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Tube Sheet
This UNS N08926 (904L) stainless steel tubesheet flange is a precision-machined pressure vessel component, produced with CNC and laser drilling processes for heat exchangers, evaporators and reactor equipment. The product serves industrial clients in petrochemical, pharmaceutical, power generation and marine engineering sectors, with compliance to multiple international flange and pressure vessel standards.
The tubesheet flange is manufactured in compliance with ASME BPVC, as well as ANSI B16.5, EN 1092, JIS B2220-2012 and GOST 12820-80 standards. The production facility holds ISO 9001, ISO 14001, ISO 45001, CE and TS certifications, with production processes following standardized quality management systems. This multi-standard compliance supports the product’s application in engineering projects under different regulatory systems.
UNS N08926 (alloy 904L) is a high-alloy austenitic stainless steel with high chromium and nickel content, as well as molybdenum and copper alloying elements. This material provides good resistance to sulfuric acid, phosphoric acid and chloride-induced corrosion, making it suitable for acidic and high-corrosion process environments. It maintains stable mechanical properties within a wide temperature range, meeting the requirements of most chemical and pharmaceutical process equipment.
Besides 904L, a range of alternative material grades are available for custom orders, including austenitic stainless steel, duplex stainless steel, carbon steel, nickel alloy and Cr-Mo alloy grades, to adapt to different pressure, temperature and corrosion working conditions.
LANGE TYPE | PLATE FLANGE、WELDED NECK FLANGE、BLIND FLANGE、THREADERD FLANGE、 SLIDE FLANGE、SOCKET WELDING FLANGE、DISINFECTION POTT FLANGE、FLE XIBLE JOINT FLANGE、TUBE SHEET、 LARGE DIAMETER FLANGE、PRIESS FLANG E、 PRESSURE VESSEL FLANGE、LAP FLANGE、BUTTERFLYVALVE FLANGE. |
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IPE FITTING IMENSIONS | MAXIMUM OUTER DIAMETER: 6000 |
RESURE | 150 #-2500 #, PN0.6-PN400, 5k-40k |
EALING SURFACE | RF,FF,RTJ,GROOVE,CUSTOMIZABLE |
PECIFICATION | GOST 12820-80 / ANSI B16.5 / EN1092 / BS4504 / JIS B2220-2012 / DIDN/ AMSE B16.5 / UNI-MULTIPLE STANDARDS COMPLIANCE! |
ALL THICKNESS ATERIAL URFACE TREATMENT | SCH5S、SCH10S、SCH10、SCH40S、SCH20、SCH30、SCH40、SCH60、 SCH80、SCH160 |
STAINLESS STEEL: A182F304/304L、A182 F316/316L、A182F321、A182F310S、 A182F347H、A182F316T1、317/317L、904L、1.4301、1.4307, 1.4401、1.44571、 1.4541、254MO。 CARBON STEEL: A105、A350LF2、S235JR、S275JR、ST37、ST45.8、A42CP、 A48CP、E24、A515 GR60、A515 GR70。 | |
DUPLEX STAINLESS STEEL:UNS31803、SAF2205、UNS32205、UNS31500、UN S32750、UNS32760、1.4462、1.4410、1.4501。 LINE PIPE STEEL: A694 F42、A694F52、A694 F60、A694 F65、A694F70、A694F80。 | |
