What is DP test of boiler?

What is DP test of boiler?

Dye penetrant inspection (DP), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics).

What is DP plate in boiler?

8-What do you mean by DP test in AFBC Boilers? It is the test carried out before the light up of Boiler to ensure the healthiness of air nozzle & bed plate.

What is differential pressure in boiler?

The differential pressure signal is normally elevated, electrically or pneumatically, so the output signal corresponds to the level in the boiler. 0% of water in the level glass corresponds to 4 mA (3 psi) and 100% corresponds to 20 mA (15 psi).

What is CFBC boiler details?

The Circulating Fluidized Bed Combustion(CFBC) boiler is the most advanced steam generatortechnology. Among many distinguishable advantages of CFBC boilers, itachievesvery low NOx and Sox emission by capturing sulfur contents of the fuel during the burning process.

How do I check my DP?

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1. Penetrant. Apply the penetrant to the test area. Allow the penetrant to dwell for 10-30 minutes.
2. Developer. Apply the developer to the test area. Allow the developer to dwell for 10-60 minutes.
3. Inspect. Examine the part for any bright, clear indications.

What is DP test kit?

DP kit consist of 3 Different items… 1. DEVELOPER SKD – S2: is ready to use suspension of white developing particles in a fast-drying solvent. CLEANER/REMOVER SKC-I: is a clear, flammable solvent, lighter than water. SKC – I is used as a pre-cleaner a post cleaner and a penetrant remover.

What is bed height in boiler?

BED HEIGHT / FD AIR PRESSURE • Static height for AFBC boiler is to be maintained 250 to 300mm during initial light up of boiler. of Primary Air Pressure & F.D. Wind Box pressure is to be maintained approximately 500 mmwc. High P.A. Pressure increases the high bed coil erosion and carryover. Low P.A.

How do you control LOI on a boiler?

10-tips to reduce LOI/unburnt in Boilers

1. Optimization of fuel moisture in the fuel:
2. Maintaining balanced draft in furnace:
3. Maintaining 3Ts of combustion:
4. Increasing the secondary air quantity & pressure:
5. Maintaining the required excess air:
6. Using correct or designed GCV of a fuel:

How does a DP transmitter work?

Any difference of pressure across the cell causes the diaphragm to flex in the direction of least pressure. If too much pressure is applied to that side, the isolating diaphragm will merely “flatten” against the solid frame of the capsule and stop moving. …

How is drum level calculated?

The drum level is measured using a differential pressure transmitter. Refer to the drawing on the right. The output of the instrument increases as the differential pressure decreases. A typical range is 30 inches of water column.

How does a CFBC boiler work?

In general, CFBC Boiler takes the biomass or coal and other solid fuels as its fuels. Boiler in which coal or biomass is burnt in an environment of high concentration of bed material (mineral matter) derived from combustion of coal retained by using cyclone / other means. This ash reduces combustion temperature.

What is the difference between Afbc and CFBC boiler?

AFBC is atmospheric fluidized bed combustion, where the furnace pressure is atmospheric pressure. As for CFBC, circulating fluidized bed combustion, the furnace is pressurized and the furnace gas is recirculated to capture the unburnt carbon, to increase the thermal efficiency of the boiler.