We are in the process of commissioning 4 18V50SG units, and made the decision early-on to use a 20% glycol solution in the cooling water systems for freeze protection. The primary concern was freezing the radiators during the occasional hard freeze (temps in the teens and 20’s for 6-8 hours)
My question for the group is: are you using glycol for freeze protection, or have you found the LT heaters adequate to maintain freeze protection for the radiators?
We have 12 18v50SG and the concentration we are using for glycol at the engines is 18%. There is a wartsila bulletin that talks about the cooling water I can email it to you just give me your email address.
This is the one we use: Propylene Glycol Industrial SKYHAWK.