The semi submersible vertical long shaft multi-stage deep well turbine pump is a vertical long shaft centrifugal pump designed specifically for deep water level firefighting water intake scenarios. Its core advantages are no need for pre injection water intake and fast start-up response, fully complying with the mandatory standard GB6245 "Fire Pumps". The semi submersible vertical multi-stage long shaft deep well firefighting turbine pump is the core water supply equipment for underground deep water tanks and large space firefighting systems.
🔧  Core structural characteristics
Full semi submersible pump head design: The impeller and water filter are completely submerged below the liquid level of the fire water tank, with a minimum submergence depth of only 1 meter, without the need for matching suction pipes or bottom valves, eliminating the risk of cavitation.
Multi section customizable long shaft: The transmission shaft adopts a multi section flange splicing structure, with a conventional customized underwater depth of 1-10 meters, and can be extended to 12 meters under special deep water conditions. The concentricity error of the shaft system is strictly controlled within 0.05mm.
Double bearing lubrication system: The upper rolling bearings are lubricated with grease, while the lower liquid guide bearings can self lubricate through the conveying medium. For conditions containing sediment, they can be externally cooled and lubricated with water at a pressure of 0.2 MPa or above.
Leak free shaft seal structure: traditional mechanical seals are eliminated, and packing seals or special unsealed designs are adopted to completely avoid medium leakage and pollution of the fire protection system during operation.
📊  Typical performance parameters
parameter item
Industry wide scope
Rated flow rate of 30~8000 m ³/h
Total head 10-200m
Medium temperature ≤ 55 ℃, special material can withstand high temperature of 120 ℃
Start response time ≤ 10 seconds
Operating vibration value ≤ 4.5mm/s
Pressure bearing capacity of overcurrent components ≥ 1.6MPa
🏭  Main application scenarios
Deep water level fire water intake: Suitable for underground fire water tanks buried at depths of 3-20 meters, it is the preferred equipment for super high-rise basement fire protection systems in scenarios where ordinary self-priming pumps cannot complete water intake.
Petrochemical industry fire protection system: The fire cooling water sprinkler and fire water cannon supply in the petrochemical tank area and refinery unit area can be directly taken from the deep pit fire water tank.
Large public facilities: airport hangars, large commercial complexes, exhibition centers, and sports venues with large space fire water cannon systems to meet the demand for high flow and high lift water supply.
Special water intake scenario: water is taken directly from the open water source of rivers, lakes and reservoirs, and can also be used for the fire sprinkler system of underground mine and tunnel engineering.
Marine engineering scenario: Offshore drilling platforms, ship engine room fire protection systems, using copper impellers or 316 stainless steel materials to resist seawater corrosion.
✨  Core operational advantages
Extremely reliable start-up: The impeller is always submerged in water, without the need for water injection or vacuum pumping. It can be synchronously pressurized and supplied with water upon start-up, completely eliminating the risk of start-up failure caused by no water in the pump.
Extremely small footprint: The vertical structure is directly installed at the top of the water tank, requiring only two support beams to support and fix it, without the need for additional pump room space. The infrastructure investment is reduced by more than 40% compared to horizontal fire pumps.
Stable operation and long service life: The radial runout of the shaft system is controlled within 0.13mm, with low operating noise and vibration. The overcurrent components are treated with wear-resistant coatings, and the service life of the semi submersible vertical multi-stage long shaft deep well turbine pump is extended by 30% compared to ordinary fire pumps.主力设备。

🔧 核心结构特点

• ‌上置干式电机布局‌：电机、轴承等不耐高温部件全部布置在地面，通过多节高精度长轴传递扭矩，电机维护无需下井作业，电气安全性大幅提升。

• ‌多级叶轮串联增压‌：通过多组叶轮逐级提升介质压力，总扬程为各级叶轮扬程之和，可通过增减叶轮数量灵活调整扬程，轻松实现数百米超高扬程输出。

• ‌分段式长轴传动‌：传动轴采用多节高精度拼接结构，搭配多组中间轴承支撑，轴系同心度误差严格控制在0.05mm以内，避免长距离传动时出现振动摆动。

• ‌双轴承润滑系统‌：上部滚动轴承采用油脂润滑，下部液下导轴承可选赛龙、碳纤维、填充聚四氟乙烯等材质，清洁介质可实现自润滑，含颗粒污水工况可外接0.2MPa以上压力清水冷却润滑。

• ‌无机械密封设计‌：取消传统外露机械密封，从根源上杜绝介质外漏风险，适配腐蚀性、易燃易爆介质输送场景，大幅提升运行安全性。

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📊 典型性能参数

🏭 主要应用场景

• ‌深液位高扬程抽取‌：适配深井、深埋式消防水池、大型地下储罐的高扬程取水场景，彻底解决普通离心泵吸程不足的痛点。

• ‌工业高扬程供水‌：火电厂、化工厂的锅炉给水、高压循环水系统，直接从深水池取水，单台泵即可完成数百米高扬程输送，无需多台泵接力加压。

• ‌矿山深井排水‌：金属矿、非金属矿的井下深部积水提升，可将数百米深的矿井积水直接输送至地面，适配高扬程、大深度的矿山排水工况。

• ‌化工腐蚀性介质输送‌：输送酸、碱、盐等各类腐蚀性液体，以及含少量固体颗粒的化工浆料，广泛应用于化工制药、冶金电镀、造纸等行业。

• ‌特殊取水场景‌：山区农村安全供水、地热温泉开采、海上平台海水提升，适配各类无自灌条件的大深度高扬程取水场景。

✨ 核心运行优势

• ‌启动可靠性极高‌：叶轮始终完全浸没在液面以下，全程实现自灌供水，开机即可出水，完全杜绝普通离心泵因吸空、气蚀导致的启动失败风险。

• ‌超高扬程输出‌：多级叶轮串联结构可轻松实现数百米扬程，单台泵即可完成从深井到地面数百米的垂直提升，无需配置多台泵接力加压。

• ‌占地与基建成本低‌：立式结构直接安装在水池、罐体顶部，仅需少量安装基础，无需额外大空间泵房，基建投资比同参数卧式多级泵减少40%以上。

• ‌维护便捷安全‌：电机位于地面，日常巡检、保养无需下井，可抽芯式转子设计无需拆卸外部管路，直接抽出内部组件即可完成检修，大幅缩短停机维护时间。

• ‌工况适配性极强‌：可根据介质特性、液下深度、扬程需求灵活定制材质、轴长和叶轮级数，覆盖从清水、污水到强腐蚀介质的全场景输送需求。

• ‌运行稳定寿命长‌：轴系径向跳动控制在0.05mm以内，运行噪音低、振动小，平均无故障运行时间（MTBF）可超过18000小时，长期24小时连续运行仍能保持稳定性能。

关键运行禁忌：严禁干运行，必须设置低水位自动停泵保护装置，避免水位过低导致轴承干磨烧毁；长轴安装时必须保证整体垂直度偏差≤0.1mm/m，否则会加剧轴承磨损，甚至导致传动轴弯曲断裂。