High-head Double-suction Centrifugal Pump

The high-head double-suction centrifugal pump is based on the standard S/SH double-suction open impeller pump. By increasing the rotational speed (2950 r/min with 2 poles), enlarging the outer diameter of the impeller, optimizing the outlet angle of the blades and the expansion ratio of the volute, a composite structure of "first-stage double-suction + secondary-stage double-suction in series" or "double-suction first stage + multiple-stage rear section" will be adopted. However, the casing still remains a horizontal open type.

First-stage impeller anti-cavitation strengthening: For 2950 double-suction with NPSHr of 5-8 m at startup, the inlet section of the first-stage impeller is widened, the inlet edge is extended forward, the inlet installation angle α₁ is optimized (usually 18-24°), the pump body suction vane chamber is rounded - these are the hidden points that differ from the "same-diameter 1450 double-suction" drawings.
Rotor rigidity & critical speed: At 2950, the slender ratio of the rotor is more critical than that of 1450. The shaft diameter needs to be thickened and the span needs to be calculated for the critical speed ≥ 1.3 times the operating speed; the stiffness of the bearing housing is strengthened (although the axial residual force of the high-yield double-suction is mostly digested by self-balancing, there are still slight residual pulsations at 2950, and thrust bearings need to be retained).
Bearings and lubrication: Drive end + non-drive end, radial rollers + thrust balls/thrust rollers combination (for 1450 double-suction, sometimes only radial bearings are sufficient, for 2950 high-yield, thrust bearings are necessary); large machine with thin oil lubrication + oil cooler (for high-yield + 2950, the bearing heat is 30%-50% higher than that of 1450).
Seals (high-yield is the key point): The seal chamber of the high-yield double-suction has high pressure-bearing capacity (0.8-1.0 times the outlet pressure), it must be equipped with Plan 21/52 flushing or the auxiliary impeller pressure reduction + packing combination - do not directly use the low-pressure seal, otherwise the "spray" in the seal chamber will be frequent after-sales issues.

Power plant circulating water / cooling tower differential feedwater: The power plant condenser cools the circulating water, and the height difference between the cooling tower and the pump room is 60–120 meters. With pipeline losses, it reaches 100–150 meters. The flow rate is large (800–2500), and it is a high-head double-suction design that is just right; for high-temperature type (≤150℃), it needs to be equipped with seal cooling + bearing cooling.
Main mine drainage: The mine has a large water inflow (500–2000 m³/h) + a height difference of 120–200 meters for the pump room (deep well). The high-head double-suction design is more suitable for multiple-stage D parallel connection to save space and be easier to maintain; for mining use, it requires an EX motor + MA certification.
Large-flow process water for chemical plants: The water pump for chemical plants, with a flow rate of 200–1000 and a height difference of 100–180 meters. It requires mid-open maintenance + upgradeable material (duplex / stainless steel). The "maintainability" of the high-head double-suction design is more popular in chemical plants.
Municipal high-level water supply and pressure boosting: In mountainous cities (Chongqing, Guiyang, Kunming), the municipal water pipe network requires secondary boosting with a height difference of 100–150 meters and a flow rate of 200–800. Both efficiency and maintenance are required.

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