ANSI B16.5 Flanges to Thailand

Oil & Gas Industry

Upstream Production Applications:

• Wellhead connections using Class 600#-2500# flanges with RTJ facing per API 6A specifications
• Production manifolds handling multiphase flow (oil, gas, water) at pressures 800-1500 psig
• Gas-oil separators where Class 300#-600# flanges connect vessels and piping systems
• Chemical injection systems using Class 150#-300# stainless steel socket weld flanges for corrosion inhibitor and methanol injection
• Produced water handling systems with duplex F51 flanges resisting chloride corrosion

Thailand’s onshore gas fields in the Chumphon Basin and condensate processing facilities specify ANSI B16.5 carbon steel flanges for moderate pressure applications, transitioning to alloy steel F22 and duplex F51 for high-pressure gas compression and high-chloride formation water handling. Werner Flanges supplies complete flange packages for Thai upstream operations including matching pairs for critical leak-free service, RTJ ring gaskets, and specialized bolting materials rated for sour service conditions.

Midstream Pipeline & Transportation:

• Gas transmission pipelines (28″-48″ diameter) using large Class 150#-300# weld neck flanges at valve stations, pig launchers, and meter stations
• Condensate pipelines with Class 300# carbon steel or F11 alloy steel flanges for corrosive hydrocarbon liquid service
• Pipeline block valves where flanged connections allow valve removal for maintenance without cutting piping
• Meter runs and custody transfer measurement stations using orifice flanges with pressure tap connections
• Pipeline crossings and shore approaches using Class 300#-600# flanges with enhanced corrosion protection

PTT’s extensive natural gas pipeline network transporting gas from the Gulf of Thailand to processing plants in Rayong and distribution points throughout Thailand relies on ANSI B16.5 flanges for critical connection points. These applications demand long-term reliability with 30-40 year design life, driving specification of premium quality flanges with enhanced impact testing, supplementary hardness requirements, and strict dimensional tolerances.

Downstream Refining Operations: Thailand’s refineries including Thai Oil (Sriracha, 275,000 bpd capacity), IRPC (Rayong, 215,000 bpd), Bangchak (Bangkok, 120,000 bpd), and Star Petroleum (Rayong, 155,000 bpd) utilize tens of thousands of ANSI B16.5 flanges throughout their processing units:

• Crude distillation units: Class 150#-300# A105 and F11 flanges for atmospheric and vacuum towers operating 200-400°C
• Hydrotreating units: Class 300#-600# F11 and F22 alloy steel flanges for high-pressure hydrogen service (800-1200 psig, 350-400°C) per API RP 941
• Catalytic reforming: Class 300# F22 flanges for high-temperature reformer effluent (480-520°C) with NACE compliance for hydrogen sulfide
• Fluid catalytic cracking: Class 150#-300# A105 and 321 stainless steel flanges for reactor feed, regenerator systems, and hot flue gas piping
• Alkylation units: Class 150#-300# F316L stainless steel flanges for corrosive sulfuric or hydrofluoric acid service
• Utilities and offsites: Class 150# A105 flanges for cooling water, steam systems, flare networks, and product pipelines

Werner Flanges maintains extensive experience supplying Thai refineries during turnarounds and expansion projects, providing expedited delivery of critical flanges to minimize downtime. Our material selection guidance helps Thai refinery engineers choose optimal flange grades for each service, balancing corrosion resistance, temperature capability, and cost-effectiveness.

Power Generation

• Thailand’s installed electrical generation capacity exceeding 45,000 MW includes coal-fired thermal plants, natural gas combined-cycle facilities, and growing renewable energy sources, all utilizing ANSI B16.5 flanges in steam systems, cooling circuits, and auxiliary systems. The Electricity Generating Authority of Thailand (EGAT) and independent power producers operate major facilities where flange reliability directly impacts plant availability and safety, making quality and proper material selection critical.Coal-Fired Thermal Power Plants:
  • Main steam systems (162-240 bar, 540-565°C) using Class 600#-900# F22 or F91 alloy steel weld neck flanges with RTJ facing
  • Hot reheat piping (40-60 bar, 540-565°C) with Class 300#-600# F22 flanges designed for high-temperature creep resistance
  • Cold reheat and feedwater systems using Class 300# A105 or F11 flanges for moderate pressure/temperature service
  • Condensate and boiler feed pump discharge (60-100 bar, 160-200°C) with Class 600# A105 flanges
  • Flue gas desulfurization (FGD) systems using Class 150# F316L or duplex F51 flanges for corrosive acidic flue gas
  • Ash handling systems with Class 150# A105 flanges for pneumatic or sluice transport

