TANK CLEANERS
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TC#4 - Tank Cleaner
Description
TC#4 tank cleaner is a superior hydrophilic, solvent emulsifying detergent for cleaning and gas-freeing cargo tanks that have been contaminated with petroleum residues. TC#4 cleaner can be used diluted or neat for cleaning cargo tanks, deep tanks, and bilges. It is safe for most tank coatings and can be applied to any of the standard tank cleaning methods including rock-and-roll, machine cleaning or hand spraying.
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Features |
Benefits |
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Solvent emulsifying cleaner |
Reduces cleaning time Minimizes downtime Reduces manual cleaning |
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Concentrated |
Effective in machine and manual spraying and rock-and-roll cleaning procedures Easy to apply Cost effective |
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Contains no chlorinated hydrocarbons |
Does not hinder rerefining of oil slops |
Application and Use
The following tank cleaning instructions are not intended to interfere with the judgment of the Master, Chief Mate, or Chief Engineer in the operation and/or navigation of the vessel. They are meant only as a guide since circumstances, such as the degree and nature of contamination, reason for cleaning, heat and time available, crew experience, tank configuration and sea conditions will vary for each tank cleaning, and all must be taken into consideration. The recommendations provided are designed to achieve the optimum results and are based on over 40 years of tank cleaning experience.
I. Cleaning and gas freeing double bottom and deep tanks by the rock-and-roll method
A. General Information
Estimated dosage requirements are listed in Table I. The amount and nature of contamination, the available heating facilities, and the sea conditions must be taken into consideration in determining which dosage schedule to follow.
B. Cleaning Procedures
The following procedure is recommended to obtain maximum efficiency when cleaning and gas-freeing tanks at sea.
1) Strip tanks of fuel by heating with the steam coils and/or steamout lines. Trim vessel to obtain maximum suction for stripping.
2) With heat on full, flush tanks forward to aft with seawater and maintain continuous stripping for one hour.
3) Fill tanks to 25% capacity with seawater and apply full heat. Maintain this condition for a minimum of 12 hours and then strip.
4) After losing suction, commence to flush tanks while maintaining suction with seawater for one hour.
5) Secure stripping operations and dose the proper amount of TC#4 cleaner for the first cleaning step through the sounding/vent pipe using the appropriate dosage schedule outlined in Table
I.
Schedule A - Normal dosage 190 liters (approx. 50 U.S. gallons) TC#4 cleaner per 100 tons tank capacity when:
• Sludge conditions are normal.
• Heating facilities are capable of heating a full tank of water to a minimum of 38° C (100° F). Schedule B - Enriched dosage 300 liters (approx. 80 U.S. gallons) TC#4TM cleaner per 100 tons tank capacity when:
• Tank contain excessive amounts of sludge.
• Heating facilities are not capable of heating a full tank of water to a minimum of 38° C (100° F).
6) After adding the first dose recommended in the appropriate schedule, fill each tank to one- quarter capacity with seawater. Apply full heat and raise the solution temperature to 38° C (100° F), if possible.
7) Maintain this condition for one day. Then raise the level in the tanks to 95% of capacity by further addition of seawater. Continue heating for another day. If the sea is calm, be sure tanks are full enough so that the overheads will be in contact with the cleaning solution.
8) After the second day, strip the contents of the tanks. If time permits, refill the tanks to 90-95% capacity with seawater maintaining full heat.
Again, strip the contents with heat still on coils.
After losing suction, flush tanks with seawater and maintain surface suction for one hour.
9) Secure the flushing operations and add the second dose of TC#4 cleaner using the same schedule as the first. Fill the tanks to 95% capacity with seawater and apply full heat. Maintain this condition for a minimum of one day and longer, if time permits.
10) After one or more days, strip the contents of the tanks. Refill to 90-95% capacity with seawater maintaining full heat. Strip the contents of the tanks with full heat on. After losing suction, flush with seawater and maintain surface suction for one hour.
11) To gas free, add seawater through the sounding or vent pipe and press up the tanks completely to overflowing.
