Mag-Drive Pump Approved Equal Comparison
Finish Thompson ULTRAChem® UCR/UCP vs. Richter-CT MNK/QMD — sealless magnetic-drive centrifugal pumps compared on the requirements that actually decide a substitution: containment can material, dry-run bearing protection, and temperature/pressure envelope, not just flow and head.
30+ years spec experience. Send James your basis-of-design mag-drive pump and proposed alternate — get a real bearing/can/pressure match, not a catalog guess.
Request a Spec Review →Sealless magnetic-drive centrifugal pump specs get written around one manufacturer's exact model far more often than most bidders realize, because the "no dynamic seal to leak" pitch reads the same across vendors even when the underlying engineering doesn't match line for line. A real substitution request has to go past the flow/head curve into the containment can technology, the dry-run bearing protection, and the certification stack — this page walks through both real comparisons LibertyCES has the underlying vendor data for.
Finish Thompson UCR vs. Richter-CT MNK Heavy Duty
Both are the top-of-line sealless mag-drive family from their respective manufacturers — ANSI-dimensional metal casing (UCR) vs. ISO/ASME-flanged frame-mounted or close-coupled construction (MNK) — each explicitly marketed for the most demanding chemical service in their own product line.
| Requirement | Basis of Design — Finish Thompson UCR | LibertyCES Alternate — Richter-CT MNK | Same / Different | Notes |
|---|---|---|---|---|
| Sealing design | Finish Thompson UCR — sealless, magnetically driven, ANSI/ASME B73.1m & 73.3 dimensional | Richter-CT MNK Heavy Duty — sealless, magnetically driven, ISO 7005-2 / ASME B16.5 flanged | Same | Both are true sealless mag-drive centrifugals, not mechanically sealed pumps with a mag-drive dressed up as a substitute — the core substitution premise (no dynamic shaft seal to leak) holds on both sides. |
| Containment shell (can) material | UCR: ductile iron housing with pure, unfilled ETFE lining and barrier liner, magnets molded into the liner | MNK: eddy-current-free composite can — CFRP/PTFE, explicitly designed to avoid the eddy-current heating losses a metal can generates | Different (real engineering distinction) | This is a genuine mechanism-level difference, not a paperwork one. A metal barrier can (more common in ANSI mag-drive pumps generally) loses some drive energy to eddy currents; Richter's composite can avoids that loss. Neither design is wrong — UCR's ETFE-lined metal housing is proven at 300 psi/250°F — but a substitution request should name which barrier-can technology is being proposed, since it affects both efficiency and the pump's general wear/leak-path profile. |
| Max working pressure | 300 psi (20.7 bar) | PN16 (≈232 psi / 16 bar) | Different | UCR's ANSI-dimensional rating tops out higher than MNK's PN16 nominal rating. Confirm the actual process pressure falls inside whichever envelope is being proposed — do not assume PN16 covers a 300 psi spec point. |
| Max temperature | 250°F (121°C) — ETFE lining | -60°C to +200°C (-80°F to +400°F) — PFA/PTFE/PFA-conductive lining options | Different (alternate exceeds on the high and low end) | MNK's published range is wider on both ends — real capability difference in the alternate's favor, worth disclosing rather than treating as a wash. |
| Bearing / dry-run protection | Fully supported shaft, dual bushings (material not itemized in this capture at the UCR-family level) | SAFEGLIDE® PLUS dry-running-optimized plain bearings, pure SSiC or SSiC/SAFEGLIDE PLUS | Unverified | Dry-run/bearing protection is exactly the kind of named functional requirement a mag-drive spec calls out — do not claim parity here without pulling UCR's current bearing-material data sheet to compare directly against Richter's SSiC bearing spec. |
| Magnet material | Not itemized in this capture at the UCR-family level | SmCo (samarium cobalt) and NdFeB (neodymium iron boron) permanent magnets — named explicitly | Unverified | Richter names its magnet chemistry explicitly; this capture does not have the equivalent UCR data point yet. Confirm before treating magnet coupling strength/temperature rating as matched. |
| Flow / head envelope | 1-1,450 gpm (0.3-329 m³/hr), max head up to 492 ft (150 m) | MNK size range 25-25-100 through 200-150-315 (metric); imperial MNKA 1.5"x1"x6" through 6"x4"x13" — flow/head not itemized at the family level in this capture | Unverified | Match the specific model size, not just the family name — confirm the actual duty point against Richter's model-specific curve, not inferred from UCR's family-wide range. |
| Certifications | CE/UKCA/ATEX (2014/34/EU) | CE/UKCA, certified to 2006/42/EC (Machinery Directive) and 2014/34/EU (ATEX) | Same | Both carry ATEX certification for explosive-atmosphere service — a real, matched functional requirement if the spec calls for it. |
Sources: Finish Thompson ULTRAChem UCR Series product/spec pages and curve book; Richter Chemie-Technik Centrifugal Magnetic Drive Pumps product pages (MNK family).
