Kev nkag mus rau hauv kev lag luam Bangladesh muaj kev cia siab, tab sis cov cai tsis paub tuaj yeem ua rau koj ntes tau. Ib qho kev ua yuam kev yooj yim tuaj yeem ua rau koj cov khoom xa tuaj tsis raug lees paub, ua rau koj poob sijhawm thiab nyiaj txiag.

Rau Bangladesh, tsom mus rau ASTM cov qauv, tshwj xeeb tshaj yog D1785 rau qhov loj ntawm cov yeeb nkab thiab D2466 rau kev sib txuas cov qhov (sockets). Koj tseem yuav xav tau daim ntawv pov thawj ua ntej xa khoom (PSI) los ntawm lub koom haum tau pom zoo kom dhau kev lis kev cai tau zoo.

Kuv tau hu xov tooj nrog ib tus khub uas tab tom nrhiav kev nthuav dav mus rau hauv cov lag luam tshiab hauv South Asia. Nws txaus siab heev rau Bangladesh vim nws txoj kev lag luam kev tsim kho uas loj hlob tuaj. Peb siv sijhawm feem ntau los tham txog qee yam uas ntau tus neeg tsis quav ntsej: nws tsis yog tsuas yog nrhiav cov neeg siv khoom xwb. Kev vam meej nyob ntawm kev ua tau raws li lub tebchaws cov qauv tshwj xeeb.cov qauv zoo thiab cov kev cai ntawm kev lis kev caitxij hnub thawj. Yog ua yuam kev no txhais tau tias koj cov khoom yuav tsis tawm ntawm chaw nres nkoj li. Cia peb piav qhia txog yam koj yuav tsum paub.

Cov qauv ASTM rau cov kav dej PVC yog dab tsi?

Koj pom "ASTM" ntawm daim ntawv qhia txog cov khoom, tab sis nws tsuas yog cov ntawv thiab cov lej sib xyaw ua ke xwb. Kev xaiv cov khoom uas ua raws li tus qauv tsis raug txhais tau tias koj cov khoom siv yuav tsis txuas nrog cov kav dej hauv zos kom zoo.

Cov qauv ASTM tseem ceeb tshaj plaws yog D1785 rau cov yeeb nkab raws sijhawm (xws li Sch 40/80) thiab D2466/D2467 rau cov qhov (socket) thiab cov khoom siv threaded. Cov no txhais qhov ntev tseeb rau kev sib txuas zoo meej, tsis xau.

ASTM sawv cev rau American Society for Testing and Materials. Cov qauv no siv thoob ntiaj teb los xyuas kom meej tias zoo thiab sib xws. Rau tus neeg xa khoom uas tsom mus rau Bangladesh, lawv tsis yog xaiv tau; lawv yog hom lus ntawm kev ua lag luam. Thaum koj xaj ib qho khoom siv uas ua raws liASTM D2466, koj paub tias nws lub qhov (socket diameter) thiab qhov tob raug tswj kom meej. Qhov no lav tias nws yuav haum zoo rau txhua lub yeeb nkab PVC uas tsim los rauASTM D1785tus qauv. Nws tshem tawm qhov kev kwv yees thiab kev pheej hmoo ntawm kev tsis sib xws. Kev nkag siab txog cov lej no yog thawj kauj ruam los muab cov khoom lag luam txhim khu kev qha.

Cov Qauv ASTM Tseem Ceeb rau PVC

Cov txheej txheem rau qhov zoo ntawm cov yeeb nkab PVC yog dab tsi?

Ob lub qhov dej PVC dawb yuav zoo ib yam, tab sis ib qho ruaj khov thaum lwm qhov tsis yooj yim tawg. Koj yuav tsum paub yuav ua li cas txheeb xyuas qhov zoo ua ntej koj yuav, tsis yog tom qab tus neeg siv khoom lub kaw lus tsis ua haujlwm.

Cov yam ntxwv tseem ceeb ntawm kev zoo yog cov khoom siv huv (100% PVC tshiab), qhov tseeb ntawm qhov ntev, qhov ntsuas siab, thiab kev tiv taus kev cuam tshuam. Cov no tau txheeb xyuas los ntawm kev sim xws li kev sim siab tawg thiab kev sim tiaj tiaj, kom ntseeg tau tias muaj kev ntseeg siab mus sij hawm ntev.

Kev sib dhos zoo pib nrog cov khoom siv zoo. Peb tsuas yog siv100% PVC resin tshiabQee cov chaw tsim khoom sib xyaw ua kecalcium carbonatelossis cov khoom siv rov ua dua tshiab kom txo tus nqi. Qhov no ua rau cov khoom kawg tsis muaj zog thiab tawg yooj yim dua, yooj yim tawg thaum muaj kev nyuaj siab lossis thaum muaj kev cuam tshuam. Tshaj li cov khoom siv, qhov zoo yog hais txog kev tswj hwm. Peb cov khoom tsim tawm tsis siv neeg ua kom txhua qhov sib dhos ua tau raws li cov qauv qhov ntev. Tom qab ntawd, peb ua qhov kev sim ua ke nruj heev. Akev sim siab tawgqhia peb txog qhov siab tshaj plaws uas nws tuaj yeem ua tau ua ntej ua tsis tiav. Kev sim ua kom tiaj tiaj qhia tau tias nws tuaj yeem hloov pauv thaum muaj kev ntxhov siab yam tsis tawg. Cov kev sim no yog koj qhov kev paub tseeb tias cov khoom tsis yog tsuas yog cov yas dawb xwb; nws yog ib qho khoom tsim uas npaj rau txoj haujlwm nyuaj.

