Attachment 4 - MAHG121108 Repair Repaint Convault Tanks - Convault Guidelines.pdf

ConVault, Inc., 4109 E. Zeering Rd, Denair, CA 95316, (800) 222-7099 or (209) 632-7571 http://www.convault.com , info@convault.com

REPAIR

and

REPAINT

GUIDELINES

(Liquid Rubber (EPDM) or Acrylink G)

(Revised Dec 2007)

Repaint Procedures, Product Ordering Information and Chart 12 Pages

Convault Vacuum Painting Procedures with Figures 1-4 8 Pages

DAP & DEVCON Product Information 5 Pages

EPDM (Liquid Rubber) Product Information 9 Pages

ACRYLINK G Roofing System Product Information 10 Pages http://www.convault.com mailto:info@convault.com

C REPAIR and REPAINT GUIDELINES

For

CONVAULT TANKS

Repair Repaint Guidelines Page 1 of 12 Revised 12/03/07

I. Introduction

While Convault tanks have been designed and manufactured so that they require little maintenance, they still should have regularly scheduled inspections and maintenance.

Small cracks in concrete could result from normal everyday expansion and contraction.

Such cracks will not affect the primary or secondary containment, fire protection capabilities or structural integrity of the tanks. However, since cracks can absorb and retain water, in a colder climate there is a possibility that water freeze and thaw process may cause erosion of the concrete. Tank owners should have a regular maintenance program to inspect their tanks, repair cracks and refinish the tanks if necessary. The refinishing interval may vary depending on geographic conditions, ambient conditions, and the exterior finish but should be considered at least every three to five years. Refinishing of the tank and repairing of small cracks are not covered under the general tank warranty. If you have questions about the type of exterior finish on your tank you should contact the local manufacturer.

Note: Read ALL instructions on pages 1-8 before using these procedures.

The order of items in this document may not match the order of repairs required on the job, depending on the original finish used on the tank, the condition of the tank and other job specific circumstances.

II. Summary of Sequence:

If there is water in the interstice, it should be pumped or vacuumed out. See paragraph B of the attached CONVAULT VACUUM PAINTING PROCEDURE for pumping water out of interstice.

Generally the tank should be pressure washed and scrubbed to remove general dirt, loose paint and chalking paint. Then any remaining decals, chipped, flaked or loose paint should be removed, cracks should be cleaned and if necessary grooved, any loose caulking removed from around pipe nipples, and all smooth surfaces should be roughed up using sandpaper or wire brush.

The tank should then be pressure washed again to remove dust and loose materials generated during the preparation process. After letting the tank dry, the pipes can be painted as required and concrete cracks repaired as described in this document. After paint on pipes has cured sufficiently, caulk around nipples. After everything has cured (let caulk cure a minimum of 1 hour), apply paint to top and/or sides as needed. If water has seeped into the concrete, evidenced by the calcification deposits on the tank walls, you should paint the top first and wait a few weeks or until the concrete is dry before painting the sides. Otherwise, water in the concrete may push out on the paint causing bubbles. If your tank is dry, we recommend that the sides be painted first as curing is typically quicker for the paint used on the sides than it is for the Liquid Rubber top coat. In some cases you may

CREPAIR and REPAINT GUIDELINES For CONVAULT TANKS

Repair Repaint Guidelines Page 2 of 12 Revised 12/03/07 not need to paint the walls. While painting of the top and top bevel is critical to preventing water intrusion, painting of the walls is mostly cosmetic.

III. Preparation.

A. Pressure wash the area that is to be repaired and repainted. This will remove the top layer of dirt and loose decals.

B. Remove decals and signs from area that is to be repainted. Decals can be removed with the use of a single edge razor blade or a sharp putty knife. Plastic signs can be removed by driving a wedge under the sign. Some aluminum signs are attached with screws which will have to be removed. Do NOT REMOVE the UL Label. It should be covered with masking tape prior to painting.

C. Remove all chipped, flaked or loose paint from the tank surface. It is essential to have a solid surface for the new paint to stick.

D. Sand any smooth surface to be painted and lightly sand non-smooth areas on tank top.

E. Clean off old and loose caulking around the nipples at the tank top with a sharp pointed object to approximately ¼”depth. Be careful not to damage the powder coating on the pipe nipple. Lightly sand the lower ½ inch of pipe nipples.

F. Clean area of calcification with a scraper, wire brush, or use a grinder with wire brush wheel. A light acid such as white vinegar or muriatic acid may also be used to help remove the calcification.

G. Wash the vault with a scrub brush and detergent and pressure wash it until clean to remove all loose debris, dust and other materials. If any area of the vault has been contaminated with diesel fuel, take extra effort to make sure all residue has been removed.

Do not use EPDM on this area.

H. After washing, allow the vault to dry prior to painting. The surface must be clean, dry and above 40 degrees F.

IV. Concrete Crack Repairs

Note: While repairing of cracks in the top of the tank and the top bevel is critical to preventing water intrusion, repairing of cracks in the walls is mostly cosmetic. Crack repair to the walls will usually make cracks more obvious and require painting of the sides to restore a pleasant appearance. If the tank has taken on water through the cracks in the top, you must wait till the top is sealed and the tank has dried before painting the sides. Drying may take weeks. These factors should be taken into account before deciding to repair cracks in the wall.

Repair Repaint Guidelines Page 3 of 12 Revised 12/03/07

A. Tanks with Smooth Finish

1. Cracks larger than 1/16”

a) Make a 1/8” to ¼” deep by 1/8” to ¼” wide groove in the concrete.

b) Clean crack with compressed air.

c) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

d) Caulk using DAP “Concrete and Mortar Filler and Sealer”. Overfill slightly as the DAP will shrink, or let cure and refill. You may have to refill the groove two or even three times to get it level.

e) Smooth sealer to the same height of original surface leaving a smooth transition.

f) Allow a minimum of one hour to cure.

2. Cracks 1/16” or smaller

a) Clean crack with compressed air.

b) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

c) Caulk using DAP “Concrete and Mortar Filler and Sealer”.

d) Smooth sealer to the same height of original surface leaving a smooth transition.

e) Allow a minimum of one hour to cure.

