Hydrochloric
Acid

Wilfley Heavy Duty Centrifugal Pumps Pump Hydrochloric Acid

Proper material selection is crucial for the highly corrosive pumping applications found in hydrochloric acid pickling applications


Robust, Corrosion Resistance

Metallic materials tend to corrode or revert back to a more stable oxidized state over time and more readily in aggressive environments. Choosing the most suitable material is a complex science, especially in variable temperature, compound or contaminated solutions. In particular, hydrochloric acid, often used in pickling applications in steel production, can especially be problematic for metal pumps and equipment.

Wilfley’s metal expertise and success is well established. However, we also offer extremely heavy-duty pumps designed with non-metallic wetted parts for aggressive acids and similar chemicals. In one recent example, Wilfley’s thermoset lined chemical process pumps saved a major mining customer 75% initial costs and over 1000% longer productivity cycles when compared to a comparable high alloy metallic design.

Material Tensile
Strength
Tensile
Modulus
Flexural
Strength
Flexural
Modulus
CPS 21,000 psi
(145 MPa)
2,300,000 psi
(15,858 MPa)
32,000 psi
(221 MPa)
1,950,000 psi
(13,445 MPa)
Kynar® 6,000 psi
(41 MPa)
175,000 psi
(1,207 MPa)
8,000 psi
(55 MPa)
230,000 psi
(1,586 MPa)
Tefzel® 6,500 psi
(45 MPa)
1,900,000 psi
(13,100 MPa)
10,000 psi
(69 MPa)
1,300,000 psi
(8,963 MPa)
W35 19,700 psi
(136 MPa)
1,190,000 psi
(8,205 MPa)
27,200 psi
(188 MPa)
990,000 psi
(6,826 MPa)

Abuse Tolerant Seals

Pumping water in a controlled environment (such as a manufacturing test lab) is as easy as it gets. But pumping an acidic slurry non-stop, with variable and upset conditions with maximum uptime is another matter – but that is exactly where Wilfley shines.

A common scenario that can trigger a Lost Productivity Failure (LPF) in centrifugal pumps is loss of prime. This can occur in any industrial system, but more often in tanker/rail car off-loading applications. As a constant liquid supply is lost, the pumpage shifts to a two phase fluid (liquid and air) and flow drops to zero. Both conditions subject the rotating assembly of a centrifugal pump to abnormal loads and subsequently high vibration. The mechanical stress can be transmitted to brittle traditional seal faces with almost immediate consequences, even for double mechanical seal systems.

By contrast, Wilfley Sealing Technology separates the faces during operation, isolating detrimental mechanical vibration. Further, the allowable clearances are increased by over 270% when compared to mechanical seal requirements, allowing significantly more tolerance – all with fully isolated, full diameter shafting.


Running Dry Is No Longer a Problem

Traditional sealing technologies (or even newer magnetic drive systems) require constant thermal moderation of the primary seal or journal bearing surfaces in order to operate satisfactorily. Once the moderating liquid is lost or evacuated, the source of lubrication and ability to remove heat from these rubbing surfaces is also, and failure occurs – usually within minutes.

With Wilfley Sealing Technology, once the pump is operational the primary seal faces are separated and therefore do not require cooling via flushing. In fact, our governor-actuated static seals, such as the DryLock®, are designed to run dry (with separated faces) while the expeller manages all of the dynamic sealing requirements. By eliminating thermal stress induced by face tribology, the resultant failures of traditional sealing materials are also eliminated.


Contact us to learn more about our expertise in hydrochloric acid

Mark ScottHydrochloric Acid | Pumps