Finish Thompson UCP vs. Richter-CT QMD Standard Duty
Both manufacturers independently position these as their economical sealless mag-drive tier — a genuine like-for-like market position, though the underlying liner chemistry and certification stack are not identical.
| Requirement | Basis of Design — Finish Thompson UCP | LibertyCES Alternate — Richter-CT QMD | Same / Different | Notes |
|---|---|---|---|---|
| Sealing design | Finish Thompson UCP — sealless, magnetically driven, ANSI/ASME B73.1m & 73.3 dimensional, lower-cost tier vs. UCR | Richter-CT QMD Standard Duty — sealless, magnetically driven, positioned explicitly as the economical/standard-duty tier vs. MNK/RM | Same | Both vendors independently position these as their value-tier sealless offering within their own product lines — a genuine like-for-like market position, not just a coincidence of price. |
| Containment liner material | Magnets fully encapsulated in pure, unfilled polypropylene; barrier is glass-filled polypropylene liner with carbon-fiber-reinforced exterior shell | FEP lining — the only Richter family using FEP rather than PFA/PTFE | Different | Polypropylene (UCP) and FEP (QMD) are chemically distinct liner materials with different chemical-resistance and temperature ceilings. A substitution request must check the actual process chemical against each material's own compatibility rating — do not assume "both are the lower-cost plastic-lined option" makes them chemically interchangeable. |
| Max temperature | 180°F (82°C) | -10°C to +100°C (14°F to +210°F) | Different | QMD's published ceiling (100°C / 212°F) is higher than UCP's 180°F (82°C) — a real capability difference to flag even though QMD is Richter's "standard duty" tier. |
| Max working pressure | 300 psi (21 bar) | PN16 (≈232 psi / 16 bar) | Different | Same pattern as the UCR/MNK comparison above — confirm actual process pressure against the PN16 rating before assuming parity. |
| PTFE ring / bearing detail | PTFE ring locks impeller bushings against movement from temperature cycling | Plain bearings pure SSiC or SSiC SAFEGLIDE PLUS, magnetic drive size 20 Nm | Different construction, same intent | Both are addressing bearing/impeller stability under thermal or mechanical stress, but through different specific mechanisms — worth naming both approaches rather than treating one spec line as auto-satisfying the other. |
| ATEX certification | CE/UKCA — no ATEX listed for UCP, unlike UCR | Certified to 2014/34/EU (ATEX) alongside 2006/42/EC | Different (alternate has broader certification) | If the spec requires ATEX/explosive-atmosphere certification, UCP does not carry it in this capture — QMD does. This is exactly the kind of named certification gap that can sink a substitution request if it goes unstated. |
Sources: Finish Thompson ULTRAChem UCP Series product/spec pages and curve book; Richter Chemie-Technik Centrifugal Magnetic Drive Pumps product pages (QMD family).
Mag-Drive Pump Substitution FAQ
Is a sealless mag-drive pump substitution as simple as matching flow and head?
No — flow and head are necessary but not sufficient. A genuine mag-drive substitution comparison also has to match dry-run/bearing protection (what happens if the pump runs briefly without fluid), the containment can or barrier material (the layer separating the wetted inner rotor from the dry outer drive magnet), and the magnet coupling's temperature/decoupling limits. Two pumps can post identical flow/head curves and still behave very differently under a dry-run upset or a hot-chemical excursion.
What is a containment can, and why does its material matter in a substitution request?
The containment can (sometimes called a barrier can or shell) is the thin non-magnetic wall that isolates the pump's wetted inner magnet/impeller assembly from the dry outer drive magnet outside the pump casing — it is what makes a mag-drive pump sealless in the first place. Metal cans (common in ANSI-dimensional mag-drive pumps) can generate eddy-current losses as the drive magnet rotates past them; composite cans like Richter's CFRP/PTFE design are built specifically to avoid that loss. Neither approach is automatically wrong, but a substitution request should name which technology is being proposed, since it affects drive efficiency and, in some designs, the can's own pressure/temperature rating.
Does a lower-cost mag-drive tier (UCP or QMD) always mean a lower temperature or pressure rating?
Generally yes in this comparison, but not uniformly, and the exact numbers matter more than the "lower cost tier" label. Finish Thompson's UCP tops out at 180°F versus UCR's 250°F — consistent with UCP being the value tier. Richter's QMD, however, is rated to 100°C (212°F) even as their own stated standard-duty (economical) tier — actually higher than Finish Thompson's value-tier UCP. A substitution request should always pull the specific published number for the specific model, not assume "value tier" implies a specific temperature ceiling across vendors.
Why does ATEX certification matter for a mag-drive pump substitution specifically?
Magnetic coupling itself is a real, named ignition-risk consideration in hazardous-location service — friction or a decoupling event inside the magnetic drive can generate heat or sparking under fault conditions, which is why ATEX (2014/34/EU) certification is commonly called out by name in mag-drive pump specs for explosive-atmosphere areas. In this comparison, Finish Thompson's UCR and Richter's MNK/MPB/RM all carry ATEX; Finish Thompson's lower-cost UCP does not, while Richter's equivalent value-tier QMD does. That is a real, disclosable difference a substitution request needs to name explicitly if the basis-of-design spec requires ATEX certification.
Can a mag-drive pump safely handle chemicals that off-gas or contain some entrained gas?
It depends on the specific family, not on "mag-drive pumps" as a category. Richter's MPB (Peripheral Magnetic Drive) family is explicitly rated to self-prime without an additional suction tank and to safely pump liquids with up to 30% gas content — a real, distinct capability not shared by Richter's own other three centrifugal mag-drive families (MNK, QMD, RM), which are not gas-tolerant by design. If a substitution request involves an off-gassing chemical, confirm the specific alternate model's gas-handling rating rather than assuming any mag-drive centrifugal handles it.
Size it right before you buy
The Finish Thompson MSDB pump-review checklist: carbon-bushing run-dry limits, NPSH margin and the suction-piping rules that decide pump life.
Enter flow, head, SG and plant air. See the air pressure and SCFM your duty needs on a real FTI Air FT30P curve, then get the worksheet by email.
Preparing a mag-drive pump substitution request?
Send James the basis-of-design cut sheet and the manufacturer/model you want to propose — I’ll confirm the containment can, bearing, and pressure/temperature match against real, current factory data before it goes to the engineer of record.
Ready to buy or need a fast answer? Call, text, or email James directly — (559) 395-5500 · [email protected].