib

    38.2 ib

    47.7 ib

    59.3 ib

    72.5 ib

    90.2 ib

    -

    -

    1200

    29.4 ib

    36.7 ib

    45.9 ua

    57.2 ib

    67.9 ib

    88.2 ib

    -

    -

    -

    1400

    34.3 ib

    42.9 ib

    53.5 ib

    66.7 ib

    82.4 ib

    102.9 ib

    -

    -

    -

    1600

    39.2 ib

    49

    61.2 ib

    76.2 ib

    94.1 ib

    117.6 ib

    -

    -

    -

     

    PE100-RC Super Tough Polythylene Yeeb Nkab Lub Cev thiab Mechanical Properties

     

    Tsis muaj.

    Kev ua tau zoo

    Chav tsev

    Kev xav tau

    Kev xav tau

    Kev xav tau

    1

    Hydrostatic zog

    h

    Tsis muaj kev puas tsuaj,

    tsis muaj dej paug

    20 ℃, 12.0MPa, ≥100h

    GB/T 6111

           

    80 ℃, 5.4MPa, ≥165h

     
           

    80 ℃, 5.0MPa, ≥1000h

     

    2

    Elongation thaum so

    e≤5mm

    %

    ≥ 350b, c

    hom 2d 100mm / min

    GB/T 8804.3

     

    Elongation thaum so

    5 hli ≤ 12mm

        hom 1d 50mm / min  
     

    Elongation thaum so

    e 12mm

        hom 1d 25mm / minhom 3d 10mm / min  

    3

    Slow crack loj hlob kuj (pipe cone test)) en≤5mm

    mm/48h

    <1

    80 ℃

    GB/T 19279

    4

    Slow crack growth resistance (pipe notch test) en>5mm

    h

    Lub sijhawm tsis ua haujlwm ≥8760

    80 ℃, 0.92 MPa

    (kuaj siab)

    GB/T 18476

    5

    Tag nrho incision creep test (FNCT)

    h

    Lub sijhawm tsis ua haujlwm ≥8760

    80 ℃, 4.0MPa, 2% nonylphenol polyoxyethylene ether kua

    DIN/PAS 1075

    6

    Point load test

    h

    Lub sijhawm tsis ua haujlwm ≥8760

    0 ℃, 4MPa, 2% nonylphenol polyoxyethylene ether kua

    DIN/PAS 1075

    7

    Fast Crack loj hlob tsis kam (RCP)

    Mpa

    Pcs≥MOP/2.4-0.072

    -

    GB/T 19280

    8

    Compression rov qab

    -

    Pcs≥MOP/2.4-0.072

    0 ℃

    GB/T 15558.1-2015

    9

    Thermal stability

    min

    > 20

    200 ℃

    GB/T 19466.6

    10

    Thermal stability (MFR)

    g/10 min

    hloov ua ntej thiab tom qab ua

    <20%

    5kg, 190 ℃

    GB/T 3682

    11

    Longitudinal retraction (phab ntsa thickness ≤16mm)

    %

    ≤3, tsis muaj kev puas tsuaj

    110 ℃, 200 hli, 1h

    GB/T 6671

    ib.Tsuas yog brittle tsis ua hauj lwm yog xam.Yog tias qhov ua tsis tiav ua ntej 165h, qhov kev ntxhov siab qis dua thiab lub sijhawm ua haujlwm yam tsawg kawg nkaus raug xaiv raws li tus qauv kom rov kuaj dua.

    b.Yog tias qhov kev puas tsuaj tshwm sim sab nraum tus qauv kev ncua deb, qhov kev ntsuam xyuas raug txiav txim siab kom dhau yog tias qhov ntsuas tus nqi ua tau raws li qhov yuav tsum tau ua.

    c.Thaum tus nqi xeem yuav tsum tau mus txog, qhov kev xeem tuaj yeem nres yam tsis tas yuav kuaj kom txog thaum tus qauv puas lawm.

    d.Yog tias ua tau, cov yeeb nkab nrog phab ntsa tuab tsis ntau dua 25mm kuj tuaj yeem siv hom 2 qauv, hom 2 qauv los ntawm kev siv tshuab lossis molding.

    e.Rau cov nqi siab sib xws rau lwm yam SDR series, saib GB/T 18476.

