It is very important to carefully choose forged and butt-weld fittings for industrial piping systems, as they need to be really high quality to handle the immense pressure, corrosive media and layout requirements. The oil & gas, chemical, marine and desalination industry commonly use Flange F55, Types Of Tee, 316 Stainless Steel 120 Degree Joint, Socket Weld Olet and China Stainless Steel Tee. Understanding their features, standards and custom options helps procurement engineers and contractors choose the right fittings, and avoid costly installation failure.
ASTM F55 Flange Specifications
The ASTM F55 specification is for duplex stainless steel that is commonly referred to as F55 flange or super duplex flange – UNS S32760. F55 flange has an unusual combination of extraordinary resistance to chloride corrosion and high mechanical strength. It is suitable for “seawater, brine and sour service environment.” While high temperature and cyclic pressure perform as well as other stainless steel flanges, typical stainless steel flanges do not typically meet the PREN requirements of the F55 flange. Using standard or reduced standard materials and fittings can result in reduced fatigue performance, while the ability to cast both weld neck and slip on, blind and socket weld according to ASME B16.5.
Professional Types Of Tee
Types Of Tee: the most common are equal tee, reducing tee, lateral tee and special angle tee. For flow diversion, the mainstream is the standard 90-degree tee, and the 316 Stainless Steel 120 Degree Joint is a special custom tee for non-standard pipeline layout. Corrosion resistant to pitting, 316 stainless steel with molybdenum content works ideal for chemical, pharmaceutical, drinking water, wastewater pipelines. China’s stainless steel tee is also a popular choice among many global buyers due to its highly stable quality, competitive lead time. Our China Stainless Steel Tee are composed of butt weld, forged socket and threaded tees as per ASME B16.9 and ASME B16.11SCHED.
Socket Weld Olet (Sockolet)
This reinforced branch outlet fitted is known as Socket Weld Olet or sockolet, and is manufactured to MSS SP-97. It uses a socket weld connection for small-labeled branch take-off (less complicated than butt weld olet for on-site assembly). Socket Weld Olet evenly distributes stress from the run pipe and replaces traditional tee branches in piping with limited space. It is available in parallel to our Flange F55 and stainless steel tee series, in grades of stainless steel, duplex, super duplex, carbon steel for one-stop package supply.
Customisation Parameters Table
| Product Range | Flange F55, Types Of Tee, 316 Stainless Steel 120 Degree Joint, Socket Weld Olet, China Stainless Steel Tee |
|---|---|
| Applicable Standards | ASME B16.5, ASME B16.9, ASME B16.11, MSS SP-97, ASTM A182, ASTM A403 |
| Material | UNS S32760 F55, SS316, SS316L, SS304, Duplex 2205, Alloy steel |
| Size Range | NPS 1/2” – NPS 24”, DN15 – DN600, special large sizes upon request |
| Schedule / Wall Thickness | SCH5S, SCH10S, SCH40, SCH80, SCH160, STD, XS, XXS |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500#, 3000#, 6000# |
| Angle Option | 90°, 45°, 120°, custom special angles |
| Surface Treatment | Pickled & passivated, black coating, anti-rust oil, galvanized |
| Inspection | PMI, UT, MT, PT, hydrostatic test, third-party certification |
| Document | MTC, dimension drawing, heat treatment report, packing list |
Buyers need to clarify some key technical details prior to placing purchase order. Check about the type of flange, pressure class and facing in case of Flange F55. For 316 St Stainless Steel 120 Degree Joint special angle fittings, specify run size, branch size, wall thickness, and if possible provide drawing. For Socket Weld Olet, mention schedule of run pipe and branch size, pressure rating. All types of tee can be identified – equal tee, reducing tee, or special lateral tee. China Stainless Steel Tee factory accepts OEM and ODM orders, including non-standard angle and special groove customization.
Quality control is essential for pressure-containing fittings. Every lot of Flange F55, Socket Weld Olet and China Stainless Steel Tee has traceable heat numbers. We offer options like Path of test certificates for export in both full and small trial orders for bulk projects.
For the complex needs of super duplex flanges, branch outlets and custom stainless steel tees, send us your specifications or drawings to request quotes. We can combine Flange F55, Socket Weld Olet and 316 Stainless Steel 120 Degree Joint with the standard Types Of Tee for the entire piping package.
Post time: Nov-13-2026