NICKEL ALLOY: INCONEL600、 INCONEL625、 INCONEL690、INCOLOY800O、INCO LOY825、INCOLOY800H、C22、C-276、MONEL400、ALLOY200。 CR-MO ALLOY: A182F11、A182F5、A182F22、A182F91、A182F9、16MO3、15CR MO。 | |
WIDELY USED IN THE PETROCHEMICAL INDUSTRY, PHARMACEUTICAL INDUSTRY, WASTE GAS SYSTEM, POWER PLANTS, SHIPBUILDING, WATER TREATMENT, AND SO ON. | |
For tubesheet processing, CNC and laser drilling processes are available, with the following technical scope:
Maximum processing diameter: 6000 mm
Drilling tolerance: ±0.1 mm for hole diameter, ±0.15 mm for hole position
Available hole types: Straight hole, stepped hole, chamfered hole
Surface roughness of hole wall: Ra ≤ 3.2 μm
Nom. Pipe Size | O | T | R | x | No./Dia. of Holes | Bolt Circle Dia | L2 | H | B2 | L | B | L3 | B3 | D | c | Thr | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1/2 | 3.75 | 0.56 | 1.38 | 1.5. | 4-0.62 | 2.62 | 2.06 | 0.84 | 0.62 | 0.88 | 0.88 | 0.12 | 0.88 | 0.90 | 0.38 | 0.93 | 0.62 |
3/4 | 4.62 | 0.62 | 1.69 | 1.88 | 4-0.75 | 3.25 | 2.25 | 1.05 | 0.82 | 1.00 | 1.09 | 0.12 | 1.00 | 1.11 | 0.44 | 1.14 | 0.62 |
1 | 4.88 | 0.69 | 2.00 | 2.12 | 4-0.75 | 3.50 | 2.44 | 1.32 | 1.05 | 1.06 | 1.36 | 0.12 | 1.06 | 1.38 | 0.50 | 1.41 | 0.69 |
1-1/4 | 5.25 | 0.75 | 2.50 | 2.50 | 4-0.75 | 3.88 | 2.56 | 1.66 | 1.38 | 1.06 | 1.70 | 0.19 | 1.06 | 1.72 | 0.56 | 1.75 | 0.81 |
1-1/2 | 6.12 | 0.81 | 2.88 | 2.75 | 4-0.88 | 4.50 | 2.69 | 1.90 | 1.61 | 1.19 | 1.95 | 0.25 | 1.19 | 1.97 | 0.62 | 1.99 | 0.88 |
2 | 6.50 | 0.88 | 3.62 | 3.31 | 8-0.75 | 5.00 | 2.75 | 2.38 | 2.07 | 1.31 | 2.44 | 0.31 | 1.31 | 2.46 | 0.69 | 2.50 | 1.12 |
2-1/2 | 7.50 | 1.00 | 4.12 | 3.94 | 8-0.88 | 5.88 | 3.00 | 2.88 | 2.47 | 1.50 | 2.94 | 0.31 | 1.50 | 2.97 | 0.75 | 3.00 | 1.25 |
3 | 8.25 | 1.12 | 5.00 | 4.62 | 8-0.88 | 6.62 | 3.12 | 3.50 | 3.07 | 1.69 | 3.57 | 0.38 | 1.69 | 3.60 | 0.81 | 3.63 | 1.25 |
3-1/2 | 9.00 | 1.19 | 5.50 | 5.25 | 8-0.88 | 7.25 | 3.19 | 4.00 | 3.55 | 1.75 | 4.07 | 0.38 | 1.75 | 4.10 | / | 4.13 | 1.44 |
4 | 10.00 | 1.25 | 6.19 | 5.75 | 8-0.88 | 7.88 | 3.38 | 4.50 | 4.03 | 1.88 | 4.57 | 0.44 | 1.88 | 4.60 | / | 4.63 | 1.44 |
5 | 11.00 | 1.38 | 7.31 | 7.00 | 8-0.88 | 9.25 | 3.88 | 5.56 | 5.05 | 2.00 | 5.66 | 0.44 | 2.00 | 5.69 | I | 5.69 | 1.69 |
6 | 12.50 | 1.44 | 8.50 | 8.12 | 12-0.88 | 10.62 | 3.88 | 6.63 | 6.07 | 2.06 | 6.72 | 0.50 | 2.06 | 6.75 | I | 6.75 | 1.81 |
8 | 15.00 | 1.62 | 10.62 | 10.25 | 12-1.00 | 13.00 | 4.38 | 8.63 | 7.98 | 2.44 | 8.72 | 0.50 | 2.44 | 8.75 | } | 8.75 | 2.00 |
10 | 17.50 | 1.88 | 12.75 | 12.62 | 16-1.12 | 15.25 | 4.62 | 10.75 | 10.02 | 2.62 | 10.88 | 0.50 | 3.75 | 10.92 | I | 10.88 | 2.19 |
12 | 20.50 | 2.00 | 15.00 | 14.75 | 16-1 25 | 17.75 | 5.12 | 12.75 | 12.00 | 2.88 | 12.88 | 0.50 | 4.00 | 12.92 | / | 12.94 | 2.38 |
14 | 23.00 | 2.12 | 16.25 | 16.75 | 20-1.25 | 20.25 | 5.62 | 14.00 | 13.25 | 3.00 | 14.14 | 0.50 | 4.38 | 14.18 | I | 14.19 | 2.50 |
