Pressure Vessels

Each pressure vessel that we manufacture is per the American Society of Mechanical Engineers (ASME) code. As a leading ASME pressure vessels manufacturer, our specialty lies in working with a variety of alloys, pressures, & designs to meet your custom requirements. More »

Weld Overlay and Clad Vessels

Our weld overlay and clad vessels are fully code-compliant. We use our advanced welding techniques to their full capabilities to offer you the finest overlay/clad components and pressure vessels. More »

High Pressure Vessels

We hold the American Society of Mechanical Engineers (ASME) U, U2, and U3 stamps, and have the capabilities and resources to manufacture ASME high pressure vessel to your exacting specifications. More »

Autoclaves

We hold the American Society of Mechanical Engineers (ASME) U, U2, U3, PP, & S stamps, and have the capabilities and resources to manufacture autoclaves to your exacting specifications. More »

Heat Exchangers

We specialize in the design, engineering, and fabrication of Shell and Tube Heat Exchangers, including thermal calculations. All of our units are built in strict accordance with the latest edition and addenda of the A.S.M.E. Code, Section VIII Division 1, 2, or 3 and T.E.M.A.” More »

 

The Two Methods of Cladding Stainless Steel to Vessels

Pressure vessels, designed to handle gases and liquids under pressure, usually operate in strenuous environments. Most of the time, they are exposed to dust, mist, gases, harsh liquids, solvents, and several other chemicals. Long years of service in such corrosion prone industrial environments result in tarnishing or corroding the crucial components of pressure vessels. Rusting of pressure vessel components leads to catastrophic incidents that may claim the lives of workers and cause damage to property. Hence, protecting vessels from corrosion is of great significance.

How Pressure Vessels can be Provided with Comprehensive Corrosion Protection?

Several methods are in use to prevent the rusting of pressure vessel parts. Of these, stainless steel strip cladding is the most popular. Cladding stainless steel is a cost-effective and easiest way of depositing a fine layer of corrosion resistant protective layer on the substrate. Stainless steel strip cladding provides exceptional resistance to corrosion, wear and tear, abrasion, and oxidation. Besides these advantages, stainless steel clad vessels feature high strength and smooth surface finish.

Understanding the Two Stainless Steel Strip Cladding Methods

The two most common types of stainless steel strip cladding are Submerged Arc Welding (SAW) and Electro slag Welding (ESW). SAW is the most commonly used type. However, ESW is recommended for applications requiring superior level corrosion protection and abrasion resistance. Let us understand these two methods in brief.

  • SAW Strip Cladding to Vessels: This method is suitable for surfacing larger areas of pressure vessels. In this method of stainless steel cladding, a strip electrode is used to produce an electric arc between the substrate material and the electrode. This electric arc is not uniform, but constantly move back and forth at high speed. The flux thus produced, melts the strip and the slag formed protects the weld pool from the atmosphere. The effectiveness of this method can be enhanced by using larger electrode strips and high intensity welding currents.
    This method features:

    1. High deposition rates
    2. Easy slag removal
    3. Superior quality weld metal
    4. Suitable for surfacing flat or curved base materials
  • ESW Strip Cladding:The method is ideal for welding vessels with heavy wall thickness. ESW is different in terms of SAW strip cladding in a way that, there is no electric arc generated between strip electrode and the base material. However, the method uses ohmic heating to melt the strip electrode to liquid slag. The slag generates heat, which melts the surface of the base material.
    ESW method features:

    1. Lower penetration and dilution
    2. High current density, resulting in higher deposition rates
    3. Increased welding speed, hence cover large areas in less time
    4. Low flux consumption
    5. Lower arc voltage

Both SAW and ESW cladding methods offer several kinds of overlaying possibilities in varied thickness using different stainless steel alloy combinations.

Stainless steel clad vessels provide impeccable operational excellence even with long years of service in corrosion prone industrial environments.

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