Viking Pump’s latest generation of internal gear pumps (sizes H-QS in steel and stainless steel) brings a wide range of benefits that previous alloy pumps couldn’t offer, especially in terms of porting flexibility. These new pumps have reduced the number of casing configurations, which helps lower manufacturing complexity, costs, and lead times while simultaneously increasing the number of port options and providing greater flexibility in porting.
Because Viking pumps can handle a broad range of viscosities, users have expressed a need for smaller ports for low-viscosity liquids to cut down on piping costs, or larger ports for high-viscosity liquids to reduce friction losses and power requirements. This meant that each pump size had to accommodate multiple port sizes, as well as different global standards and pressure/temperature ratings.
One of the main reasons for the numerous casing configurations in the past was that the ports were integrally cast into the casing, meaning every pump size required unique casings for each port size, standard, and rating option. This resulted in a large number of casings to meet all global needs.
The introduction of the ProPort™ casing is a major change, as it uses bolt-on instead of cast-in ports. This innovation has drastically reduced the number of unique casings from 372 to just 14. That’s a significant reduction—going from 372 unique casings to 14. This enables distributors to inventory a range of sizes with the ability to quickly switch ports to meet their customers' unique piping arrangements.
For example, the new K and KK size pumps now feature bolt-on 2†NPT ports; ANSI-compatible Class 150 raised-face flanges in 2â€, 2-1/2â€, 3â€, and 4†sizes; Class 300 in 2â€, 2-1/2â€, and 3†sizes; as well as DIN 50, 65, and 80 PN16 ports. So instead of many casings, one casing, used on both K and KK sizes, offers 11 bolt-on port options, with internal porting sized to accommodate the largest available port.
Here is a table showing the available port options:
| Port Options (Inches) | Pump Sizes |
|-----------------------------|------------|
| 1.5" NPT | S, S |
| 2" NPT | ✔, ✔ |
| 1.5" Class 150 | ✔, ✔ |
| 1.5" Class 300 | ✔, ✔ |
| 2" Class 150 | ✔, ✔ |
| 2" Class 300 | ✔, ✔ |
| 2.5" Class 150 | ✔, ✔ |
| 2.5" Class 300 | ✔, ✔ |
| 3" Class 150 | ✔, ✔ |
| 3" Class 300 | ✔, ✔ |
| 4" Class 150 | ✔, ✔ |
| 4" Class 300 | ✔, ✔ |
| 6" Class 150 | ✔, S |
| 6" Class 300 | ✔, ✔ |
| DIN 32 PN16 | ✔, ✔ |
| DIN 40 PN16 | ✔, ✔ |
| DIN 50 PN16 | ✔, ✔ |
| DIN 65 PN16 | ✔, ✔ |
| DIN 80 PN16 | ✔, ✔ |
| DIN 100 PN16 | ✔, ✔ |
| DIN 150 PN16 | ✔, ✔ |
* = Available Port Option
S = Standard Porting
Ⓡ = Flanges designed with a Raised Face
â‘ = Suitable for use with Class 150 steel or stainless steel companion flanges or flanged fittings
â‘¡ = Suitable for use with Class 300 steel or stainless steel companion flanges or flanged fittings
Fig. 1 - Port Options for ProPortâ„¢ Casings
Key Benefits of ProPortâ„¢ Casings:
- The removable NPT threaded ports on H-L size pumps eliminate the need for unions in the suction and discharge lines.
- Since all ports can be re-used, if a replacement pump is needed, it can be ordered with fewer ports to further reduce cost.
- Bolt-on ports can be sealed by gaskets or O-rings and are designed and tested to ensure nozzle load ratings exceed ASME, DIN, and other global standards.
- Distributors can provide enlarged suction ports to minimize friction losses that decrease NPSHa and can cause cavitation, while using smaller-sized discharge ports to keep piping costs low.
Additionally, Viking pumps are known for mostly having 90Ⱐports, usually to enable side suction, top discharge piping, and to pump to overhead lines, though casings are rotatable for other arrangements. Some customers desired more opposite port options, and while some opposite port models were available, they often came with longer lead times and higher prices. Remarkably, in reducing the number of casings from 372 to 14, Viking Pump actually added opposite port models in all sizes, H through QS, with capacities ranging from 30 to 500 GPM or 3.5 to 114 m³/hr. That's 26 times fewer casings, with more customer-focused options! And the new casings are completely retrofittable onto existing Viking pumps.
Fig. 2 - HL 227C with Opposite Ports
More Features in Every Casing:
First, Viking Pump’s alloy pumps had long used gaskets to seal the bracket and head to the casing, since gaskets were compatible with almost every liquid and simplified product selection. Some customers preferred O-ring seals, however, which meant machining special grooves at higher cost and longer lead time. The new ProPort™ casings are gasketed but also have O-ring grooves standard to enable static O-ring seals if required.
Second, casing drains were formerly optional and added cost and lead time, but are now standard, enabling near-complete draining before removing a pump for maintenance. This enhances operator safety and minimizes any spilled liquid on site.
And finally, some customers required custom-machined flush and/or suckback grooves to promote a small amount of flow behind the rotor, to prevent materials like latex or chocolate from setting up there. The new casings feature drilled holes from the suction and discharge ports to the area behind the rotor, plugged with removable setscrews as standard, to allow users to experiment with the best combination of flush and/or suckback if needed.
If the ProPort™ casings weren’t amazing enough, check out the Modular Pump Overview blog and the upcoming blog on the U-Plus™ modular brackets and the sealing flexibility they provide!
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