Bulk Storage

Before any storage procedures are adopted for chelating agents, all personnel involved should be trained and practice the handling recommendations as specified in product Safety Data (SDS) sheets. In the United States and Canada, call 1-800-447-4369 to obtain Safety Data (SDS) sheets. In other global areas, call +1-989-832-1560. Or Contact Us directly through this web site.

The following recommendations apply to all DOW liquid chelating agents except the ammonium salts of EDTA, which should be stored in stainless steel.

Shipping

The liquid VERSENE* chelating agents are shipped in either lined steel or stainless steel tank trucks or tank cars. Any conventional method of unloading can be used. A typical method for unloading is included in this section. Suitable eye protection should be worn to prevent contact of the eyes with liquid VERSENE chelating agents. See the Safety Data Sheet for recommendations on specific products. In the United States and Canada, call 1-800-447-4369 to obtain Safety Data (SDS) sheets. In other global areas, call +1-989-832-1560. Or Contact Us directly through this web site.

Storage Tanks
Materials of Construction

The preferred materials of construction for storage tanks for VERSENE chelating agents are lined steel, stainless steel, or fiberglass reinforced plastic made with DERAKANE* vinyl ester resin. Aluminum, copper, and copper alloys must be avoided. Storage of VERSENE 100, VERSENEX* 80 or VERSENOL* 120 in aluminum may generate H2, an explosive gas.

If a lined steel tank is chosen for storage, DERAKANE vinyl ester resin, Amercoat 75¹, Epoxy Coat F², Phenoline 368/372³, Plasite 7570 or 7122⁴, Amercoat 85¹, or proven equivalent resin should be used as the lining. In preparing the inside surface for coating, all rough welds should be ground smooth, but do not necessarily have to be ground flush with the adjacent surface.

DERAKANE vinyl ester resins are well known by the reinforced plastics industry. Information on bulk storage fabricators experienced with these resins is available from The Dow Chemical Company, Midland, Michigan 48674. To learn more about DERAKANE vinyl ester resins, visit the DERAKANE web site.

Where contamination by iron or color does not present serious problems, mild steel tanks are acceptable for storage of the liquid VERSENE chelating agents.

Any rust or mill scale coming in contact with liquid VERSENE chelating agents will become loosened and removed, yielding a discolored product. The liquid VERSENE chelating agents are mild passivating agents which impart rust resistance to clean steel surfaces. For this reason, it is desirable initially to fill the tank completely with product in order to take advantage of this passivating effect.

Alkalinity of the liquid VERSENE chelating agents is important for this effect and corrosion resistance. The pH must never be reduced while the product is stored in mild steel equipment.

When the above precautions have been observed, the liquid VERSENE chelating agents can be stored in unlined steel tanks vented to the atmosphere. Under these storage conditions, a film of rust can form on surfaces above the level of the chelating agent, but not on surfaces consistently below this level.

Gas Blanketing

Storage conditions may be improved by utilizing a pad of nitrogen or some similar gas which is essentially free of acidic constituents (carbon dioxide or sulfur dioxide). This inert gas pad will reduce the possibility of rust formation and will provide the longest life for both product and equipment. Air or other gases should not be blown through the stored liquid. A pressure/vacuum relief valve will compensate for volume variance of the storage tank due to breathing.

Recommended Auxiliary Equipment
Pumps

A centrifugal pump constructed of type 304 stainless steel is recommended.

Pipes and Fitting

Pipes should be ASTM A-312 GR TP-304. Welds should be flush outside and inside, with pipe fully solution annealed, pickled, and passivated.

Valves should be gate valves of 316 stainless steel with a bolted bonnet and packing of Teflon⁵ resin.

The tank level indicator should be of the float type.

Tank mixing eductors should be Figure 268-B Schutte and Koerting Company or equivalent.

Filter

Construction should be of 304 stainless steel. A cartridge type such as Model 304 WKG-10-2F from Commercial Filter Corporation, or equivalent, is suggested.

Gaskets

Standard flat ring gaskets, 1/8" thick asbestos or equivalent, are suggested. Tape, 1/2" by 3 mils thickness made of Teflon resin or equivalent, is suggested for use as a joint compound.

Materials to Avoid

Brass, copper, most copper-containing alloys, galvanized iron, and aluminum are not suitable materials of construction for use in storage of liquid VERSENE chelating agents. Aluminum is especially unsuitable since it will react vigorously with the excess caustic in liquid chelating agent products to produce hydrogen gas, which is flammable and explosive.

Safety Data Sheets on the chelating agents are available from Dow and should be reviewed before handling these products. In the United States and Canada, call 1-800-447-4369 to obtain Safety Data (SDS) sheets. In other global areas, call +1-989-832-1560. Or Contact Us directly through this web site.

Customer Notice

Dow encourages its customers to review their applications of Dow products from the standpoint of human health and environmental quality. It is important that each customer ensure that Dow products are not used in ways for which they are not intended or tested.

¹ Product of Ameron Corp.
² Product of Napko Corp.
³ Product of Carboline
⁴ Product of Wisconsin Protective Coatings
⁵ Product of E.I. duPont de Nemours Company, Inc.

®™^* Trademark of The Dow Chemical Company ("Dow") or an affiliated company of Dow