CS Q235 Eccentric Reducer

QS Pipe Fitting: Jiangsu CS Q235 Eccentric Reducer

CS Q235 Eccentric Reducer in 2*3/4 Inch, STD wall and butt weld ends to ASME B16.9, for flow control in petroleum and chemical piping.

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One-Minute Overview

CS Q235 eccentric reducer, 2*3/4 Inch, built to ASME B16.9.
STD wall and butt weld ends for a secure, leak-proof joint.
One flat side controls drainage or prevents gas pockets.
Corrosion resistance for petroleum and chemical plant duty.

The CS Q235 Eccentric Reducer joins two pipes of different diameters while keeping one side of the fitting flat. That flat side is the reason to choose it over a concentric reducer: on a horizontal petroleum or chemical line it lets the pipe drain fully when installed flat-side-down, or keeps a gas pocket from forming ahead of a pump suction when installed flat-side-up. This one is a 2*3/4 Inch transition in Q235 material, with standard thickness and butt weld ends, built to ASME B16.9. The corrosion resistance feature suits demanding service in oil refineries, chemical plants and other industrial facilities, and each unit is packed in a veneer case or on a pallet for safe delivery.

Name: CS Q235 Eccentric Reducer
Material: Q235
Type: Eccentric
Standard: ASME B16.9
Size: 2*3/4 Inch
Thickness: STD
End: Butt Weld
Feature: Corrosion Resistance
Usage: Petroleum Pipeline
Packing: Veneer Case or Pallet
Sizes, wall thicknesses and types are confirmed per inquiry, and a detailed specification sheet is available on request.

Orientation is the decision that matters most here. An eccentric reducer has one flat face, and which way that face points changes what the fitting does. Flat-side-down on a horizontal line gives complete drainage, which matters where product must not sit in the pipe between batches or before a shutdown. Flat-side-up keeps gas from collecting at the high point before a pump suction, which protects the pump from cavitation and the line from an air lock. Put the orientation on the spool drawing before fabrication, because once the butt weld is made the fitting cannot be rotated. Then match the Q235 material, STD wall and the 2*3/4 Inch step to the two pipes it joins, and confirm the ASME B16.9 dimensional series so both bevels meet cleanly.

Installation is a butt weld, so treat the reducer like any other welding fitting. Bevel both ends to the joint design, hold an even root gap, and align the flat side exactly where the drawing says before tacking - this is the one detail that is easy to lose in a busy shop. Weld with a procedure qualified for the material and wall, keep the bore clear of spatter, and inspect the bead and the internal transition. Because the product is described with corrosion resistance for harsh petroleum and chemical conditions, protect the surface during handling and storage and keep the veneer case or pallet intact until the fitting reaches the workface. Support the adjoining pipe so the eccentric offset is not carrying extra load, and confirm the size, thickness and orientation on the inquiry.

FAQ

Q1. Which way should the flat side face?

It depends on what you need the line to do. Flat-side-down lets a horizontal pipe drain completely, which matters when product must not sit between batches or before a shutdown. Flat-side-up prevents gas collecting at the high point before a pump suction, protecting against cavitation and air locks. Fix the orientation on the spool drawing before fabrication, because once the butt weld is made the reducer cannot be rotated to correct it.

Q2. Why pick an eccentric reducer over a concentric one here?

Because the line is horizontal and you care about what collects in it. A concentric reducer keeps the centreline straight and is fine on vertical runs or pump discharges, but on a flat run it can leave a low point that holds liquid or a high point that traps gas. The eccentric one holds a flat face, so you choose which problem to avoid. If neither matters, the concentric version is the simpler answer.

Q3. What is the classic mistake with this fitting?

Welding it in with the flat side on the wrong side, usually discovered when a pump will not prime or a line will not drain. The whole value of an eccentric reducer is that one face stays level, so check the orientation against the spool drawing before the first tack, keep the root gap even, and do not let a busy shop turn the fitting to ease fit-up. Once welded, the only fix is a cut and a new reducer.

Q4. What payment terms do you accept?

T/T, L/C at sight and other internationally accepted terms. The exact terms are agreed with you before production starts, because the payment schedule has to match the order value, the shipping method and the delivery schedule you need — which is also why we confirm them up front rather than after shipment.

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