    f.Kev kuaj RCP yuav tsum tau ua tsuas yog thaum cov yeeb nkab uas tsim los ntawm cov yeeb nkab tsim muaj ntau dua li cov phab ntsa tuab ntawm cov yeeb nkab uas siv rau hauv RCP qhov kev xeem muab los ntawm cov khoom sib xyaw ua ke.Thaum ua ntawv thov qis dua 0 ° C, RCP kev ntsuam xyuas yuav tsum tau nyob rau ntawm qhov ntsuas kub no los txiav txim siab qhov tseem ceeb ntawm qhov ntsuas kub tsawg kawg nkaus. Thaum kuaj raws li GB / T 19280, yog tias qhov kev xeem S4 tsis ua raws li qhov yuav tsum tau ua, qhov kev xeem yuav tsum tau rov kuaj dua raws li qhov kev xeem tag nrho, thiab cov txiaj ntsig ntawm qhov ntsuas tag nrho yuav tsum tau siv los ua qhov kev txiav txim zaum kawg. hauv paus.

    Txais tos tiv tauj peb kom paub meej cov khoom thiab kev pabcuam tshaj lij.

    Thov xa email rau: chuangrong@cdchuangrong.com  los yog Tel:+86-28-84319855

    Cov kav dej HDPE tau muaj nyob txij li nruab nrab 50′s.Cov kev paub dhau los qhia tias HDPE kav dej yog kev daws teeb meem rau cov yeeb nkab feem ntau tau lees paub los ntawm cov neeg siv khoom thiab cov kws pab tswv yim engineering raws li cov khoom siv yeeb nkab zoo tshaj plaws rau ntau lub siab thiab tsis paub meej cov ntawv thov los ntawm dej thiab roj xa mus rau lub ntiajteb txawj nqus, cov kav dej thiab cov dej ntws tawm rau ob qho tib si tshiab. & Rehabilitation Projects.Chuangrong polyethylene kav yog ua los ntawm polytholefin thermoplastic resin uas tseem yog cov khoom siv tsis muaj tshuaj lom, yog li, nws tsim nyog rau ntau yam kev siv.

    Haum rau:

    Dej Kev muab khoom. ChuangrongPE kav dej yog tsim los ntawm cov khoom ua tau raws li qhov yuav tsum tau muaj toxicity ntawm WHO thiab qhov no tuaj yeem siv rau kev thauj mus los ntawm cov dej haus.

    - Cov kav dej thiab cov khoom siv nrog kev ntsuas siab ntawm SDR 7.4 txog SDR 41 rau cov kav dej thiab cov kav dej xa dej thiab cov kab kev pabcuam.

    - Cov kav dej thiab fittings rau lub caij nplooj ntoos hlav dej chamber kav.

    -Ascending kav rau qhov dej.

    Hauv kev sib piv rau cov kav dej npau npau ntawm cov hlau lossis cov hlau tsis huv, HDPE cov kav dej yog lub teeb yuag thiab tiv taus corrosion.Tsis muaj av qaub los yog dej " txhoj puab heev" yuav tsis cuam tshuam rau cov khoom.Tsis tas li ntawd, cov khoom siv corrosion, uas feem ntau cuam tshuam kev ua haujlwm ntawm cov kav dej, raug zam.Hauv kev sib piv rau cov kav dej PVC, cov kav dej HDPE yog qhov hloov tau yooj yim dua thiab muaj kev cuam tshuam zoo txawm tias nyob hauv xoom kub.Cov kav dej tuaj yeem hloov kho tau yooj yim rau qhov trench layout yam tsis muaj kev siv cov fittings ntxiv. Ntawm qhov tod tes, kev pheej hmoo ntawm kev puas tsuaj vim qhov kev tuav hnyav ntawm qhov chaw tsim kho yog tsawg.HDPE piping systems (spigot thiab qhov (socket) pob qij txha) muaj ntau yam kev sib txuas ntawm txoj kev sib tshuam ntev.Yog li, kev teeb tsa ntawm cov thauj tog rau nkoj lossis cov thrust blocks tsis tsim nyog thiab cov ntaub ntawv pov thawj xau nrog lub neej ntev yog lav.

