Weld Neck Flanges Supplier to Turkey

Oil & Gas Industry

• BOTAŞ Natural Gas Transmission NetworkTurkey’s 15,000+ km natural gas pipeline network, operated by BOTAŞ (Boru Hatları ile Petrol Taşıma A.Ş.), represents one of the largest weld neck flange applications in the country. The transmission system operates at pressures of 60-80 bar, requiring Class 600# carbon steel (A105) weld neck flanges throughout mainline piping, compressor station connections, and city gate metering facilities.The Trans-Anatolian Natural Gas Pipeline (TANAP), transporting Azerbaijani natural gas from the Georgian border through Central Anatolia to the European border near Edirne, utilizes thousands of 36″, 42″, and 48″ Class 600# weld neck flanges at block valve stations, pig launcher/receivers, and compressor units. The project specified A105 material with 100% ultrasonic testing and magnetic particle inspection to ensure zero-defect performance in this critical energy infrastructure linking Europe to Caspian gas resources.City gate stations across Turkey’s 81 provinces employ Class 300# and 600# weld neck flanges in sizes from 8″ to 24″ for pressure reduction, metering, and odorization equipment. Istanbul’s multiple city gate stations, serving 16 million people, require corrosion-resistant coatings on carbon steel flanges to withstand marine atmosphere corrosion in this coastal megacity.

  TÜPRAŞ Petroleum Refineries

  Turkey’s state oil company TÜPRAŞ operates four major refineries with combined capacity of 28.1 million tons/year crude oil processing:

  • İzmit Refinery (Kocaeli): 11.0 million tons/year
  • İzmir Refinery (Aliağa): 11.1 million tons/year
  • Kırıkkale Refinery: 5.0 million tons/year
  • Batman Refinery: 1.1 million tons/year

  These facilities consume tens of thousands of weld neck flanges annually for new construction, maintenance turnarounds, and capacity expansion projects. Material selection spans carbon steel A105 for crude oil atmospheric distillation, A350 LF2 for LPG refrigeration systems, F316L stainless steel for sour water strippers, F11/F22 alloy steel for hydrotreating reactors, and F321 for delayed coking units.

  The İzmit refinery’s 2024 modernization project, upgrading diesel hydrotreating capacity to meet Euro 6 emissions standards, specified F11 alloy steel weld neck flanges for reactor effluent piping operating at 380°C and 180 bar hydrogen partial pressure. The tapered hub design of weld neck flanges proved essential for fatigue resistance in this severe cyclic service.

  Turkish Petroleum Corporation (TPAO) Operations

  TPAO’s domestic oil production facilities in Batman, Adıyaman, and Diyarbakır provinces utilize weld neck flanges in gathering systems, separation facilities, and crude oil storage terminals. The company’s recent Black Sea natural gas discovery (Sakarya Field with 540 billion m³ reserves) will require thousands of subsea and platform weld neck flanges in duplex and super duplex stainless steels to resist seawater corrosion at depths exceeding 2,000 meters.

  Offshore platform topsides processing equipment operates in Turkish maritime climate conditions, requiring F51 duplex weld neck flanges for seawater-wetted service and F53 super duplex for produced water disposal systems handling high chloride, high H₂S conditions. The subsea Christmas trees and manifolds will employ F55 super duplex Class 1500# weld neck flanges rated for deepwater pressure and extreme corrosion resistance.

Petrochemical & Chemical Processing

• PETKİM Petrochemical ComplexPETKİM operates Turkey’s largest integrated petrochemical facility in Aliağa (İzmir), producing ethylene, propylene, polyethylene, polypropylene, PVC, and various chemicals. The facility’s ethylene cracker, processing 1.3 million tons/year naphtha feedstock, employs high-temperature F321 stainless steel weld neck flanges for pyrolysis furnace transfer line exchangers operating at 850°C.The polyethylene production units utilize:
  • High-pressure autoclave reactors (1500-3000 bar): Class 1500-2500# weld neck flanges in special nickel alloy materials
  • Low-pressure gas phase reactors (20-30 bar): Class 300# A105 carbon steel weld neck flanges
  • Ethylene refrigeration systems (-100°C): A350 LF2 low-temperature carbon steel weld neck flanges

  PETKİM’s chlor-alkali facility, producing caustic soda and chlorine for Turkish industry, specifies F316L stainless steel weld neck flanges for brine service, chlorine gas piping, and caustic distribution. The material’s resistance to pitting corrosion in chloride environments ensures 15-20 year service life without leakage.

  Turkish Chemical Industry Facilities

  Turkey’s diversified chemical sector includes facilities producing fertilizers, industrial chemicals, plastics, and specialty chemicals across the Marmara, Aegean, and Mediterranean regions.