B. Tanks with Exposed Aggregate or Natural Finish

1. Cracks on tank top and top bevels

a) Cracks larger than 1/16”

(1) Make a 1/8” to ¼” deep by 1/8” to ¼” wide groove in the concrete.

(2) Clean crack with compressed air.

(3) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

(4) Caulk using DAP “Concrete and Mortar Filler and Sealer”. Overfill slightly as the DAP will shrink, or let cure and refill. You may have to refill the groove two or even three times to get it level.

(5) Smooth sealer to the same height of original surface leaving a smooth transition.

(6) Allow a minimum of one hour to cure.

b) Cracks 1/16” or smaller

(1) Clean crack with compressed air.

(2) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

(3) Caulk using DAP “Concrete and Mortar Filler and Sealer”.

(4) Smooth sealer to the same height of original surface leaving a smooth transition.

(5) Allow a minimum of one hour to cure.

2. Cracks on tank walls and Lower bevels

a) Clean crack with compressed air.

b) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

c) Seal crack using Devcon 5-minute Flow-Mix two-part epoxy sealer. You will need to apply small amounts at a time as it is very liquid when first applied. If the

Repair Repaint Guidelines Page 4 of 12 Revised 12/03/07 vacuum is pulling the epoxy in so much that it is recreating a hole, reduce or temporarily remove the vacuum until that hole is sealed.

d) Immediately smooth sealer to the same height of original surface leaving a smooth transition. It is hard to smooth the epoxy once it begins to cure.

e) Allow a minimum of ten minutes to cure.

C. Tanks with STO or Perma Crete Finish

1. Cracks on tank top and top bevels

a) Cracks larger than 1/16”

(1) Make a 1/8” to ¼” deep by 1/8” to ¼” wide groove in the concrete.

(2) Clean crack with compressed air.

(3) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

(4) Caulk using DAP “Concrete and Mortar Filler and Sealer”. Overfill slightly as the DAP will shrink, or let cure and refill. You may have to refill the groove two or even three times to get it level.

(5) Smooth sealer to the same height of original surface leaving a smooth transition.

(6) Allow a minimum of one hour to cure.

b) Cracks 1/16” or smaller

(1) Clean crack with compressed air.

(2) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

(3) Caulk using DAP “Concrete and Mortar Filler and Sealer”.

(4) Smooth sealer to the same height of original surface leaving a smooth transition.

(5) Allow a minimum of one hour to cure.

2. Cracks on tank walls and Lower bevels

a) Clean crack with compressed air.

b) Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

c) Seal crack using Devcon 5-minute Flow-Mix two-part epoxy sealer. You will need to apply small amounts at a time as it is very liquid when first applied. If the vacuum is pulling the epoxy in so much that it is recreating a hole, reduce or temporarily remove the vacuum until that hole is sealed.

d) Immediately smooth sealer to the same height of original surface leaving a smooth transition. It is hard to smooth the epoxy once it begins to cure.

e) Allow a minimum of ten minutes to cure.

V. Repainting Exposed Steel

A. It is imperative that all nipples are properly protected from inclement weather conditions.

B. Check all exposed metal nipples, manway and spill container.

Repair Repaint Guidelines Page 5 of 12 Revised 12/03/07

C. Remove any visible rust and old paint with wire brush or scraper.

D. If the UL plate is attached to a pipe, cover it with masking tape to prevent coating it with paint.

E. Apply good quality rust inhibitor paint such as Rust-oleum on all exposed metal.

Unprotected steel exposed to humid saline ocean weather will severely rust in a short period of time.

VI. Concrete Repainting Procedure

Note: If water has seeped into the concrete, evidenced by the calcification deposits on the tank walls or moisture in the area of a crack, you should paint the tank top first and wait a few weeks or until the concrete is dry before painting the sides. The best time to check if the concrete is dry is immediately after the tank has been refilled with product.

A. Tank Walls and Bottom Bevels.

1. Remove decals and signs, sand, pressure wash, repair cracks and prepare surface as detailed in Sections III through IV above.

2. If the UL Label is attached to the side of the tank, cover it with masking tape.

3. Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

4. Paint the Vault walls and bottom bevels using an appropriate coating. Follow carefully the manufacturer instructions for storing, mixing and application of the paint.

5. If your tank walls have a Smooth Finish, a STO Finish, or a Perma Crete Finish, the following paints are acceptable

a) Any quality outdoor latex.

b) Imron 2.8 HG by Dupont, Manufactured by Passonno Paints, Watervliet, NY

6. If your tank walls have an Exposed Aggregate Finish, you may consider resealing the walls of your tank using:

a) Rhoplex AC-630 Emulsion, acrylic polymer.

b) THORO EA-SEALER WB HI GLOSS.

7. Affix new signage on the tank. Signs or decals may be purchased from your Convault representatives or local petroleum equipment supplier. See VII B below for affixing signs.

B. Tank Top and Top Bevels

1. Remove decals and signs, sand surfaces, pressure wash, repair cracks and prepare surface and pipe nipples as detailed in Sections III through V above.

2. You may wish to mask all nipples starting at ½” above the tank top so that the concrete coating will only be on the lower ½ inch of the pipe.

3. If the tank wall finish is smooth and you are only painting the top, you may want to mask the tank wall immediately below the lower edge of top bevels to obtain an even edge. If the tank walls do not have smooth finish (such as having exposed aggregate or STO finish), you will need to carefully paint the bottom edge of the upper bevel so that it has a nice looking edge.

Repair Repaint Guidelines Page 6 of 12 Revised 12/03/07

4. Apply a low vacuum to tank interstice. See attached Convault Vacuum Painting procedures.

5. Caulk around the nipples using DAP “Concrete and Mortar Filler and Sealer”.

6. Let cure for a minimum of 1 hour.

7. Paint tank top and top bevels using EPDM Liquid Rubber or Acrylink G Roof Coating.

Note: Acrylink G advantages are:

a) it is more fuel resistant than EPDM,

b) it is easier to apply and can be cleaned up with water,

c) cures faster than EPDM,

d) acts more like paint during application,

e) it will adhere to an oil based paint, and

f) it is a one part product, so you don't have to measure a catalyst or waste premixed product.

