The boiler inspection article provides you with information about inspection of boilers and boiler testing in manufacturing shop, as well as boiler in-service inspection in operating units. You may review water tube boiler and fire tube boiler inspection procedures.
There are two types of steam boilers. One is the fire tube, which is made from one combustion chamber and many tubes.
The hot gases that are produced during the combustion process pass from inside the tubes and make a heat transfer with the water that is on the outside of the tubes.
The other type is a water tube steam boiler. It is just the opposite of the fire tube steam boiler; the water is in the inside of the tubes and the hot gases are on the outside of the tubes.
In the fire tube boiler, we have a limitation on the combustion chamber diameter and length, and it cannot exceed a certain value. So for large-scale industry, generally the water tube boilers are used.
The construction code for a water tube boiler is ASME Code Section I, and it covers the minimum requirements for design, materials, fabrication, inspection, testing, and preparation for initial delivery.
So this is when you require that your water tube boiler meet ASME Code requirements, or when you need your water tube boiler to be “S” stamped.
For more detail about stamped boiler and requirements, review the Pressure Vessel Certification article. The regulation is similar to the one for the boiler.
With the above explanation, your inspection and test plan (ITP) for the water tube boiler needs to meet the requirements of ASME Code Section I.
The water tube boiler is made from several components such as the HP Drum, finned Tubes, Headers, Tube Bundle, Stack, Damper, Silencer, Deaerator, etc.
For more detailed information about water tube boiler shop inspection, review the following articles:
Third Party Inspection for Water Tube Boiler
Inspection and Test Plan for Water Tube Boiler
The construction code for the fire tube boiler is ASME Code Section I, and it covers the minimum requirements for design, materials, fabrication, inspection, testing, and preparation for initial delivery.
For more detailed information about fire tube boiler shop inspection, review the following articles:
Third Party Inspection for Fire Tube Boiler
Inspection and Test Plan for Fire Tube Boiler
The In-Service Inspection code for your water tube boiler is ASME Section VII.
The inspection regulation is different from one location to another location by regulated jurisdiction.
In some states, the inspection by an authorized inspector of the insurance company is mandatory.
Generally, the states that have mandated “S” stamp for manufactured boilers, have also mandated in-service inspection by authorized inspection agencies.
The API also has a recommendation practice, API RP 573, for the inspection of fired boilers and heaters. Most of these practices and recommendations are similar to the ASME Code Section VII Recommended Guidelines for Care of Power Boilers.
During inspection and probable repair, other codes and recommendation practices might be used. Some of these are API RP 577, API RP 571 and ASME Code Section IX.
Please note that your water tube boiler is “S” stamped and you need to do repair, you have to use a Repair Organization holding an “R” Stamp from the National Board Inspection Code.
Water Tube boiler inspections are categorized as follows:
Inspection of Internal Sections
Inspection of Tubes
Inspection of Burners
Inspection of Soot Blowers
Inspection of Boiler External Parts
Inspection of Stack
Inspection of Steam Drum
Inspection of Silencer
Pressure Vessel Inspection, Heat Exchanger Inspection, Above Ground Storage Tank Inspection, Piping Inspection, Valve Inspection, Heater Inspections
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