Typical Service Life of an Armored Glass Gage
- Oct 19, 2021
- 3 min read
Updated: Aug 6
How long does an armored glass gage actually last? The answer is more nuanced than a simple timeframe — it depends on application, maintenance, and design. Here's what you need to know about maximizing the service life of your Jerguson armored level gages.
The Short Answer
In general, an armored glass gage will provide at least one year of service before needing maintenance. However, this can vary dramatically based on the specific application, operating conditions, and water quality.
Real-World Service Life
The longer answer is much more encouraging. Jerguson has documented cases of armored gages installed in non-critical service that have lasted in excess of 20 years without replacement. Some facilities have even reported 30+ years of reliable operation from a single gage.
The key variables that affect service life:
Critical vs. Non-Critical Service Gages operating in critical, high-demand applications with frequent level changes experience more wear than those in standby or non-critical service. A gage on a high-pressure steam drum operates differently than one on a backup boiler that runs occasionally.
Water Quality Hard water with high mineral content causes scale buildup faster, requiring more frequent maintenance. Soft water or treated water systems allow longer intervals between service.
Maintenance Schedule Regular blowdowns (monthly or quarterly) dramatically extend gage life by removing sediment and scale before they damage seals and glass. Neglected gages wear out much faster.
Operating Temperature and Pressure Higher operating temperatures and pressures stress gasket seals more aggressively. Equipment running at mild conditions lasts longer than equipment at maximum rated conditions.
Installation Quality Proper installation with correct torque specifications and high-quality components ensures better sealing and longer service life.
The Re-mill Advantage
Here's what sets Jerguson armored gages apart: they contain a recessed gasket surface that allows you to re-mill rather than replace a gage. This is a critical cost-saving feature.
When a gage reaches the end of its service life due to seal wear or minor surface damage, instead of buying a new gage, you can send it back to Jerguson (or have it serviced locally) for re-milling. The recessed gasket surface is machined, new gaskets are installed, and the gage goes back into service — often for a fraction of replacement cost.
This design feature means your original gage investment can be extended another 10-15 years with a single service. It's why Jerguson gages are considered long-term investments rather than consumables.
Maximizing Service Life
To get 20+ years from your armored glass gage:
Maintain a Regular Blowdown Schedule: Monthly or quarterly depending on water quality
Replace Seals Promptly: If you notice weeping at gaskets, address it immediately
Monitor Gasket Condition: Replace gaskets proactively before they fail
Follow Manufacturer Maintenance Procedures: Use proper installation torque and quality replacement parts
Consider Water Treatment: Soft water systems reduce scale buildup and extend gage life
Plan for Re-milling: Budget for re-milling every 15-20 years rather than replacement
When to Replace vs. Remill
Replace the entire gage if:
Glass is cracked or deeply etched
Gage body is damaged or corroded
Re-milling is no longer economical
Remill the gage if:
Seals are leaking or worn
Surface damage is minor
The gage is still holding pressure safely
Learn More
For detailed information on Jerguson armored gage maintenance, operation, and proper installation procedures, explore Jerguson's solutions, animations, and operation/maintenance videos on our resources page.
