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    • Optimized rifled tubes for high-pressure boilers
    • Optimized rifled tubes for high-pressure boilers
    • Optimized rifled tubes for high-pressure boilers

Optimized rifled tubes for high-pressure boilers

  • Product Model:O.D.:Φ22mm~Φ82.6mm;WT.:4.0mm~16.0mm
    Feature Description:
    Internally multi-lead rifled steel tubes shall be applied on water wall of power plant boilers, as main component for heat exchange, the rotary movement of water caused by internal spiral ribs can eliminate steam film on tube inner surface and thus achieve nucleate boiling. There are two types of in...
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Detailed Introduction

Internally multi-lead rifled steel tubes shall be applied on water wall of power plant boilers, as main component for heat exchange, the rotary movement of water caused by internal spiral ribs can eliminate steam film on tube inner surface and thus achieve nucleate boiling. There are two types of internally ribbed tubes: Multi-lead rifled tube and Optimized multi-lead rifled tube.

Multi-lead rifled tubes are grouped into two types, designated Type A and Type B, with 30 degree helix angle, these unique products can improve thermal efficiency by 30%, in comparison to bare tubes.

Optimized multi-lead rifled tube is a newly-developed ribbed tube, its helix angle is up to 40 degree and more, thus can further improve thermal efficiency by 20% in comparison with ordinary multi-lead rifled tubes, which certainly have better heat transmission performance;

Detail see heat-transfer characteristics below, including bare tubes, multi-lead rifled tubes and optimized multi-lead rifled tubes: 


Below is a comparison table of Changbao T12 OMLR type rifled tubes and Benteler product

产地

Manufacture

外径

OD

mm

壁厚

WT

mm

螺纹头数Number of ribs

螺纹高度Specified rib height

mm

螺纹顶宽

Rib width at top

mm

螺旋升角°

Lead angle

螺纹侧边角°

Rib side angle

Benteler

35*6.5

34.92

20.55

6

1.26

5.81

42°

56°

常宝CB

31.8*5.5

31.75

20.15

6

1.25

5.91

42°

65°

常宝CB

34.9*6.1

34.96

21.40

6

1.31

6.04

44°

66°


Main steel grades

20G、SA210C、SA210A1、15CrMoG、12Cr1MoVG、T2、T12、T23、T91

Standard (Part)

GB5310-2008、GB/T 20409-2006 Chinese National Standard Multi-rifled seamless steel tubes for high pressure boiler

ASME SA-210M-2015 Standard Specification For Seamless Medium-Carbon Steel Boiler And Superheater Tubes.

ASME SA-213M-2015 Specification For Seamless Ferritic And Austenitic Alloy-Steel Boiler, Superheater, And Heat-Exchanger Tubes.O.D.:Φ22mm~Φ82.6mm;WT.:4.0mm~16.0mm



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