Axial flow main fan

The pressure should be above 0.00, right?

Are you sure the pressure difference across the inlet filter is that high? 157.6KPa？ What is the model of your axial flow fans?

The pressure difference of this filter is too high, isn’t it?~

This filter must have been in use for some time; an alarm is triggered when the differential pressure at the inlet filter of the main fan (axial flow fan) in a catalytic cracking unit reaches 200 kPa. At this point, the operator needs to go to the site to replace the filter element or inform the relevant personnel to clean the filter

This post was last edited by SAN*NGR428 on 2015-10-14 at 12:00. It’s reasonable to use Pa as the unit. For axial flow main fans, since their blades are very sensitive to dust, sandblasting is carried out after blade shaping and frequency measurement in order to enhance the fatigue resistance of the blade surface. The inlet filter of axial flow fans has a high filtration precision; in my case it is 3um, and it is a plate-and-frame filter. Generally, the total pressure loss in the fan inlet duct is not high; including the differential pressure across the filter, all losses are less than 3 KPa. A flow rectifying grid is installed at the bend of the inlet pipe, and the inlet flow rate is measured by the pressure difference at its throat. As the filter pressure difference increases, the input power of the main fan rises significantly; therefore, it is generally necessary to clean the plate and frame filter elements before the negative pressure valve (mechanical type) of the plate and frame filter automatically opens. Here, the opening value for the negative pressure valve is 1200 Pa, and the alarm threshold for differential pressure in the filter is set at 500 Pa. When this value exceeds 500 Pa, the backup main fan will be activated at an appropriate time to clean the plate-and-frame filter of the axial flow unit. So, the 156.7 Kpa mentioned by the original poster seems absolutely unbelievable to me.