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Gas Station Construction and Maintenance, Petroleum systems Contractor Nevada and Arizona_7

Tham khảo tài liệu 'gas station construction and maintenance, petroleum systems contractor nevada and arizona_7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Simpo PDF Merge and Split Unregistered Version - http www.simpopdf.com UFC 3-460-03 21 JANUARY 2003 7.3.1.3. Seals on aboveground open-top floating-roof tanks are subject to deterioration by atmospheric conditions. The following maintenance services are recommended and are performed at intervals as outlined in paragraph 10.6.2 7.3.1.3.1. Brush the fabric clamps and bolts with a nonferrous wire brush to remove rust and scale. 7.3.1.3.2. Replace deteriorated or defective bolts tighten loose bolts and clamps. 7.3.1.3.3. Thoroughly clean fabric surfaces with cleansing solvent. 7.3.1.3.4. Apply one or more coats of a white elastomeric coating compatible with neoprene to the fabric clamps and bolts. 7.3.2. Belowground Tank Maintenance. 7.3.2.1. Inspection is limited to those portions of tank and lines that are exposed inside manhole vaults and pits. Inspect these exposed surfaces periodically for corrosion and chips repaint if necessary. 7.3.2.2. Interior surface maintenance including inspection for sludge deposits and corrosion must be on a scheduled recurring basis according to requirements in paragraph 10.6. In cleaning interior surfaces follow the procedure given in Chapter 11. 7.3.2.3. Operating storage tanks with below-grade access ways must have one manhole enlarged to 0.91 meter 36 inches in diameter and extended at least 203 millimeters above grade. Include ladder rungs at the access way that extend to the floor. 7.3.2.4. For quality control reasons the requirement for the slotted-gauge pipe in operating storage tanks has been deleted from Air Force standard designs. The portion of the gauge pipe inside the tank must be removed at the tank shell as soon as possible. Newer tanks may have a slotted stainless steel stilling well for gauging and sampling wells. 7.3.2.5. Perform touch-up painting as required. Use applicable portions of Navy Guide Specification Section 09973. Surface preparation is the key to a good job. 7.4. Pressure Vacuum Vents. 7.4.1. Description