Yuav ua li cas SDR thiab phab ntsa tuab txiav txim PN qib ntawm HDPE yeeb nkab: kub derating, txheej txheem kuaj hydrostatic, thiab yam uas yuav tsum muaj hauv daim ntawv kuaj siab.
Oct 24, 2026
Tso lus
PN, SDR, thiab phab ntsa tuab tsuas yog peb txoj kev saib tib tus naj npawb. Phau ntawv qhia no piav qhia yuav nyeem daim ntawv ntsuas siab ntawm HDPE raj li cas, yuav ua li cas kub cuam tshuam rau nws, thiab yuav ua li cas thiab sau tseg qhov kev kuaj hydrostatic kom paub tseeb tias ib qho raj lossis qhov txuas zoo siv.
Peb tus lej uas piav txog tib lub raj
Yuav luag txhua lo lus nug uas tus neeg yuav khoom nug peb txog siab yeej los ntawm ib qho kev tsis to taub: PN, SDR, thiab phab ntsa tuab zoo li peb yam sib txawv, tab sis tiag tiag lawv tsuas yog peb txoj kev saib tib yam geometry xwb. Teem ib qho ntawm lawv, ces ob qhov seem yuav raug txiav txim. Thaum koj tau txais qhov ntawd, nyeem daim ntawv ntsuas siab tsis yog kev kwv yees lawm.
PN - nominal pressure
PN yog qhov siab tshaj plaws ua haujlwm, hauv bar, uas lub raj tsim los ua haujlwm txuas ntxiv rau 50 xyoo thaum nqa dej ntawm 20°C. PN16 tsis txhais tau tias nws tawg thaum 16 bar. Nws txhais tau tias lub raj tuaj yeem khiav ntawm 16 bar, tag nrho hnub, txhua hnub, rau 50 xyoo, ntawm qhov kub ntawd. Qhov siab tawg tiag tiag ntawm ib lub raj PE100 yog kwv yees peb npaug ntawm PN, uas yog qhov chaw muaj kev nyab xeeb.
SDR - qhov piv ntev qauv
SDR yog qhov dav sab nraud faib los ntawm phab ntsa tuab: SDR = dn / t. SDR qis dua txhais tau tias phab ntsa tuab dua thiab siab dua. Nws yog tus naj npawb uas yuav tsum muab thaum koj txiav txim fittings, vim tiaselectrofusion fittingNws tsim rau SDR tshwj xeeb – coupling tsim rau SDR11 yuav tsis haum rau SDR17 raj uas muaj qhov loj tib yam.
t - wall thickness
Phab ntsa tuab yog yam tiag tiag uas lub tshuab ua thiab yam koj xyuas ntawm qhov chaw. Nws muaj kev tso cai, yog li qhov tseem ceeb rau siab yog SDR, tsis yog tsuas yog ib qho micrometer ntsuas xwb. Yog tus neeg muab khoom hais tias "PE100 dn110" tsis hais txog SDR, qhov nqi tsis tiav – dn110 muaj SDR7 mus txog SDR41, thiab qhov siab ntsuas hloov ntau heev thoob plaws qhov ntawd.
Los ntawm SDR mus rau PN: Ib qho qauv
Txhua qib siab hauv PE catalogue los ntawm tib qho kev suav yooj yim, coj los ntawm EN 12201, ISO 4427, thiab EN 1555:
Xyuas cov naj npawb ntawm cov chav kawm uas koj pom ntau tshaj plaws, thiab tag nrho tsev neeg yuav to taub:
PE100, SDR11
20 0 8.0 ÷ (11 − 1) = 16 bar →PN16Lub zog siab ua haujlwm rau cov kab hluav taws xob hauv kev lag luam, cov kua nplaum hauv qhov mining, thiab cov kab hluav taws xob saum av.
PE100, SDR17
20 0 8.0 ÷ (17 − 1) = 10 bar →PN10Qhov kev teeb tsa qauv rau cov dej thiab roj hauv nroog feem ntau qhov chaw.