Acrylink G disadvantages are:

a) it needs at least two coats

b) if you must walk on the first coat and you have any on your shoes it will pull the first coat up off the Convault

c) it can't get wet for a period of time because it dries by evaporation, and

d) it doesn't seem to adhere as well as EPDM to previously painted Convault surface.

EPDM advantages are:

a) it only needs one coat,

b) it cures even in humid conditions

c) if it gets rained on it will not affect the curing, and

d) it has good adhesion to epoxy and raw concrete finishes.

EPDM disadvantages are:

a) it needs warm temperature to cure, (Temperature drops below freezing arrest the cure, but will not damage Liquid Rubber. The cure reaction will resume again whenever adequate temperature returns.)

b) it has a long cure time,

c) it is a two part product requiring mixing,

d) it will not adhere to oil based paint, and

e) it cannot be used on concrete that has been contaminated with diesel fuel or oil.

8. For both paints, carefully follow the manufacturer instructions for storing, mixing and application of the paint. Also, please note that the standard color is white.

We do not recommend adding any colors since white will better reflect sunshine and heat and therefore result in less vapor emissions to the air and savings in fuel costs. If you must add color to the paint to match the existing color of the tank, refer to manufacturer’s product information. If you are using Acrylink G, skip to paragraph #10. If you are using EPDM, continue at #9.

Repair Repaint Guidelines Page 7 of 12 Revised 12/03/07

9. Painting with EPDM

a) To help you purchase and mix the proper amount of paint for one tank, we have attached a table showing you the square footage of tank top including the top bevel for different tank sizes and estimated amount of paint required. We recommend that you mix full units to insure proper amount of catalyst is used.

b) The paint manufacturer suggests that on average you will be using one gallon of paint per 30 square ft area. Try to apply the EPDM as evenly as possible and reduce the occurrence of puddles.

c) A brush is necessary for placing the product under piping or other areas where the roller cannot reach, for finishing around nipples, and for cutting in the bevel. It is better to finish the brushwork on the top first so you have better working area.

We have found that pouring the product as evenly as possible is preferable to pouring in one place and trying to move the product. Once the product is spread, it can be smoothed out with a short nap (1/4”) roller. The consistency of EPDM is similar to honey. It will string, and slowly flow to the low points. We do not recommend painting in windy conditions as every time you raise a brush or roller the wind will blow the resulting string or sheet of paint.

d) Do not place too thick a coating on the bevels as it will migrate down off of the bevel and onto the sides over time. Rolling at a 45 degree angle to the bevel and using a roller less than 50% saturated with paint seems to work best. If you do place a thick coating on the bevels, check it periodically and keep pulling it back up until it becomes stiff.

e) On large tanks you must work from one end, finishing as you go. You should use about 1 gallon for each 30 sq ft, or a little more than 3 1/2 feet of length of the large (8 ft wide) tanks. It will take 4 to 8 hours to place the EPDM on a large tank that has minimum brush work. On a hot day the EPDM should be kept in the shade after mixing, or even in ice or it will begin thickening and become hard to work toward the end of the job. “In 75 deg F to 85 deg F, the product will start to thicken up in about 4 hours…” EPDM cures at temperatures above 55 degrees and humidity does not affect the curing process. Skip to #11

10. Painting with Acrylink G

a) To help you purchase the proper amount of paint for one tank, we have attached a table showing you the square footage of tank top including the top bevel for different tank sizes and estimated amount of paint required.

b) The paint manufacturer suggests that for both coats you will be using a total of one gallon of paint per 27 square ft area. Remember that the paint is to be put on in at least two coats, so you may get 40 to 50 square feet per gallon on the base coat.

We suggest that you use a roller to apply all coats. Try to apply the Acrylink G as evenly as possible and reduce the occurrence of puddles.

Repair Repaint Guidelines Page 8 of 12 Revised 12/03/07

c) A brush is necessary for placing the product under piping or other areas where the roller cannot reach, for finishing around nipples, and for cutting in the bevel. It is better to finish the brushwork on the top first so you have better working area.

d) On large tanks you must work from one end, finishing as you go. The paint should be kept in the shade and sealed, or it will cure in the bucket. Acrylink G should not be applied if rainfall or freezing temperatures are expected. See manufacturer’s recommendations.

e) Acrylink G sticks very well to itself, so be very careful when applying the second coat. If you get any paint on the bottom of your shoes and walk on the first coat, it may pull the first coat off the tank. Some applicators wear paper booties when applying the second coat. The Manufacturer recommends that each coat be allowed to cure for at least four (4) hours, depending upon temperature and humidity conditions, before a subsequent coat is applied.

11. Once an area is coated check the finish of the tank, and fill in any pinholes where the vacuum may have pulled the paint into the concrete. If you have extra paint it can be applied to areas with a thinner coat.

VII. Affix New Signage On Tank.

A. Signs or decals may be purchased from your Convault representatives or local petroleum equipment supplier. Peel-and-stick decals will not stick to EPDM or Acrylink G.

B. The best method for attaching the placard type signage to the tank is to use two types of adhesive in conjunction with each other. DAP “Strong Stik Instant Grab Adhesive” will provide long term adhesion. However, though the name includes the words “Instant Grab”, the Technical Bulletin states that it has 15 minutes maneuverability. This means it will slide down the tank during the 15 minutes, or even fall off. Use Devcon “5-minute two-part epoxy sealer” to hold it in place while the DAP cures. First place thin strips of DAP “Strong Stik Instant Grab Adhesive” approximately every three inches in a vertical orientation on the back of the placard and a continuous strip across the top. It is best to make short (not continuous) horizontal strips on the bottom of the placard so that it will not trap rain and condensation behind the sign. Lay the placard flat and place strips of Devcon in-between the strips of DAP. Wait about 2 to 3 minutes from the time you began applying the Devcon depending on the temperature. Then apply the decal on the tank, holding it in place till the Devcon sets. If you don’t wait, the Devcon will drip out. If you wait too long, the Devcon will set and will not adhere to the tank coating. Timing on the Devcon is critical for good results. After the Devcon is set, seal the top and side edges of the placard with DAP “Concrete and Mortar Filler and Sealer”.

http://www.convault.com/map/index.html

Repair Repaint Guidelines Page 9 of 12 Revised 12/03/07

VIII. Purchasing Materials

A. DAP “Concrete and Mortar Filler and Sealer” can be purchased at your local hardware store or store such as Lowe’s or Home Depot.

