Chitoliro chachitsulo cha DNV-OS-F101 L450 SAWL Subsea Pipeline: Mphamvu Zopangira & Zofotokozera Zamalonda

Chifukwa chiyani Womic Steel imagwiritsa ntchito DNV Offshore Pipe?

● Wopanga mapaipi a SAWL wovomerezeka ndi DNV GL

● Njira ya UOE yokhala ndi 6,000t O-press ndi 72-segment expander - ovality ≤ 0.15%

● Kutha kuyesa CTOD mkati mwa nyumba (labu yovomerezeka ndi CNAS)

● Mbiri yakale kwambiri pa ntchito za North Sea, Brazil, ndi West Africa

● Kafukufuku wa chipani chachitatu wochitidwa ndi DNV, ABS, BV, kapena woimira kasitomala

● Kutsatira kwathunthu DNV-OS-F101 (kuphatikiza Annex A, B, D ngati pakufunika)

Mafunso Ofunsidwa Kawirikawiri:

Q: Kodi kusiyana pakati pa DNV-OS-F101 L450 ndi API 5L X65 pa sitima yapansi pa nyanja ndi kotani?
A: DNV-OS-F101 yalembedwa makamaka pa mapaipi akunja. Kusiyana kwakukulu: kulekerera kokhwima kwa dzira (0.2% vs 0.5%), kuyesa kulimba kwa CTOD (kosafunikira ndi API 5L), zofunikira zapamwamba za Charpy impact (nthawi zambiri 50J vs 27J), zofunikira zina zotsutsana ndi kugwa ndi kapangidwe ka kutopa. Pa mapulojekiti akuya, DNV ndiye muyezo womwe umakondedwa.

Q: Kodi mumapereka mayeso a CTOD a zitsulo zosungunula ndi HAZ?
A: Inde. Timachita mayeso a CTOD (Crack Tip Opening Displacement) motsatira BS 7448 kapena ASTM E1820. Tikhoza kuyesa pa -20°C, -30°C, -46°C, kapena monga momwe tafotokozera. Zotsatira zachizolowezi: weld metal δ ≥ 0.35mm, HAZ δ ≥ 0.40mm. Mayeso a CTOD amawonedwa ndi wofufuza wa DNV.

Q: Kodi mungapereke L450 kuti igwiritsidwe ntchito ngati sour service (H₂S)?
A: Inde. Timapereka L450 ndi sour service supplement pa DNV-OS-F101 Annex A. Izi zimafuna CEV yotsika (≤ 0.40%), Mo addition (0.15-0.25%), PWHT, hardness ≤ 85 HRB, ndi mayeso a HIC/SSC. Tapereka sour service L450 ku North Sea ndi Middle East offshore projekiti.

Q: Kodi mapaipi anu amatha kupirira madzi otani?
A: Kukana kugwa kumadalira chiŵerengero cha D/t (m'mimba mwake/kukhuthala kwa khoma), kupendekera, ndi mphamvu yobereka. Pa chitoliro cha L450 UOE chodziwika bwino chokhala ndi D/t = 30 (mwachitsanzo, 610mm × 20mm) ndi kupendekera kwa 0.2%, kuthamanga kwa kugwa kumapitirira 30 MPa (yofanana ndi kuya kwa madzi kwa 3,000m). Pa madzi akuya, tikhoza kupanga makoma okhuthala kapena kupendekera kwa dzira kolimba. Chonde perekani kupendekera kwa madzi ndi kuthamanga kwa kapangidwe kake kuti muwunike kupendekera.

Q: Kodi kafukufuku wa DNV akufunika pa kutumiza kulikonse?
Yankho: DNV-OS-F101 imafuna kuti wopanga akhale ndi dongosolo lovomerezeka la khalidwe labwino komanso kuti kupanga kufufuzidwe ndi DNV pamalo odziwika bwino (monga mayeso a hydrostatic, CTOD, kuyang'aniridwa kwa dimensional). Malo a Womic amawunikidwa chaka chilichonse ndi DNV. Pa oda iliyonse, timapempha ofufuza a DNV kuti akaone mayeso ofunikira. Tikhozanso kukonza kafukufuku wa ABS, BV, kapena LR ngati kasitomala akufuna.

