pesales@pe-energy.com +1 ( 281 ) 310 – 0628

How Des-Case Oil Level Indicators Prevent Gearbox and Pump Failure

by

How does a Des-Case Oil Level Indicator prevent system failure?

A Des-Case Oil Level Indicator (OLI) prevents mechanical failure by providing maintenance professionals with a continuous 360-degree view of oil clarity and level. Traditional glass sight towers offer restricted visibility and are prone to shattering under impact. The Des-Case OLI, manufactured from robust, stain-resistant cast acrylic, directly resolves these issues. By installing the indicator at the equipment drain port, operators can monitor fluid discoloration, water contamination, and oil levels in real time before damage occurs to critical components like bearings and gears.

What are the chemical compatibility and mechanical specs of Des-Case OLIs?

The Des-Case Oil Level Indicator is engineered to withstand demanding industrial environments while maintaining optical clarity. The core material is a heavy-wall, stain-resistant acrylic compatible with all mineral oils, synthetic oils, and gear lubricants. The standard fittings are brass, with stainless steel fittings available as an option to handle more corrosive environments.

  • Operating Temperature Range: -40°F to 200°F (-40°C to 93°C)
  • Maximum Operating Pressure: 65 psi (4.48 bar)
  • Fittings: 1/2″ MNPT standard brass (stainless steel optional)
  • Breather Option: Compatible with Des-Case ND-2 Breather (0.3 micron absolute, β ≥ 1000) for 15″ and larger models

How do you select the correct Des-Case OLI size for your equipment?

Choosing the correct OLI length is critical to avoid oil spillage and ensure accurate level readings. To determine the correct size, measure the vertical distance from the equipment drain port to the top of the oil level. Select the next longest standard size of the indicator. It is recommended to choose an OLI that is at least 1 inch taller than the actual maximum oil level to prevent overflow and accommodate volume expansion during operation.

  • DC-OLI3: 3-inch overall length (7.62 cm)
  • DC-OLI6: 6-inch overall length (15.24 cm)
  • DC-OLI9: 9-inch overall length (22.86 cm)
  • DC-OLI12: 12-inch overall length (30.48 cm)
  • DC-OLI15: 15-inch overall length (38.10 cm)

What are the best practices for installing and maintaining a Des-Case OLI?

Proper installation and maintenance are essential for maximizing the operational life of your oil level indicator. Install the OLI using an elbow joint at the equipment’s drain port. To protect against physical impact from mobile machinery, place the unit in a shielded location. Installing a high-quality ball valve between the drain port and the OLI is highly recommended; this allows maintenance teams to isolate the indicator and perform cleanings or replacements without draining the reservoir.

Cleaning the OLI should be performed using only mild soap and water. Avoid commercial cleaning agents, solvents, or harsh chemicals, as they can cause immediate fogging, surface cracking (crazing), or chemical degradation of the acrylic. For units longer than 12 inches, always install a support bracket to provide physical stability against vibration.

When should a Des-Case acrylic oil level indicator be replaced?

While cast acrylic is highly durable and UV-resistant, extreme weather, sunlight, and chemical exposure will degrade the material over time. Regular visual inspections are required to identify signs of wear. Operators must watch for surface crazing (small hairline cracks), cloudiness or fogging that restricts visibility, or evidence of oil weeping from the bonded joint surfaces. For units installed in harsh outdoor conditions, replace the OLI every 2 to 3 years. Indoor applications typically achieve a service life of 3 to 5 years. Never exceed a maximum service life of 5 years regardless of the application environment.

Summary

  • 360-Degree Monitoring: The Des-Case OLI provides clear visual confirmation of oil levels and clarity, replacing hazardous, low-visibility glass sight towers.
  • Robust Material Limits: Constructed from stain-resistant acrylic rated for temperatures from -40°F to 200°F and pressures up to 65 psi.
  • Simple Sizing Rule: Always select an OLI size at least 1 inch taller than the maximum system fluid level to prevent over-filling spills.
  • Isolate for Safety: Always install a ball valve upstream of the indicator to allow cleaning and maintenance without draining the entire system oil reservoir.
  • Mandatory Replacement: Replace outdoor OLIs every 2-3 years, indoor units every 3-5 years, and never run any OLI past 5 years of service.

Step-by-step

  1. Isolate the system and install a ball valve at the equipment drain port to allow maintenance without oil drainage.
  2. Use an elbow joint to connect the Des-Case Oil Level Indicator to the ball valve.
  3. Apply the red and green level marker stickers to designate the running and idle oil level limits.
  4. Install a support bracket for stability if using an OLI longer than 12 inches.
  5. Connect an optional ND-2 breather or loop back to the system reservoir via the top 1/2″ NPT port.

Products discussed in this episode

Browse all DES-CASE products on PE Energy Industrial Supply.

Related episodes

Listen on your favorite platform

Leave a Comment