Choosing a chemical process pump starts with matching flow output to your piping and fluid. The Durco Flowserve MK3 STD and the Goulds 3196LF are both ANSI-style process pumps, but they target different jobs. One is a broader-duty chemical pump with DCI construction and a 250 PSI pressure rating; the other is a low-flow machine with 316SS wetted parts and a stuffing box built for packing or seal upgrades. The decision comes down to your flow rate, fluid chemistry, and how much uncertainty you can accept. This head-to-head walks through the configurations, listed prices, and the service each pump fits best.
Quick Verdict
For low-flow chemical or high-purity service, the Goulds 3196LF takes the edge with its stainless wetted parts and new condition. For a larger chemical process pump at a lower listed price, the Durco Flowserve MK3 STD is the lower-priced pick. The catch is that the MK3 is an open-box surplus unit, while the Goulds is brand new.
If you're open to surplus equipment, the MK3's lower listed price gets you a 315-pound pump with a wide casing, but it's from 2018 and sold without a test run. The Goulds' higher price buys new-condition certainty and a purpose-built low-flow design.
Side-by-Side
| Product | Listed price | Configuration | Condition | Key details |
|---|---|---|---|---|
| Durco Flowserve MK3 STD | USD 2,750.00 | 3" x 2" | New - Open box | DCI construction; 250 PSI @ 100°F |
| Goulds 3196LF | USD 3,825.00 | 1" x 1.5" x 8" | New | 316SS wetted parts; big bore stuffing box |
Where Each Product Wins
Durco Flowserve MK3 STD wins if your priority is a larger casing and a lower purchase price. The DCI construction and 250 PSI rating give it a broad chemical process profile. Goulds 3196LF wins if you need 316SS wetted parts and a low-flow hydraulic fit. The big bore stuffing box and new condition make it the more straightforward choice for packing or seal upgrades.
Product Notes
Durco Flowserve MK3 STD
The Durco Flowserve MK3 STD is a 3" x 2" chemical process pump with DCI construction and a 250 PSI rating at 100°F. It's a 315-pound unit, which gives you a sense of its industrial build. It is listed below the Goulds, and the wider casing supports higher flow. That makes it an appealing pick when your priority is getting a larger process pump for less. The main limitation is condition: it's a 2018 surplus unit sold as new open-box, and the seller notes there is no way to test it. The listing includes only what appears in the pictures, with money back if dead on arrival.
Goulds 3196LF
The Goulds 3196LF is built for low-flow ANSI process duty. Its 1" x 1.5" x 8" configuration and 316SS volute, impeller, shaft, and all wetted parts make it a strong candidate for corrosive chemicals and high-purity applications. The big bore stuffing box is a real plus if you intend to run packing or switch to a different seal. It's brand new and made in the United States. The flip side is price: the listed cost is higher, and the low-flow design means it won't cover the same higher-volume territory as the Flowserve MK3. For a focused low-flow line, the material spec and new condition make it a straightforward choice.
Final Choice by Use Case
Choose the Goulds 3196LF when your line runs at low flow rates and corrosion resistance matters. Choose the Durco Flowserve MK3 STD when you need a larger casing and your budget is better served by a surplus/open-box pump. The MK3 gets you there for less; the Goulds gets you a new low-flow pump with the material spec to match the job.