B. DAP “Strong Stik Instant Grab Adhesive” is a relatively new product that may or may not be at your local hardware store, or store such as Lowe’s or Home Depot. A partial list of local sellers can be found at http://www.dap.com/rpm_poi.asp?frmInputProduct=398, or you can get more accurate purchasing information at http://www.dap.com/ask_the_expert.aspx.

C. Devcon 5-minute Flow-Mix two-part epoxy sealer (part number 20445) can be purchased at hardware stores, Wal-Mart, or some auto parts stores. The best thing to do is go to http://www.itwconsumer.com/wheretobuy.aspx, scroll down to “Flow-Mix 5-minute epoxy” and enter your state. This will give you a list of stores that sell the product. We recommend you use the Flow-mix (part number 20445) because the tip mixes the two parts as it dispenses the product. Otherwise you must mix the parts manually which may result in improper mixing, or the product may harden before it can be used. Note: you only have 5 minutes per mixing tip, so have everything ready before opening the unit.

D. Acrylink G Roof Coating can be ordered directly from Acrylink G in Texas.

http://www.acrylinkg.com or call (800) 237-8759.

E. EPDM Liquid Rubber can be ordered directly from EPDM Coatings online. It can be ordered in 1 gallon containers or 5 gallon containers. Go to http://www.liquid-roof.com or call 610-298-1989 or email info@epdmcoatings.com. They are in located in Pennsylvania.

F. Outdoor latex and paints can be purchased locally.

G. Imron 2.8 HG by Dupont, Manufactured by Passonno Paints, Watervliet, NY More information is available at https://www.bennette.com/vcart/item/?item=1873 and http://www.bennette.com/pdf/Imron2-8HG.pdf

H. Rhoplex AC-630 Emulsion, acrylic polymer, manufactured by Rohm and Haas

Company, Philadelphia, PA can be purchased from ChemCentral 708-594-7000 or go to http://www.chemcentral.com/locations/ The minimum quantity is 5 gallons.

I. THORO EA-SEALER WB HI GLOSS by BASF Building Systems, Shakopee, MN http://www.buildingsystems.basf.com/localRepresentativeMap.asp to find local rep, or http://buildsite.com/dbderived/thoro/derived_files/derived254792.pdf for more information.

http://www.dap.com/rpm_poi.asp?frmInputProduct=398 http://www.dap.com/ask_the_expert.aspx http://www.itwconsumer.com/wheretobuy.aspx http://www.acrylinkg.com http://www.liquid-roof.com https://www.bennette.com/vcart/item/?item=1873 http://www.bennette.com/pdf/Imron2-8HG.pdf http://www.chemcentral.com/locations/ http://www.buildingsystems.basf.com/localRepresentativeMap.asp http://buildsite.com/dbderived/thoro/derived_files/derived254792.pdf mailto:info@epdmcoatings.com

Repair Repaint Guidelines Page 10 of 12 Revised 12/03/07

EPDM Liquid Rubber Requirements

Based on Coverage of approximately 30 sq. ft per Gallon

Tank Size

Length

Width

Sq. ft.

Tank Top Including

Top Bevels

Required Gallons

Paint Per Tank

Gallons Paint

Per Tank (Mostly Rounded Up)

250 7' 8" 3' 9" 32 1.07 1 500 11' 4' 6" 54 1.80 2

1000 11' 5' 8 ' 67 2.23 3 2000 11' 3" 8' 95 3.17 3

3000LP 11' 3" 8' 95 3.17 3

3000DW 12' 2" 8' 103 3.43 4

3000SP 17' 7" 8' 148 4.93 5

4000LP 17' 7" 8' 148 4.93 5

4000DW 12' 2" 8' 103 3.43 4

4000HP 12' 6" 8' 106 3.53 4

5200G 15' 6" 8' 131 4.37 5 6000 17' 7" 8' 148 4.93 5 6700 28' 7" 8' 239 7.97 8 8000 23' 1" 8' 193 6.43 7

10000 28' 7" 8' 239 7.97 8 12000 34' 1" 8' 284 9.47 10

Repair Repaint Guidelines Page 11 of 12 Revised 12/03/07

Acrylink G Requirements Based on

Coverage of approximately 27 sq. ft per Gallon

Tank Size

Length Tank Width

Sq. ft. Tank Top

Including Top Bevels

Gallons of Paint per tank 250 7' 8" 3' 9" 32.0 1.2 500 11' 4' 6" 53.9 2.0

1000 11' 5' 8 ' 67.0 2.5 2000 11' 3" 8' 95.4 3.5

3000LP 11' 3" 8' 95.4 3.5

3000DW 12' 2" 8' 103.0 3.8

3000SP 17' 7" 8' 147.8 5.5

4000LP 17' 7" 8' 147.8 5.5

4000DW 12' 2" 8' 103.0 3.8

4000HP 12' 6" 8' 105.7 3.9

5200G 15' 6" 8' 130.6 4.8 6000 17' 7" 8' 147.8 5.5 6700 28' 7" 8' 238.8 8.8 8000 23' 1" 8' 193.3 7.2

10000 28' 7" 8' 238.8 8.8 12000 34' 1" 8' 284.4 10.5

Repair Repaint Guidelines Page 12 of 12 Revised 12/03/07

Area of ConVault End and Side Walls (see Note 1)

Models (see Note 2) Tank

Length Tank Width

Tank Body Height

End and Side Walls Area (sqft)

250 7' 8" 3' 9" 2' 11" 61 500 11' 4' 6" 3' 87

1000 11' 5' 8 ' 4' 125 2000 11' 3" 8' 5' 2" 182

3000LP 11' 3" 8' 6' 11" 250

3000DW 12' 2" 8' 6' 7" 247

3000SP 17' 7" 8' 4' 10" 227

4000LP 17' 7" 8' 5' 11" 291

4000DW 12' 2" 8' 8' 3" 321

4000HP 12' 6" 8' 8' 3" 326

5200G 15' 6" 8' 8' 3" 375 6000 17' 7" 8' 8' 3" 408

6700LP 28' 7" 8' 5' 11" 417

8000 23' 1" 8' 8' 3" 497

10000 28' 7" 8' 8' 3" 586 12000 34' 1" 8' 8' 3" 675

Note 1: This square footage does not include the top bevel as it is assumed that it was painted with EPDM or Acrylink G.