12) Completely strip the tanks, trimming the vessel to insure complete removal of water.
13) Test tank atmosphere with appropriate gas testing equipment.
14) If the tanks are to be ballasted upon completion of cleaning, add the ballast water with a fire hose through the sounding or vent pipe to prevent recontamination.
II. Cleaning oil from bilges by the rock-and-roll method
A. Determine the amount of water required to fill the bilge to a level, which provides complete coverage of all areas requiring cleaning. Based on the amount of water required, from Table II determine the necessary dose of TC#4 tank cleaner.
Example:
Bilge area 23 x 23 meters (75 x 75 feet).
Average depth of water 0.3 meters (1 foot). Total cubic meters of water in bilge equals 23 x 23 x 0.3 or 159 cubic meters (5625 cubic feet). Refer to Table
II for nearest dosage of TC#4 cleaner.
B. Dosage should be distributed at various points in the bilge directly from the container.
C. Add the required amount of seawater to the bilge, and allow the natural motion of the vessel to provide agitation for a minimum of 24 hours.
D. At the end of 24 hours, pump bilge dry, and if required, repeat treatment.
III. Cleaning tanks by machine cleaning
A. General
As with any cleaning, the amount of chemical required is related to a number of variables. For machine cleaning of tanks with TC#4 cleaner, special consideration must be given to the following:
1) Number and size of tanks
2) Quantity of water and pressure available
3) Tank structure
4) Number and condition of tank cleaning machines
5) Machine characteristics and cycle time
6) Degree of cleanliness required
B. Cleaning Procedure - Direct Chemical Injection
1) Prepare and inspect all equipment.
2) To calculate the quantity of chemical (Qd) necessary, the following information is required:
P = Quantity of chemical to be used per ton of water (1 liter/ton, i.e., solution strength 0.1%).
M= Number of machines to be used per tank
C = Output of each machine (tons/hour)
T = Total time to clean the tank (hours)
Qd= P x M x C x T
3) Introduce TC#4TM tank cleaner directly into the tank wash water line by means of an eductor or small metering pump. Adjust the feed rate to give the correct solution strength.
4) The tank should be stripped continuously while washing.
5) Rinse the tank with ambient temperature water immediately.
6) If necessary, spot clean manually to remove any patches of soil material that may remain after cleaning.
C. Cleaning Procedure - Recirculation Method
For this method, a solution of seawater and TC#4 cleaner is mixed in a slop or cargo tank. The solution strength depends upon the quantity of water required to circulate the system and maintain adequate suction at the pumps.
1) While filling the recirculation tank with water, add the amount of TC#4 cleaner required for correct solution strength. To estimate the required chemical (Qr), use the formula listed below.
Qr (Quantity recirculation) = 1.25-1.4 liters of TC#4 cleaner per ton of water
In the recirculation cleaning, the very nature of the method does not lend to efficient use of the product, and each batch of solution “mixed” will not perform as efficiently as will the cleaner when introduced directly into the tank cleaning water. For this reason, the total quantity of product estimated should be increased by between 25% and 40% over the direct injection method to produce equivalent results.
2) The procedure is the same as for the direct injection method except for the fact that the tanks being washed are stripped back to the recirculation tank. Care should be taken to observe when TC#4 cleaning solution is saturated.
IV. Cleaning Procedure - Spot Cleaning
A. To calculate the amount of TC#4 cleaner of a known area:
Qs (Quantity Spot Cleaning) = area in square meters x 0.20
B. To calculate the amount of TC#4 cleaner to do an entire tank by hand or lance spraying:
Q1 (Quantity Hand Cleaning) = Volume in cubic meters (tons) x 0.15
Typical Physical Properties
Appearance: Clear, light amber liquid
Specific Gravity at 25° C (77° F): 0.86
Flash Point (PMCC): 65.5° C (150° F)
Packaging
TC#4 tank cleaner is available in 25-liter and 200-liter containers.
