Industrial piping systems lean on dependable, precision-machined parts to withstand all of the pressure, temperature fluctuations, and the extremely frequent disassembly of these systems with the push of a few quick hand approaches. Pipe, Olet, Stub End Flange, Lap Joint Flange and Weldolet are the best known fittings in the oil & gas, chemical processing, power generation and Marine pipeline sectors. Knowledge of their usage, selection criteria and bespoke parameters aids engineers and purchasers in using the appropriate parts and preventing costly installation errors.
A standard pipe consists of the primary flow conduit, while joints are made for flow diversion, equipment connection and maintenance through branch outlets and flange connections. The Olet family is made up of forging all integral reinforced branch outlet fittings. Olet Weldolet, the top choice for butt-weld in the existing Vars Olet family, has its specific standard made to MSS SP-97, and is contoured to the outer surface of the run pipe, thus distributing stress around the branch cut. This space-efficient and low-welding Savvy Weldolet is the preferred choice for critical piping at very high pressures and temperatures, unlike regular tees.
When it comes to flange joints that need easy bolt-hole alignment, the combination of Stub End Flange and Lap Joint Flange is the most popular design. It is quite common for the assembly to be popularly called the Stub End Flange, even though it is really not. The stub end is simply a short butt‐weld fitment, bolted to end of pipe while the lap joint flange is an open backing ring with the flat surface even with the edge of the stub end. The Lap Joint Flange can be rotated freely to line up bolt-neck holes before tightening the bolts, which streamlines bolt-positioning on site. It also allows the less expensive carbon steel to be used on the Lap Joint Flange while the corrosion-resistant stainless steel or alloy (which is expensive in such applications) to be constrained to the stub end, therefore reducing material cost without sacrificing sealing performance. This type of fitting is common for stainless steel, duplex and nickel alloy piping where inspection by frequent disassembly is necessary.
Custom Manufacturing Parameters
All more fittings within this series support manufacture services for made to measurement (Custom). Below is our standard custom parameters table for quick inquiry:
| Category | Specifications |
|---|---|
| Product Range | Pipe, Olet, Weldolet, Stub End, Lap Joint Flange |
| Applicable Standards | ASME B16.5, ASME B16.9, MSS SP-43, MSS SP-97, ASTM A105, A182, A234 |
| Material | Carbon steel, SS304, SS316L, Duplex, Alloy 20, Hastelloy, Inconel |
| Size Range | NPS 1/2” – NPS 24” (DN15 – DN600), larger sizes available upon request |
| Schedule / Wall Thickness | SCH5S, SCH10S, SCH40, SCH80, SCH160, STD, XS, XXS |
| Pressure Class | 150#, 300#, 600#, 900#, 1500#, 2500# |
| Surface Treatment | Black paint, hot-dip galvanized, pickled & passivated, anti-rust oil |
| Inspection | PMI, UT, MT, PT, RT, hydrostatic test, third-party certification |
| Document | MTC, dimension drawing, heat treatment report, packing list |
Ordering Information
When placing an order, you need to be clear what you need on each part. Specify the run pipe size, run schedule, branch size and branch schedule for Weldolet and Olet. Identify whether you need short pattern or long pattern stub end, flange class and facing type for Stub End and Lap Joint Flange sets. The pipe schedule should be identical from stub end to Weldolet branch end to ensure a clean butt weld for full penetration.
Because these components have to contain pressure, they are always quality controlled. The pipe, Olet, Stub End Flange, Lap Joint Flange and Weldolet have been forged or are built under traceable heat numbers. We do OEM & ODM orders, including non-standard dimensions, special groove designs and custom marking. Small trial orders (and bulk project orders) are both acceptable.
Ready to Enhance Your System Safety?
Whether you are planning a new piping layout or simply replacing components, giving importance to 1 set of Stub End and Lap Joint Flange with the Weldolet and Olet branch outlets will definitely enhance system safety. Contact us today letting us know about your drawings or specifications sheet in for accurate quotation.
Post time: Nov-13-2026
