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What are the precautions for using pipe caps?
Release time:
12 Nov,2021
Carbon steel end caps can develop cracks in environments such as nitrate, ammonia, and alkaline sodium. Please specify the need to eliminate residual stress when ordering end caps. Austenitic stainless steel may experience stress corrosion cracking in specific chloride environments, so please select appropriate materials in the design. For carbon steel containers that require hot-dip galvanizing or aluminum coating, please perform heat treatment first to remove residual stress.
1. Measure the outer circumference of the pipe cap. If you need to process a cylinder, please inquire with the company about the expected dimensions of the outer circumference.
2. Divide the outer circumference of the pipe cap into 4 equal parts and mark them on the cylinder and the pipe cap.
3. Position welding; the customer should select the positioning points based on the diameter and plate thickness.
4. After the positioning welding is completed, proceed with welding. Pay attention to the protection of the stainless steel head surface. After welding the head to the cylinder, promptly clean the weld seam, slag, spatter, heat-affected zone, and surrounding contaminants, and perform PT inspection and surface pickling.
5. Prevent scratches on the surface of the stainless steel pipe cap.
6. Prevent direct contact with carbon steel to avoid iron ion contamination.
7. Do not store outdoors; protect from rain.
8. Avoid forced welding. The structural design should prevent excessive constraint stress.
9. The chloride ion content of the water used for the hydrostatic test must not exceed 25mg/L, and it should be dried promptly after the test.
10. Stainless steel pickling cannot be used for reducing acids such as hydrochloric acid.
11. Strictly adhere to the medium compatibility specified in the "Capacity Regulations." Note: For stable austenitic stainless steel heads such as 0Cr18Ni9 and 304, improper surface protection can easily lead to surface pitting corrosion. When combined with processing stress and welding stress, it can lead to stress corrosion and intergranular corrosion. Therefore, customers should pay special attention to the surface protection of such stainless steels.
Precautions for using pipe caps:
1. Carbon steel heads may develop cracks in environments with nitrates, ammonia, alkaline sodium, etc. Please specify the elimination of residual stress when ordering heads.
2. Austenitic stainless steel may experience stress corrosion cracking in specific chloride environments; please select appropriate materials in the design.
3. For carbon steel containers that require hot-dip galvanizing or aluminum coating, please perform heat treatment first to remove residual stress.
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Specializing in the production of various pipeline equipment
Main Products
The company's products mainly include three series and more than 100 varieties: main ceramic wear-resistant pipes, pipe fittings, bimetal surfacing wear-resistant pipes, elbows, elbows, tees, crosses, reducers, pipe caps, flanges, supports and hangers, waterproof sleeves, corrugated compensators, etc.
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Tel:+86-317-5121666
E-mail:yongle@zhsteelfittings.com
Website:www.yszhuoheng.com
Address: No. 12, Pu 1st Road, Pu Wa Industrial Park, Yanshan County, Cangzhou City, Hebei Province
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Address: Wuli Kiln Industrial Zone, Yanshan County, Cangzhou City, Hebei Province
Tel:+86-317-5121666
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