16 | 25.50 | 2.25 | 18.50 | 19.00 | 20-1.38 | 22.50 | 5.75 | 16.00 | 15.25 | 3.25 | 16.16 | 0.50 | 4.75 | 16.19 | / | 16.19 | 2.69 |
18 | 28.00 | 2.38 | 21.00 | 21.00 | 24-1.38 | 24.75 | 6.25 | 18.00 | 17.25 | 3.50 | 18.18 | 0.50 | 5.12 | 18.20 | } | 18.19 | 2.75 |
20 | 30.50 | 2.50 | 23.00 | 23.12 | 24-1.38 | 27.00 | 6.38 | 20.00 | 19.25 | 3.75 | 20.20 | 0.50 | 5.50 | 20.25 | I | 20.19 | 2.88 |
22 | 33.00 | 2.63 | 25.25 | 25.25 | 24-1.63 | 29.25 | 6.50 | 22.00 | 21.25 | 4.00 | 22.22 | 0.50 | 5.75 | 22.25 | I | 22.19 | 3.13 |
24 | 36.00 | 2.75 | 27.25 | 27.62 | 24-1.62 | 32.00 | 6.62 | 24.00 | 23.25 | 4.19 | 24.25 | 0.50 | 6.00 | 24.25 | / | 24.19 | 3.25 |
This 904L tubesheet flange is widely used in petrochemical processing, pharmaceutical manufacturing, waste gas treatment systems, power plants, shipbuilding and water treatment industries. It serves as a core component of shell-and-tube heat exchangers, condensers, evaporators and pressure vessels, supporting the stable operation of process equipment.
The 904L material tubesheet flange adapts to acidic process environments, chloride-containing water systems and medium-to-high temperature process conditions. For special working conditions such as high pressure and strong corrosion, alternative alloy materials can be selected to match the actual operating parameters.
The tubesheet flange is produced through forging, heat treatment, CNC machining and laser drilling processes. The CNC and laser drilling equipment ensures accurate hole position and consistent hole wall quality, reducing assembly deviation between tube sheets and heat exchanger tubes. The production process supports custom drilling layouts based on client-provided drawings.
All tubesheet flanges undergo dimensional verification, hole position accuracy detection, surface quality inspection and material composition analysis before delivery. Non-destructive testing items such as ultrasonic testing can be added according to client requirements, with corresponding test documents provided.
The maximum outer diameter for tubesheet flange production reaches 6000 mm, covering DN150 to DN3000 nominal sizes. Custom diameters beyond this range can be evaluated based on specific requirements.
Under standard CNC and laser drilling processes, the hole diameter tolerance reaches ±0.1 mm, and the hole position tolerance reaches ±0.15 mm. Tighter tolerance requirements can be discussed for specific projects.
Yes, custom drilling configurations are supported. Clients may provide design drawings with hole layout, diameter and tolerance requirements, and the technical team will review the drawings and confirm production feasibility.
For commercial procurement needs including bulk orders and custom specifications, clients may submit drawings and parameter requirements for detailed quotation and technical confirmation.
