Dai ni na aten na pipeline engineering a ahkyak ai lam langai hku nna, n-gun rawng ai n-gang pipe ni hpe katsi ai, katsi ai, sau htu ai, hte kaga ginra ni hta grai lang ma ai. Shanhte a gawgap ai atsam gaw, system a insulation a akyu, ngang grin ai lam, shim lum ai lam ni hpe hkrak hkra machyi shangun ai. Insulated steel pipe gawgap ai lam gaw tara ni hpe hkan sa na matu, seng ang ai hpaji masa ni hpe ngang ngang kang kang hkan sa na matu ahkyak ai, arung arai lata ai lam, gawgap ai lam hpe hkyen lajang ai lam, jung ai lam ni kaw na atsawm sha hkang lu na matu ra kadawn nga ai.
I. Arung arai hte hkap la ai lam
Insulated steel pipe ni a matu madung arung arai ni gaw, n-gang pipe, n-gun n-gun n-gun ( polyurethane foam, lung seng n-gang zawn re ai), shinggan na n-gup n-gu (law tsaw-density polyethylene (sh) galvanized iron zawn re ai) ni lawm ai. Gawgap n galaw shi yang, arung arai yawng gaw, "GB/T 29047{{3}2012 High{4}density polyethylene shinggan n-gun, polyurethane plastic hpe tau hkrau hkyen lajang da ai, n-gun rawng ai pipe" shing nrai, "GB/T 17393-2008 Technical Specification Specification hpe Covered galaw na matu, mungdan madang ni hpe hkan sa ra ai. Direct-Buried Insulated Pipeline."
Steel Pipe: GB/T 8163{2}2018 Fluid Transportation (sh) GB/T 3091-2015 Seamless Steel Pipe hpe hkan sa ra ai, n-gun n law ai n-gun n-gun n-gun n-gun n-gun n-gun n-gun n-rawng ai ni hpe n-gun jaw ai lam ni a matu n-gun n-gun n-rawng ai ni hpe n-gun jaw ai.
Insulation: Polyurethane foam gaw 0.024 W/(m·K) hta grau nna n-gun n-gun n-nga ai thermal conductivity nga ra ai, 60 kg/m3 hta grau kaba ai (sh) dai hte maren sha rai ra ai, 0.3 MPa hta grau nna Greater a n-gun n-gun hpe n-gun jaw ai n-gun atsam nga ra ai.
Shinggan na Pipe: High{0}density polyethylene (HDPE) hpe 20 MPa hta grau nna Greater n-gun hte n-gun n-gun hte n-gun n-gun hte n-gun n-gun n-gun n-gun n-gun n-gun hte n-gun shayawm ai lam hpe ninghkap lu na matu 350% hta grau nna 350% hta grau nna n-gun yawm mat ai.
Material ni hpe du wa ai shaloi, hkan sa ai lam hte chyam dinglik ai lam hpe ka da ai laika hpe jaw ra ai, myi hte mu lu ai hku jep joi ai lam galaw ra ai. Hten za ai lam, n kaja ai lam, shing nrai kaga n kaja ai lam ni hpe n mai lang ai.
II. Gawgap lajang ai lam
Site Survey: Gawgap n galaw shi yang, pipeline lam, lup makoi ai sung ai lam, ga nhpu ni hpe sawk sagawn ra ai, dai hku nna, hkrang shapraw ra ai lam ni hpe hkan sa na matu. Trench htu shaw ai lam: Direct-}t ai n-gun rawng ai n-gang pipe ni a matu hka htung gaw "GB 50268-2008 Hka hpe gram lajang na matu hte hka ja ai lam hpe hkap la na matu masat da ai lam" hpe hkan sa ra ai. Dai hka htung npu gaw n-gun n rawng ai hte n-gun ja ai lung seng ni n lawm ai sha rai ra ai. Ra ai rai yang, n-gun ja ai sand cushion layer (N-gup hta grau kaba ai (sh) maren sha re) hpe tawn da ra ai.
Pipeline Prefabrication: Insulated steel pipe ni hpe, n-gun n rawng ai (sh) n-gun n rawng ai, n-gun rawng ai n-gun hte n-gun n rawng ai hka htung lapran hta ngang kang ai hku n-gun ja hkra galaw na matu, jak rung kata (sh)-site hta shawng nnan tawn da ra ai.
