Monthly Archives for April 2018

Inspection of Spheres

In general, the practices that apply to pressure vessels also apply to spheres although the techniques may vary. The tall legs necessary to support spheres should be carefully inspected to determine the condition of the fireproofing and the rain seals. … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: | Leave a comment

Reactors External Inspection

1. Nozzles Visually inspect gasket faces if opened, ORJ gaskets and bolting material. On vessels with pressure sealed gaskets check for distortion, corrosion, and cleanliness. 2. Shell a. Obtain UT thickness measurements at representative locations on shell and heads. b. … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: , | Leave a comment

Reactors Internal Inspection

1. Inspection Ports Obtain measurements at corrosion reference points on reactor shell. Inspect for corrosion or scale at these locations. Loose scale on the bottom head is probably a combination of scale and catalyst. This scale can cause corrosion and … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: , , , , | Leave a comment

Pressure Vessels Inspection

1. External Corrosion Horizontal drums resting on concrete support saddles frequently corrode externally in the area of the saddle. Inspect the water seal at the edge of the concrete If evidence of corrosion exists, it might be advisable to lift … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: , | Leave a comment

Distillation Columns Internal Inspection

1. Safety Entry of a column can be made only after the approved, signed entry tags are in place on the column. Safety rules in effect at the vessel must be observed. Inspectors must not work alone in vessels but … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: , , , , | Leave a comment

Distillation Columns External Inspection Prior to Entry

1. Support and Foundations Distillation columns are usually supported by a cylindrical skirt which usually s fireproofed inside and outside with concrete, brick, or other insulating material. Inspect the fireproofing material carefully for evidence of cracking, spalling, or defective seal … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: , | Leave a comment

Acoustic Emission Testing – Applications and Limitations

AE can be used for the in-service inspection of pressure vessels to detect cracks that have resulted from any form of deterioration during service that can cause cracking. It can be a very sensitive NDE method for detecting cracks, but … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: | Leave a comment

Acoustic Emission Testing – Data Analysis

The data obtained from an acoustic emission test of a pressure vessel are analyzed to determine the existence of flaws and their locations in the shell of the vessel. Accurate analysis of the data is highly dependent upon the expertise … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: | Leave a comment

Acoustic Emission Testing – Acoustic Sensors and Instrumentation

Most acoustic sensors used for acoustic emission testing of pressure vessels employ piezoelectric ceramic elements that convert the stress waves (i.e., acoustic emissions) propagating through the vessel shell into electrical impulses. These sensors are usually attached to the vessel shell … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: | Leave a comment

Acoustic Emission Testing – Test Pressure

Acoustic emission tests of a pressure vessel are usually conducted by filling the vessel with water, and slowly increasing the hydrostatic pressure until it exceeds the maximum pressure that the vessel has experienced during recent operation. Early development of acoustic … Continue reading

29. April 2018 by Jack
Categories: In-Service Inspection | Tags: | Leave a comment

← Older posts