Choosing a centrifugal pump for an industrial flow control line usually comes down to more than just price. You need to match port size, pressure rating, material, and the overall package you're willing to wire into your system. These four pumps cover a wide range: two Flowserve MK3 chemical process pumps, a Goulds 3196 process centrifugal pump, and a Durco MK II. With prices from $1,167.60 to $5,750, the trade-offs are visible before you even get to the spec sheet.
Quick take
If your priority is a low entry price, the Goulds 3196-4X6-10G is the used option to look at first. For a compact chemical pump, the 1.5-inch x 1-inch Flowserve MK3 is the smallest new option in this group. If you need a larger 3-inch x 2-inch connection, the second Flowserve MK3 is the one to weigh. At the top of the range, the Durco MK II 4x3x10 is built for a larger stainless-steel process flow, though it comes without a motor or baseplate.
At a glance
| Product | Price | Bar | Notable detail |
|---|---|---|---|
| Flowserve MK3 1.5-in. x 1-in. | $3,750.00 | D4 material, 275 PSI @ 100°F | |
| Flowserve MK3 3-in. x 2-in. | $2,750.00 | DCI material, 250 PSI @ 100°F | |
| Goulds 3196-4X6-10G | $1,167.60 | Used, two-year coverage included | |
| Durco MK II 4x3x10 | $5,750.00 | 316SS, 8.750-in. impeller, pump only |
Which pump matches your situation?
- For a compact chemical transfer line: the Flowserve MK3 1.5-in. x 1-in.
- For a larger 3-in. x 2-in. chemical hookup: the Flowserve MK3 3-in. x 2-in.
- For a lower-cost used process pump: the Goulds 3196-4X6-10G.
- For a stainless-steel process pump: the Durco MK II 4x3x10.
Product notes
Flowserve MK3 1.5-in. x 1-in. Chemical Process Pump (D4)
The 1.5-in. x 1-in. Flowserve MK3 STD D4 is the smaller-port chemical pump in this group at $3,750. It carries a 275 PSI rating at 100°F, so it suits a flow control line that needs that pressure capability in a compact footprint. It is a new open box surplus unit with a 2015 date. The trade-off: this is a specific size (1.5-in. suction, 1-in. discharge), so it's not the pump to choose if your piping already expects a 3-in. x 2-in. connection. No testing is possible on this unit.
Flowserve MK3 3-in. x 2-in. Chemical Process Pump (DCI)
If the 1.5-in. x 1-in. port size is too small, the 3-in. x 2-in. Flowserve MK3 STD DCI at $2,750 offers a larger suction/discharge pairing and a 250 PSI rating at 100°F. This new open box surplus unit has a 2018 date, which makes it the more recent of the two MK3 pumps. The larger 3-in. x 2-in. connection and the lower price than the smaller MK3 make it an option for process lines that can use the bigger ports. The pressure rating is 25 PSI lower than the 1.5-in. x 1-in. MK3, and the material is DCI rather than D4, so chemical compatibility is the main thing to confirm before committing.
Goulds Pump 3196-4X6-10G -FRAME Process Centrifugal Pump
At $1,167.60, the Goulds 3196-4X6-10G -FRAME is the lowest-priced pump in this comparison. It is used, and the purchase price includes two-year coverage. If your priority is keeping the upfront number down and you're comfortable with used process equipment, this is the pump to weigh. The size notation 4x6-10G points to a larger unit than the 1.5-in. x 1-in. and 3-in. x 2-in. Flowserve pumps, so it belongs to a different footprint class. The used condition is the key limitation; the two-year coverage helps offset some of that uncertainty, but you'll still need to judge the unit against your process.
Durco MK II 4x3x10 Centrifugal Pump (316SS)
The Durco MK II 4x3x10 is the highest-priced pump at $5,750. It uses 316SS construction and an 8.750-inch impeller with clockwise rotation, which points it at a stainless-steel process stream that needs a larger 4x3x10 configuration. It comes as pump only, so no motor or baseplate is included and you'll need to supply those separately. The large size puts it in a different class from the 1.5-in. x 1-in. and 3-in. x 2-in. MK3 pumps, and the impeller size and rotation are specific specs you need to match to the rest of the drivetrain. In short, you're paying for a bigger, corrosion-resistant package and then completing it yourself.
Final recommendation by use case
- If your line is built around a compact chemical transfer point, the Flowserve MK3 1.5-in. x 1-in. is the pairing to check.
- If a 3-in. x 2-in. connection matters more than a higher pressure number, the Flowserve MK3 3-in. x 2-in. covers that need and leaves budget headroom.
- If you want the lowest upfront price and can work with used equipment, the Goulds 3196-4X6-10G brings the 4x6-10 size into play.
- If a stainless-steel process stream and a large 4x3x10 configuration are non-negotiable, the Durco MK II is the pump to build around, knowing the motor and baseplate are not included.
