Alfa Laval GJ 4

Alfa Laval's largest automated tank cleaner, the GJ 4 tank cleaning machine, is designed to clean tanks with diameters of over 15 feet. The GJ 4 is a hydraulically driven rotary tank cleaning machine that revolves 360° in both horizontal and vertical planes. Synchronized solid jets provide a tight and thorough scouring pattern covering all interior tank surfaces in one complete cycle.

The Alfa Laval GJ 4 is available in stainless steel, with a choice of oil-lubricated or flow-thru (wash fluid lubricated) gearboxes. Gear trains are designed to maximize wear life, which offers improved reliability and reduced downtime.

With a choice of twelve nozzle sizes, various hydraulic turbines and stators, along with two gear systems, the GJ 4 offers a wide operating range of flow rates, nozzle rotation speeds, and wash cycles. The Alfa Laval GJ 4 is fully capable of high-concentration chemical recirculation cleaning or high-pressure, low-volume water jet scrubbing in fixed clean-in-place (CIP) automated systems.


The Alfa Laval GJ 4 is part of the world-renowned Gamajet range of high impact tank cleaning devices. The device provides high-impact cleaning for large-sized tanks with diameters over 15 feet. The Alfa Laval GJ 4 is designed to remove the toughest residues from large tanks in numerous industries and is customizable in a wide variety of ways. The Alfa Laval GJ 4 allows companies to spend less time cleaning and more time producing.

Working Principle

The Gamajet range of high impact tank cleaning devices combine pressure and flow to create high impact cleaning jets. Cleaning occurs at the point at which the concentrated stream impacts the surface. This impact, and the tangential force that radiates from that point, blasts contaminants from the surface, scouring the tank interior. In conjunction with this impact, the device is engineered to rotate in a precise, repeatable, and reliable 360° pattern. This full-coverage, global indexing pattern ensures the entire tank interior is cleaned, every time.


The choice of nozzle diameters can optimize jet impact length and flow rate at the desired pressure. As standard documentation, the Alfa Laval GJ 4 can be supplied with a “Declaration of Conformity” for material specifications.


Electronic rotation sensor to verify 3-D coverage. 180° and 105° directional versions are available.

Caution: Do not use for gas evacuation or air dispersion.

Cleaning Pattern
Cleaning Pattern
The graphics above demonstrate the cleaning pattern achieved on a cylindrical horizontal vessel. The difference between the first cycle and the full pattern represents the number of additional cycles available to increase the density of the cleaning.
Technical Data
Throw Length (max) 100 ft
Working Pressure 40 - 300 psi
Recommended Pressure 50 - 200 psi
Working Temperature (max) 203°F
Ambient Temperature (max) 284°F
Lubricant Food grade
Weight 28 - 29 lb
Connections 2 inch NPT, 2 inch BSP
Materials 316L, PTFE, FKM (EPDM and FFKM available)
2.1 material certificate
Dimensional Data
A (in)12.13
B (in)5.15
C (in)13.03
D (in)2.99
E (in)6.10
F (in)13.03
G (in)14.65
H (in)6.61
I (in)8.62
2 inch Female (NPT)/ 2.5 inch camlock, 2 inch Female (BSP)/ 2.5 inch NST
2 inch Female (NPT)/ 2.5 inch camlock, 2 inch Female (BSP)/ 2.5 inch NST

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