For sulfuric acid plants and chemical processing facilities currently operating the Lewis Pumps MSR-2458, ChemPumps offers a proven drop-in replacement, our High Temperature Concentrated Sulfuric Acid Submerged Pump, engineered to match the MSR-2458's dimensional footprint, material specification, and performance envelope.
Whether you need a direct spare, a capacity upgrade, or a cost-effective alternative to long OEM lead times, our pump delivers equivalent performance with immediate availability and full technical support.
Why Plants Switch from Lewis MSR-2458 to ChemPumps
The Lewis MSR-2458 is a well-established MSR-type gastight submerged pump, widely used in concentrated sulfuric acid service. However, procurement challenges, extended lead times, and rising OEM pricing have pushed many plants to evaluate compatible replacements.
ChemPumps has engineered a direct substitute that meets or exceeds the original specification, using the same Lewmet® Ni-Cr alloy metallurgy and Alloy 20 shaft construction that makes the MSR-2458 reliable in high-temperature acid service.
Performance Specifications: MSR-2458 vs. ChemPumps Replacement
Material Equivalence: Built with the Same Alloy Standard
The MSR-2458 relies on LEWMET Ni-Cr alloy for impellers and wear components, a proprietary alloy optimized for concentrated sulfuric acid at elevated temperatures. ChemPumps manufactures its own equivalent grades in-house:
Lewmet® 1# (B-11), HRC 42–52, for high-temperature concentrated H₂SO₄ and oleum
Lewmet® 2# (B-12, 904 equivalent), HRC 35–42, for shaft sleeves and bushings
Lewmet® 3# (B-13), HRC 20–26, corrosion rate <0.025 mm/a at 104°C
This means your replacement pump arrives with the same corrosion resistance and wear life you expect from the original, without OEM dependency.
Our full sulfuric acid pump range covers all concentration levels from 92% to 105% oleum service.
Gastight Design for Hazardous Acid Vapor Environments
Like the MSR-2458, our replacement uses a gastight construction, sealing the top of the pump to prevent sulfuric acid vapor escape into the plant environment. This is critical for:
Concentrated H₂SO₄ above 100°
COleum / fuming sulfuric acid service
Enclosed tank installations with vapor containment requirements
The deep stuffing box with graphited PTFE packing ensures zero fugitive emissions, matching the original Bulletin 326 specification of the Lewis MSR-2458.
Vertical Submerged Installation: Drop-In Compatibility
The MSR-type pump installs vertically through a tank cover plate, with the pump head submerged and the motor sitting above the mounting flange. Our replacement pump maintains the same:
Cover plate bolt pattern (14 holes, 7/8" diameter on standard spacing)
Discharge flange standard (DIN 250mm PN16 / EN 1092-1, 12 × 24mm studs, 355mm B.C.)
Motor mounting interface (standard ABB 280SMA frame compatible)
This allows direct installation into existing MSR-2458 footprints with no civil or structural modifications required.
For plants running multiple vertical acid pumps, explore our full range of vertical submerged sulfuric acid pumps designed for long-shaft, deep-tank installations.
Certifications & Quality Assurance
ChemPumps holds CE certification and API Spec Q1, the international petroleum and chemical industry quality standard. Every pump is factory-tested before shipment, with full material traceability and dimensional reports available on request.
We are a nationally recognized "Little Giant" enterprise and certified High-Tech company, with nearly 30 years of experience manufacturing special-purpose pumps for the world's most aggressive chemical environments.
Request a Direct Replacement Quote
If you are operating a Lewis MSR-2458 or similar MSR-type sulfuric acid submerged pump and need a replacement, our engineering team can review your existing datasheet and confirm full dimensional and hydraulic compatibility.
Contact ChemPumps for:
Drop-in
MSR-2458 replacement pumps
Custom submergence depth (J dimension)
Material upgrades for higher temperature or oleum service
Spare parts and wear c
omponent supply
View our full sulfuric acid pump range →