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 TM 55-1905-223-24-3
(2)
Flush the tubes in the element with a solution of alkaline. After cleaning, flush several times with hot
water.
WARNING
The fumes from the solution are dangerous. Use the solution in open air or in a
room that has proper ventilation. Wear safety glasses and gloves.
(3)
Put the element into a container of solution made up of the following: 1 part muriatic acid, 9 parts
water, 1 pound (0.5 kg) oxalic acid, and 0.01 gallon (0.038 L) of pyridene added to each 5 gallons
(18.9 L) of muriatic acid.
(4)
Remove the element when there are no foam or bubbles in the solution. The foam and bubbles
normally stop in 30 to 60 seconds.
(5)
Put the element into a container that has a 5 percent solution of sodium carbonate. Remove the
element when there are no bubbles coming from the solution.
(6)
Flush the element with clean, warm water.
(7)
Visually inspect the element for damage. Replace if damaged.
c.
Clean the housing (12), support (5), and cover (14) with cleaning solvent.
d.
Inspect the following:
(1)
Check the cooler housing (12), support (5) and cover (14) for cracks, damage and corrosion (Figure
(2)
Check the cooler element for damage and leaks. Use the Part No. 3375253 Tube Bundle Tester
(a) Install the end plates to each end of the element.
(b) Put the sliding plate of the fixture so that the fixture will fit over the element and end plates, Figure 3-
13, left.
(c) Put the element into the fixture. Place the fixture so that the air connection fitting goes through the
notch in the fixture plate. Install locking clips into the bars of the fixture, Figure 3-13, right.
(d) Connect an air supply line that has a quick-disconnect fitting to the air connection fitting.
(e) Use an air pressure regulator and a three-way air discharge valve to control the air pressure.
(f) Apply 60 psi (414 kpa) of air pressure to the element.
3-38
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