  EGAT’s Mae Moh coal-fired complex (2,625 MW) and independent plants like B.Grimm Power’s Saraburi facility use thousands of high-temperature alloy steel flanges specified to ASME B31.1 Power Piping Code. Werner Flanges supplies complete flange packages including matching bolting materials (A193 B16, A194 7) rated for elevated temperature service and creep conditions.

  Natural Gas Combined-Cycle Plants:

  • Gas turbine fuel gas systems using Class 300#-600# A105 flanges for high-pressure natural gas (20-60 bar)
  • Heat recovery steam generators (HRSG) with Class 150#-600# A105 and F11 flanges connecting HP, IP, LP steam drums
  • Steam turbine connections using Class 600# F22 flanges for high-pressure superheated steam
  • Cooling water systems (seawater or freshwater) with Class 150# A105 or F316L flanges depending on water chemistry
  • Condensate polishing and demineralized water systems using Class 150# F304L stainless steel flanges

  Thailand’s newest high-efficiency combined-cycle plants achieving 60%+ thermal efficiency operate with advanced steam conditions (120+ bar, 565°C+) requiring F91 advanced alloy steel flanges with proven high-temperature strength. Werner Flanges provides long-term creep-rupture data and stress-to-rupture curves supporting flange selection for these demanding applications.

  Renewable Energy & Cogeneration:

  • Biomass boilers using Class 150#-300# A105 flanges for steam generation from agricultural waste
  • Biogas plants with Class 150# A105 and F316L flanges handling corrosive biogas and digestate
  • Geothermal systems (if developed) requiring Class 150#-300# duplex or super duplex flanges for corrosive geothermal brine
  • Industrial cogeneration plants using standard Class 150#-600# flanges sized per process steam requirements

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Petrochemical Processing 

• Thailand’s position as Southeast Asia’s petrochemical hub, with the massive Map Ta Phut Industrial Estate housing complexes operated by PTT Global Chemical (PTTGC), Thai Polyethylene (TPE), Thai ABS, and other producers, creates substantial demand for ANSI B16.5 flanges in specialized chemical processing services. These world-scale facilities producing ethylene, propylene, polyethylene, polypropylene, aromatics, and specialty chemicals operate at conditions ranging from cryogenic ethylene storage (-104°C) to high-temperature thermal crackers (850°C+), requiring diverse flange materials and pressure classes.Ethylene Production & Olefins:
  • Steam cracker furnaces using Class 300# F321 or F22 flanges for high-temperature hydrocarbon feed (600-750°C)
  • Quench systems with Class 150#-300# A105 and 304 stainless steel flanges for rapid cooling of cracked gas
  • Compression systems using Class 300#-600# A105 and F11 flanges for multi-stage cracked gas compression (cold side) and hot recycle gas (warm side)
  • Cryogenic separation columns with Class 150#-300# A350 LF2 flanges for ethylene fractionation at -104°C
  • Refrigeration systems using F316L stainless steel flanges for propylene and ethylene refrigerant circuits

  PTTGC’s Olefins-1 and Olefins-2 complexes at Map Ta Phut collectively produce 1.5+ million tons/year of ethylene using hundreds of thousands of specialized flanges. Werner Flanges supports these operations with material expertise in cryogenic service (impact testing to -101°C), high-temperature alloys (creep testing verification), and NACE-compliant materials for sulfur-bearing feeds.

