One engineering family for deep wells, wet pits and can sumps: multi-stage diffuser bowl pumps driven by vertical hollow-shaft or solid-shaft motors, diesel right-angle drives and NFPA 20 vertical turbine fire pump packages — flow to 12,000 m³/h and head to 450 m.
Also known as: vertical turbine pump · vertical line shaft pump · vertical long shaft pump · deep well turbine pump · turbine well pump · wet pit pump · vertical multistage well pump · vertical mixed flow pump · vertical axial flow pump · vertical turbine fire pump
Every build below shares the same wet end DNA — multi-stage diffuser bowl assembly, open or enclosed line shaft column, and a discharge head that carries thrust and aligns the driver. What changes is the driver, the setting and the hydraulic. As experienced vertical turbine pump manufacturers since 1967, we configure each unit around your well log, sump drawing or duty point. The line-up spans deep well turbine pumps for boreholes, vertical line shaft pumps for open sumps, vertical turbine fire pump packages to NFPA 20, and vertical mixed flow and axial flow pumps for high-volume, low-head duties.
The classic deep well turbine pump. The hollow-shaft motor sits on the discharge head; a clutch-type drive coupling allows impeller adjustment from the top of the motor without dismantling the unit — the shaft stretches and the impellers are set precisely against the bowl seals.
For higher power and special voltages: a solid-shaft motor with a separate non-reverse thrust carriage in the discharge head. Preferred in power plant and heavy industrial duties where the motor is specified by the EPC rather than the pump maker.
When the liquid level is below floor level or the pump must be isolated from the pit, the bowl assembly runs inside a can (barrel) with suction from the bottom or side. Standard for condenser cooling, desalination intakes, transformer-oil and chemical sumps.
A vertical barrel-type multistage mixed flow pump for large capacity at high head — the step between a deep well line shaft unit and a full can pump. Double-suction first stage option reduces NPSH requirements; ideal for long-distance water transfer and high-rise boosters.
The volume mover: a vertical propeller pump for drainage, flood control, circulating water and brine transfer. Adjustable-pitch impellers, slow speeds and corrosion alloys — detailed on our ZLH vertical axial / mixed flow pump series page.
Between axial and radial: our CFD-optimized vertical mixed flow pump (also called salting-out or low-temperature crystallization pump). Optimized elbow passage, adjustable impeller, suction-bowl diameters from 225 to 3,100 mm — built for salt works and alkali process brines.
A vertical long shaft pump for open sumps and drainage pits: motor and discharge nozzle sit above floor level while the wet end and column work below. Standard for pit drainage, transfer and light chemical duty; open or semi-open impellers handle solids, and minimum wetted length is set to your sump drawing.
Complete fire packages built around a vertical turbine fire pump: electric-motor or diesel-engine drive, jockey pump, controller and accessories assembled and tested as one skid. Listed duty points only — the fire water pump is selected strictly on the approved curve, never interpolated, with electric and diesel backup options.
When the borehole is narrow, crooked or the setting too deep for a line shaft, the same bowl assembly runs under a submersible motor. Shares hydraulics and parts with our line shaft range — a natural second option in every deep well tender.
A vertical turbine pump is built from four stacked modules. Understanding the split lines is what makes these pumps so serviceable — each module can be pulled and rebuilt independently. The layout is shared by every vertical line shaft pump and deep well turbine pump we build: threaded or flanged column above, water- or oil-lubricated shaft bearings inside, bronze or stainless impellers below. Knowing each module by name also makes ordering spares and wear parts straightforward.
1 · Driver & discharge head. Carries the whole pump weight and the hydraulic axial thrust. VHS motors include a non-reverse ratchet and a top-adjusting clutch coupling; VSS motors pair with an external thrust block; diesel and vertical turbine fire pump builds use a right-angle gear drive. Discharge heads are offered with top, side or below-floor (sump) discharge nozzles, and can-type builds take side or bottom suction nozzles to match your vessel piping.