Q: Kodi nthawi yogwiritsira ntchito chitoliro cha DNVcertified L450 ndi yotani?
A: Masiku 90-120, kuphatikizapo nthawi yofufuza ya DNV. Nthawi yopezera zinthu imadalira kupezeka kwa mbale (ma TMCP plates a m'mphepete mwa nyanja amakhala ndi nthawi yayitali yopezera zinthu, nthawi zambiri masabata 10-14). Kuyesa kwa CTOD kumawonjezera masabata 2-3. Pa maoda obwerezabwereza ndi mbale zoyenerera kale, nthawi yopezera zinthu ikhoza kuchepetsedwa kufika masiku 60-75.

Chitsimikizo cha Pulojekiti - Paipi Yotumizira Gasi Yochokera Kumadzi Akuya Kumadzulo kwa Africa (Gulf of Guinea)

Dziko:Malo otsetsereka a Nigeria / Equatorial Guinea (Gulf of Guinea)
Muyezo ndi Giredi:DNV-OS-F101 L450 SAWL (UOE) yokhala ndi chowonjezera chaubwino
Miyeso ndi Kuchuluka:

l OD 610mm (24″) × WIT 20.6mm – 52,000 metres (pafupifupi matani 13,500) yopangidwa ndi njira ya UOE

l OD 610mm (24″) × Kulemera 25.4mm – 8,000 metres (pafupifupi matani 2,500) yopangidwa ndi njira ya UOE (gawo lokwezera ndi njira yolowera m'mphepete mwa nyanja)
Zonse:Mamita 60,000 (60 km), pafupifupi matani 16,000

Mafotokozedwe:Chophimba chakunja cha 3LPE (3.2mm) chokhala ndi chophimba cholemera cha konkriti (60mm, kachulukidwe 3,050 kg/m³) kuti chikhale chopanda kuyandama. Malekezero opindika 30°/1.6mm. Hydrotest pa 25.0 MPa (kupanikizika kwa kapangidwe ka 18.0 MPa). Kuzama kwa madzi: 800-1,400m. Chofunikira Charpy pa -20°C (mphindi 50J, chafika 120-180J). CTOD pa -20°C: chitsulo chosungunula ≥ 0.25mm, HAZ ≥ 0.30mm (chafika 0.40-0.65mm). DWTT pa -20°C: malo odulira ≥ 85% (chafika 90-98%). Kuzungulira ≤ 0.2% (UOE yafika 0.08-0.15%). Kulimba ≤ 85 HRB (ntchito yowawa). HIC pa NACE TM0284: CLR 0%, CTR 0%, CSR 0%. SSC pa NACE TM0177: palibe kusweka. 100% UT ndi TOFD, kuphatikiza 25% RT. Kafukufuku wa chipani chachitatu ndi DNV GL panthawi yonse yopanga.

Ntchito:Pipe yotumizira gasi m'madzi akuya yonyamula gasi wachilengedwe kuchokera kumadera akum'mwera (kuya kwa madzi 800-1,400m) kupita ku malo osungira LNG omwe ali m'mphepete mwa nyanja. Pipe ya 60 km imaphatikizapo gawo lalikulu la madzi akuya (52 km, 20.6mm WT), gawo lokwera modabwitsa (4 km, 25.4mm WT), ndi njira yolowera m'mphepete mwa nyanja kudzera m'dera la mafunde (4 km, 25.4mm WT yokhala ndi chophimba cha konkire). Gasi ili ndi H₂S yochepa (5-10 ppm) ndi CO₂ (3-5%), zomwe zimafuna qualification ya sour service.

Mavuto ndi Mayankho a Ukadaulo:

1. Kukana kugwa kwa madzi akuya (kuya kwa madzi 1,400m)– Kupanikizika kwa hydrostatic kwakunja pa 1,400m ndi pafupifupi 14.3 MPa. Kupanikizika kofunikira kogwa ndi chitetezo ndi > 25 MPa. Womic adapanga chitoliro cha 24″ × 20.6mm UOE chokhala ndi D/t = 29.6. Pogwiritsa ntchito njira ya UOE, tidapeza ovality ya 0.08-0.12% (yochepera kwambiri malire a DNV a 0.2%). Tidachita finite element analysis (FEA) ndi kuyesa kwathunthu kogwa pa zitsanzo ziwiri. Kupsinjika kogwa komwe kudapezeka: 27.8 MPa ndi 28.5 MPa - zonse ziwiri zomwe zili pamwambapa.

