In-Service Inspection

The in-service boiler or HRSG inspection has the advantage of being able to be conducted at nearly any time. It encompasses the external components of and typically refers to a unit that is running (or "hot"), but can also encompass a unit that is ready to run and in standby.

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In-Service Inspection

The in-service hot inspection aims to check for (steam, water, air, exhaust) leaks , hot spots, mechanical damage, unusual movement and excessive noise or vibration on the boiler piping, casing, air/exhaust ductwork as well as associated vessels and drums.  The usual techniques used are visual observation and thermography. In some cases Tetra Engineering may suggest more elaborate techniques as an option, such as installing thermocouples or vibration sensors to gather data for a particular known problem issue.    

Besides the field inspection, an effective in-service inspection requires an examination of process data for the time of inspection and for a representative interval (such as several months) preceding that time.  This provides the Tetra inspector with useful context for comparison with the conditions that were observed in the field. 

In-Service Inspection
In-Service Inspection
In-Service Inspection

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Related HRSG & Boiler Inspections Services

In-Service Inspection

In-Service Inspection

The in-service boiler or HRSG inspection has the advantage of being able to be conducted at nearly any time. It encompasses the external components of and typically refers to a unit that is running (or "hot"), but can also encompass a unit that is ready to run and in standby.

learn more
Boiler & HRSG Offline Inspections

Boiler & HRSG Offline Inspections

The offline (or cold) inspection is an essential O&M activity at any thermal power or process plant. For steam generating equipment, whether it's a small industrial package boiler or a large utility-scale supercritical coal boiler, this is especially critical since only during a shutdown can the condition of all internal components be assessed in detail.

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Borescope Inspection

Borescope Inspection

The borescope is an essential tool for inspecting of power plant components. Commonly used in high-value rotating power-plant equipment such as steam turbines, gas turbines and generators it is also extremely useful for checking the internal or to reach external surfaces of boiler and HRSG tubes and piping.

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Remote/Offsite Inspection Support

Remote/Offsite Inspection Support

In the case where travel time or logistics prevent a Tetra inspector from being present on site, inspections can be conducted remotely in collaboration with client staff

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Tuning of Control and Monitoring Systems

Tuning of Control and Monitoring Systems

Improving or rectifying the operation of process control and monitoring systems in a thermal power plant is an important activity. This can entail both in-service and outage activities, and is an important corollary to an effective inspection program.

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Welding Repair/Refurbishment Supervision

Welding Repair/Refurbishment Supervision

The quality of the thousands of factory and field welds present in the pressure part modules of a thermal power plant is critical for assuring long-term reliable operation.

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Inspection Planning & Supervision

Inspection Planning & Supervision

Tetra can provide experts to assist your staff in planning upcoming outages, as well as provide on-site supervision and surveillance to assure work quality and schedule.

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Drone Inspection

Drone Inspection

As part of the Tetra Engineering inspection services, we offer remote visual assessments of your boiler/HRSGs using quadcopter drone technology

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Grade 91 Low Alloy Steel Concerns for Older CCGTs
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Grade 91 Low Alloy Steel Concerns for Older CCGTs

Grade 91 is a CSEF (creep strength enhanced ferritic) alloy introduced in the late 20th century for high temperature service in power boilers. ASME BPVC-II develops material properties based on time-to-rupture data after 100,000 hrs, with a safety factor of 3.5. 

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