PE100, SDR26
20 × 8.0 ÷ (26 − 1) = 6.4 bar →PN6.3(tus nqi catalog uas tau puag ncig). Kev siv zog hnyav qis thiab kev tso tawm uas muaj peev xwm ntws tseem ceeb dua qhov siab.
PE100 Qib Siab thiab Phab Ntsa Tuab Daim Ntawv Qhia
Phab ntsa tuab hauv millimeters, raws li cov rooj loj ntawm EN 12201-2 thiab ISO 4427-2. Koj tuaj yeem siv qhov no los xyuas ib qho nqi: yog tias ib tug neeg muab khoom muab dn110 SDR11 nrog phab ntsa nyias dua 10.0 mm, qhov kev thov tsis phim nrog qhov sau ntawm daim ntawv cim npe. Nco ntsoov xyuas cov naj npawb nrog qhov version uas koj qhov project thov, thiab nco ntsoov tias txhua SDR muaj nws tus kheej cov molded fittings.
| dn (mm) | SDR11 - PN16 | SDR17 - PN10 | SDR21 - PN8 | SDR26 - PN6.3 |
|---|---|---|---|---|
| 32 | 3.0 | 2.0 | – | – |
| 50 | 4.6 | 3.0 | 2.4 | – |
| 63 | 5.8 | 3.8 | 3.0 | 2.5 |
| 90 | 8.2 | 5.4 | 4.3 | 3.5 |
| 110 | 10.0 | 6.6 | 5.3 | 4.2 |
| 160 | 14.6 | 9.5 | 7.7 | 6.2 |
| 200 | 18.2 | 11.9 | 9.6 | 7.7 |
| 250 | 22.7 | 14.8 | 11.9 | 9.6 |
| 315 | 28.6 | 18.7 | 15.0 | 12.1 |
| 400 | 36.3 | 23.7 | 19.1 | 15.3 |
| 500 | 45.4 | 29.7 | 23.9 | 19.1 |
| 630 | 57.2 | 37.4 | 30.0 | 24.1 |
Tag nrho cov khoom siv mus txog DN1600, nrog txhua pawg SDR thiab electrofusion uas phim,butt fusionthiab cov series kev kho rooj zaum tau luam tawm hauv pebHDPE yeeb nkab fittings cov ntsiab lus tsev qiv ntawv- 65 daim ntawv qhia txog phab ntsa tuab, kev ntsuas siab, thiab qhov loj ntawm kev txuas rau txhua tsev neeg khoom.
Vim li cas PN thiaj poob tshaj 20°C?
Polyethylene yuav muag dua thaum nws sov, yog li nws tuaj yeem tiv taus kev ntxhov siab tsawg dua. Txhua qhov ntsuas siab hauv daim ntawv teev npe yog raws li 20°C, yog li ib lub raj nqa dej kub, dej khib nyiab hauv kev lag luam, lossis kab hauv av hauv huab cua kub tsis tuaj yeem khiav ntawm PN teev tseg. Ua ntej, siv qhov derating factor, tom qab ntawd tshem tawm koj qhov kev tso cai nce siab.
| Operating temperature | Qhov ntsuas txo (PE100, dej) | SDR11 - PN16 becomes | SDR17 - PN10 becomes |
|---|---|---|---|
| 20 °C | 1.00 | 16.0 bar | 10.0 bar |
| 25 °C | 0.93 | 14.9 bar | 9.3 bar |
| 30 °C | 0.87 | 13.9 bar | 8.7 bar |
| 35 °C | 0.80 | 12.8 bar | 8.0 bar |
| 40 °C | 0.74 | 11.8 bar | 7.4 bar |
| 45 °C | 0.67 | 10.7 bar | 6.7 bar |
| 50 °C | 0.61 | 9.8 bar | 6.1 bar |
Cov yam ntxwv feem ntau rau kev pabcuam dej. Nco ntsoov xyuas dua cov nqi hauv EN 12201-2 lossis ISO 4427-2 uas koj qhov project siv, thiab saib seb cov lus qhia ntawm tus neeg siv puas ntxiv ib qho qauv tsim ntxiv – ntau lub tuam txhab dej thov ntxiv 1.25 txog 1.5 safety factor rau kev nce siab.