2 · Column pipe & line shaft. Connects head to bowls. Open line shafts use product-lubricated rubber bearings; enclosed line shafts isolate the shaft in a tube with oil or clean-water flushed bearings — mandatory for sandy wells. Column sections join by threaded couplings or flanges (flanged standard above 75 mm and on fire duty), each supplied with a matched line shaft held to run-out limits so bearings reach full design life.
3 · Bowl assembly. The heart: suction bell, impellers and diffuser bowls stacked per stage. Impellers are bronze or stainless, balanced, and threaded on a collet-type hub so axial setting can be trimmed from the top.
4 · Suction & strainer. Suction bell plus strainer sized to keep inlet velocity low; for can-type builds, side or bottom nozzles per your piping.
| Sealing | Best for | Notes |
|---|---|---|
| Standard packing | Clean water, irrigation, general duty | Controlled drip lubricates the shaft; cheapest to own and re-packs in minutes on site |
| Mechanical seal | Drinking water, chemicals, zero-leak duties | Single or double cartridge seal; API 682 flush plans on request |
| Dynamic / glandless seal | Hot-water circulation & high-temperature builds | Hydraulic back-run seal — no packing to maintain, no flush water consumed |
Liquid enters through the suction bell into the first impeller. Each impeller throws it outward into its diffuser bowl, whose vanes convert velocity into pressure and hand the flow up to the next stage. Because the stages are in series, head adds stage by stage while flow stays constant — which is how a 200 mm well yields 300 m of head, and why a vertical multistage well pump needs no priming: the bowls sit below the water level. Below the bowls a suction bell and strainer steady the inlet; above them the stuffing box or mechanical seal keeps the discharge head dry — a self-priming centrifugal pump that multiplies head simply by adding stages.
The same platform carries three hydraulics. Radial impellers for high head, moderate flow (deep wells). Mixed flow for the middle — our ZHH chemical mixed flow pump hydraulics are CFD-optimized for stable, high-efficiency curves. Axial propellers for very large flow at low head: salt works, circulating and drainage duties with flow to 8,000 m³/h at 180–1,450 rpm.
Impeller vanes are trimmed and the diffuser passage matched at design stage, so the warranty point sits inside the flat, high-efficiency zone — not on a steep knee where vibration and radial loads grow.
Vertical turbine pumps are chosen from the wet end up: hydraulic first, then stages, shaft and column length, then driver and settings. Get these five in order and the pump will run for decades. Selection starts with the well or sump data — bore diameter, static and pumping level, sand content, power supply — and ends with the sealing and discharge-head options. The same discipline covers deep well turbine pumps, vertical sump pumps and NFPA 20 fire packages alike.
Flow and total head from well drawdown or system curve — never from nameplate guesses. Add friction for column and discharge losses at your setting depth.
Radial for deep wells, mixed flow for transfer and circulation, axial for large flow at low head (check the coverage map above).
Divide head by per-stage head, then round up to a tested stage count. More stages = more head, same flow.
Setting depth against the pumping water level; open line shaft for clean water, enclosed tube for sandy or corrosive service.
VHS motor for classic deep-well duty, VSS with thrust block for big power, diesel right-angle for off-grid — and listed NFPA 20 packages for vertical turbine fire pump duty.
| Duty window | Q (m³/h) | H (m) | Speed (rpm) | Typical build |
|---|---|---|---|---|
| Deep well water supply | 5–1,200 | 20–450 | 1,450 / 2,900 | Radial bowls, VHS motor, open or enclosed line shaft |
| Municipal & irrigation transfer | 200–5,000 | 5–120 | 980–1,480 | Mixed-flow bowls, VHS / VSS, sump or can setting |
| Condenser / cooling circulation | 1,000–12,000 | 8–45 | 490–980 | Can-type or concrete volutes, VSS with thrust block |
| Axial / mixed ZLH (brine, salt) | 300–8,000 | 1–300 | 180–1,450 | Adjustable axial impeller, corrosion alloys, 0–50 °C |
| Fire protection NFPA 20 | per listed curve | per listed curve | 2,900 / 1,750 | Vertical turbine fire pump, electric + diesel backup, jockey pump, controller |
| Long-shaft sewage / slurry | 50–2,000 | 5–60 | 980–1,480 | Open impellers, CLW-II long shaft, wear materials |
Windows are indicative — every enquiry is re-checked against your well log / sump drawing and NPSH before quotation.
