METALGUARD® G5

METALGUARD G5 is an additive system for mono- and di- and tri- glycols, including diethlyene and triethlyene glycols, which enhances their performance in applications such as the following:

• The use of monopropylene glycol (MPG) and monoethylene glycol (MEG) as heat transfer fluids in line and bath heaters
• The use of diethlyene glycol (DEG) as a heat transfer fluid in line and bath heaters
• The use of DEG as a water removal agent in natural gas dehydration systems
• The use of triethlyene glycol as a water removal agent in natural gas dehydration systems

When MEG/water or MPG/water solutions are used as the heat transfer fluid media in line heaters and bath heaters for natural gas gathering and pipeline transport systems, they must be inhibited to prevent rapid corrosion of metallic materials of construction in these systems. METALGUARD G5 can be used in two ways to improve the level of performance of the MEG or MPG in this application:

1. It can be used to inhibit glycol/water solutions down to con centrations as low as 30% glycol by volume. This will allow you to avoid the purchase of expensive finished heat transfer fluids by buying the appropriate glycol and inhibiting it yourself. METALGUARD G5 can be used to inhibit glycol/ water solutions using deionized water.
2. METALGUARD G5 can be used to restore or boost the inhibitor levels in heat transfer fluids already in service. If you have heat transfer fluids that have been in use in line or bath heaters for one year or longer without being tested for inhibitor depletion, we recommend that you submit a sample to a laboratory for testing. If you send a copy of your test results, we can make recommendations for fortifying your inhibitor levels with METALGUARD G5 to extend the effective service life of your fluid.

DEG can be used as a base for heat transfer fluids used in line and bath heaters. DEG extends the upper temperature limit at which the fluid can be used by virtue of its higher boiling point, but it can create pump motor electrical system overload problems when the system is started up after downtime during cold weather periods due to the relatively high viscosity of DEG. METALGUARD G5 also contains viscosity modifying ingredients to prevent thickening of DEG during periods of downtime during cold weather, saving pump motors, fuses, breaker switch resetting and start-up problems, in general. METALGUARD G5 also serves as an out stand ing corrosion inhibitor or reinhibitor additive pack age, and it extends the service life of DEG by controlling thermal and oxidative degradation to tars and preventing “coking.”

DEG can be used as an effective water removal agent in natural gas dehydrators, but is limited to lower average operating temperatures than TEG due to its lower boiling point; however, it provides the significant advantage over TEG of a much lower tendency to absorb benzene from natural gas. Absorption of relatively high levels of benzene by TEG can make it a hazardous waste. METALGUARD G5 controls the thermal and oxidative degradation of DEG, extending the upper temperature limit at which it can be operated in dehydration systems by 50% or more.

When TEG is used as a water removal agent in natural gas dehydration systems, it will thermally and oxidatively degrade over time to form corrosive glycolic acids, and gummy tars and fouling coke deposits. METALGUARD G5 will both extend the upper temperature limit at which TEG can be used and retard the formation of glycolic acids, tars and carbonaceous coke to prolong its effective service life.

Specifications

• ASTM D3306
• ASTM D4985

Nearly all of OEM automotive light-duty ad heavy-duty specifications are patterned after or identical to the ASTM standard specifications given above. For individual OEM specification compliance contact your sales representative. Note that the ASTM specifications listed include the key performance tests (ASTM D1384, D4340, D1881, D2570, D2809)