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JS 15

Sulzer submersible sludge pump JS 15

The submersible sludge pump JS 15 is excellent for pumping sludge and water mixed with solids. The pump has a slim design and low weight, which makes it easy to move and easy to handle. It can run without risk of overheating the motor or sludge clogging. 50 Hz: head max 15.5 meters, flow max 10 l/s. 60 Hz: head max 18.5 meters (61 feet), flow max 11 l/s (174 gpm).


Electric submersible pump.
Maximum submergence: 20 m. Protection class IP 68.
Max temperature of pumped medium at max power input and  continuous duty 40 ºC.
Max medium density 1100 kg/m3. pH of the pumped medium 5-8.  Free passage Ø 40 mm.
Max no. of starts 30/hour.
Max impeller diameter requires half motor or more submersed for continuous duty. (Pump can operate lying down.)

Electric motor

3-phase squirrel-cage induction motor, 50 Hz:

Service factor 1.1. Class F insulation.
Motor rating P2: 1.4 kW.
Speed: 2800 rpmD.O.L. start with built-in contactor.ŋ: 80.6 (50 %), 79.9 (75 %), 76.5 (100 % load)

Voltage, V 230 400 500
Nominal current, A 5.2 3.0 2.4



Power cable

20 m type H07RN8-F:
4 x 1.5 sq.mm. (3-phase)

Motor protection

Built-in thermal switches in the stator winding (140ºC, ±5).

Shaft seal

Double mechanical seal in oil bath.
Primary seal: Silicon carbide on silicon carbide.
Secondary seal: Silicon carbide on silicon carbide.


Upper bearing: Single-row deep groove ball bearing. 
Lower bearing: Single-row deep groove ball bearing.

Discharge connections

2", 2 ½", 3" (standard) hose connections.
2", 2 ½", 3" B.S.P. threaded connections.


20 kg (without cable)

Options and accessories

Zinc anodes. Surface protection coating.
Starter and control units. Floatation ring.
Repair kit. Discharge connection accessories and hose.


Description Material EN ASTM
Motor housing Aluminium EN 1706:AC-43100 ASTM AlSi10mg
Fasteners Stainless steel 10088:X5CrNi18-10 (1.4301) AISI 304
Rotor shaft Stainless steel 10088:X20Cr13 (1.4021) AISI 420
Volute / Impeller Nodular cast iron 1563:ENGJS-HB150 ASTM A536-80:60-40-18
O-rings Nitrile rubber