Last update: Jan 13, 2017
Remote Visual Inspection (RVI) is a nondestrucutive examination technique dating back to the 1970s that uses various types of videoprobes, video borescopes, remotely operated cameras, robotic crawlers, and other specialized tools in order to remotely examine components for corrosion and damage. There are several different methods of RVI that can be used to inspect a variety of equipment.
In its most basic form, an RVI system is made up of a lens and an illuminating light source, both of which are connected to a light transmitting extension, at the end of which is attached a viewing eyepiece. Most modern designs though, are more complex. Several make use of fiber optics or distal LEDs as light sources. On-board computers can also be utilized to improve functionality of the systems.
The three major methods of RVI are (1) Comparison Measurement, (2) Stereo Measurement, and (3) Shadow Measurement.
RVI can be used to examine equipment as diverse as boilers, steam and gas turbines, generators, heat exchangers and condensers, tanks and vessels, rotating equipment, welds, and piping systems for flaws and corrosion. Used with extraction tools, RVI also has applications in foreign object search and retrieval.
The primary advantage of RVI is that it allows for the examination of most plant systems and components without requiring confined space entry or disassembly. It can therefore be considerably less expensive than other methods. Likewise, it’s far safer than traditional methods of inspection which involve sending inspectors into unsafe conditions.
Recommend changes or revisions to this definition.
February 2, 2015 By John Reynolds at Intertek
The development of advanced NDE techniques/tools is one of the reasons the inspection trade has taken significant steps forward in the last couple decades; and the advancements appear to be accelerating. One of the many ways to keep up with advancing NDE technology is to attend the semi-annual NDE task group meetings at the Spring and Fall API Refining and Equipment Standards Meetings. In fact, that T/G is planning to document many of the advanced NDE...
If you are developing a mechanical integrity program, or you would like to optimize your existing mechanical integrity program, do you have qualified MI consultants to meet your regulatory needs? If you already have a sound, defensible MI inspection system in place, do you have qualified and experienced personnel maintaining your program?