Note 2: If you have a tank split, use the aggregate total of your unit to find the correct line above. The number of compartments in the unit does not affect the area of the external surface.

CONVAULT

VACUUM PAINTING

PROCEDURES

July 2008

CONVAULT VACUUM PAINTING PROCEDURE

The purpose of this procedure is to provide an improved method of coating the tank and to help seal around nipples and small cracks in the concrete vault.

A. Prepare exterior tank surfaces by sanding and washing in accordance with Convault recommended procedures.

B. Check the interstice for liquid in the Leak Detector Tube. If it does not contain any visible liquid skip to step B2. If it contains liquid, determine if it is water or fuel. If it is fuel contact ConVault immediately. If the tank top has cracked or the caulking around the nipples on tank top has deteriorated, it is possible that water has seeped into the interstice. If water has entered in the interstice, it should be removed using a combination of siphoning, pumping and/or using vacuum system. To remove the water, proceed as follows:

1. Siphoning and/or Pumping out the Water

a) If the tank has a communication nipple, remove the cap. Make sure you keep this cap, as it will need to be reinstalled after you have finished the painting procedure.

b) Remove the cap or any monitoring sensors from the leak detector tube.

c) Insert a ½” or ¾” hose into the leak detector tube and extend it all the way to the bottom of the leak detector tube. We recommend a transparent hose so you can see what is going on.

d) Let the other end of the hose on the ground to siphon the water out. You will have to prime the siphoning operation by sucking the air from the hose.

e) Let the water completely drain from the leak detector tube.

f) Alternatively, you may use a hand held pump to pump the water out of the leak detector tube. Either electric driven or manually operated pumps can do the job.

g) It will take some time for the water to drain from the outlying areas of the interstice to the leak detector tube. Therefore you may have to give time for the water to accumulate in the leak detector tube and you may have to repeat steps a) through f) a couple of times.

2. Using vacuum to remove the Water

a) If the tank has a communication nipple remove the cap (it may have been removed in 1.a. above) and check if the cap contains a slot in the threads that lets it breathe. If the communication nipple has a slot, replace the cap with a regular one and tighten it to make it airtight. Otherwise reinstall the cap and tighten it to make it airtight. Make sure you keep the original cap, as it will need to be reinstalled after you have finished the painting procedure.

CAUTION: Make sure you don’t accidentally attach the pressure side of the vacuum pump to the interstice, as you will cause the vault walls to fail or implode the primary tank if you over pressurize the secondary containment.

July 2008 Vacuum Painting page 1 of 7

b) Connect a vacuum pump to the leak detector tube using the system recommended in Figures 1 through 4. The clear tube inside the leak detector should extend to the bottom of the interstice. If you have a square leak detector tube, use Figure 4 in place of Figure 3.

When vacuum coating DO NOT pressurize the primary steel tank.

c) Surge Tank:

i) The small tank (surge tank) is placed in the middle of the system because you may have residual water in the interstice that will be squeezed out when the vacuum is applied. Most vacuum pumps warn you not to pump water, so this is a way to capture the water before it gets to the pump.

ii) If there is a lot of water, you will have to stop and empty the surge tank, and start over with the vacuum. It is best to shut off valve 2 before you empty the tank so you don’t lose all vacuum.

iii) Most people use a tank that is normally used to carry pressurized air around, but you could make one from large PVC pipe and caps. It will be under vacuum, so it won't explode.

iv) The tank also acts as a vacuum reservoir if there are leaks during the coating process.

d) The pressure side of the pump is generally just open to the atmosphere to release the air pumped from the interstice. Make sure you don't accidentally hook the pressure side of the pump to the interstice or you may destroy the ConVault.

CAUTION: You will cause the vault walls to fail if you over pressurize the secondary containment.

e) The vacuum pump we use is an older version of the GAST DOA-P707-FB (http://www.grainger.com/Grainger/items/4Z024), which can be purchased from Grainger. You don't have to use this model, but it is an option. Also available is Item# 5KA84, which can attain a higher vacuum but is more expensive.

http://www.grainger.com/Grainger/wwg/start.shtml

f) Close Valve 3 and open Valve1 and Valve 2. Start the vacuum pump and monitor the vacuum rise in the interstice. Gradually increase the vacuum in the annular space to 10 inches Hg. This may take only 30 seconds on a small tank. You will be able to hear the water entering the surge tank, and see the water moving through the clear tube as the vacuum pump starts pulling the water from the interstice.

g) Increase the vacuum to 10 inch HG and maintain the vacuum until you are no longer pulling any water or moisture from the interstice.

C. Thoroughly examine the tank’s finished concrete surface for cracks. Concrete cracks should be repaired and sealed in accordance with Convault guidelines.

July 2008 Vacuum Painting page 2 of 7 http://www.grainger.com/Grainger/items/4Z024 http://www.grainger.com/Grainger/wwg/start.shtml

D. Close Valve 3 and open Valve1 and Valve 2. Gradually increase the vacuum in the annular space to 10 inches Hg. This may take only 30 seconds on a small tank.

NOTE: We recommend 10 inches Hg vacuum. Excessive vacuum levels may cause nipples to pop up through the concrete or cause the spill containment to tilt, creating hairline cracks.

E. Close Valve 2, and shutdown the vacuum pump.

F. If necessary, use Valve 3 to reduce the vacuum by bleeding air into the annular space. Bring the vacuum down to 10 inches.

G. Apply nipple caulking and tank coating under 10 inch of vacuum. If vacuum falls below 5 inch, restart vacuum pump and bring the vacuum level back to 10 inch.

H. When caulking and coating is completed maintain the 10 inch of vacuum about 5 minutes and then disconnect the vacuum system from the tank

I. Reinstall and tighten the original cap on the communication nipple, and reinstall the original accessories on the leak detector tube.

