Rigidly inspected carbon steel, stainless steel, and alloy plain flanges engineered to withstand tropical humidity and aggressive industrial fluids in Bangladesh project sites.
An in-depth whitepaper overview of how pipeline components drive Bangladesh’s multi-billion dollar mega projects and industrialization.
As one of Asia's fastest-growing economies, Bangladesh is undergoing massive structural modernizations. The rapid development of key economic zones such as the Bangabandhu Sheikh Mujib Shilpa Nagar (BSMSN) in Mirsarai, expanding power facilities in Payra and Matarbari, and modern water treatment infrastructure managed by WASA across Dhaka, Chattogram, and Rajshahi have multiplied the national demand for reliable piping connection components.
Plain flanges (commonly referenced as flat flanges, plate flanges, or EN 1092-1 Type 01 / ASME B16.5 Slip-on Plate Flanges) represent a fundamental hardware component within these systems. Their straightforward planar geometry, ease of alignment during field welding, and superior cost-efficiency make them indispensable for low-to-medium pressure utility pipelines, cooling water circuits, chemical effluent processing, and civil utility grids across South Asia.
1. Ready-Made Garments (RMG) & Textile Processing: Modern textile washing, dyeing, and Effluent Treatment Plants (ETP) require extensive stainless steel (SS304/SS316L) plain flanges to handle corrosive wastewater and steam distribution.
2. Marine & Ship Repair: Chattogram’s ship recycling and ship-building yards demand heavy-duty carbon steel plain flanges (ASTM A105 / Q235B) treated with high-grade anti-corrosive galvanization to combat high marine salinity.
3. Oil, Gas & LNG Terminals: Regasification units near Moheshkhali rely on certified EN 10204 3.1 pressure-tested plain plate flanges for utility gas loops and auxiliary drainage systems.
Technical parameters detailing chemical composition, dimensional tolerances, and sealing capabilities required for optimal performance in tropical operating conditions.
Plain flanges are primarily defined by their flat disc design without a raised hub. They slide over the end of the pipe and are welded in place via two fillet welds (one internal and one external). Selecting the right material grade and standard compliance is crucial to preventing crevice corrosion and stress cracking under high thermal cycles.
| Standard Specification | Pressure Rating | Size Availability | Common Material Grades | Sealing Face Types |
|---|---|---|---|---|
| ASME B16.5 / B16.47 | Class 150, Class 300, Class 600 | 1/2" to 48" (DN15 - DN1200) | ASTM A105, A350 LF2, A182 F304/304L, F316/316L | Flat Face (FF), Raised Face (RF) |
| EN 1092-1 Type 01 | PN6, PN10, PN16, PN25, PN40 | DN10 to DN2000 | P245GH, P250GH, S235JR, 1.4301, 1.4404 | Type A (Flat), Type B1 (Raised Face) |
| DIN Standards (2573/2576) | PN6, PN10 | DN15 to DN1000 | RSt37-2, C22.8, SS304, SS316 | Form A, Form B |
| JIS B2220 | 5K, 10K, 16K | 10A to 1000A | SS400, SF440A, SUS304, SUS316 | Flat Face, Raised Face |
Given Bangladesh's monsoon climate and coastal humidity, un-coated carbon steel flanges oxidize rapidly. YUXIN provides yellow lacquer, black rust-proof oil, transparent anti-rust varnish, and heavy-duty Hot-Dip Galvanizing (HDG) per ASTM A123 standards to ensure a 25-year maintenance-free lifespan.
All sealing faces are turned on high-precision CNC vertical lathes to achieve exact surface roughness (125–250 AARH or Ra 3.2–6.3 µm concentric/phonographic grooves). This ensures leak-proof mating with spiral wound or EPDM gaskets in water supply grids.
Every single plain flange forged in our Shanxi plant is stamped with heat number, size, wall thickness, and pressure rating. Mill Test Certificates per EN 10204 3.1 accompany every export container shipped to Chittagong or Mongla ports.
Optimizing supply chains, navigating Letter of Credit (L/C) compliance, and accelerating freight turnaround times from factory floors to project destinations.