    Kev haus dej ntau tshaj dej zoo.Qhov tsim nyog ntawm cov khoom siv rau cov dej haus yog ua kom ntseeg tau los ntawm kev sim ywj pheej.Nej tsis muaj qhov saj lossis tsis hnov ​​tsw ntawm cov dej haus yog cuam tshuam vim kev sib cuag nrog cov kav dej HDPE.Tus nto du thiab lub siab abrasion kuj lav yam tsawg kawg nkaus deposits.Polyethylene yog corrosion resistant, yog li ntawd, cov dej haus tsis tuaj yeem kis tau los ntawm corrosion los ntawm cov khoom xws li tooj liab lossis cov hlau hnyav xws li cadmium lossis txhuas, uas tshwm sim ntau zaus nrog cov kav hlau kav hlau.

     

    Ib puag ncigCov khoom siv zoo rau ib puag ncig huv. Cov HDPE cev thiab haum yog nkaus xwb ua los ntawm cov ntaub ntawv zoo ib puag ncig.Piv txwv li, lub zog xav tau rau kev tsim cov kav dej HDPE yog qis dua n tshwm sim los ntawm kev tsim cov kav dej yog ua los ntawm polyethylene.Daim ntawv thov ntawm HDPE piping systems muab cov kev daws teeb meem zoo tshaj plaws rau ib puag ncig.Ib qho 100% cov ntaub ntawv pov thawj xau tuaj yeem raug ntsia nrog txoj kev vuam yooj yim.Yog li, kev tsim txom cov dej haus nrog cov tshuaj lom raug txo.Tsis tas li ntawd, kev poob dej vim cov kav dej xau raug zam.Tsis muaj lwm qhov system muab cov khoom zoo li no.

    Rau kawg tej yam kev mob. HDPE piping systems tau pom zoo rau kev teeb tsa hauv txhua hom av.Polyethylene yog ib qho yooj yim siv ntawm ntau yam kev sib koom ua ke encases cov ntaub ntawv pov thawj xau.Vim lub teeb yuag thiab txoj kev sib koom ua ke yooj yim, HOPE cov kav dej yog qhov tsim nyog rau cov xwm txheej tsis zoo- rau kev teeb tsa hauv thaj av nyuaj.

    Dej ntws.ChuangrongCov kav dej yog siv rau cov dej hauv av rau cov tsev, cov kab khib nyiab rau cov kua dej corrosive thiab tseem yog cov khoom siv zoo tshaj plaws rau cov chaw tsim khoom ntawm cov kav dej loj loj rau cov kav dej phwj tuaj. underground dej phwj thiab cov kav dej pov tseg.

    Kev lag luam.Cov yam ntxwv zoo li corrosion-resistance, yooj yim installation, lub teeb yuag, thiab yooj ua rau chuangrong kav dej zoo tagnrho rau cov kav dej nyuaj hauv factories.Lawv zoo tagnrho rau cov tshuaj corrosive.

    Roj thiab Roj Pipeline Cov txheej txheem. PEcov kav dej rau kab carbon steel kav mus thauj cov roj & gases ntawm siab dua yog avail-tau.Cov kav dej tau tsim tshwj xeeb nrog lub ntsej muag du thiab ua kom yooj yim rau nruab.Yog li roj kab tuaj yeem ntsia tau ntawm tus nqi qis.Nyob rau hauv drilling lawv yog siv raws li txhaj-qhov casings raws li lawv yog pheej yig dua.Vim cov khoom zoo heev ntawm HDPE, uas ua rau muaj kev cuam tshuam lub zog thiab zoo heev aggressive xau.Combined nrog yooj yim ntawm tuav thiab installation, HDPE kav yog zoo heev rau thauj khoom thiab lwm yam roj xws li bio-gas.

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    CHUANGRONG muaj cov txheej txheem tshawb nrhiav tiav nrog txhua yam ntawm cov cuab yeej tshawb nrhiav siab heev kom ntseeg tau tias kev tswj hwm zoo hauv txhua qhov txheej txheem los ntawm cov khoom siv raw mus rau cov khoom tiav.Cov khoom lag luam tau ua raws li ISO4427/4437, ASTMD3035, EN12201/1555, DIN8074, AS / NIS4130 tus qauv, thiab pom zoo los ntawm ISO9001-2015, CE, BV, SGS, WRAS.

    CE-PE-PIPE-FITTING
    ISO CERTIFICATE

    Xa koj cov lus rau peb:

    Sau koj cov lus ntawm no thiab xa tuaj rau peb

    Xa koj cov lus rau peb:

    Sau koj cov lus ntawm no thiab xa tuaj rau peb