Large-Scale Magnetic Level Indicators: Engineering a 20-Foot Magnicator® for Tall Vessel Applications
- Mar 21, 2022
- 3 min read
Updated: Aug 6
Not all level indication challenges involve standard-sized vessels. Some applications — tall distillation columns, large storage tanks, extended process vessels — require level indicators that can span significant heights while maintaining accuracy and reliability across the entire range. A 20-foot Jerguson® Magnicator® shipped to a California plant illustrates how magnetic level indication scales to meet these demanding applications.
Why Tall Vessels Need Specialized Level Indication
The Engineering Challenge
As vessel height increases, level indication systems face compounding challenges:
Structural support: Long indicator assemblies need adequate support to prevent sagging or misalignment
Magnetic coupling consistency: The magnetic connection between float and external indicator must remain reliable across the entire length
Float travel distance: The float must move freely through the full range without binding
Chamber straightness: Any deviation in chamber alignment can affect float movement and readings
A 20-foot magnetic level indicator represents significant engineering beyond a standard 3-5 foot unit — it requires precise manufacturing tolerances maintained across a much longer assembly.
Why Choose Magnetic Level Indicators Over Sight Glasses for Large Applications
Improved Visibility Across Extended Range
On a tall vessel, a traditional sight glass gauge becomes increasingly difficult to read accurately across its full length, especially from a distance or at an angle. Magnetic level indicators use external indicator flags that provide clear, consistent visibility along the entire indication range.
Reduced Maintenance
Sight glasses require periodic blowdown, cleaning, and eventual glass replacement — and on a 20-foot unit, this maintenance burden multiplies with the extended length. Magnetic level indicators, with their sealed chamber design, require significantly less routine maintenance across their entire length.
Elimination of Leak Paths
This is the critical safety advantage for many applications. A sight glass design has sealing points at every glass segment along its length — each one a potential leak path. A magnetic level indicator uses a single sealed chamber with no intermediate sealing points along the viewing length, dramatically reducing the number of potential leak locations.
Why This Matters for Flammable or Toxic Service
Reducing leak paths is critical for facilities handling flammable or toxic process fluids. Every additional seal point on a sight glass assembly represents another potential release point. On a 20-foot unit with multiple glass segments, a traditional sight glass design would have dramatically more sealing points than a single magnetic chamber — meaningfully increasing risk exposure in hazardous service applications.
Applications Requiring Extended-Length Level Indication
Distillation Columns Chemical and refining processes often use tall columns where level must be monitored across significant height.
Large Storage Tanks Bulk storage of process fluids, especially in chemical and petrochemical facilities, may require indication across many feet of vertical range.
Multi-Story Process Vessels Vessels that span multiple building levels require level indication accessible and readable at various operator positions.
Reactor Vessels Large chemical reactors with significant liquid capacity benefit from full-range magnetic indication.
Engineering Considerations for Extended-Length MLI
When specifying a long-range magnetic level indicator:
Support requirements: Longer units typically require intermediate mounting supports to maintain alignment
Segmented indicator design: Very long units may use multiple indicator sections with connected float assemblies
Material selection: Extended chambers must maintain consistent wall thickness and material properties across their full length
Transportation and installation planning: Units of this length require careful handling and rigging during shipment and installation
Applications by Industry
Chemical Processing: Tall reactors, distillation columns, and bulk storage where flammable or toxic fluids make leak-path reduction essential
Refining: Distillation towers and large process vessels requiring full-height visibility
Oil & Gas: Large separator vessels and storage applications
Power Generation: Large feedwater tanks and process vessels requiring extended-range monitoring
Learn More
If your facility has a tall vessel or extended-length level indication requirement, Clark-Reliance's engineering team can help specify a magnetic level indicator solution suited to your specific dimensions and service conditions.
📧 sales@clark-reliance.com📞 +1 (440) 572-1500