2. Kulimba kwa CTOD kwa dynamic riser– Gawo lokwezera limakumana ndi kutopa chifukwa cha kuyenda kwa mitsempha yamagazi ndi mafunde. DNV imafuna kuyezetsa kwa CTOD pa -20°C. Womic adachita CTOD pa chitsulo chosungunula ndi HAZ pamapaipi a 25.4mm WT. Zotsatira: chitsulo chosungunula δ = 0.42-0.55mm, HAZ δ = 0.48-0.65mm. Tinaperekanso ma SN fatigue curves a girth weld kuti athandize kasitomala kuwunika moyo wa kutopa.

3. Utumiki wowawasa wokhala ndi H₂S yocheperako– Ngakhale kuchuluka kwa H₂S kuli kotsika (5-10 ppm), polojekitiyi idafunikira luso lonse la ntchito ya sour chifukwa cha kuthamanga kwambiri (18 MPa) komanso chiopsezo cha dzimbiri lokhazikika. Womic adagwiritsa ntchito mbale zochepa za sulfure (S ≤ 0.0010%), CEV ≤ 0.38%, Mo addition 0.20%, ndi PWHT pa 580°C kwa maola 1.5. Kulimba pambuyo pa PWHT: base metal 78-82 HRB, weld 80-85 HRB. Mayeso a HIC ndi SSC adapambana popanda ming'alu.

4. Kuphimba konkire ndi kuyanjana kwa 3LPE– Gawo loyandikira gombe linkafuna chophimba cholemera cha konkriti (60mm, cholimbikitsidwa ndi maukonde achitsulo) kuti chikhale cholimba pansi. Chophimba cholimba cha konkriti chinayikidwa pa 3LPE ndi cholumikizira. Womic idagwirizana ndi bwalo lapadera la chophimba ku Angola. Tinapereka makuponi oyesera kuti agwirizane ndi kuyesa kukhudza. Chophimba cholimba cha konkriti chinapambana mayeso ogwetsa (1m dontho, palibe kusweka).

5. Kugwirizana kwa kukhazikitsa kwa reel-lay– Paipiyi idayikidwa pogwiritsa ntchito njira yoyika ma reel (yoyikidwa pa chombo choyikira ma reel). Izi zimafuna kuwongolera kwambiri kwa dzira (≤ 0.2%) ndi kutalika kwa dzira lolimbitsa ≤ 0.5mm. Kuzungulira kwa akazi kumalamulidwa ndi dzira mpaka 0.08-0.15% ndi zipewa zoyikira pansi mpaka ≤ 0.3mm kutalika. Tinachita ma simulation 10 athunthu a dzira pa chitoliro choyesera - palibe kusweka kapena kuwonongeka kwa dzira.

6. Kafukufuku wa DNV ndi zolemba– Ofufuza a DNV adawona mayeso a hydrostatic, CTOD, HIC, SSC, ndi kuwunika kwa magawo pa gulu lililonse. Womic adapereka chikalata chapamwamba cha masamba 1,500 (kuphatikiza malipoti onse a mayeso, machati a PWHT, zolemba za UT, ndi kusaina kwa ofufuza) mkati mwa milungu 4 kuchokera pamene adatumizidwa. Chikalatacho chidalandiridwa popanda mafunso.

7. Zotsatira:Paipiyi idayikidwa bwino mu kotala lachiwiri la 2025 pogwiritsa ntchito chombo chotchedwa Deep Constructor. Palibe vuto lililonse la chitoliro kapena kusweka kwa msoko komwe kunachitika panthawi yoyika, kuyika, kapena kuyesa pambuyo poyika. Woyang'anira polojekiti ya kasitomala adati: "Kuwongolera kwa dzira la Womic ndi zotsatira za CTOD zidapitilira zomwe tinkayembekezera. Mapaipiwo adasweka nthawi zonse m'munda ndi chiwongola dzanja cha 98% chovomerezeka koyamba." Womic Steel tsopano ili pamndandanda wovomerezeka wa ogulitsa mapulojekiti awiri owonjezera otumiza gasi m'madzi akuya ku West Africa.

Lumikizanani nafe:
Webusaiti: www.womicsteel.com
Imelo: sales@womicsteel.com

Foni / WhatsApp / WeChat:
Victor: +86 15575100681
Jack: +86 18390957568

Womic Steel – Mnzanu wodalirika wa mapaipi achitsulo a DNV-OS-F101 L450 SAWL otumizira gasi m'madzi akuya, njira zoyendera madzi pansi pa nyanja, ndi makina okweza mpweya m'nyanja padziko lonse lapansi.