Bell Energy offers wide range of Condition Assessment (CA) and Remaining Life Assessment (RLA) services for Boilers, pressure vessels, heat exchangers covering the full range of inspection, testing and condition assessment services.
- Use CFD to decide on blast loading requirements of buildings located in an onshore or offshore hazardous facility
- Use CFD to assess the heat transfer from a jet fire or pool fire to determine the fire proofing requirements on equipment and structures
- Use CFD to design sustainable and safe buildings
Bell Energy’s value added service
- Non Destructive Oxide Thickness Inspection Service - NOTIS ®
NOTIS® Non-destructive Oxide Thickness Inspection Service is a highly sophisticated; microprocessor controlled ultrasonic technique to quickly evaluate the remaining life of high temperature super heater and Re-heater tubes. Database generated with thousands of tube samples revealed that the amount of oxide scale build up inside a high temperature tube is proportional to the time period the tube has operated at high temperatures. Temperature increase can accelerate degradation or creep-rupture failure mechanisms experienced by the tubes. The oxide scale built up can be correlated to how long a tube has operated at high temperatures, knowing that will allow a direct remaining life analysis for the tube to be made.
- Furnace Hydrogen Damage Non Destructive Examination Service – FHyNES ©
FHyNES is used to locate regions of furnace that have been adversely affected by Hydrogen Damage. It employs the shear wave ultrasonic method designed to sense the change in material sound transmission properties associated with the micro cracking found in hydrogen damaged tubes. This test uses a two-transducer shear wave pitch catch technique and scans the crowns of the tubes exposed to high heat flux. By employing shear waves, FHyNES can detect hydrogen-damaged areas that would otherwise be missed. In addition to this, FHyNES can also detect severe wall thinning due to corrosion.
- Remote Field Electromagnetic Technique (RFET)
Various tube materials are encountered in boilers, petrochemical plants and various industries. These materials include carbon steel, Low alloy steel, Stainless steel, Titanium and Non-ferrous metals etc.
Remote Field Electro-magnetic Testing technique is based on the transmission of an Electro magnetic field through the tube material. The exciter coil generates eddy currents at low frequency in the circumferential direction. The Electromagnetic field transmits through the thickness and travels up to the outer diameter. The receiver coil that is placed in the remote field zone of the exciter picks up the field. In this zone, the wall current source dominates the primary field directly from the exciter. The separation between the two coils is between 2 to 5 times tube ID. Since the magnetic field penetrates the tube wall twice, it will undergo a delay (phase lag) and attenuates (amplitude attenuation). The phase lag and amplitude attenuation incurred will depend on the local wall thickness and are measured. The measurement signal is displayed on the screen.
RFET is rapid method for determining the condition of the furnace wall tubes, boiler bank tubes, and heat exchanger and tube bundles. Though both internal and external wall thicknesses can be detected and quantified, it is however not possible to determine whether the defect is located on the interior of the tube surface. The technique is volumetric inspection which detects defects such as gradual wall loss, Pitting & erosion.
By examining the bank tubes with RFET the condition of the furnace wall tubes can be addressed on tube by tube basis.
For testing ferromagnetic tubes like furnace tubes, the specially designed probe which contains magnetizing coils for saturating the ferromagnetic material and low frequency emitter and detector coils are used with suitable profile and diameter of the tube to be tested. The probe is designed for testing the tubes from external surface and profile.
- In Situ Field Metallography – Replication
Degradation of microstructure of main steam line, superheater headers, steam drum was investigated by In-situ Metallography to ascertain whether creep had initiated or any micro structural changes had taken place. This procedure provides a high quality mirror image of the micro structural features of a polished and etched surface by use of transcopy tapes. The quality of the image on the transcopy tapes is high enough to allow optical microscope examination of the image without the necessity of removing an actual header sample or boat sample.
- Fiber-optic Inspection of Internal Surfaces
Headers subjected to temperature cycling are prone to internal cracking due to thermal fatigue. Typically this originates and is most severe in the ligaments between the stub brothels. The higher the temperatures encountered, the less the magnitude of the frequency, rate of change and temperature differential necessary to cause this fatigue cracking. In addition to this, this technique enables to study the extent of internal abnormalities viz scaling, deposits, pitting, manufacturing defects of weld joints, etc.
Fiber-optic inspection is carried out for Superheater headers, Super heater coils, boiler bank tubes and Furnace water wall tubes from inside of the steam drum.
- Dye Penetrant Testing / Magnetic Particle Testing
The butt welds, adjacent heat affected zones, base metal on Steam Drum from inside and Super heater outlet header butt joints were examined using magnetic particle testing, Drum attachments, Super Heater header stub weld joints by dye penetrant examination for Surface / subsurface discontinuities.
- Stress Analysis
- Visual Inspection
- Material Testing
- Remaining Life Assessment Study Report