July 2008 Vacuum Painting page 3 of 7 c ELASTOMERIC REPAINT PROCEDURES For CONVAULT TANKS

Detail Fig. 2

Vacuum Gauge

½” Clear Tubing

Vacuum Gauge

Thru Tank Leak Detector Tube

Valve 3 Valve 2

Secondary Containment Communication

½” Clear Tubing

Valve 1

Surge Tank / Portable Air Tank (Speedaire by Dayton Carry Tank, Model No. 4TK09 or similar)

Vacuum Pump (Gast DOA-P707-FB Model No. 4Z024 or equivalent)

FIGURE NO. 1

EQUIPMENT & PIPING ARRANGEMENT

July 2008 Vacuum Painting Page 4 of 7 http://www.grainger.com/Grainger/items/4TK09 http://www.grainger.com/Grainger/items/4Z024

Vacuum Gauge

Valve 2

Barbed connector for ½” Clear Tubing, or ¼” pipe nipple

Valve 3

¼” Tees and pipe nipples as needed

Connector Assembly as shown in Figure No. 3 (or Figure No. 4 for Square Leak Detector)

Top of Concrete

Top of Steel Tank

½” Clear Tubing to bottom of Leak Detector Tube

Thru Tank Leak Detector Tube FIGURE NO. 2

DETAIL

July 2008 Vacuum Painting page 5 of 7

1/4” Pipe threaded into reducer bushing

1” x 1/4” Reducer Bushing

2” x 1” x 1” Double Tap Bushing

2” Coupling 1” x 1/4” Reducer Bushing

1/4” Pipe threaded into reducer bushing

½” Clear Tubing Extended to Bottom of Leak Detector Tube

FIGURE NO. 3 Detail

LEAK DETECTOR TUBE

DETAILS OF TUBING CONNECTIONS

July 2008 Vacuum Painting page 6 of 7

This item works as an expansion plug. You must add enough washers so that when the Tee is tightened it pushes down the washers, compressing the rubber and forcing it out against the inside walls of the square leak detector tube. You may use the coupling on the bottom for minor adjustments.

¼” Pipe Nipple

¼” Pipe Coupling

½” Clear Tube extended to the bottom of the leak detector tube

Square Washer

1 ¼” Square Rubber Plug Must fit snugly in the square leak detector tube

Circular Washers

¼” Tee – See Figure 2

¾”

¼” Pipe with Threaded ends nipple passes through rubber plug

FIGURE NO. 4

TUBING CONNECTIONS TO SQUARE

LEAK DETECTOR TUBE

July 2008 Vacuum Painting page 7 of 7 c The Industry Leader In Above Ground Fuel Storage Systems

Dec 2007

DAP

DEVCON

PRODUCT INFORMATION

DAP - DEVCON PRODUCT INFORMATION Page 1 of 4 http://www.dap.com/product_details.aspx?product_id=18

DAP Products > Caulks and Sealants > Specialty Sealants

DAP® Concrete and Mortar Filler and Sealant

High performance, latex-based sealant formulated to repair cracks and holes in concrete, mortar and masonry. Contains silicone additives for improved adhesion and water resistance. Forms a durable, flexible and watertight seal. Resists gas, oil, grease and salt. Interior/exterior use. Paintable. Water clean-up.

Find a Retailer

Technical Information

1MSDS

1TDB

Case Code

Product Code

Unit Size Color UPC # Case

Pack Weight Dimensions

Cases/ Pallet MSDS

Tech Bulletin

18096 18021 10.1 fl.

oz.

Gray 7079818021 12 14 lbs. 8x6x12 108 10010 00010010 http://www.dap.com/product_categories.aspx http://www.dap.com/product_subcategories.aspx?catid=1 http://www.dap.com/products.aspx?subcatid=6 http://www.dap.com/rpm_poi.asp?frmInputProduct=18 http://www.dap.com/rpm_poi.asp?frmInputProduct=18 http://www.dap.com/docs/tech/00010010.pdf http://www.dap.com/docs/msds/10010.pdf http://www.dap.com/docs/tech/00010010.pdf http://www.dap.com/docs/msds/10010.pdf http://www.dap.com/docs/tech/00010010.pdf http://www.dap.com/docs/msds/10010.pdf http://www.dap.com/product_details.aspx?product_id=18

DAP - DEVCON PRODUCT INFORMATION Page 2 of 4 http://www.dap.com/product_details.aspx?product_id=398

DAP Products > Construction Adhesives > Specialty Adhesives

DAP® STRONGSTIK® Instant Grab Adhesive An instant grab adhesive that replaces nails and screws by holding projects in place instantly, yet it is repositionable for up to 15 minutes. Can be used for some vertical or overhead applications. Just one ounce can hold a three pound object. The slim 5.5 fluid ounce tube is easy to hold with a stand-up flip top cap for convenience. Works on most household surfaces and cleans up with soap & water. Indoor/Outdoor.

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Technical Information

2MSDS

2TDB

Case Code

Product Code

Unit Size Color UPC # Case

Pack Weight Dimensions

Cases/ Pallet MSDS Tech

Bulletin

01310 01310 5.5 fl.

oz.

White 7079801310 12 6.35 lbs. 9.44x7x4.75 225 00079983 00079983 http://www.dap.com/product_details.aspx?product_id=398 http://www.dap.com/product_categories.aspx http://www.dap.com/product_subcategories.aspx?catid=2 http://www.dap.com/products.aspx?subcatid=10 http://www.dap.com/rpm_poi.asp?frmInputProduct=398 http://www.dap.com/docs/tech/00079983.pdf http://www.dap.com/docs/msds/00079983.pdf http://www.dap.com/docs/msds/00079983.pdf http://www.dap.com/docs/tech/00079983.pdf http://www.dap.com/rpm_poi.asp?frmInputProduct=398 http://www.dap.com/docs/msds/10010.pdf http://www.dap.com/docs/tech/00010010.pdf

Devcon, a trademark of

ITW PERFORMANCE POLYMERS

(i) Consumer Division 2107 W. Blue Heron Blvd.

Riviera Beach, FL 33404 800-375-2525 / 561-845-2425

DAP - DEVCON PRODUCT INFORMATION 3 of 4 http://www.itwconsumer.com/catalog.aspx?prodID=205

b) FLOW-MIX® 5 MINUTE® EPOXY

State-of-the-art syringe automatically mixes epoxy hardener and resin during application. Eliminates hand mixing, messy clean up and the difficulty of applying to your surface. Comes with two Instant-Mix nozzles. Flow-Mix® 5 Minute® is:

High strength, 1,500 psi. Sets up in 5 minutes and dries clear, resistant to most chemicals. All purpose bonding and repairs.