III. Installation galaw ai ladat ni
Pipeline Welding: Argon arc welding (sh) wan jak arc welding hpe lang ra ai. Welds ni gaw 100% myi hte mu lu ai hku jep joi ai lam galaw ra ai rai nna, n-gun n rawng ai chyam dinglik ai lam ni hpe galaw ra ai (X{3}ray (sh) ultrasonic chyam dinglik ai lam zawn re ai ni) hpe hkan sa na matu "GB/T 12467-2018 Radiography of Fusion Weldeded Joints of Metallic Materials" ngu ai masat masa hpe hkan sa na matu.
Insulation Layer Installation: Polyurethane foam insulation layer hpe n-gun n rawng ai sha, n-gun n rawng ai sha, n-gun n rawng ai sha, n-gun n rawng hkra galaw ra ai. Shinggan na casing hte insulation layer hpe hka n shang hkra ngang ngang jum da ra ai. Interface Treatment: Pipe matut mahkai ai lam ni hta insulation layer (flanges hte welded joints zawn re ai) matut manoi galaw ra ai. Joints ni hpe thermal bridging hpe pat shingdang na matu, laksan n-gun rawng ai sealing arung arai ni ( polyurethane adhesive (sh) rubber-plastic tape zawn re ai ni hte pat da ra ai.
Backfill ra kadawn ai lam ni: Direct-}} ai pipeline ni hpe backfilling galaw ai shaloi, n-gun ja ai arung arai ni hte pipe lapran na hkrak matut mahkai ai lam n byin na matu, pipe ntsa kaw na 500 mm lapran hta hka n-gun rawng ai nhprang (sh) n-gun n rawng ai ga hpe lang ra ai. Backfill ga gaw 95% hta grau nna (sh) maren sha n-gun rawng ai layer de layer langai hpang langai hpe n-gun jaw ra ai.
IV. Quality hpe chye na ai madang ni
Hkrang shapraw ai lam hpe jep sagawn ai lam: Insulation layer gaw n-gun n rawng ai, hkra machyi ai (sh) n-gun n rawng ai, shinggan na casing hpe n-gun n rawng ai (sh) n-gun n rawng ai hku galaw ra ai.
Thermal Insulation Performance Testing: thermal imaging camera (sh) thermal conductivity tester hpe lang nna, insulation a bungli galaw ai lam hpe jep joi nna, design ra ai lam ni hpe hkan sa lu na matu galaw ra ai.
Pressure Test: N bang da ngut ai hpang, pipeline hpe 1.5 lang hydraulic pressure test galaw ra ai. Minit 30 daram n-gun rawng ai n-gun hpe hkam la lu ai ngu sawn la ai. Corrosion Testing: Dai n-gang pipe hpe anti-}corrosion coating (3PE (sh) epoxy powder zawn re ai) hte ka-up da ai rai yang, hka lim ai lam n nga ai hpe kam na matu, spark leak detector hpe lang ra ai.
V. Hkamja lam hte grup yin ra kadawn ai lam ni
Gawgap ai lam hpe makawp maga ai lam: Hkamja lam hpe makawp maga na matu, wan hkru ai lam hte wan hkru ai lam hpe makawp maga na matu, wan hkru ai lam ni hpe galaw ra ai.
Hkringmang daju a shingra tara ra kadawn ai lam ni: Polyurethane foam arung arai ni hpe atsawm sha shinggyin tawn da ra ai, n-gun n rawng ai arung arai ni a majaw grup yin hpe awu asin byin shangun ai hpe pat shingdang ra ai, n kaja ai arung arai ni hpe garan ginhka nna garan nna kabai kau ra ai.
Daw dan lam
Insulated steel pipe ni a matu gawgap ai madang ni gaw, arung arai, ladat, hkap la ai lam ni hpe jep joi ai lam ni lawm ai lam law law lawm ai. Ndai lam ni hpe mungdan hte hpaga lam hte seng ai tara ni hpe ngang ngang kang kang hkan sa ra ai, dai hku nna peping system a galu kaba ai- hpe ngang grin ai hku galaw lu na matu re. N tara ai hku gawgap ai majaw, n-gun n rawng ai (sh) pipe hkra machyi ai hpe pat shingdang na matu, gap ai shaloi, n-gun ja ai hku jep joi ai lam galaw ra ai, dai hku nna bungli masing a hkam kaja lam hte magam bungli prat hpe hkam la lu na re.