Cov cai lij choj rau kev xa khoom tuaj rau Bangladesh yog dab tsi?

Koj cov khoom xa tuaj txog ntawm chaw nres nkoj Chittagong, tab sis nws daig vim tias koj tsis muaj ib daim ntawv tseem ceeb. Tam sim no koj yuav tsum them tus nqi khaws cia txhua hnub thiab koj tus neeg yuav khoom tab tom ntxhov siab.

Yuav kom xa khoom mus rau hauv Bangladesh, koj yuav tsum muaj daim ntawv pov thawj Pre-Shipment Inspection (PSI) los ntawm lub koom haum NBR-pom zoo. Daim ntawv pov thawj no yog qhov yuav tsum tau ua rau kev tshem tawm kev lis kev cai thiab txheeb xyuas qhov zoo, ntau npaum li cas, thiab tus nqi ntawm cov khoom.

Qhov no yog txoj cai tseem ceeb tshaj plaws rau txhua tus neeg xa khoom tuaj rau Bangladesh. Pawg Neeg Saib Xyuas Kev Them Se Hauv Tebchaws (NBR) xav kom feem ntau cov khoom xa tuaj raug tshuaj xyuas.ua ntejlawv tawm hauv lub tebchaws keeb kwm. Qhov no hu ua aKev Tshuaj Xyuas Ua Ntej Xa Khoom, lossis PSI. Ua tus tsim khoom, peb ua haujlwm nrog lub tuam txhab tshuaj xyuas NBR uas tau pom zoo xws li SGS, Bureau Veritas, lossis Intertek. Lawv tuaj rau peb lub Hoobkas, tshuaj xyuas cov khoom kom paub tseeb tias lawv phim koj daim ntawv xaj, thiab tom qab ntawd muab daim ntawv pov thawj kaw. Daim ntawv no ua pov thawj rau Bangladesh cov neeg lis kev cai tias cov khoom yog raws li tau piav qhia thiab ua tau raws li cov qauv tsim nyog. Yog tsis muaj daim ntawv pov thawj no, koj cov khoom xa tuaj yuav ntsib kev ncua sijhawm loj, rov tshuaj xyuas dua, thiab tej zaum yuav raug nplua. Peb tswj cov txheej txheem no rau peb cov neeg koom tes kom ntseeg tau tias lawv cov khoom xa tuaj muaj kev mus ncig zoo.

HS code rau PVC yeeb nkab fittings yog dab tsi?

Koj tab tom sau koj daim ntawv them nqi lag luam thiab daim ntawv pov thawj xa khoom. Kev siv tus lej HS tsis raug tuaj yeem ua rau muaj se tsis raug, raug nplua, lossis txawm tias raug liam tias tau tshaj tawm tsis raug los ntawm cov neeg lis kev cai.

Tus lej HS tseem ceeb rau cov khoom siv yeeb nkab PVC yog 3917.40.00. Tus lej no hais txog "Cov khoom siv rau cov raj, cov kav dej thiab cov hoses, ntawm cov yas." Kev siv tus lej meej no ua kom koj cov khoom xa tuaj raug cais kom raug.

LubCov lej ntawm Harmonized System (HS)yog ib hom lus thoob ntiaj teb rau kev faib cov khoom rau kev lis kev cai. Kev ua kom raug yog qhov tseem ceeb. Cia peb piav qhia3917.40.00:

• Tshooj 39:Cov yas thiab cov khoom ntawm nws.
• Nqe 3917:Cov raj, cov kav dej thiab cov hoses, thiab cov khoom siv rau cov ntawd, ua los ntawm yas.
• Nqe lus 3917.40:Cov khoom siv.

Qib kev meej no qhia rau cov tub ceev xwm hauv Bangladesh paub meej tias muaj dab tsi nyob hauv koj lub thawv. Cov lej no txiav txim siab tus nqi ntawmse ntshuamkoj yuav them. Tus lej tsis raug yuav ua rau muaj kev ncua sijhawm ntev thaum cov tub ceev xwm rov faib koj cov khoom. Ib txwm xyuas kom meej tias tus lej no tau hais meej meej rau ntawm tag nrho koj cov ntaub ntawv xa khoom kom tsis txhob muaj teeb meem ntawm chaw nres nkoj. Nws yog ib qho me me uas yuav pab koj kom tsis txhob muaj teeb meem loj.

Xaus lus

Kev vam meej hauv Bangladesh yuav tsum tau ua kom tiav cov qauv ASTM, xyuas kom zoo, tau txais daim ntawv pov thawj PSI, thiab siv cov lej HS kom raug. Tau txais cov no kom raug los tsim kom muaj kev lag luam xa khoom tuaj muaj zog thiab muaj txiaj ntsig.