  Phosphoric acid production plants in Mersin and İskenderun employ F316L stainless steel weld neck flanges for acid reactor and concentration systems. The combination of phosphoric acid, sulfuric acid, and fluoride compounds at 80-100°C requires superior corrosion resistance beyond carbon steel or F304 stainless steel capabilities.

  Turkish TDI (toluene diisocyanate) and MDI (methylene diphenyl diisocyanate) plants for polyurethane production utilize F321 stainless steel weld neck flanges for phosgene service at 200-250°C. The stabilized microstructure prevents sensitization and maintains corrosion resistance in this highly toxic, corrosive chemical environment.

Power Generation

• Coal-Fired Thermal Power PlantsTurkey’s coal-fired power sector, transitioning toward high-efficiency supercritical parameters, extensively employs weld neck flanges in steam generation and distribution systems. Major facilities include:EMBA Afşin-Elbistan Complex (Kahramanmaraş): Turkey’s largest power plant complex with installed capacity exceeding 4,000 MW. The supercritical units operate at 250 bar, 580°C main steam conditions, requiring F22 Class 900# weld neck flanges for superheater outlet headers and Class 1500# F91 flanges for highest pressure sections.Çatalağzı Thermal Plant (Zonguldak): 300 MW units near Turkey’s coal mining region employ Class 600# F22 weld neck flanges for main steam piping (160 bar, 540°C) and Class 300# A105 flanges for condensate and feedwater systems.

  Çan Thermal Plant (Çanakkale): Lignite-fired facility using locally mined coal specifies F22 alloy steel weld neck flanges for superheater and reheater connections to withstand high-sulfur coal combustion products and steam-side oxidation at 520-560°C.

  Steam turbine inlet flanges require precise alignment and dimensional accuracy to prevent vibration and bearing loads. The tapered hub design of weld neck flanges facilitates accurate pipe alignment while providing robust structural connection resisting thermal expansion stresses during start-up and shutdown cycles.

  Natural Gas Combined Cycle Plants

  Turkey’s rapid expansion of combined cycle gas turbine (CCGT) power generation has created strong demand for weld neck flanges in heat recovery steam generator (HRSG) systems. Modern CCGT facilities achieve 60%+ electrical efficiency through three-pressure level HRSGs generating high-pressure (HP), intermediate-pressure (IP), and low-pressure (LP) steam.

  İsken Sugözü Plant (Adana): 1,320 MW CCGT facility employs F22 Class 600# weld neck flanges for HP steam system (100 bar, 540°C) and Class 300# A105 flanges for IP and LP systems. The facility’s rapid start-up capability (20 minutes from cold start to full load) demands flange joints capable of severe thermal shock without leakage.

  Hamitabat Natural Gas Plant (Kırklareli): Combined cycle units near the European border utilize F11 alloy steel weld neck flanges for HRSG superheater and evaporator connections operating at 450-500°C. The material’s creep strength maintains joint integrity over 200,000+ operating hours.

Water & Wastewater Treatment

• Istanbul Water & Sewerage Administration (İSKİ)İSKİ operates the water supply and wastewater collection systems for Istanbul’s 16 million population, managing massive infrastructure including:Melen Water Supply Project: Delivering 1.2 billion m³/year from Melen River (180 km east of Istanbul) through large-diameter transmission mains. The project employs 48″, 60″, and 72″ ductile iron pipe with Class 150# flat face weld neck flanges for connections to valves, flow meters, and pump stations. The flat face design prevents stress concentration on brittle ductile iron fittings.Wastewater Treatment Plants: Istanbul’s Ataköy, Baltalimanı, Kadıköy-Moda, and Tuzla treatment facilities process 3+ million m³/day wastewater using Class 150# F316L stainless steel weld neck flanges for activated sludge aeration systems, biogas collection piping, and chemical dosing equipment. The stainless steel material resists hydrogen sulfide corrosion common in municipal wastewater environments.

  Desalination Facilities (Southern Turkey)

  Water-stressed provinces along Turkey’s Mediterranean and Aegean coasts increasingly deploy seawater desalination plants. Antalya’s reverse osmosis desalination facility (75,000 m³/day capacity) employs:

  • F316L Class 150# weld neck flanges for seawater intake piping (ambient seawater service)
  • F51 duplex Class 600# flanges for high-pressure RO feed pumps (60-80 bar pressure)
  • F53 super duplex flanges for concentrated brine discharge (extreme chloride concentration)

  The superior pitting resistance of duplex materials ensures 25-year design life in continuous seawater service at 15-25°C.