How much pressure should the Roots blower not exceed? Operation Red Line Guide**
**Key words: threshold, protective measures, consequences of violations
**1、 The legal significance of nameplate parameters**
-Rated pressure: The manufacturer's promised upper limit for continuous operation (such as 80kPa).
-Instantaneous withstand voltage: usually 120 (short-time withstand) of the rated value.
**2、 Industry standard requirements**
-GB/T 8946-2022 stipulates that the valve must be activated when the fan experiences an overpressure of 10.
-OSHA standard: Pressure vessels require annual inspection, and if the shell wall thickness is worn out by more than 10, it will be scrapped.
**3、 Key points of user operation manual**
1. * * Prohibited behavior * *:
-Close the outlet valve and operate (hold pressure)
-Parallel fan without check valve installed
2. * * Must be configured with * *:
-Pressure gauge (range ≥ 1.5 times rated value)
-Dual relay protection (electrical+mechanical)
**Accident case * *: A certain feed factory experienced a sudden increase in pressure due to the accidental closure of a valve. After the valve failed, the gearbox cracked, and the repair cost exceeded 50000 yuan.
What is the normal pressure of Roots blower? Industry standards and working condition analysis**
**Key words: rated pressure range, working condition adaptation, abnormal judgment
**1、 Normal pressure range of Roots blower**
The design pressure of Roots blower is usually divided into three levels (according to GB/T 8946-2022 standard):
-Low pressure type: 9.8~49kPa (suitable for sewage treatment aeration and aquaculture)
-Medium pressure type: 49~98kPa (commonly used in pneumatic conveying and electroplating tank mixing)
-High pressure type: 98~196kPa (used in special scenarios such as chemical gas recovery)
**Note: Customization design is required for pressures exceeding 196kPa, resulting in a significant increase in cost.
**2、 Key factors affecting actual stress**
1. * * Back pressure resistance * *: Pipe bends and filter blockages can cause pressure to rise (for example, in a certain factory, the pressure increased from 50kPa to 80kPa due to pipeline scaling).
2. * * Altitude * *: For every 1000m increase in altitude, the atmospheric pressure decreases by about 10, and the outlet pressure of the fan needs to be recalibrated.
**3、 Determination and Handling of Abnormal Pressure**
-* * Pressure too low * * (below rated value of 30):
-Possible reasons: impeller wear, belt slippage (solution: replace impeller/adjust tensioner)
-Excessive pressure (exceeding the set value by 10):
-Immediately check if the valve is malfunctioning and shut down to investigate pipeline resistance.
**Case * *: A cement plant experienced a surge in pressure from 60kPa to 95kPa due to a clogged dust collector bag, triggering a valve to release pressure.
**4、 Selection suggestions**
-Wastewater treatment: choose a 49kPa model (such as CSR-150 model);
-Vacuum packaging: requires -50kPa negative pressure models (such as CSR series).