Works best on metals, wood, concrete, ceramic, glass and china.

a. FLOW-MIX® 5 MINUTOS®

Jeringuilla moderna mezcla automáticamente la sustancia que sirve para endurecer epoxi y resina durante la aplicación.

Elimina tener que mezclar a mano, limpiar el area despues de uso y hace mas facil la aplicación a su superficie. Viene con dos boquillas. Gran potencia de adhesión, 1,500 psi. Seca en 5 minutos y es transparente, resiste la mayoría de los productos químicos. Para todo tipo de pegado y reparaciones. Funciona mejor en metales, madera, concreto, cerámica, cristal y porcelana. Disponible en tubos, Dev-Tube™ y botellas.

Find MSDS

PART NO. PACKAGE

20445 14 ml syinge carded w/2 auto mix nozzles

Click here to find a store that sells this product.

http://www.itwconsumer.com/wheretobuy.aspx?prodID=205 http://www.itwconsumer.com/wheretobuy.aspx?prodID=205

Devcon, a trademark of

ITW PERFORMANCE POLYMERS

(i) Consumer Division 2107 W. Blue Heron Blvd.

Riviera Beach, FL 33404 800-375-2525 / 561-845-2425

DAP - DEVCON PRODUCT INFORMATION 4 of 4

FLOW-MIX 5-Minute Epoxy Part #20445 Non Regulated Strength: 1500 psi Water-resistant: Yes Set color: Clear Chemical resistant: Yes Working/Set Time: 5 Minutes Flexible bond: No Can be handled in: 15 Minutes Full bond strength: 1 Hour Temperature effects: Not recommended above 200ºF (93ºC).

Works best on: Steel, Concrete, Fiberglass, Glass, Metal, Rubber

Application Information: Devcon’s exclusive FLOW-MIX applicator allows you to dispense mixed epoxy that can be applied directly to the surfaces to be glued.

1) Roughen, clean and dry surfaces to be bonded or repaired. Remove plastic storage cap from center of black plunger. 2) Turn nozzle end up and pull plunger back slightly (1/8”). Allow air bubbles to rise to top. Snap off and discard end of syringe.

3) Insert nozzle over opening and push past prongs. Rotate 90º to lock in place. (Note:

nozzle must be locked into place before pushing plunger.) 4) Push plunger evenly to dispense equal amounts of hardener and resin. Place nozzle directly onto work surface.

Run a line of epoxy on joint, crack or broken area to be repaired. Bond sets in 5 minutes and item can be handled in 15 minutes. Full strength in 1 hour. 5) Remove nozzle and discard. Wipe syringe end clean and snap on storage cap. Does not bond to Polyethylene or Polypropylene Plastics.

Removal Methods

Before it has hardened: Remove excess material immediately with damp cloth. Can also use mineral spirits.

After Cure:

Metal/Ceramic/Glass: Soak in hot water, if possible. Heat in excess of 350ºF will weaken adhesive. Solvents that can be used: Isopropyl alcohol, acetone, Methylene chloride, or other solvent.

Fabric/Wood: Before cure, flush fabric immediately with warm water or wipe wood with a damp cloth. It is not possible to remove cured epoxy from fabric. On wood, sand the cured material from the wood.

Eye Contact: Flush with water for 15 minutes & get medical attention.

Skin Contact: Remove with soap and water.

Inhalation: Remove to fresh air.

Ingestion: Get immediate medical attention.

EPDM

LIQUID RUBBER

EPDM Coatings LLC

The only Liquid EPDM in the world.

EPDM Coatings N.E Sales Office 494 Bridgeport Ave Suite 101

PMB# 342

Shelton CT 06484-4748 610-298-1989

EPDM Coatings PMB #342 494 Bridgeport Ave Suite 101 Shelton, CT 06484-4748 Phone 1-610-298-1989 Fax 702-977-2936 e-mail info@epdmcoatings.com Website http://www.epdmcoatings.com Blog http://liquidroof.blogspot.com

Customized fish pond coated with Liquid Rubber Before and After Picture of Application on Metal with rust. Rust (yes the application is safe for Fish!) did not need to be removed

EPDM Coatings PMB #342 494 Bridgeport Ave Suite 101 Shelton, CT 06484-4748 Phone 1-610-298-1989 Fax 702-977-2936 e-mail info@epdmcoatings.com Website http://www.epdmcoatings.com Blog http://liquidroof.blogspot.com

Liquid Rubber®, which is the ONLY liquid form of EPDM in the world, is a unique form of EPDM rubber. As a liquid, it can conform to any shape of surface, flashing or protrusion, vertical or horizontal, and can be applied easily with a paint brush or roller. When mixed with a catalyst it cures by chemical reaction to form a self adhering solid seamless rubber sheet.

Liquid Rubber® is a versatile coating for a broad range of applications. Its superior protective quality is derived from a unique combination of physical and chemical properties. Its EPDM chemistry provides for long durability, water resistance, a broad temperature tolerance and chemical resistance. As a chemically curing Liquid Rubber® it can form a flexible membrane up to 25 mils thick in one coat.

These properties enable Liquid Rubber® to be used as a one coat system on:

• Metal roofs

• Single ply rubber

• Hypalon and PVC membrane

• Steel and fiberglass siding

• Storage tanks

• Structural steel

• Lumber and plywood

• Concrete and masonry

The exposure environment can vary from high humidity to total immersion; constant or cyclic temperature changes from minus -60 F to 300 F or corrosive environments consisting of vapors, liquids and salt solutions.

Liquid Rubber® is an extremely effective corrosion preventive coating for steel and aluminum. It does not contain any leachable or sacrificial components so its protection does not diminish overtime.

The time needed for the Liquid Rubber® to solidify after it has been catalyzed will vary depending on the temperature. At least two days of cure time should be allotted for most applications. Stationary structures are therefore the most suitable for coating with Liquid Rubber®.

