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VI. Inspections of flow system and equipment problems
As a qualified operator you need to know the following:
1. What is the normal material?
2. How to operate the equipment?
3. What is the normal operation situation of the equipment?
4. What is the flow direction of the raw materials in the equipment?
6.1 Inspection of abnormal display of raw material pressure gauge:
Maintenance must be conducted sequentially and started from the first step. And it should be determined by
the number showed in the raw materials pressure gauge. Due to the different raw materials, temperature
and viscosity, so the equivalent value in the pressure gauge of the feed pump and host is not necessary, the
pressure value of the air source can be adjusted according to the operating speed of the feed pump.
Step 1, to determine what kind of raw materials are missing or disappeared.
First of all, observe the color of raw materials and foam out of the gun, and stop operation and check the gun
when found any problems. When one of pipeline lack of raw materials which can contribute to low pressure
of raw materials showed by the pressure gauge, this phenomenon indicates that there are sufficient materials
supplying among each feeding systems, so it is necessary to check whether there is obstruction or lack of raw
materials in the barrels.
Step 2, for lack of materials in one of pipelines caused by sufficient materials supplying, inspection and repair
work should be started from the farthest end of the host and from the most basic and easily noticeable
aspects.
Step 3,To the low number showed in the pressure gauge of raw materials, the following aspects should be
checked:
1. Whether there are raw materials in the barrels?
2. What is the temperature of raw materials?
a. A high temperature may result in premature expansion of foaming agent F-11 inside the
polyol bucket. (if F11 foaming agent is used)
b. Too low temperature at the bottom of the barrels of raw materials will lead to increased
viscosity resulting in feed pump blocked or impeded flow of raw materials which can block
raw materials entering into the system.
3. For feed pump, see "operating guide of feed pump"
(A) Whether or not in running?
(B) Whether the air source valve being switched on?
(C) Whether the pressure of air source has been adjusted to an appropriate value?
(D) Whether there is dirt in the shaft of the ISO lifting pump of isocyanate? (If there is
dirt, it indicated that the shaft has not been lubricating protection in advance, or
there is no lock of lubricating fluid cup J10038-81, resulting in materials spilling).
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