Ob hom kev xeem siab sib txawv – Tsis txhob sib xyaw ua ke
Qhov kev sib xyaw uas peb pom ntau tshaj plaws hauv cov ntaub ntawv yuav khoom yog cov neeg yuav khoom thov lub hoobkas rau ib daim ntawv 'kev kuaj siab' thaum qhov chaw tiag tiag xav tau kev kuaj hydrostatic hauv teb, lossis qhov txawv. Lawv qhia tau cov txiaj ntsig sib txawv thiab muaj kev sib txawv ntawm cov siab.
Kev xeem tsim nyog rau lub Hoobkas
Qhov no qhia tias cov compound thiab daim duab kav ua haujlwm li cas. Nws yog kev sim rau cov kav dej, tsis yog txuas tiav, thiab qhov no yog li PE100 tau txais kev lees paub tag nrho. Raws li ISO 1167, PE100 kav dej raug kuaj ntawm:
• 20 °C / 100 teev ntawm hoop pressure 12.4 MPa
• 80°C / 165 teev ntawm 5.5 MPa
• 80°C / 1000 teev ntawm 5.0 MPa
Thov daim ntawv pov thawj rau pawg compound, tsis yog tsuas yog duab ntawm burst test xwb. Peb yam saum toj no yog qhov txawv ntawm PE100 resin tiag tiag ntawm compound uas tau txo qib lossis puv dhau.
Site hydrostatic test
Qhov no kuaj cov yeeb nkab uas tau teeb tsa thiab tag nrho nws cov txuas. Feem ntau, nws khiav ntawm 1.5 npaug ntawm qhov siab ib txwm rau ib teev, nrog kev kuaj siab txhua lub sijhawm. Cov kauj ruam los tiv thaiv kev ua yuam kev ntawm PE yog:
1. Soak.Ntim nws qeeb qeeb tsawg dua 0.5 m/s thiab cia lub raj zaum 12 txog 24 teev kom cua daj tawm thiab lub raj tsis nthuav ntxiv.
2. Pre-test.Nce mus txog 0.5 PN rau kaum feeb thiab tsis txhob khi dab tsi. Tsis txhob hnov qab tias kab nyob ruaj tsis muaj qhov ntws pom tau.
3. Test.Maj mam nce mus txog 1.5 PN thiab khaws cia ib teev, sau qhov siab txhua kaum feeb.
4. Allow for creep.Ib qho poob qis luv luv thiab rov qab hauv thawj ob peb feeb yog ib qho xwm txheej ib txwm muaj rau viscoelastic kev coj ua ntawm PE. Tsis txhob ntxiv dej kom tau qhov siab kuaj rov qab ua ntej pib lub sijhawm es tsis txhob hu ua kev ua tsis tiav.
5. Record.Sau tseg qhov kub ib puag ncig, dej kub, siab kuaj, ntev npaum li cas, dej ntxiv, thiab qhov tshwm sim rau txhua qhov txuas.
Cov network roj ua haujlwm txawv
Cov kab roj tsis tau kuaj hydrostatic – muab dej tso rau hauv lub raj roj yog ib qho teeb meem, tsis yog ib txoj kev pov thawj tias nws ua haujlwm. Cov kab roj raws li EN 1555 thiab ISO 4437 qauv raug kuaj zog thiab qhov xau siv cua lossis nitrogen ntawm qhov siab uas tus neeg tswj network teeb, thiab lawv muab sijhawm ruaj khov ntev dua vim roj compressed. Yog koj tab tom ua haujlwm rau ib lub network faib roj, xyuas txoj kev kuaj pneumatic thiab tus neeg ua haujlwm qhov siab tshaj plaws (MOP) es tsis txhob saib qhov siab kuaj dej.
