Installation and use of fan

 

T30 flow fan  type fan only gives the non-dimensional performance table of №10 sample fan (see table1). The dimensional performance of the fan can be calculated with given non-dimensional performance table.

The dimensional parameter formula is calculated with non-dimensional

parameter.

If it is in non-standard state when operating, the performance of non-standard standard state must be converted to the performance of standard state. And then select fan according to the converted performance. The converting formula is as follows:

           

     

Installation and operation of the fan

Before installation: Check all components of the fan to see weather any thing is missed; weather the impeller rotates in the same direction as the casing; weather all components are connected tightly and weather the impeller rotates freely.

During installation: Pay attention to check the casing and any tools or goods should not be dropped and remained inside the casing. The connecting face between the support of the fan and the foundation or between pads and foundation should be tight. Adjusting should be made to joint the fan with foundation surface and to connect the fan with suction, discharge duct naturally. Forced assembling, especially, applying weight of pipes on any components of the fan isimpermissible. Also, attention shall be paid to the horizontality of the fan.

Requirement of installation:
(1) Install the fan according to the position and sizes shown on the drawing. To

insure high efficiency, radial and axial clearances between inlet and impeller must be guaranteed.

(2) After installation, turn, with a little force, the driving rotor to see if it is over

tight or touched with stationary components.

(3) Commission Can only be carried out after the unit is through the final

inspection. In order to prevent the motor being burnt out due to overloading, the fan

can only be started up and tested without loading. If the case is ok, increase the load

step by step until the rated operating condition is reached. Control the current strictly

during operation to prevent it exceeding the rated value.

Operation of the fan:

 (1) Before starting-up, the following preparations shall be made:

a) Close the valve of suction pipe and open a little the valve on discharge pipe.

b) Check the rotating and non –rotating parts to prevent colliding and friction.

(2) After the fan is started-up and the normal speed is reached, check the bearing temperature is normal or not during the operation. If there is no special requirement for bearing temperature, the temperature rise of the bearing shall not exceed 40℃of surrounding temperature. The value of even root vibration speed of the bearing shall comply with the following rules: rigid support(support is fixed on the foundation) Vrms≤4.6mm/s; flexible support(be set onfoundation or floor through absorber) Vrms≤7.1mm/s. In case that severe vibration, colliding, quick rise of bearing temperature and other abnormal phenomena are found, stop the fan immediately.

Maintenance of the fan

1) Cautions in fan maintenance:

①The fan can only be put into operation in normal condition.
②When the fan is started-up after inspection, attention should be paid to see

weather each component is ok or not.

③Check periodically the dust and contamination inside the fan to prevent rust.

④Maintenance can be carried out during shut down of fan to assure operators

safety

2) Cautions in normal operation of the fan

①During the star-up, shut-down or operation of the fan, if some abnormal thing

happens, inspections shall be carried out immediately; if it is small failure, the reason shall be checked out and eliminated, if it is a big failure, the fan shall be stopped and inspection and maintenance shall be made immediately.

②Replace lubricant grease of motor bearing according to the real condition.

The main failure and reason of the fan

1) severe vibration of the fan

①friction between casing (or suction unit)and impeller.

②Foundation is not rigid enough or firm enough.
③loosing of rivets in impeller or deformation of impeller.
④Loose match of shaft with impeller disc
⑤Loose of connecting bolts between casing and support, and between motor and

support.

⑥The installation of inlet and outlet ducts is improper which causes the casing

deformation and resonance.

⑦Rotor unbalance caused by dust, contamination on blades, wear of blades,

deformation of impeller and bending of shaft.
2) High rise of bearing temperature
①severe vibration

②lubricant is poor in quality, deteriorated, mixed with dust, sand, contamination

and etc, or insufficient in quantity.

③Wornout of rolling bearing
3) Overcurrent and high temperature rise in motor.
①The valves on inlet and outlet pipes are not closed completely when starting-up.

②Input voltage is low or a single phase of power supply is cot out.
③Influence caused by severe vibration
④The speed of main shaft is bigger than the rated value.

Supply scope of fan unit

One fan, one driving motor and 4 sets of foundation bolts

Purchase information

1）when purchasing, indicate the size, speed, flow, pressure, discharge angle and rotating direction of the fan, and the model, power, and speed of the motor.

2）Also, indication shall be made clearly when ordering, if you need inlet filter, silencer, inlet and outlet soft connection, vibration absorbing platform and vibration absorber.

Huashide(shandong)fan Co.Ltd

Http:www.hsdfans.com

Add:kunmingrod.linyi.P.R.china

E-mail:17853928877@163.com

 Http:www.hsdfans.com

Tel: 17853928877