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Chemicals & Equipment

Also, If I want to protect the system from bursting down to -20F and there is 400 gallons of water in the system outdoor wood boiler. Can you tell me how much I should order?

First, you need to use a glycol refractometer to determine your freexe protection.

For –20F you need a 40% solution of glycol in the system. If you drain part of the system, you will dump 30% solution in order to fill the system with pure glycol.

Total glycol in the system:

• At 0.3*400 =120 gallons
• At 0.4*400=160 gallons

So you have 120 gallons of glycol in the system. You actually need 160 gallons or 40 gallons more based on that volume. If you dump 55 gallons of your 30% solution. You will lose 16.5 gallons of glycol.

So if you add 55 gallons of pure glycol, you should be really close to 40% solution.

So either order one drum of Propylene Glycol USP or corrosion inhibited glycol. Our corrosion inhibited glycol is a 95% solution or 53 gallons of pure glycol and 2 gallons of inhibitor. So you may want to purchase an additional pail.