Olet Fittings
Product Description
1. Product Introduction
An Olet — short for outlet — is a specialized branch outlet fitting engineered to address the fundamental mechanical challenge of branching: cutting a hole in a pressure-containing header pipe creates a stress concentration that reduces the pipe's pressure capacity precisely at the branch intersection. The Olet solves this by being forged as a single piece with a pre-formed reinforcing saddle pad around the branch outlet. This integral reinforcement provides the same additional pressure-containing area that would otherwise require a separate fabricated reinforcement pad welded onto the header — but without the on-site welding, fit-up, and inspection complexity. The Weldolet is the most widely used type: it has a butt-weld end that connects to the branch pipe, and the forged saddle is fillet-welded to the outside of the header pipe. The Threadolet uses NPT or BSP threaded connections for the branch, eliminating branch-side welding entirely — ideal for instrumentation, sampling, or lower-pressure branches. The Sockolet offers a socket-weld branch connection for applications that need more strength than threads but less than a full butt-weld. All three types comply with MSS SP-97, the authoritative design and dimensional standard for integrally reinforced forged branch outlets.
2. Product Features
- Three connection types: Weldolet (butt-weld), Threadolet (NPT/BSP threaded), Sockolet (socket-weld)
- Branch sizes from 1/8 inch up to 24 inches NPS; header sizes from 1/2 inch to 60 inches NPS
- Integral forged reinforcing saddle pad eliminates the need for separate on-site weld-on reinforcement
- Wall thickness ratings: STD, XS, SCH160, and XXS matching all standard pipe schedules
- Pressure ratings: #3000 and #6000 for high-pressure service
- Materials: carbon steel, alloy steel, and stainless steel for all process conditions
- Compliant with MSS SP-97 — the recognized standard for integrally reinforced branch outlets
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