The classic shortlisting question. Vertical line shaft pumps keep the motor dry above ground; submersible turbine pumps sink everything into the well; horizontal pumps need a flooded suction. Here is how they trade off. For most deep wells the vertical turbine pump wins on serviceability and fire compliance; for very deep or crooked boreholes the submersible turbine pump is hard to beat; inside a plant with a flooded suction, horizontal remains the cheapest. Sand content and maintenance access usually decide the rest.
Why engineers keep specifying line shaft: self-priming by geometry (bowls below water level) · motor and seal serviced at grade · impellers adjustable from the top without dismantling · decades of service life with replaceable wear parts · proven to NFPA 20 for fire duty.
| Criterion | Vertical turbine (line shaft) | Submersible turbine pump | Horizontal centrifugal |
|---|---|---|---|
| Motor location | Dry, at grade on the discharge head | Submerged, below the bowls | Dry, at grade beside the pump |
| Suction | Self-priming — bowls below water level | Self-priming, always submerged | Needs flooded suction or priming |
| Practical setting depth | To ~100+ m (column limited) | To 300+ m (cable limited) | Below-grade suction required |
| Head capability | Very high (multi-stage bowls) | High per unit diameter | High, but needs priming aids |
| Floor space | Minimal — one bore through the floor | None above grade | Largest footprint + pipe sweep |
| Shaft sealing | Packing or mechanical, accessible | Wet-rotor, no external seal | Mechanical seal, accessible |
| Inspection & repair | Motor serviced at grade; bowls pulled on trigger | Pull the whole string; motor shop work | Easy in-situ overhaul |
| Sandy well tolerance | Good with enclosed line shaft + open impellers | Sand kills wet motors fast | Poor without pre-filtration |
| Well / sump alignment | Needs a plumb well up to setting depth | Tolerates crooked boreholes better | Not applicable (surface mount) |
| Fire duty (NFPA 20) | Standard choice for fire water wells & sumps | Not listed for fire service | Only with positive suction |
| Typical duty | Deep wells, irrigation, fire, can sumps | Narrow wells, rural supply | Plant transfer with NPSH margin |
Rule of thumb: clean deep well + high head → vertical turbine pump; very narrow borehole → submersible; flooded suction inside a plant → horizontal; fire water from a well or sump → vertical turbine fire pump to NFPA 20. Still unsure — send us the well log and we will size both options with a cost comparison. New to the technology? Start with our guide: What is a vertical turbine pump?
Well water is never just water: sand, chlorides, CO₂, H₂S and scaling ions each point to a different metallurgy. As standard we quote in cast iron / bronze-fit; the table shows upgrade paths we machine every week. Column pipe, line shaft, bearings and fasteners follow the same logic — so a brine vertical mixed flow pump and a sandy-well deep well turbine pump may share hydraulics but ship in very different alloys.