Dab Tsi Ib Daim Ntawv Qhia Kev Ntsuas Siab Yuav Tsum Muaj
Ib daim ntawv qhia uas tsuas hais tias 'kev xeem dhau' tsis muaj txiaj ntsig thaum hloov chaw. Nco ntsoov tias koj daim ntawv qhia muaj tag nrho cov no ua ntej kos npe.
| Item | Why it matters |
|---|---|
| Line identification | Qhov dav ntawm yeeb nkab, SDR, thiab qib khoom siv rau txhua ntu, yog li kev kuaj tuaj yeem txuas nrog daim ntawv pov thawj xa khoom |
| Xyuas qhov siab thiab ntev npaum li cas nws nyob | Pov thawj tias 1.5 × 10⁰ PN (lossis tus nqi teev tseg) tau mus txog thiab khaws cia tag nrho ib teev |
| Pressure log | Kev nyeem ntawv tau ua raws sijhawm, tsis yog tsuas yog ib qho kev ntsuas pib mus txog kawg xwb |
| Make-up water volume | Qhov ntsuas xau tiag tiag ntawm PE line – kev ntxiv me me, ruaj khov yog ib yam uas ib txwm muaj, tab sis kev nce tsis yog |
| Temperature record | Ob qho cua thiab dej, vim 10°C swing hloov qhov nyeem siab ntawm kab ntev |
| Joint traceability | Ib daim ntawv sau fusion barcode lossis welding-machine rau txhua qhov txuas uas tau kuaj, yog li koj tuaj yeem taug qab txhua qhov tsis ua haujlwm rov qab mus rau tus neeg ua haujlwm thiab pawg fittings |
| Instrument calibration | Cov ntawv pov thawj gauge thiab logger uas siv tau rau hnub kuaj |
| Result and signature | Lub npe ntawm tus thawj coj, hnub tim, thiab txoj cai txais uas siv |
Tsib qhov yuam kev uas ua rau koj tsis dhau kev xeem siab
1. No soak period
Ntim thiab muab siab tib lub sijhawm ua rau huab cua yaj hauv kab. Siab ces poob thaum huab cua yaj, thiab tus neeg ua haujlwm xav tias yog xau. Nqus dej ua ntej.
2. Kev sim ntawm qhov siab tsis raug
Siv 1.5 × qhov siab ua haujlwm es tsis yog 1.5 × PN yog ib qho nrov thiab kuaj tsis txaus txoj kab. Ntawm ib qho dej kub uas tau txo qis, tus naj npawb raug yog 1.5 × qhov siab tso cai txo qis, tsis yog qhov PN hauv phau ntawv teev npe.
3. Thrust thiab anchor blocks uas tsis tau siv
Rau ib lub raj PE uas tau muab tso rau hauv av, cov txuas thiab qhov tawg tuaj yeem hloov thaum kuaj, tshwj tsis yog tias cov khoom ntim rov qab tau ntim kom ruaj thiab cov anchors tau teeb tsa kom ruaj. Yog tias ib qho txuas qhib thaum kuaj, feem ntau nws tsuas yog txhais tau tias nws tsis tau ruaj khov, thiab tej zaum lub raj nws tus kheej tseem nyob zoo.
4. Nyeem gauge ntawm qhov kawg tsis yog
Ntawm lub mains uas nce ntev, lub taub hau static ntxiv rau qhov koj pom ntawm qhov chaw qis. Qhov siab kuaj yuav tsum ntsuas los ntawm qhov siab tshaj plaws ntawm qhov chaw, rho tawm lub taub hau yog tias lub gauge qis dua nws.
5. Rov sim ib qho joint uas tsis ua haujlwm es tsis txhob txiav tawm xwb
Ib qho txuas uas ntws dej ib zaug twb puas lawm. Rau PE, txoj kev kho kom raug yog txiav tawm qhov txuas thiab hloov nrog ib qho khoom tshiab, lossis muab ib lub saddle kho rau saum qhov chaw puas. Tsis txhob nias siab rau qhov txuas tib yam kom "saib nws puas tuav" yuav ua rau teeb meem mus rau kev sim.
Cov Lus Nug Nquag Nug
Rau lo lus nug uas cov neeg yuav khoom thiab cov kws tsim chaw ua haujlwm feem ntau nug peb txog kev ntsuas siab.
