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0 <br />been sandblasted to White Metal, it shall be brushed with clean brushes <br />made of hair, bristle or fiber, blown off with compressed air or cleaned by <br />vacuum. Adequate separators and traps shall be used to remove oil and <br />water from compressed air. The blast cleaned surface shall be coated within 8 <br />hours after blasting when practical. But in any event, not later than 24 hours <br />after blasting and also before any visible rusting occurs. Contact Bridgeport <br />Chemical Corporation for recommended sandblasting equipment and <br />procedures. <br />After sandblasting, all perforations and or open/split seams shall be permanently repaired as <br />follows - <br />a. All holes less than 3/4" diameter shall be plugged with plugs or screws made of non- <br />corrosive plastic (e.g. nylon or teflon). The plugs shall be covered with Glass Armor <br />and fiberglass cloth, which overlaps all sides of the plug a minimum of 2". <br />b. Holes up to 11/2" diameter shall first be plugged with either steel or plastic plugs. In <br />addition, a 6"x6" steel plate (10 gauge min.) must be placed over the flattened plug and <br />extend all sides by 2". This steel plate shall be sandblasted to white metal on both <br />sides and bonded to the tank with Glass Armor epoxy. A laminate of epoxy and <br />fiberglass cloth shall cover this plate on all sides by a minimum of 2". <br />c. An open or split seam (less than 3" long) shall be repaired using either fiberglass or <br />steel plate epoxied in place and overlapping the seam by a minimum of 6" on all sides. <br />Sandblasting Safety Precautions: <br />1. Blast operators shall wear U.S. Bureau of Mines approved helmet connected to a <br />source of clean compressed air. <br />2. Blast hose shall be grounded to dissipate static charges. <br />7-5 Application of GA27 P Protective Coating <br />GA27 P is a specially developed heavy built coating, designed specifically for special <br />spray equipment which makes the coating easily applicable. A GA27 P unit will cover 40 square <br />feet at approximately 125 mil thickness. The following procedure should be carefully followed. <br />1. Prepare the substrate for coating. <br />2. To assure the proper coverage, the tank must be marked off with chalk into 40 square <br />foot sections. <br />3. Mix activator and resin for 3 minutes using mixing blade #A275. Scrape sides of can <br />with a long pointed trowel and mix for another minute, total mixing time, 4 minutes. <br />Material must be thoroughly mixed and uniform in color. <br />Pa ee A 9 Q'I <br />