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💧 Pump Systems & VFD Case Study · Tewksbury, MA Area

Merrimack Valley Bedrock Constant Pressure VFD Conversion

Modernizing an older fluctuating well system with Variable Frequency Drive (VFD) technology to deliver consistent, city-caliber 60 PSI water pressure across a Merrimack Valley home.

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Groundwater Engineering Data

Before & After Field Ledger

Initial Problem / Metric
25–45 PSI fluctuating pressure / frequent switch chatter
Pre-intervention baseline measurement
Verified Post-Service Result
Continuous, rock-solid 60 PSI across 4 simultaneous fixtures
Certified pump flow / lab water analysis
Depth & Strata
360 ft bedrock well
Merrimack Group crystalline bedrock fracture network
Location & Jurisdiction
Tewksbury, MA Area
Middlesex County · Licensed MA Driller
The Groundwater Challenge

Symptoms & Site Diagnostics

A modern 4-bedroom home with three bathrooms and an automated landscape irrigation system suffered severe pressure drops whenever multiple fixtures operated simultaneously. Showers turned cold or weak when the irrigation kicked on, and the conventional mechanical pressure switch was rapidly clicking on and off, threatening to burn out the pump motor.

Turnkey Technical Solution

Execution & Field Intervention

Ogden Wells pulled the older undersized pump and installed a Franklin Electric SubDrive Variable Frequency Drive (VFD) constant pressure package. A digital pressure transducer monitors plumbing line pressure hundreds of times per second. Instead of cycling on and off at fixed pressure points, the VFD modulates the submersible motor speed in real time, matching water output exactly to instantaneous home demand.

Documented Client Results

Verified Performance Highlights

✓Eliminated pressure drops entirely, maintaining steady 60 PSI whether running one sink or 3 showers + laundry.
✓Replaced a bulky 80-gallon waterlogged tank with a compact 4.5-gallon diaphragm tank, freeing basement floor space.
✓Soft-start motor operation eliminated electrical startup surges, significantly extending pump lifespan.
✓Full electrical and mechanical installation completed in a single morning with zero interruption to evening water supply.

Equipment Deployed & Regulatory Compliance

Hardware & Tooling Deployed

  • • Franklin Electric SubDrive Utility Variable Frequency Drive controller
  • • Goulds 1.5 HP 10GPM 4-inch high-head stainless submersible pump
  • • Digital pressure transducer sensor and compact Flexcon inline diaphragm vessel

Codes & Permitting Standards

  • • Massachusetts Electrical Code (NEC Article 430 motor standards)
  • • Tewksbury Board of Health sanitary well seal standards

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Experiencing Low Yield, Poor Pressure, or Contaminants?

Put over 45 years of licensed New England groundwater experience to work for your property. Ogden Wells delivers proven drilling, hydrofracturing, and pump repair.

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