INSTALL 2018 - Laserfiche WebLink

Home Browse Search

BALLASTING TANKS /TANK INSTALLATION Figure 9-7 10.7. Wet Hole-Add enough ballast to sink the tank. Ballast level inside the tank and in all Assemby compartments should be equal (to keep tank ...... level)and not more than 12"above the ground water level outside the tank(see Figure 10-1). Figure 10-1 Shap Stmp Deadmen 12"M ax. .Ar :18"-24"Backfill Bed (ADDING10. BALLASTING TANKS • 10.1. A tank is not adequately protected against flotation until the tank is backfilled to subgrade 1 and the top slab is in place. 10.2. For a tank that is not fully installed,water can Do not enter the tank excavation unless all OSHA enter the hole and the tank will float unless it has requirements arefollowed.Collapsing excavation walls been ballasted with fluid to offset buoyancy. may cause death or serious injury. 10.3. Use water or fluid heavier than water as ballast. Be sure the ballast will not contaminate the 11.1. Before You Begin product being stored or clean the tank before 11.1.1. It is important to review all instructions to product is added.This is especially important for make sure you are compliant with the proper potable water,chemical and diesel exhaust fluid procedures.This includes: (DEF)tanks. • Bed and Backfill 10.4. Do not make a direct(hard)connection of the • Pre-Installation Testing ballast Hill line to any tank fitting. Hole Size/Burial Depth 10.5. Adding ballast: Anchoring 11.2. Tank Vertical Diameter Measurements • 11.2.1. Each vertical diameter measurement is used Do not have the annular space connected to the to determine the tank's deflection.If at any primary space during ballasting or tank damage will point the deflection measurements exceed the occur. values in Table 11-1,stop the installation and contact Tank Technical Support. 11.2.2. During installation,vertical diameter measurements must be taken and recorded on When adding ballast, precautions must be taken so the Tank Installation Checklist after each of the that the tank cannot completelyfill.Keep tank vented following steps: to prevent pressurization of the tank when adding 11.2.2.1. "First Vertical Diameter Measurement" ballast. As the tank nears full, reduce the fill rate to • Placement of tank on backfill bed prevent sudden pressurization or tank damage will 11.2.2.2. "Second Vertical Diameter Measurement" occur. • Anchoring completed(only applicable if mechanical anchoring is used). 10.5.1. At the moment the tank is full,the pressure 11.2.2.3. "Third Vertical Diameter Measurement" in the fill line will result in an instant • Backfill to tank top. pressurization of the tank which will damage 11.2.2.4. "Fourth and Fifth Vertical Diameter the tank. Measurements" 10.5.2. This problem can be avoided by providing . Backfill to subgrade,before the concrete adequate tank venting or removing the fill pad. line and manually bringing the tank to full 11.2.3. Separate vertical diameter measurements capacity. must be recorded for each tank compartment. 10.6. Dry Hole-add ballast only after backfill is placed 11.2.3.1. All measurements for vertical deflection at least 75%of the tank diameter. are made from the bottom of the tank to the bottom of the fitting. 18