1. Standard Change Over

The Standard Change Over method uses new chemical to purge old chemical out of the lines. This method is acceptable, but we strongly encourage using the Air Purge method when possible. When using one chemical to push (purge) another chemical from the hose lines, you must be certain to fully purge the old chemical. Often, a user will conclude the purge when the air between chemicals sputters out the hose end. Enverge recommends continuing to purge the lines after the sputter, collecting at least 1 full gallon of new chemical. This ensures that the old chemical is more thoroughly cleaned from the hose line.

2. Air Purge Change Over

The Air Purge Change Over method is an extremely effective method to cleanly purging old chemical from your lines, prior to pumping new chemical into the lines. This method also reduces waste and nearly eliminates those chances of contamination. A simple Flush Kit attachment is required to perform an air purge. This is provided free of charge from Enverge. You can also build and assemble your own kit from common components. Assemble the Flush Kit before proceeding to the Air Purge Change Over process below.

The below flush kit uses air to purge chemical from lines when changing chemicals. The process includes purging chemical back into the drum, allowing for minimal chemical loss. The kit is assembled and installed as detailed below. Assembly must be completed prior to beginning the Air Purge Change Over process.

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Flush Kit Assembly

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Flush Kit Installed at Transfer Pump

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SECTION 1 - Air Flush #1

1. Make sure the proportion and transfer pumps are off and depressurized (follow manufacturer’s recommendations).
2. Assemble and securely install the air flush kit between the resin transfer pump and resin transfer line (once installed, this can be left in place).
3. Secure the resin recirculation line to the resin drum or other clean container.
4. Open the resin recirculation valve.
5. Attach air line to air flush kit.
6. SLOWLY open ball valve on air flush kit.
7. Flush resin recirculation line with air until sputtering is heard and/or seen.
8. Close recirculation line and ball valve on the air flush kit.
9. Remove spray gun from hose.
10. Secure hose to resin drum or clean container.
11. Open the resin manual valve on manifold.
12. SLOWLY open the ball valve on the air flush kit.
13. Flush with air until sputtering is heard and/or seen coming out of the manifold.
14. Close ball valve on the air flush kit.
15. Close manual valve on manifold.

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SECTION 2 - Soapy Water Flush

1. Remove the resin transfer pump from resin drum.
2. Clean and drain the transfer pump back into the resin drum or other clean container. Make sure to wipe down well (turn over pump and drain if necessary) and pop the lower check ball valve to drain material inside of the transfer pump.
3. Prepare about 2 gallons of soapy water. It is important to use laundry detergent so suds are kept under control. Add about 10 oz of detergent to the 2 gallons of water. Mix well.
4. Secure cleaned resin transfer pump in a container with about 1 gallon of soapy water.
5. Secure recirculation line to a waste container.
6. Open resin recirculation line into a waste container.
7. SLOWLY open air valve on the resin transfer pump.
8. Purge resin recirculation line until the soapy water is flowing freely.
9. Turn off air valve to resin transfer pump.
10. Turn off recirculation line.
11. Secure hose to waste container.
12. Open the resin manual valve on the manifold.
13. SLOWLY open air valve on the resin transfer pump.
14. Pump the remaining water into the hose.
15. Turn off the transfer and let the pressure bleed off.
16. Close the manual valve on the manifold.

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SECTION 3 - Air Flush #2

1. Secure the resin recirculation line to a waste container.
2. Open the resin recirculation line.
3. SLOWLY open ball valve on air flush kit.
4. Flush resin recirculation line with air until sputtering is heard and/or seen.
5. Close recirculation line and ball valve on the air flush kit.
6. Secure hose to a waste container.
7. Open the resin manual valve on manifold.
8. SLOWLY open the ball valve on the air flush kit.
9. Flush with air until sputtering is heard and/or seen.
10. Close ball valve on the air flush kit.
11. Close manual valve on manifold.

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SECTION 4 - Chemical

1. Remove resin transfer pump from the water container.
2. Wipe transfer pump down well and drain the resin transfer pump into a waste container (make sure to turn over and pop the lower check ball valve).
3. Replace the resin transfer pump into the new resin drum.
4. Secure recirculation line to a waste container.
5. SLOWLY open air to transfer pump.
6. Flush with new chemical until clear chemical is seen coming out of the resin recirculation line.
7. Close recirculation line.
8. Secure hose to waste container.
9. SLOWLY open the resin manual valve on the manifold.
10. Flush with new chemical until clear chemical is seen coming out of the hose.
11. Close resin manual valve on the manifold.

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After completion of the above steps, you are ready for standard operating procedure for the new chemical. For waste disposal, recycle materials as much as possible. The material from Air Flush No. 1 is good chemical and can be reclaimed. The waste generated should be disposed of in accordance with local and/or federal regulations.

It is important to monitor chemical and be aware when the level of chemical reaches near the bottom of the drum. If you continue pulling the trigger when 1 of your drums has emptied, it can quickly lead to a cross-over in the gun. Do not allow this to occur.

The drum pump and recirculation line can be used to pour most of the remaining chemical from your used drum into a new drum. However, there is limited room in a new drum and you may need to spray out a portion of that new drum before you can pour up into it.

To get ALL of the chemical from your old drum into your new drum, you may need to physically lift the old drum and pour it into the new one. This is required because the drum pump does not touch the floor of the drum. When physically pouring up, follow the below guidelines:

• At least 2 people should be present to assist with lifting the drum.
• Use a specially designed drum funnel that rests securely on top of the drum being poured into.
• Have 1 funnel designated for A-Side ISO pouring and a second funnel designated for B-Side Resin pouring. NEVER switch funnels.
• Make sure the funnel is clean and free from debris.
• Use a screen in the funnel to catch any crystals or debris and prevent contamination into the new drum.

Always be mindful of spills and only pour up in a safe environment where chemical spill can be controlled. Spills do happen, when they occur use spill absorbent granules to immediately contain the spill. Then clean the granules and dispose of them properly. For additional guidelines on proper disposal, see the Cleaning Up section of this app.

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Mixing Pour Up Chemicals

All like resins must be mixed together. Never mix a closed cell resin with open cell resin. Never mix different brands of resin. When pouring up resin, make certain to follow the mixing guidelines and always re-mix resin after pouring up. Never mix Open Cell ISO and Closed Cell ISO during a pour-up. Never mix different brands of ISO.

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Pro Tip

To minimize the amount of chemical than needs to be physically poured from one drum into another, use this technique: Unscrew the drum pump from the bung. Use a 2x4 or similar board placed underneath one side of the drum, allowing for chemical to pool on the opposing side. Position the drum pump to pump out this pooled chemical that would have otherwise been out of reach.

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