Points for attention in the use of pipe caps

1. Please measure the circumference of the head. If the cylinder is processed in advance, please ask the company for the size of the predetermined perimeter.

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

3. For positioning welding, please select the positioning point according to the diameter and plate thickness.

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

5, prevent the stainless steel head surface knock and scratch.

6, prevent direct contact with carbon steel, avoid iron ion pollution.

7, do not store in the open air, rain proof.

8. Avoid forced assembly welding. The structure design should prevent excessive confining stress.

9, water pressure test chloride ion content shall not be more than 25mg/L, after the test to blow dry in time.

10, stainless steel pickling can not use hydrochloric acid and other reducing acids.

11. Carbon steel head will crack in the environment of nitrate, ammonia, alkaline sodium and so on. Please specify the elimination of residual stress when ordering the head.

12. Austenitic stainless steel in the presence of chloride ions in the specific environment will occur stress corrosion crack, please choose the right material in the design.

13. For carbon steel containers that need hot galvanizing or aluminizing, please do heat treatment first to remove residual stress.