High pressure boiler tube chemical degreasing
1) chemical degreasing take the way of tank soak, in addition to the oil sump with steel production, the inner wall of the shop PVC or polyethylene.
2) Use of nitric acid of 12 to 15% (by volume) chemical degreasing treatment, a temperature of 40 ° C to 60 ° C, the time is 2 ~ 4 hours.
3) fittings in the tank soak should be noted placed to avoid tube memory remain air.
4) soaking process should move back and forth or flip up and down fittings, constantly changing, and in order to improve the effect of the lumen of the solution. Out of the necessary fittings, gas flushing with water after soaking.
5) chemical oil until the surface of the pipe is completely wetted by water.
Hot water rinse
1) degreasing fittings from the degreasing tank removed, immersed in 40 ℃ ~ 60 ℃ hot water tank rinsing time of 5 to 20 minutes.
2) heat sink with a steel plate, the inner wall of the shop PVC or polyethylene.
3) The chloride ion content in water is less than 25ppm.
High pressure boiler tube flush with water
1) hydroplaning washed fittings flush with the pressure of water (pressure P ≥ 0.1Mpa).
2) the chloride ion content in water is less than 25ppm.
Passivation
1) passivation pool slot bubble passivation liquid formulations and soaking time in accordance with either 2.3 table.
2) passivated the channel steel plate production, the inner wall of the shop acid resistant plastic.
3) immersion tank, you should pay attention to the placement position, avoid tube memory remain air.
4) soaking process should move back and forth or flip up and down fittings, constantly changing, and in order to improve the effect of the lumen of the solution. Out of the necessary fittings, gas flushing with water after soaking.
Dry
After passivation of the tube member, it is necessary to grasp the blown dry with clean air or nitrogen, and there must be sufficient time (at least 2 hours) to make it naturally in the air passivation.
High pressure boiler tube inspection
Passivated after the pipe, you should perform a self-test, mutual inspection, then submit quality inspector required for acceptance.
High pressure boiler tube protection
1) If the outer surface of the paint tube member, according to the coating requirements.
2) fittings with plastic plugs sealing, three anti-cloth bandage protection and inspection identified.
Post time: Oct-08-2019