Procurement managers in Bangladesh often face strict banking regulations regarding Letter of Credit (L/C) opening, pre-shipment inspections (PSI), and strict documentation compliance matching Bangladesh Customs requirements.
Leveraging our location in Dingxiang, Shanxi—China’s premier forging hub—we operate direct rail and ocean freight routes targeting South Asian maritime hubs.
How next-generation forging technology and green metallurgical standards are reshaping industrial piping systems in developing markets.
Moving away from simple cut-plate low-tier flanges, YUXIN utilizes closed-die forging and continuous ring rolling. This refines internal grain flow along the flange circumference, boosting yield strength and dynamic impact resistance—crucial for high-vibration pump stations in Bangladesh WASA installations.
To satisfy international EPC requirements (such as Japanese, Korean, and European consortiums operating in Bangladesh), 100% of our high-pressure plain flanges undergo Ultrasonic Testing (UT) per ASTM A388 and Magnetic Particle Inspection (MPI) to guarantee zero internal voids or inclusions.
Aligned with global decarbonization goals, our manufacturing process utilizes electric induction reheating and energy-efficient CNC machining setups. This reduces the carbon footprint per ton of flange produced, aiding green building certifications (LEED) for Bangladeshi RMG factories.
Explore our full engineering line including custom ring flanges, tube sheets, blind flanges, stub ends, and expansion joint flanges available for import to Bangladesh.
Why top Bangladeshi importers and engineering contractors select YUXIN as their audited flange manufacturing partner.
Our production quality system is audited per ISO 9001:2015 by TÜV CERT, alongside Pressure Equipment Directive (PED 2014/68/EU) and AD 2000-Merkblatt W0 approvals, meeting all mandatory tender technical criteria in Bangladesh.
Our bilingual engineering sales desk provides rapid quote turnarounds within 24 hours, detailed CAD drawing verification, and instant MTC copy verification for engineers reviewing bids in Dhaka or Chattogram.
Beyond standard ASME or EN sizes, our forging shop develops customized plain flanges, reducer plates, and tube sheets up to 3,000 mm diameter based directly on client CAD files and service pressure drawings.
Expert technical answers addressing selection, welding, pressure ratings, and customs logistics for Plain Flanges.
A Plain Flange (often referred to as a Flat Plate Flange or EN 1092-1 Type 01) is produced from a flat annular plate without a extended raised hub. A standard Slip-On Flange (ASME B16.5) typically features a subtle hub that aids in stress distribution around the neck. Plain flanges are lighter, more economical, and ideal for low-to-medium pressure applications such as water distribution, HVAC, and light effluent lines.
For municipal water distribution and industrial Effluent Treatment Plants (ETP) in Bangladesh, PN10 and PN16 (per EN 1092-1) or Class 150 (per ASME B16.5) are the standard choices. They provide an optimal balance between pressure retention (up to 16 bar) and material cost efficiency.
We apply several anti-corrosion treatments depending on project specs: high-grade hot-dip galvanizing (HDG) per ASTM A123, heavy black rust-proof coating, or yellow varnish. Hot-dip galvanizing is strongly recommended for coastal installations around Chattogram, Cox's Bazar, and Mongla to resist marine salt spray oxidation.
Yes. Every batch of plain flanges is shipped with an original EN 10204 3.1 Mill Test Certificate detailing chemical analysis (C, Mn, Si, P, S, Cr, Ni content), mechanical yield/tensile strength, hardness, and heat treatment log. We routinely host third-party inspection agencies such as SGS, Bureau Veritas, and Intertek for L/C compliance verification before container sealing.
For standard sized plain flanges held in stock or standard forged blanks, production machining takes 7 to 15 days. Ocean freight shipping from Qingdao or Tianjin ports to Chattogram (Chittagong) Port usually takes between 14 to 20 transit days, resulting in a total lead time of approximately 3 to 5 weeks from purchase order confirmation.
Contact our expert forging engineering team today for instant technical consultations, CAD drawings, and competitive direct-factory price quotes for plain flanges.