  Aromatics & Polymers:

  • Reformate processing and aromatics extraction using Class 150#-300# A105 and F304L flanges for benzene, toluene, xylene separation
  • Transalkylation and isomerization reactors with Class 300#-600# alloy steel flanges for high-pressure catalytic processes
  • Polyethylene reactors using Class 600#-900# A105 flanges for high-pressure polymerization (1000-1500 psig, 150-250°C)
  • Polypropylene reactors with Class 150#-300# A105 and 316L flanges for slurry or gas-phase polymerization
  • Catalyst feed systems using small-bore socket weld and threaded stainless steel flanges for precise chemical injection

  Specialty Chemicals & Fine Chemicals: Thailand’s growing specialty chemical sector producing surfactants, additives, agrochemicals, and performance chemicals requires corrosion-resistant ANSI B16.5 flanges:

  • Chlor-alkali plants using Class 150# F316L, duplex F51, or titanium flanges for concentrated caustic soda and chlorine service
  • Sulfuric acid concentration units with Class 150# F316L or F51 duplex flanges resisting hot concentrated acid
  • Solvent recovery systems using Class 150#-300# stainless steel flanges for alcohol, ketone, and ester handling
  • Batch reactors in pharmaceutical and agrochemical production with sanitary 316L flanges for cleanable, non-contaminating piping

  Werner Flanges provides comprehensive material selection consulting for Thailand’s chemical plants, evaluating corrosion mechanisms (oxidizing vs. reducing, pH, temperature, chloride content) to recommend optimal flange materials ensuring long service life while controlling costs.

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Water & Wastewater Treatment

• Thailand’s expanding urban population and industrial development drive increasing investment in water treatment, wastewater processing, and desalination infrastructure throughout Bangkok, Chonburi, Rayong, and other major cities. These facilities utilize ANSI B16.5 flanges extensively in raw water intake, treatment chemical dosing, filtration systems, membrane processes, and treated water distribution. While generally lower pressure applications (Class 150# predominant), the combination of corrosive water chemistry, biological fouling potential, and 24/7 continuous operation demands reliable flanges with appropriate corrosion resistance.Municipal Water Treatment:
  • Raw water intake pumping stations using Class 150# A105 or ductile iron flanges for large diameter piping (24″-48″)
  • Coagulation and flocculation systems with Class 150# A105 or F304L flanges for chemical injection (aluminum sulfate, ferric chloride)
  • Filtration and backwash systems using Class 150# F304L stainless steel flanges for chlorinated water resistance
  • Disinfection systems (chlorine, ozone, UV) with Class 150# F316L or PVC-lined flanges for oxidizing chemical resistance
  • High-service pumping and distribution with Class 150# A105 flanges for treated water delivery

  Bangkok’s Metropolitan Waterworks Authority (MWA) and Provincial Waterworks Authority (PWA) facilities treating Chao Phraya River water specify corrosion-resistant flanges for chemical feed systems and chlorinated water service. Werner Flanges supplies F304L and F316L stainless steel flanges with smooth raised face finish and sanitary gasket compatibility for potable water applications meeting Thai drinking water quality standards.

  Industrial Wastewater Treatment:

  • Screening and grit removal systems using Class 150# A105 or ductile iron flanges for raw wastewater
  • Biological treatment (activated sludge, sequencing batch reactors) with Class 150# F304L flanges for aeration systems
  • Chemical treatment (neutralization, precipitation) using Class 150# F316L or PTFE-lined flanges for acidic/alkaline waste
  • Sludge dewatering and handling with Class 150# A105 or F304L flanges for slurry service
  • Tertiary treatment and membrane bioreactors (MBR) using Class 150# F316L flanges for high-purity permeate water

  Map Ta Phut Industrial Estate’s centralized wastewater treatment facility handling petrochemical effluents uses ANSI B16.5 flanges throughout, with material selection based on specific contaminants and pH levels. Werner Flanges provides corrosion resistance data and chemical compatibility charts helping Thai environmental engineers select appropriate flange materials for each service.

  Desalination Plants (Future Development): While Thailand currently relies primarily on surface water and groundwater, potential future desalination development in water-stressed regions would require specialized flanges:

  • Seawater intake and pretreatment using duplex F51 flanges for corrosion resistance (10,000+ ppm chlorides)
  • Reverse osmosis high-pressure feed (60-80 bar) with Class 600# duplex F51 or super duplex F53 flanges
  • Post-treatment and remineralization using F316L stainless steel flanges for product water
  • Brine disposal systems with super duplex F53 or F55 flanges for concentrated seawater (70,000+ ppm chlorides)

  Werner Flanges maintains extensive experience supplying Middle Eastern desalination plants and can support future Thai seawater desalination projects with appropriate materials and testing for extreme chloride corrosion resistance.

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