ARC Valves – best practice for pump protection

  Centrifugal pumps are one of the most common components of treatment equipment. In modern processing systems, several flow conditions are necessary to meet process requirements. Start-up, shutdown or abnormal operating conditions can therefore significantly reduce the flow rate of the system through which the flow may fall below the minimum flow rate of the pump. Below you will find the unstable minimum flow rate: High vibrations due to the operation of the high-pressure pump may be due to overheating of cavitation at lower flow rates. Typically, 30% of the flow must be recycled with the maximum efficiency of the pump (BEP) to avoid these operating conditions. The minimum flow rate is defined by the pump manufacturer. As described below, there are several ways to maintain the minimum flow at any time. Continuous diversion /bypass system The system installs deflectors or a series of baffles in the bypass line. With this installation, the minimum flow rate of the pump is always diverted to the suction cartridge. When using this system, the pump is a very large pump because of the need to pump the flow of operation and bypass the flow. Larger pumps because the reason is that the unnecessary flow is no longer a major engine bypass, resulting in significant investment costs, even if the additional 2 kW required this continuous bypass flow to obtain 0.15C per year , 17,520h in kWh kW / performance (based on the performance of 1.1 kg / kWh of coal) US $ 2,628 per year and 19.3 tonnes of CO2 consumed worldwide Best technical practices are no longer involved in efficiency and sustainability, waste disposal is no longer acceptable. Due to the high fluid velocity and cavitation through the plate, the porous plate can also have high wear. Controlled diversion/bypass system Use flow control valves and meters in this system and only bypass flow if necessary. A flow sensor is used to determine the low flow, using the actuator to open the valve and return the Aspirationstank flow. This system is very complicated and requires many components to work together, which represents a cost and may fail. These systems require high costs and high maintenance costs because all individual components require regular maintenance. VSD control Pumping systems can also be controlled by VSDs that allow different treatment conditions. Using VSD to maintain a minimum throughput requires more complex and expensive electronic components. These require cooling and control for the system to work effectively. Sizing of the valve The following information is required to determine the size of the valve. Fluid Temperature Density / specific gravity Capacity of the pump and pumphead in this case The characteristics of the pump and the minimum flow of the pump are always expected, size and rating of the pump flange (ideally, the valve should be installed in the pump) The internal structure is made of stainless steel with a minimum content of 12%. Mounting (Vertical is the standard and preferred direction of the valve, available on request)

 

Centrifugal pumps are one of the most common components of treatment equipment. In modern processing systems, several flow conditions are necessary to meet process requirements. Start-up, shutdown or abnormal operating conditions can therefore significantly reduce the flow rate of the system through which the flow may fall below the minimum flow rate of the pump.

Below you will find the unstable minimum flow rate: High vibrations due to the operation of the high-pressure pump may be due to overheating of cavitation at lower flow rates. Typically, 30% of the flow must be recycled with the maximum efficiency of the pump (BEP) to avoid these operating conditions. The minimum flow rate is defined by the pump manufacturer. As described below, there are several ways to maintain the minimum flow at any time.

Continuous diversion /bypass system

The system installs deflectors or a series of baffles in the bypass line. With this installation, the minimum flow rate of the pump is always diverted to the suction cartridge. When using this system, the pump is a very large pump because of the need to pump the flow of operation and bypass the flow. Larger pumps because the reason is that the unnecessary flow is no longer a major engine bypass, resulting in significant investment costs, even if the additional 2 kW required this continuous bypass flow to obtain 0.15C per year , 17,520h in kWh kW / performance (based on the performance of 1.1 kg / kWh of coal) US $ 2,628 per year and 19.3 tonnes of CO2 consumed worldwide Best technical practices are no longer involved in efficiency and sustainability, waste disposal is no longer acceptable. Due to the high fluid velocity and cavitation through the plate, the porous plate can also have high wear.

Controlled diversion/bypass system

Use flow control valves and meters in this system and only bypass flow if necessary. A flow sensor is used to determine the low flow, using the actuator to open the valve and return the Aspirationstank flow. This system is very complicated and requires many components to work together, which represents a cost and may fail. These systems require high costs and high maintenance costs because all individual components require regular maintenance.

VSD control

Pumping systems can also be controlled by VSDs that allow different treatment conditions. Using VSD to maintain a minimum throughput requires more complex and expensive electronic components. These require cooling and control for the system to work effectively.

Sizing of the valve

The following information is required to determine the size of the valve. Fluid Temperature Density / specific gravity Capacity of the pump and pumphead in this case The characteristics of the pump and the minimum flow of the pump are always expected, size and rating of the pump flange (ideally, the valve should be installed in the pump) The internal structure is made of stainless steel with a minimum content of 12%. Mounting (Vertical is the standard and preferred direction of the valve, available on request)

Conclusion

KP-LOK ARC valves are specially designed for process conditions to provide a fully mechanical and reliable control / bypass valve. Maintaining the minimum flow rate of the pump that provides the most efficient system and protection is the best engineering practice

 

Leave a Reply

Your email address will not be published. Required fields are marked *