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Optional A,„issorles For Hydrostatic Tank Monitoring Antifreeze Mixtures O/C Tanks recommends and supplies the Hydrostatic Tank Monitor for use with Fiberglas double-wall tanks (Models DWT -2P and DWT -413). If the Hydrostatic Tank Monitor is used in areas of the country where ambient temperatures or delivered product temper - freezing conditions, an anti- freeze solution must be used to avoid potential tank damage. Chemically acceptable anti- freeze solutions include ethylene glycol (automotive antifreeze), propylene glycol (food grade antifreeze), and calcium chloride (non-toxic brine). However, before selecting the antifreeze solution, consult local environmental codes for possible restrictions—particu- larly if ethylene glycol is used. Brine Antifreeze Solution As an optional accessory, O/C Tanks can supply a calcium chloride solution which is pre- mixed and blended to provide freeze protection to -40° F. The Brine Antifreeze is non- toxic and is often a lower cost alternative to the other com- mercially available antifreeze solutions. Glycol Antifreeze Solutions A mixture of water and either 0hvi :nz glycol or propylene glycol (contractor provided) is r; -mate to provide pro - again stn st freezing. Local u; environmental codes she be reviewed for chemical ~ acceptability—particularly if ethylene glycol is used. Ethyl- eneglycol is usually less gxpen- sive than propylene glycol. A minimum of 30% ethylene glycol or 35% propylene glycol and water solution is recommended. At or above these minimum glycol concen- trations, an antifreeze mixture which freezes will contract in volume, thus preventing damage to the monitoring components, tank and piping. Do not use more than 75% glycol. Water Paste Detection To detect water in the tank bottom, water detection paste equipment distributors. How- ever, some water detection paste cannot detect antifreeze mixtures. If antifreeze mix- tures are used for the cavity monitoring fluid, the following product is capable of detecting water or antifreeze (brine or up to 50% glycol) solution in the tank water bottoms: WATER FINDER #7686-1870 DAYCO/NATIONAL DAYTON, OHIO Fiberglas° Reservoir Sensor All Model DWT -2P and DWT - 4P tanks include a Fiberglas reservoir mounted on the tank top as a standard feature. After filling with liquid, the level in the Fiberglas reservoir may be monitored periodically by using a dipstick or con- tinuously by using the optional reservoir sensor, in conjunc- tion with an optional electronic control panel. The monitoring sensor is placed into the Fiberglas reservoir through a 4" riser pipe from grade. The sensor includes the riser pipe cap with a 16" length of flexible conduit, which is connected to an electrical junction box (con- tractor supplied). The reser- voir sensor has sufficient cable length for a maximum tank burial depth of 10' from the tank top to grade. The reservoir sensor operates on the principle of conduc- of liquid in the Fiberglas reser- voir. Under normal conditions, the titanium metal probes will be immersed in the liquid media, thereby completing the electrical sensing circuit (nor- mally closed). If the reservoir liquid level drains and exposes the sensor probes, an alarm will sound at the electronic control panel_ Reservoir Sensor Freeze Glycol Mixture Protection - (with water) 20°F 20% 0°F 30% -20°F 40% -40°F 50% Water Paste Detection To detect water in the tank bottom, water detection paste equipment distributors. How- ever, some water detection paste cannot detect antifreeze mixtures. If antifreeze mix- tures are used for the cavity monitoring fluid, the following product is capable of detecting water or antifreeze (brine or up to 50% glycol) solution in the tank water bottoms: WATER FINDER #7686-1870 DAYCO/NATIONAL DAYTON, OHIO Fiberglas° Reservoir Sensor All Model DWT -2P and DWT - 4P tanks include a Fiberglas reservoir mounted on the tank top as a standard feature. After filling with liquid, the level in the Fiberglas reservoir may be monitored periodically by using a dipstick or con- tinuously by using the optional reservoir sensor, in conjunc- tion with an optional electronic control panel. The monitoring sensor is placed into the Fiberglas reservoir through a 4" riser pipe from grade. The sensor includes the riser pipe cap with a 16" length of flexible conduit, which is connected to an electrical junction box (con- tractor supplied). The reser- voir sensor has sufficient cable length for a maximum tank burial depth of 10' from the tank top to grade. The reservoir sensor operates on the principle of conduc- of liquid in the Fiberglas reser- voir. Under normal conditions, the titanium metal probes will be immersed in the liquid media, thereby completing the electrical sensing circuit (nor- mally closed). If the reservoir liquid level drains and exposes the sensor probes, an alarm will sound at the electronic control panel_ Reservoir Sensor Model RSIQ Shown Flexible cum Adjustable lead cable WM holes High kqud Riser pipe Vvel switch cap Low liquid level switch 4" Diarrrttte �r—�� 1 ,threaded . ,/ tstable `°tire ptas!ic c a ;N