ENVIRONMENTAL IMPACT

Liquid Rubber® meets EPA's limits for volatile organic compounds (VOC) and the solvent contained in the product is not photochemically reactive. There are no leachable components which could contaminate surface of ground water. The greatest beneficial environmental impact, however, can be attributed to the long term durability of the product. This necessitates fewer recoats which translates into less total VOC emissions over the lifecycle of the coating.

CURE MECHANISM

Cross linking takes place at ambient temperatures. Free radicals resulting from the decomposition of the organic peroxide cause cross linking to take place at the DCPD sites. The rate, at which the peroxide decomposes, therefore, determines the rate at which the system will cure. This rate is determined by temperature and the availability of oxygen. Oxygen is necessary to activate a catalyst which promotes peroxide decomposition at lower temperatures. The cure mechanism in EPDM Liquid Rubber® will vary from active to inactive, determined by temperature. Faster cures and slow cures over extended periods of time result in identical physical properties.

Broad day-night temperature swings in spring and fall will not compromise the final physical properties of the Liquid Rubber® Membrane.

EPDM Coatings PMB #342 494 Bridgeport Ave Suite 101 Shelton, CT 06484-4748 Phone 1-610-298-1989 Fax 702-977-2936 e-mail info@epdmcoatings.com Website http://www.epdmcoatings.com Blog http://liquidroof.blogspot.com

• Extremely high resistance to penetration of water

• Ultra Violet and Ozone stable

• Excellent long term aging properties (i.e. retains its flexibility and elongation longer than other elastomers );

• Very broad temperature tolerance range [ from 300 degrees F to minus 62 degrees F]

• Acid and alkali resistant

• Resistant to polar solvents

• Withstands ponding water even when not cured

• Caution: Oils, fats and waxes will swell the polymer.

APPLICATION CHARACTERISTICS

The slow curing and non-polar nature of EPDM Liquid Rubber® give it outstanding surface wetting properties. The product does not fill cracks and crevices but will produce an even film penetrating even the smallest cracks and irregularities.

An example of this is, when EPDM Liquid Rubber® is applied over porous surfaces such as poured concrete, pinholes will appear on the surface as the material slowly displaces the air in the pores. This surface wetting feature enables the product to be applied in a single coat over non porous surfaces and still result in complete film integrity. EPDM Liquid Rubber® is hydrophobic in its liquid as well as the cured state and will withstand water immersion at any stage of its cure cycle. Liquid Rubber® should not be used where the material does not have exposure to oxygen such as between two impervious materials. When oxygen is available curing takes place from both top and bottom of film. There is sufficient oxygen available on most surfaces to initiate cure from the bottom. Oxygen readily penetrates films 20 mils thick. Curing is considerably retarded in thick films, however, cures do take place in thicknesses up to 75-80 mils within a three month period at temperatures over 70 degrees F. EPDM Liquid Rubber® can be applied to hot roof surfaces encountered during summer. The solvent in the system will flash off rapidly but the polymer will remain soft long enough to permit overlapping even after 1-2 hours.

On some materials, such as EPDM rubber sheets, some swelling may occur due to solvent absorptions after applying EPDM Liquid Rubber®. This is normal. Swelling will recover with time and heat. In 80° F or so, allow 7 to 14 days to recover. In colder temperatures, recovering will take several weeks, as much as 6 to 8 weeks in 60° F.

COMMERCIAL & INDUSTRIAL APPLICATIONS

Steel Siding for Buildings

EPDM rubber is an excellent recoat product for roll formed steel siding which is starting to corrode at the bends.

The rubber can be applied as one coat system with no corrosion inhibitive primer needed.

Fabricated steel in marine environments Cranes, tanks and support structures at dock facilities experience accelerated corrosion rates due to salt water exposure. EPDM rubber coatings are not affected by salt and are ideal for this type of environment.

Steel storage tanks Elevated or on ground steel storage tank can be effectively protected with a rubber coating. Surface condensation, cathodic protection nor thermal stresses between sun and shady areas present problems for the coating.

OUTSTANDING APPLICATION CHARACTERISTICS

EPDM Coatings PMB #342 494 Bridgeport Ave Suite 101 Shelton, CT 06484-4748 Phone 1-610-298-1989 Fax 702-977-2936 e-mail info@epdmcoatings.com Website http://www.epdmcoatings.com Blog http://liquidroof.blogspot.com

Concrete pipe and spill containments

EPDM rubber coatings are very effective for protecting concrete pipe against salt water corrosion.

They can tolerate higher temperatures, exposure to strong sun, and have 2.5 times higher solids than liquid Neoprene coatings.

Manual Application Procedures Liquid Rubber EPDM can be applied directly on many types of surfaces with solid, stable, nonporous and uniform surfaces such as flat roofs. For most surfaces, primers are not necessary. As an example, some types of surfaces that can be coated with Liquid Rubber EPDM are as below;

EPDM Rubber Sheets / Roofs -Galvanize Steel Panels / Roofs -Non-Polished Aluminum Sheets / Roofs -Steel Plates ( Painted, Unfinished, Light Corrosion ) Fiberglass Panels / Roofs -Wood & Plywood ( treaded with oil based primer ) Non-porous / steel troweled concrete surfaces / masonry

Though, Liquid Rubber EPDM can be applied using airless spray equipment, this document deals with manual applications – recommended for surfaces of less than 20,000 sq.ft. Please contact us for procedures on using spray equipment.

Besides flat and sloped surfaces Liquid Rubber EPDM has enough consistency so that it can also be applied on vertical walls / surfaces, to about 20 mils dft. or thinner per coat. The prime considerations when applying on sloping / vertical surfaces should be safety and falling hazards.

Planning

Work on days when rain is not expected, and in temperatures of 65 to 75 deg. F. for comfort. The curing process requires an ambient temperature of between 55 deg. F to 140 deg. F. As an estimate, you will need about 3 to 6 hrs to apply Liquid Rubber EPDM on a flat (horizontal) surface of 240 sq.ft. This does not include surface preparations time (cleaning the surface). Allow another16 to 20 hours after application, before the surface is dry to the touch and will take foot traffic.

Although Liquid Rubber EPDM will immediately waterproof, even when wet, avoid heavy rain until dry to the touch (16 – 20 hours after application). Pitting may occur otherwise. A full cure will be achieved in 4 – 10 days after application, in consistent 70 deg. F. ambient temperatures.