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Steel Tubes for 1000MW Ultra Supercritical Unit

Posted on 2019/10/23
Steel Tubes for 1000MW Ultra Supercritical Unit
Material and specification of steel pipe for 1000MW Ultra Supercritical Unit
What are the materials and specifications of the main steam pipeline of 1000MW Ultra Supercritical Unit?
Due to the difference of boiler parameters, there are two materials and specifications for the main steam pipeline:
(1) material: A335 P92 (ASTM), specification: od381mm x 78mm (main pipe), od349mm x 72mm (connecting pipe).
(2) material: A335 P92 (ASTM), specification: od349mm x 75mm (main pipe), od248mm x 53mm (connecting pipe).
What are the materials and specifications of the high temperature reheat steam pipeline of 1000MW Ultra Supercritical Unit?
Although the temperature of the high-temperature reheat steam pipeline of 1000MW ultra supercritical unit is the same as that of the main steam pipeline, or 1-3 ° C higher, the pressure is much lower than that of the main steam pipeline. Therefore, the material of the main steam pipeline is one grade lower, that is, A335 P91 (ASTM) is used.
Therefore, there are two schemes for materials, and each has two specifications:
(1) A335 P92 (ASTM) scheme: ① specification: od749.3mm x 32mm (main pipe), od502mm x 23mm (connecting pipe). ② specification: od699mm x 35mm (main pipe), od502mm x 26mm (connecting pipe).
(2) A335 P91 (ASTM) scheme: ① specification: od749.3mm x 44mm (main pipe), od502mm x 32mm (connecting pipe). ② specification: od399mm x 50mm (main pipe), od502mm x 38mm (connecting pipe).
What are the materials and specifications of the low temperature reheat steam pipeline of 1000MW Ultra Supercritical Unit?
At present, according to the temperature of low-temperature reheat steam, the material and specification of low-temperature reheat steam pipeline of 1000MW ultra supercritical unit are divided into two levels:
① when the design temperature is not more than 415 ℃, a672b70cl32 (ASTM) is used, main pipe: 1219mm x 39mm, branch pipe: od863.6mm x 28mm.
② when the design temperature is more than 415 ° C, A691 1 / 4CR CL22 (ASTM) is used, main pipe: od1067mm x 38.1mm, branch pipe: od762mm x 28.58mm.

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