FINFANS - IMPORTANT TOPICS IN FINFANS

 FINFANS - IMPORTANT TOPICS IN FINFANS

WHAT IS FINFAN?

• To cool the fluids through fined air-cooled tubes with intensity of positive flow of air from a fan called fin-fan. 

WHAT ARE VARIOUS MEASUREMENTS TO BE TAKEN ON FINFAN?

1). BLADE ANGLE

2). TIP TRACK

3). BEARING THRUST ALLOWANCE

4). FIT OF FAN HUB AND SHAVES WITH SHAFT

5). ALIGNMENT OF BELT DRIVE

HOW DO MEASURE BLADE ANGLE? WHAT IS INSTRUMENT USED? HOW DO ADJUST?

• Measuring angle with the use of bevel protractor positioned on the blade one - inch distance from the tip of blade. angle is adjusted by releasing blades free to rotate from hub.

HOW DO MEASURE TIP TRACK?

• Tip track is the difference in the same line of rotation in the tip of all blades. it is measured by marking line the end of blade with frame.

WHAT IS FRP BLADE?

• FRP BLADE IS FIBER REINFORCED PLASTIC BLADE. it is coated on sheet metal formed fan blade. 

ADVANTAGE:

• less weight

• high strength of bending and low cost

WHAT ARE THE VARIOUS METHODS OF FIXING THE BLADE TO HUB? 

1). By hub split clip locking

2). flanged bolt with slotted hole

3). tensioned bolted with segmented lock rings. 

WHAT ARE THE VARIOUS METHOD OF DRIVE ARRANGEMENT AVAILABLE FOR FINFAN?

1). Direct couple with motor shaft

2). Belt drive

WHAT ARE THE PREVENTIVE MAINTENANCE JOBS CARRIED OUT ON A FIN FAN?

1). Periodic vibration measurement

2). Lubrication of fan bearing

3). Checking belt condition 

4). Measuring any noise operation