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SPACE • • ' 16.1. The load bearing capacity for a standard 22" 17.1.5. The standard monitoring fluid is a calcium manway installed is 1,200 lbs.for single-wall chloride in water with a biodegradable green tanks and 2,400 lbs.for double-wall tanks. tint. 16.2. All 30"and 36"manways have load bearing 17.1.6. Add brine to the reservoir until the fluid capacity of 2,400 lbs. level matches the following table values 16.3. Do not exceed 50 ft./Ib.torque during bolt in Table 17-1: tightening or manway flange damage may 17.1.7. During or after,if the reservoir sensor indicates occur. a high or low level alarm,it is necessary to first determine that the alarm is not the result of an 17. TANK ANNULAR SPACE MONITORING incorrect initial fluid level setting. 17.1. Hydrostatic Monitoring 17.1.7.1. Remove the sensor. 17.1.1. Because of its superior leak detection 17.1.7.2. Test the sensor for proper operation. capability,Containment Solutions 17.1.7.3. Check that the float sensor is positioned recommends the Hydrostatic Tank Monitor for on the tank top.The bottom float should continuous monitoring of the annular space. be within 2"of the bottom and floats are However,the tank owner or the tank owner's spaced a minimum of 11"apart. representative is responsible for selecting the 17,1.7.4. Reset the fluid level in the reservoir by monitoring system. adding or removing fluid as indicated 17.1.2. Tanks with hydrostatic monitoring systems in Table 17-1. normally arrive with monitoring fluid installed 17.1.7.5. Reinstall the sensor. in the annular space and some fluid in the reservoir. 17.2. Note:If a second alarm occurs,additional 17.1.2.1. After installation,the fluid level in the instructions for setting the brine level are reservoir must be filled to the proper available from Containment Solutions Field Services. level. 17.1.2.2. Additional monitoring fluid is supplied TABLE 17-1 with the tank for this purpose. Tank Diameter Reservoir Fluid Level Measurement &Capacity Tankis Empty Tankis Half Full Tank is Full Hydrostatic monitoring space between the inner 4'(1M and less) 51/4" 7" 8s/4" and outer tank must be vented to the atmosphere.If 4'(over 1M) 41/4" 43/4" 5" unvented,pressure buildup can cause tank damage. 6'(6M and less) 4" 41/4° 51h" 6'(over 6M) 31/2 43/4" 6" 17.1.3. Vent annular space with a minimum 1/4"hole at 8'(6M and less) 41/4" 41/4" 51/4" riser top. 17.1.4. When installing a double float sensor,the 8'(over 6M) 41/4" s" 6" bottom of the sensor must be in contact with 10'02M and less) 4th" 51/4" 6" the tank top(see Figure 17-1). 10'(13Mthru 20M) 51/4" 6th" 8" Figure 17-1 10'(21M thm 35M) 33/4" 6th" 91W" Concrete Traffic Pad 10'(36M thru 50M) 4" 53/4" 7t/2" 12'(25M and less) 4" 61h" 91/4 Riser Pipe &Cap Fitting 12'(26Mthru40M) 41A 51/4" 71/4" w/Minimum 1/"Vent Hole Double Float 12'(41M thru 50M) 31/2' 53/4" 8" Reservor Sensor Reservoir High Level Alarm 17.3. Dry Annular Space Monitoring Monitoring with Sensor Fluid �'� Low Level Alarm 17.3.1. Consult monitoring equipment manufacturer for proper installation. 17.3.2. When liquid or vapor sensors are used,the or Contact tank may be sloped at time of installation. w/Tank Top 17.3.3. If tank is sloped,place tank so that the lowest elevation is at monitoring end. Always safety lasses and protective clothing 173.4. Calibration charts are designed for level tank Y y 9 p g installation.Sloped tanks will affect the tank when handling monitoring fluid. Monitoring fluid calibration chart accuracy. spillage may cause surfaces to be slippery. Refer to MSDS sheet for additional information. 23