Carbon Steel 10 Weld Neck Flange

QS Flange: CS 10 WN Flange

CS 10 carbon steel weld neck flange, 1-1/4 inch 150LB, STD thickness, raised face to ANSI B16.5, easy and quick to install.

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One-Minute Overview

Weld neck flange in CS 10 steel, 1-1/4 inch, for a 150LB joint.
Butt welds to the pipe and presents a raised face to ANSI B16.5.
Supplied in STD thickness, as the specification lists.
One weld per flange, then bolt up to the mating flange.

The CS 10 WN flange is a weld neck: the pipe is butt welded into the back of the hub, and the flange then bolts to its partner. The joint is made in two steps and taken apart in one. The body is CS 10 carbon steel, the face is raised, the thickness is STD, and the dimensions follow ANSI B16.5 for a 1-1/4 inch 150LB connection. Weld neck flanges are chosen where a joint has to stay sound through thermal cycles, because the hub carries the change from pipe to flange over a gradual section rather than at a corner.

Name: CS 10 WN Flange
Size: 1-1/4 Inch
Pressure: 150LB
Material: CS 10
Thickness: STD
Type of Face: Raised Face
Standard: ANSI B16.5
Feature: Easy and Quick Installation

A 1-1/4 inch weld neck sits on the small utility lines that feed instruments, drains, vents and small pumps, and on the tappings where a reading has to be taken without shutting the header. The welding end is prepared for a butt weld to the pipe, the hub backs the weld up, and the raised face gives the gasket a defined seating band. Installation is quick because there is only one weld per flange: fit up, tack, complete the joint, then bolt the two flanges together with the gasket between them.

Alignment matters more than speed. Check that the flange face is square to the pipe before the root pass goes in, and leave the bolts slack until the weld has cooled, so the joint does not pull the flange out of square while it shrinks. The 150LB class covers the low pressure side of plant piping in water conservancy, power station and general industrial service, where the same flange pattern turns up on pipe racks, skids and packaged equipment.

FAQ

Q1. What is the difference between a WN flange and a blind?

A weld neck has a bore and a hub at the back for the pipe to butt into, so it becomes part of the line and carries flow. A blind has no bore at all and closes the line. On a 1-1/4 inch joint the two are often bolted face to face, which is why both turn up in the same piping package.

Q2. Why does a weld neck need a hub at all?

The hub gives the weld a thicker section to fuse into and takes the change from pipe wall to flange thickness over a gradual length instead of a step. That is why the type is preferred where a joint sees thermal cycling or repeated loading: the stress path is smoother, and there is no sharp corner for a crack to start from.

Q3. What does STD mean on the thickness line?

STD is a wall thickness schedule, the same one used for pipe, so it tells you which wall the flange is built to match rather than a measurement in millimeters. This flange is listed at STD. Check it against the wall of the pipe you are welding to; if the two differ, the weld preparation needs attention before anyone strikes an arc.

Q4. How long will production take?

Standard sizes are typically ready within 30 days, and in-stock items ship immediately. Larger or custom orders get a confirmed date per order, because the schedule depends on quantity, material, the bolt pattern you specify, and how busy production is at the moment you order.

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