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stress damage tube boilers

Product Thermal Capacity: 1 - 20 t/h

Working Pressure: 0.7 - 2 Mpa

Available Fuel: Nature gas, coke oven gas, biogas, methanol, liquid propane gas, diesel, heavy oil, light oil, crude oil, etc.

Available Industries: Heat supplying, chemical, food, textile, printing and dyeing, cigarettes and tobacco, fodder, pharmacy, building materials, brewery, rubber, hospital etc.

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Introduction of WNS gas / oil fired steam boiler:

WNS series horizontal internal combustion boiler is a boiler shell type 3 passes wetback oil/gas fired boiler. After fuel is being atomized by burner, flame is full of the wave furnace and transfer heat via furnace wall, this is 1st pass; the high temperature smoke is collected in reversal chamber and then enters 2nd pass which is grooved tubes bundle area; after heat convection, air temperature gradually falls and goes to front smoke box and turn to 3rd pass, which is smooth tubes bundle area, and then enters chimney passing back smoke box and exhausted to the atmosphere.

Technical advantages:

1. Digitized manufacture
The key part such as material cutting, rolling, drilling are proceeded by advanced CNC machining process to reduce the assemble stress and extend boiler working lifetime.
The front and back smoke chamber plates are cut by CNC plasma cutting machine and looks tidy and beautiful.

2.Easy operation and maintenance
Fully automatically operating, with automatically adjustment and protection of burning, water level, temperature and steam pressure.

3. Longer working life
Smoke tube and tube sheet connection is expanded first to eliminate the gap between them, then adopt automatic argon arc welding to relief the stress and expand boilers working life.
Longitudinal and girth joint adopt advanced automatic submerged-arc welding for good welding quality. All longitudinal and girth joint will have 100% radiographic inspection.
Fin tube us ND steel or stainless-steel material which avoid low temperature corrosion.
Inspection procedure point is set up to guarantee the sequence of expanding and welding, avoid cracking of the tube sheet holes.

4. Less fuel consumption
High quality aluminum silicate fiber is used with fire clay insulation, to control the boiler body temperature below 45℃ to control heat lost.
Sufficient steam storage room and heating area makes boiler to generate high quality steam and high thermal power.
Condenser is added to reuse the waste heat of the exhausted smoke to increase feeding water’s temperature and reduce emission temperature, which can increase the thermal efficiency above 98% and save operating cost.

Water Tube Boilers | Spirax Sar

Water-tube boilers differ from shell type boilers in that the water is circulated inside the tubes, with the heat source surrounding them. Referring back to the equation for hoop stress (Equation 3.2.1), it is easy to see that because the tube diameter is significantly smaller, much higher pressures can …

A Review of the Common Causes of Boiler Failure in t

reverse fillet welds of the main tube to shell and furnace tube to tube sheet are the most common places of attack in fire tube boilers and the problem is often described as toe cracking. Failure is initiated at the surface in a high stress area.

Stress-Assisted Corrosion in Boiler Tubes (Technic

Stress assisted corrosion (SAC) of carbon steel boiler tubes is one of the major causes of waterside failure in industrial boilers. SAC is a major concern for kraft recovery boilers in the pulp and paper industry as any water leak into the furnace can cause a smelt-water explosion in the boiler.

Steam Boiler Inspections Using Remote Field Testi

Forced outages of steam boilers due to tube leakages remain the leading cause of lost production in plants. Due to hundreds, if not thousands of linear feet of pipe, there is a high potential for

Stress Assisted Corrosion & Fitness for Service in 66 Ye

BP's Whiting Refinery has five 400,000 lbs/hour steam generating boilers built in 1948 that supply the refinery's steam needs as well as 75% of its electrical demand. During recent internal inspections on these boilers, unique damage mechanisms were observed, such as stress assisted corrosion and dissolved oxygen pitting.

Boiler Tube Failures - YouTube

Click to v

Click to view1:57May 10, 2009· Part 2 •Flow Accelerated Corrosion (FAC). •Stress Corrosion Cracking (SCC) •Hydrogen Damage •Sulphur corrosion •Graphitization •Thermal Fatigue •Waterside Corrosion Fatigue •Soot

The National Board of Boiler and Pressure Vessel Inspecto

Consequently, the bottom of the drum will become longer than the top, causing the drum to warp. This phenomenon called "drum humping" can lead to stress fractures of the generating tubes between the steam and mud drums. Refractory damage is the most prevalent damage associated with a quick warm-up of a boiler from a cold start.

Boiler Corrosion - Thermodyne Boile

What is Boiler Corrosion? “Boiler Corrosion is slow poison for Industrial Boilers. Talk to Experts and save your boilers life: Thermodyne Team”. Corrosion is a phenomenon in which atmospheric oxygen in the air or water reacts with the metal to form “oxides.Corrosion in industrial boilers is a phenomenon in which the oxygen that is dissolved in the water inside the boiler reacts with the

The National Board of Boiler and Pressure Vessel Inspecto

Common Causes of Tube Damage. Impact the tube with a sharp object - The tube material is fairly soft and even a cold chisel dropped from a few feet away can result in a gouge and a localized thin spot on the tube. Any added stress can cause the unit to fail when it is pressurized and can also serve as a point of concentrated corrosion.

Corrosion Fatigue in Boiler Tubes – Thielsch Engineeri

Oct 28, 2018· Corrosion fatigue is relatively common in boilers subject to cycling service, and even more common in boilers subject to peaking service. When steam explosions do occur, the resultant damage is heavily dependent upon the quality and quantity of high-pressure steam or water released.

Cause of Boiler Tube Failures - Chicago Tube & Ir

Cited by: 1 CAUSES OF TUBING FAILURES The purpose of the following information is to focus attention on these facts: The environmental conditions within the boiler can be highly aggressive and alter the microstructure of tubing. Stresses caused by external loads, or induced by cold forming operations, uneven cooling or welding, may substantially lower the resistance of tubing […]

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No. 76, Xin Da Road, Zhou tie Town, Yixing, Wuxi, China

0086-510-68530066, +86-13506151292

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