1. Please measure the outer circumference of the head. If you want to process the cylinder in advance, please ask the company for the size of the predetermined outer perimeter.

2. Please divide the outer circumference of the head into 4 equal parts, and mark the cylinder and the head.

3. Carry out positioning welding, and the positioning point of positioning welding should be selected by the customer according to the diameter and plate thickness.

4. After the positioning welding is completed, the welding is carried out. Pay attention to the protection of the surface of the stainless steel head, after the head and the cylinder are welded, the weld, the heat affected zone and the surrounding welding slag, spatter and contaminants should be cleaned in time, and PT inspection and surface pickling should be carried out.

5. Prevent bumps and scratches on the surface of the stainless steel head.

6. Prevent direct contact with carbon steel and avoid iron ion pollution.

7. Do not store in the open air, rainproof.

8. Avoid forced welding. The structural design should prevent excessive restraint stress.

9. The chloride ion content of the water used in the hydrostatic test shall not be greater than 25mg/L, and it should be dried in time after the test.

10. Stainless steel pickling cannot be reduced with hydrochloric acid and other acids.

11. Strictly abide by the medium compatibility stipulated in the "Regulations". Note: For substable austenitic stainless steel heads such as 0Cr18Ni9 and 304, it is easy to cause surface pitting corrosion due to improper surface protection. When superimposed with machining stress and welding stress, stress corrosion and intergranular corrosion are caused. For this reason, the customer is requested to pay special attention to the surface protection of such stainless steels.

Precautions for the use of the head:

1. Carbon steel head will crack in nitrate, ammonia, alkaline sodium and other environments, please explain the residual stress when ordering the head.

2. Austenitic stainless steel will have stress corrosion cracks in a specific environment with chloride ions, please choose the appropriate material when designing.

3. For carbon steel containers that need to be hot-dip galvanized or aluminized, please do heat treatment first, residual stress.