-
Categories
-
Pharmaceutical Intermediates
-
Active Pharmaceutical Ingredients
-
Food Additives
- Industrial Coatings
- Agrochemicals
- Dyes and Pigments
- Surfactant
- Flavors and Fragrances
- Chemical Reagents
- Catalyst and Auxiliary
- Natural Products
- Inorganic Chemistry
-
Organic Chemistry
-
Biochemical Engineering
- Analytical Chemistry
- Cosmetic Ingredient
-
Pharmaceutical Intermediates
Promotion
ECHEMI Mall
Wholesale
Weekly Price
Exhibition
News
-
Trade Service
The Zhongke project of Shijian Company was carefully organized and implemented.
The professional team of spherical tank installation took 6 months of careful assembly and welding.
The installation, welding and overall heat treatment of two ethylene low-temperature spherical tanks of the 800,000-ton/year steam cracking unit of Zhongke Refining and Chemical Project were completed.
, and a successful hydraulic test on November 25 and 28 respectively
.
Each of the two low-temperature spherical tanks weighs 290 tons, has a diameter of 15.
7 meters, a wall thickness of 40 mm, and a volume of 2,000 cubic meters.
Since it is used to load flammable and explosive vinyl media, the spherical tanks are installed, assembled, welded and assembled.
, heat treatment, hydrostatic test and other processes have strict quality control requirements, especially the three processes of spherical tank welding, heat treatment and hydrostatic test, which have high technical quality requirements and strict control
.
In view of the high quality requirements of two low-temperature spherical tanks and the welding of the spherical tank with a total length of 762 meters formed by 136 "football flap" spherical shell plates, Shijian strictly controlled the welding quality of spherical tanks.
First, seal the entire spherical tank with canvas to fully protect the spherical tank from wind and rain; before welding the spherical tank, in strict accordance with the requirements of the specification, electric heating is performed on each welding plate seam in advance.
When the preheating temperature reaches above 150 degrees Celsius, the For plate seam welding, the electric welder adopts the short-distance multi-layer welding method of weld seam to ensure that the temperature between the welding layers is kept above 150 degrees Celsius.
.
In order to eliminate the stress generated in the welding of the spherical tank group, stabilize the geometric size of the spherical tank, change the metallographic structure of the welding, improve the toughness and stress resistance of the metal, and prevent the occurrence of cracks, after the welding of the two low-temperature spherical tanks is completed, ten construction The professional installation team of spherical tanks carried out extremely strict overall heat treatment on the two low-temperature balls.
They wrapped the whole sphere tightly with a 60 mm thick thermal insulation quilt, and then ignited and heated in the sphere, and real-time detection and control in the heat treatment machine After 12 hours of uniform heating, the entire sphere is heated to 580 degrees Celsius, then kept at a constant temperature for 2.
5 hours, and then lowered to 400 degrees Celsius at a constant rate.
The entire heat treatment process is strictly implemented in accordance with the standard plan, and finally all the stress generated during the welding process of the spherical tank is eliminated.
, and meet the design index requirements, this process has passed the inspection and acceptance of the quality supervision station, the owner, the supervisor and the contractor
.
In order to test the overall strength of the spherical tank, the welding quality of the spheres, and improve the bearing capacity of the spherical tank, after the heat treatment of the spherical tank was completed, on November 25 and 28, two ethylene low-temperature spherical tanks were injected with water for hydraulic pressure.
In the test, the sphere specification requires a design pressure of 1.
95 MPa, and the test pressure during the pressure test process is 2.
44 MPa.
During the pressure test, experts from the Guangdong Provincial Special Equipment Inspection Institute and the quality supervision and inspection personnel of the participating units jointly On-site supervision and inspection of spherical tanks
.
After the inspection and monitoring of the water pressure test, the two low temperature balls were kept under the test pressure of 2.
44 MPa for 30 minutes.
After inspection, the balls did not show any leakage and leakage.
After monitoring the water pressure test table pointer did not change, and the two ethylene low temperature The hydrostatic test of the spherical tank was successful once, reproducing the high quality and high level of the welding of the group
.
