The function of the pump’s protection wire
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There are six types of protection wires for pumps: heating pump wires； Low-flow line ； balance line ； bypass wire ； Anticoagulation line ； Safety valve wire. Under what conditions and which type of protective wire should be used? What is his role?
It was only the first time that I learned there are so many protection wires for pumps; I only knew about the low-flow wire； balance line ； The function of the bypass line and the safety valve line
There are 6 types of protection lines for pumps, whose purpose is to prevent damage to the pump and ensure its proper operation; the protection lines for pumps are selected based on the operating conditions. 1. Warm pump line – When transporting high-temperature oils with a temperature exceeding 200°C, a DN20–25 warm pump line should be installed if a spare pump is available ； 2. Low-flow line – When the pump’s operating flow rate is 30% below its rated flow rate, a low-flow line should be provided to allow the pump to operate normally at that lower flow rate ； 3. Balance line – For liquids with a saturated vapor pressure at room temperature that is higher than atmospheric pressure, or liquids that are in the bubble point state, a balance line must be installed to prevent vapor from forming in the liquid entering the pump or bubbles from entering the pump and causing cavitation ； 4. Bypass line – used for the trial operation of the pump, or to keep the pump running when the main outlet valve is closed under abnormal operating conditions. Bypass valves equipped with flow-limiting orifices are generally installed in situations where the pressure difference before and after the valve is very high ； 5. Anti-condensation system – When transporting liquids with a high pour point or high freezing point that solidify at normal temperatures, anti-condensation systems should be installed in the standby pumps and pipelines to prevent them from getting clogged ； 6. Safety valve line – For positive displacement pumps such as electric reciprocating pumps, gear pumps, and screw pumps, a safety valve line is provided on the outlet side; when the outlet pressure exceeds a set value, the safety valve opens and the fluid returns to the pump’s inlet pipe.
The anticoagulation line should be called an anti-freezing and anticoagulation line, and it is usually installed between the pump outlet and the check valve. Its main purpose is to be used as a backup pump in winter to prevent freezing in areas where there are dead zones.
Could some expert explain the specific working principle? :)