Important Information
Ashland maintains Material Safety Data Sheets on all of its products. Material Safety Data Sheets contain health and safety information for your development of appropriate product handling procedures to protect your employees and customers.
Our Material Safety Data Sheets should be read and understood by all of your supervisory personnel and employees before using Ashland products in your facilities.
TABLE I
TANK CAPACITY |
TC#4 CLEANER DOSAGE (LITERS) |
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SCHEDULE A |
SCHEDULE B |
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NORMAL |
ENRICHED |
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Solution Temperature |
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38° C (100° F) or above |
between 15° C (60° F) and |
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TONS |
BARRELS |
FIRST |
SECOND |
TOTAL |
FIRST |
SECOND |
TOTAL |
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10 |
66 |
13 |
6 |
19 |
19 |
11 |
30 |
|
15 |
99 |
20 |
8 |
28 |
28 |
16 |
44 |
|
20 |
132 |
26 |
11 |
37 |
38 |
23 |
61 |
|
25 |
165 |
33 |
14 |
47 |
47 |
28 |
75 |
|
30 |
198 |
40 |
17 |
57 |
57 |
34 |
91 |
|
35 |
231 |
46 |
20 |
66 |
66 |
40 |
104 |
|
40 |
264 |
53 |
23 |
76 |
76 |
45 |
121 |
|
45 |
297 |
60 |
26 |
86 |
85 |
51 |
136 |
|
50 |
330 |
66 |
28 |
94 |
95 |
57 |
152 |
|
55 |
363 |
73 |
31 |
104 |
105 |
65 |
170 |
|
60 |
396 |
80 |
34 |
114 |
114 |
68 |
182 |
|
65 |
429 |
86 |
37 |
123 |
123 |
74 |
197 |
|
70 |
462 |
93 |
40 |
133 |
132 |
80 |
212 |
|
75 |
495 |
100 |
43 |
143 |
142 |
85 |
227 |
|
80 |
528 |
106 |
45 |
151 |
151 |
91 |
242 |
|
85 |
561 |
113 |
48 |
161 |
161 |
97 |
258 |
|
90 |
594 |
119 |
51 |
170 |
170 |
102 |
272 |
|
95 |
627 |
126 |
54 |
180 |
180 |
108 |
288 |
|
100 |
660 |
132 |
57 |
189 |
190 |
113 |
303 |
|
125 |
825 |
166 |
71 |
237 |
237 |
143 |
380 |
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150 |
990 |
200 |
85 |
285 |
284 |
170 |
454 |
|
175 |
1155 |
232 |
100 |
332 |
330 |
200 |
530 |
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200 |
1320 |
265 |
115 |
380 |
378 |
227 |
605 |
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1000 |
6600 |
1325 |
565 |
1890 |
1890 |
1135 |
3025 |
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NOTE: 1000 liters = 1 ton |
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TABLE II |
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BILGE CAPACITY |
TC#4 CLEANER DOSAGE |
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CU. FT. |
GALLONS |
CU. METERS |
LITERS |
U.S. GAL. |
LITERS |
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2000 |
14,960 |
56 |
56,000 |
7 |
26 |
|
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2400 |
17,900 |
68 |
68,000 |
8 |
30 |
|
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3000 |
22,400 |
85 |
85,000 |
10 |
38 |
|
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3600 |
26,900 |
102 |
102,000 |
12 |
45 |
|
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4200 |
31,400 |
119 |
119,000 |
14 |
53 |
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4800 |
35,000 |
136 |
136,000 |
16 |
60 |
|
|
5400 |
40,400 |
153 |
153,000 |
18 |
68 |
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|
6000 |
44,880 |
170 |
170,000 |
20 |
75 |
|
|
6600 |
49,368 |
187 |
187,000 |
22 |
83 |
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|
7200 |
53,856 |
204 |
204,000 |
24 |
90 |
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7800 |
58,340 |
221 |
221,000 |
26 |
98 |
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8400 |
62,832 |
238 |
238,000 |
28 |
106 |
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