| Component | Standard duty | Corrosive (chlorides, brine) | Abrasive (sand, slurry) | Severe (acid, high-T) |
|---|---|---|---|---|
| Bowls & discharge case | Cast iron / Ni-Resist | SS304 → SS316L → 904L | High-chrome iron | Duplex 2205 / 2507, Hastelloy, titanium |
| Impellers | Cast iron, bronze-fit | Bronze, SS316 | SS420 hardened / high-chrome | CD4MCu, 2507, Monel |
| Line shaft | Carbon steel | SS416 / SS431 sleeved | SS420 with enclosed tube | 2205 / SS316 heavy wall |
| Column pipe | Carbon steel (epoxy lined) | SS304 / SS316L | CS + ceramic-coated ID | Duplex, 904L |
| Shaft bearings | Fluted rubber (water-lubed) | SS shell + rubber / PTFE | Oil-lubed enclosed tube | Carbide / PEEK composites |
| Fasteners & sleeves | Zinc-plated steel | SS316 | SS316 + protectors | Monel / 2507 |
Also machined on request: 904L, CD4MCu, 2205, 2507, titanium, Ni-Resist grades 1–3 and Hastelloy C — the same alloy list we run for our chemical vertical axial/mixed flow ZLH pumps.
Anywhere water sits below grade or below floor level and must be lifted reliably, at volume, for decades: municipal water supply and drainage, farm and ranch irrigation, power plant condenser cooling, desalination intakes, mine dewatering, NFPA 20 vertical turbine fire pump service, and brine circulation in salt and chemical works. Wherever a vertical line shaft pump or vertical sump pump can lift from below, we have a build that fits.
Every vertical turbine pump is assembled complete — bowls, column, head and driver — then run at the duty point on our test stand. Impeller run-out, shaft straightness and stage clearances are logged; the test report ships with the pump. Hydrostatic tests, dynamic balancing and witness runs to ISO 2548 / ISO 9906 are available for export orders, and every vertical turbine fire pump is witness-tested on the full listed curve before it leaves the works.
| Service item | Interval | What we check / deliver |
|---|---|---|
| Impeller adjustment | At commissioning & after first 100 h | Top-of-motor clutch setting against bowl seals — no dismantling needed on VHS builds |
| Line shaft bearings | Inspect annually | Fluted rubber bearing wear; enclosed-tube oil level and flush flow |
| Stuffing box / seal | Monthly visual | Drip rate, gland temperature; mechanical seal flush plan check |
| Non-reverse ratchet | Every start-up season | Free ratcheting on stop; prevents back-spin from column drain-back |
| Well / sump survey | After drawdown changes | Re-check pumping level, NPSH and sand content before re-staging |
| Quarterly checks | Every 3 months | Stuffing-box drip rate, gland temperature, vibration trend, motor current balance |
| Annual overhaul | Yearly | Line-shaft bearing condition, coupling alignment, non-reverse ratchet, impeller setting re-trim |
| Wearing parts | As consumed | Bearings, shaft sleeves, impeller hubs, bowl wear-rings — standard spares stocked for the full range |
| Symptom | Likely cause | First action |
|---|---|---|
| Flow / head below curve | Impeller setting drifted; worn bowl wear-rings; column joint leaking | Re-trim impellers from the top; inspect wear-rings; pressure-test column |
| Excessive vibration | Worn line-shaft bearings; bent shaft section; loose base | Check run-out at the head; replace fluted rubber bearings; straighten or swap the shaft |
| Sand in the discharge | Pumping level dropped into a sand stratum; well developing | Survey the pumping level; convert to enclosed tube + open impellers |
| Motor overloads | Impellers set too tight; duty point off curve; wrong rotation | Raise impeller setting; verify duty point against the curve; confirm rotation |
| Back-spins on stop | Faulty non-reverse ratchet; column drain-back | Service the ratchet; check foot valve / column check valve |
Assembly, testing and installation footage. Each clip plays inline when you click the cover — the player is loaded from YouTube on demand. Watch a bowl assembly stacked stage by stage, a factory performance test against the quoted curve, and an NFPA 20 vertical turbine fire pump package in service — the same procedures our inspectors run on every order.
ⓘ The players stream from youtube.com. If your network blocks YouTube and the window stays blank, open the three direct links above — each card links straight to the video.
Tell us flow, head, setting depth and liquid — or just share the site data you have. Our engineers reply with a sized vertical turbine pump proposal, performance curve and quotation, typically within a few working days.