What’s more, the filter housing must be covered by a packing membrane on every corner before being put into the carton/case. Scratches can be avoided to keep the filters in good status when customers receive them.
There is one more tip for you when your cartridge filter housings are equipped with outside painting, please check with the supplier whether they have put one more extra small tank of painting inside the package.
Because some marks or defects might be caused on the finishing surface when unloading the cartridge filter housing to the operation site. It will be easy to repair if you have the same color painting on hand. This convenience service will also help you to gain more satisfaction from your cartridge filter housing end users.
Second step: Product checking
Now let’s move on to the real challenge, the whole checking, and testing for cartridge filter housing. It will take some time and effort to accomplish the checking process, but for the perfect filtration performance, it is worth doing.
Hydro test report
After welding, very cartridge filter housing will go through a hydro test under a pressure even larger than the design pressure for a fixed period after. It is for the assurance that no leakage problem and complete integrity sealing under the expected operating environment. It is important and essential to archive all the test reports and videos, which are the best evidence to show the performance of the filter housing.
Inspection for welding procedure
Communicate with the manufacturer timely, if a root opening needs to be left. If the root opening is too tight, an inadequate penetration can be caused. However, a larger root opening can cause an over-penetration.
Same principle to the groove angles. If groove angles are too small, may cause a lack of fusion, and if too large, can result in distortion of the weld joint from overheating and excessive shrinkage stress.
Check the physical appearance of the weld seam. The good weld seam is continuous, average, and neat like a fish scale. Cautions need to be paid on the surface discontinuities. It might represent other discontinuities within the body of the weld.
The most common weld discontinuities found during the visual inspection were undersized welds, nibbling, lap joints, surface cracking, surface porosity, bottom filling, incomplete root penetration, excessive root penetration, burn through, and excessive reinforcement.
Good welding before surface finishing is gold color as below the first picture. Good welding on the final product is in a continuous fish scale pattern, as below the second picture.