PN puas yog tib yam li qhov siab tshaj plaws ua haujlwm?
Tsis yog. PN yog qhov siab tso cai ntawm 20°C rau lub neej tsim 50 xyoo. Qhov siab tshaj plaws ua haujlwm hauv koj lub system yog PN times qhov kub derating factor, thiab tom qab ntawd txo qis dua rau tej yam xws li surge lossis dej hammer. Ntawm kab 40°C, PN16 raj muab qhov siab tso cai txog 11.8 bar ua ntej suav surge.
Koj puas siv tau ib qho fitting uas muaj qib qis dua rau ib kab siab siab dua?
Tsis txhob. Qhov siab ntsuas ntawm fusion fitting, saddle, lossis valve yuav tsum siab npaum li lub raj uas nws txuas rau. Ib qho joint tsuas muaj zog raws li nws qhov weakest xwb, thiab kev sim luv luv yuav tsis pom ib qho fitting uas tsis tsim rau hom ntawd.
Ib qho kev kuaj siab ntawm qhov chaw yuav tsum siv sijhawm ntev npaum li cas?
Ib teev ntawm 1.5 PN yog qhov kev qhia ib txwm rau kev pab dej, tom qab ntxuav dej thiab kuaj ua ntej nrog siab qis. Qee zaus tus neeg siv thov kom tuav ntev dua, tab sis lub sijhawm ntxiv feem ntau tsis qhia dab tsi uas thawj teev tsis pom – nws tsuas yog kuaj cov pa hauv dej xwb.
Vim li cas qhov siab thiaj poob thaum kuaj txawm tias tsis muaj qhov xau?
Polyethylene yog viscoelastic. Thaum nias ntev, phab ntsa raj maj mam nthuav dav, qhov ntim ntawm raj nce, thiab siab poob. Nws yog ib qho xwm txheej uas pom poob sai sai hauv ob peb feeb thawj, tom qab ntawd qib ruaj khov. Tab sis yog siab poob mus ntxiv thiab koj yuav tsum ntxiv dej ntxiv, qhov ntawd yog qhov xau.
Puas yog qib SDR siab dua txhais tau tias lub raj phem dua?
Tsis yog, nws txhais tau tias ib hom haujlwm txawv. SDR26 raj ntawm PN6.3 yog qhov zoo rau ib lub raj dej gravity lossis lub raj dej siab tsawg. Koj tsuas yog tsis tuaj yeem siv nws thaum xav tau 10 bar. Kev yuam kev yog xaiv raws li qhov dav xwb thiab xav tias phab ntsa tuab dua yeej muaj nqi zoo dua – nws kim dua, txo qhov bore, thiab txo kev ntws.
Cov ntaub ntawv twg yuav tsum nrog lub raj thiab cov khoom txuas?
Rau txhua pawg: ib daim ntawv pov thawj khoom qhia txog cov khoom thiab nws qib, ib daim ntawv tshuaj xyuas qhov ntev piv rau SDR uas tau xaj, thiab ISO 1167 cov txiaj ntsig kev kuaj hydrostatic rau cov khoom sib xyaw. Rau txhua qhov txuas fusion: tus lej taug qab, cov parameter vuam rau lub tshuab siv, thiab tus cim qhia fusion yog tias muaj. Cov ntaub ntawv no ua ke ua rau ib qho kev kuaj siab muaj txiaj ntsig-lawv qhia tau qhov tseeb uas tau kuaj.
Kev nyeem ntxiv
Puas Xav Tau Cov Khoom Siv Rau Koj Qhov Siab Kab?
Peb tsim electrofusion, butt fusion, thiab saddle fittings rau PE100 kab los ntawm dn20 txog dn1200, nrog cov ntsuas siab uas phim koj lub raj SDR thiab cov ntaub ntawv kuaj uas koj xav tau hauv koj qhov project. Xa peb dn, SDR, thiab cov qauv uas koj tab tom ua raws, peb yuav rov qab nrog koj nrog ib qho kev qhia thiab nqi.
Xa kev nug