Anode bag.

Measuring Tank-to-Soil Cathodic Protection Potentials On Propane Tanks

Equipment: Digital Voltmeter, Test leads, Reference Electrode (Copper/Copper Sulfate half cell)

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STEP 1:

Using a digital voltmeter select the 2 volt DC scale, Contact red test lead to the tank test point or an uncoated metallic area of the tank, preferably to the uncoated fill pipe. (Do not connect to shroud.) Note: If using a two-input analog meter, black lead will be connected to tank.

STEP 2:

Contact the black test lead from the meter to a charged reference electrode. (see charging electrode below) Note: If using a two-input analog meter, contact red lead to reference electrode.

STEP 3:

Remove protective cap from porous plug at bottom end of electrode. Place porous plug end into native earth directly above buried tank. Moisten soil with water or dig plug into soil if difficulty is encountered obtaining a reading.

STEP 4:

Observe meter reading and record. Reading should be at least -.850v or above. For other applicable criteria refer to NACE Standards RP0285-95 and RP0169-96, Corrosion Control of Underground Storage Tank Systems and Control of External Corrosion on Underground or Submerged Metallic Piping Systems. Note: It is recognized through NACE that all readings be recorded as negative.

Charging Charging Reference Electrode:

STEP 1:

Unscrew and remove porous plug end of new reference electrode. Add deionized or distilled water to the copper sulfate crystals, filling electrode completely. The solution will turn blue in color and there should always be excess crystals at the bottom of the tube. DO NOT USE TAP WATER.

STEP 2:

Replace porous plug end of electrode and place in an upright position so that the porous plug end is facing in the down position and let stand for 15 minutes before use. This will allow the porous plug to become completely saturated before use. Caution: Do not allow electrode to contact oil, road salts, or other substances that may contaminate the solution by absorption through porous plug.

Do not allow electrode to freeze.

PRESSURE FACTORS

POSITIVE DISPLACEMENT METER

Always caution Customers to open Inlet & Outlet valves extremely slowly when using elevated pressure.

POUNDS FACTOR POUNDS FACTOR POUNDS FACTOR POUNDS FACTOR
0 0.998 20 2.34 40 3.69 60 5.05
1 1.05 21 2.4 41 3.76 61 5.12
2 1.11 22 2.47 42 3.83 62 5.19
3 1.18 23 2.54 43 3.9 63 5.26
4 1.25 24 2.61 44 3.97 64 5.32
5 1.32 25 2.68 45 4.03 65 5.39
6 1.39 26 2.74 46 4.1 66 5.46
7 1.45 27 2.81 47 4.17 67 5.53
8 1.52 28 2.88 48 4.24 68 5.59
9 1.59 29 2.95 49 4.3 69 5.66
10 1.66 30 3.01 50 4.37 70 5.73
11 1.72 31 3.08 51 4.44 71 5.8
12 1.79 32 3.15 52 4.51 72 5.87
13 1.86 33 3.22 53 4.58 73 5.93
14 1.93 34 3.29 54 4.64 74 6
15 2 35 3.35 55 4.71 75 6.07
16 2.06 36 3.42 56 4.78 76 6.14
17 2.13 37 3.49 57 4.85 77 6.21
18 2.2 38 3.56 58 4.92 78 6.27
19 2.27 39 3.63 59 4.98 79 6.34
            80 6.41

To convert to gallons multiply cubic feet by the lbs factor, and then divide the result by 36.28


 

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