Category Archives for Inspection

Heat Exchanger Safety Instruction Sheets

Safety Instruction Sheets (SISs) are used by several organizations as a singlesource summary document for important data on operating equipment. These data are important to operations, technical groups, inspection and maintenance, and they include: • Safe operating limits (temperatures, pressures, … Continue reading

05. April 2018 by Ben
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Heat Exchanger Pressure Testing Techniques

In general, exchangers out of service for repairs are pressure tested before the repairs to determine where work is required and after repairs to determine if the exchanger meets code requirements. Test Pressures The code hydrostatic test pressures are calculated … Continue reading

05. April 2018 by Ben
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Heat Exchanger Inspection Techniques

• Ultrasonic (UT) gaging can be used to determine remaining wall thickness of the shell as well as defects in the wall. • Micrometer measurements are used to determine tube wall thickness, depth of pitting, and metal loss on body … Continue reading

05. April 2018 by Ben
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Types of Damage Found In Exchangers

The various types of damage found in exchangers are discussed below. Refer to the Corrosion Prevention Manual for more information. End impingement—where high velocity stock enters the tube and erodes the end. This can involve the tubesheet as well. Galvanic … Continue reading

05. April 2018 by Ben
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Inspection of State Registered Unfired Steam Generators

Like fired boilers, unfired steam generators require periodic inspection and state certification by qualified boiler inspectors. Generally, unfired steam generators are of tubular heat exchanger design. Consequently, inspection and repair follow the same general pattern as that used for process … Continue reading

05. April 2018 by Ben
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Inspection of Existing Double Pipe Exchangers

Double pipe or “hairpin” exchangers can be one pipe or several pipes inside another pipe. In either type of exchanger the corrosion is usually found in the area of the inlet nozzle and at the return bend. All these units … Continue reading

05. April 2018 by Ben
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Inspection of Existing Shell and Tube Exchangers and Air Cooled Exchangers

Inspection of existing exchangers and air coolers involves the following steps: 1. Set objectives as discussed above. 2. Examine inspection and maintenance records to note any trends and make initial recommendations. 3. Perform preshutdown inspection to note leaks and any … Continue reading

05. April 2018 by Ben
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Air Cooled Heat Exchangers Shop Inspection

Figure 900-2 identifies the degree of inspection for air cooled heat exchangers. Degree 5 is about the minimum for any air cooled exchanger in hydrocarbon or critical service. Factors similar to those listed in Section 913 above are used to … Continue reading

05. April 2018 by Ben
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GUIDELINES FOR CHOOSING THE APPROPRIATE DEGREE OF INSPECTION FOR SHELL AND TUBE HEAT EXCHANGERS

Degree 1 when: 1. No Company specification applies, and 2. Exchanger: a. is small and simple (under 18 inch diameter), and b. is carbon steel (tubes can be another material), and c. has low pressure rating (under 250 psig), and … Continue reading

05. April 2018 by Ben
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Shell and Tube Exchangers Shop Inspection

Figure 900-1 identifies the different degrees of inspection for shell and tube exchangers. Figure 900-3 summarizes when to use the various degrees. Degree 4 is about the minimum for any shell and tube exchanger in hydrocarbon or critical service. Degree … Continue reading

05. April 2018 by Ben
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