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A234 WPB 同心大小头,是指圆心在同一条直线上的大小头管件。这种管件通常用于连接两种不同管径的管道,确保管道系统的流畅性和完整性。碳钢同心大小头的主要结构特征是同心,这种结构使得流体在流经大小头时,流动方向不会发生偏移,能够保持较为平稳的流动状态。
A234 WPB 同心大小头是按照美国材料与试验协会(ASTM)A234 标准制造的,其中WPB表示其材质等级。WPB材质是一种中碳钢材质,具有良好的强度和韧性。在常温下,WPB 材质的同心大小头可以承受一定的压力,适用于如给排水系统、一般的工业蒸汽或气体输送系统等。
A234 WPB 同心大小头的规格
Size Range | 3/4" - 60" / DN20 - 1500 |
Thickness Schedule | SCH 10 - SCH 80, SCH 160, XXS |
America Standard | ANSI / ASME B16.9 |
Japan Standard | JIS B2311/2312/2313 |
Germany Standard | DIN2605/2615/2616/2617 |
Europe Standard | EN10253 |
Carbon Steel | Q235, 20#, 35#, 45#, 20G,ASTM A234 WPB/WPC |
ASME B16.9 同心大小头的尺寸
OD1 | OD2 | END TO END | SCH 40 WEIGHT |
NPS | NPS | H | KG |
3/4 | 3/8 - 1/2 | 38 | 0.07 |
1 | 1/2 - 3/4 | 51 | 0.14 |
1 1/4 | 1/2 - 1 | 51 | 0.19 |
1 1/2 | 1/2 - 1 1/4 | 64 | 0.29 |
2 | 3/4 - 1 1/2 | 76 | 0.46 |
2 1/2 | 1 - 2 | 89 | 0.85 |
3 | 1 1/4 - 2 1/2 | 102 | 1.11 |
4 | 2 - 3 1/2 | 102 | 1.8 |
5 | 2 - 4 | 127 | 3.05 |
6 | 2 1/2 - 5 | 140 | 4.35 |
8 | 3 1/2 - 6 | 152 | 7.12 |
10 | 4 - 8 | 178 | 11.8 |
12 | 5 - 10 | 203 | 17.8 |
14 | 6 - 12 | 330 | 34.3 |
16 | 6 - 14 | 356 | 48.3 |
18 | 8 - 16 | 381 | 65.3 |
20 | 10 - 18 | 508 | 102 |
22 | 12 - 20 | 508 | - |
24 | 12 - 22 | 508 | 143 |
26 | 12 - 24 | 610 | - |
28 | 14 - 26 | 610 | - |
30 | 14 - 28 | 610 | - |
32 | 20 - 30 | 610 | 230 |
34 | 22 - 32 | 610 | 245 |
36 | 22 - 34 | 610 | 282 |
38 | 24 - 36 | 610 | - |
40 | 28 - 38 | 610 | - |
42 | 28 - 40 | 610 | - |
44 | 32 - 42 | 610 | - |
46 | 34 - 44 | 711 | - |
48 | 36 - 46 | 711 | - |
52 | 40 - 48 | 711 | - |
56 | 40 - 52 | 711 | - |
60 | 44 - 56 | 711 |
对焊管件的公差表
对焊管件的公差 | |||||||||||||
公称尺寸Nominal Size | 所有管件1)2) | 45" 、 90" 弯 | 3D 弯头 | 180 " 弯头 | 管帽 | 异径管 、 | 翻边短节 | ||||||
DN | NPS | OD 3) 4) | ID 3) | A B C M | A B | O | K | U | E, E1 | H F | G | R | t |
15-65 | 1/2 -21/2 | +1.6 | ± 0.8 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 3 | ± 2 | 0 | 0 | +1.6 |
80-90 | 3-31/2 | ±1.6 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 3 | ± 2 | 0 | 0 | +1.6 |
100 | 4 | ±1.6 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 3 | ± 2 | 0 | 0 | +1.6 |
125-200 | 5-8 | +2.4 | ± 1.6 | ± 2 | ± 3 | ± 6 | ± 6 | ± 1 | ± 6 | ± 2 | 0 | 0 | +1.6 |
250-450 | 10-18 | +4.0 | ± 3.2 | ± 2 | ± 3 | ± 10 | ± 6 | ± 2 | ± 6 | ± 2 | 0 | 0 | +3.2 |
500-600 | 20-24 | +6.4 | ± 4.8 | ± 2 | ± 3 | ± 10 | ± 6 | ± 2 | ± 6 | ± 2 | 0 | 0 | +3.2 |
650-750 | 26-30 | +6.4 | ± 4.8 | ± 3 | ± 6 | --- | --- | --- | ± 10 | ± 5 | --- | --- | --- |
800-1200 | 32-48 | +6.4 | ± 4.8 | ± 5 | ± 6 | --- | --- | --- | ± 10 | ± 5 | --- | --- | --- |
1300-1500 | 52-60 | +6.4 | ± 4.8 | ± 5 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
1600-1700 | 64-68 | +6.4 | ± 4.8 | ± 5 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
1800-2000 | 72-80 | +6.4 | ± 4.8 | ± 5 | --- | --- | --- | --- | --- | --- | --- | --- | --- |
碳钢对焊管件防腐工艺
对焊管件通常由A234 WPB 材质制成,在不同的环境中容易受到腐蚀。刷漆可以在金属表面形成一层保护膜,将金属与外界环境隔离开来,从而减缓腐蚀速度,延长对焊管件的使用寿命。
3PE是一种三层结构的聚乙烯防腐涂层。这种三层结构的设计充分发挥了各层材料的优势,实现了良好的防腐效果。
3PE防腐一般由3层结构组成:
●环氧粉末(FBE>100um)
●胶粘剂(AD)170~250um
●聚乙烯 (PE)1.8~3.7mm
环氧粉末是一种热固性粉末涂料,主要由环氧树脂、固化剂、颜料、填料和助剂等组成。环氧树脂是环氧粉末的主要成膜物质,它提供了良好的附着力、耐化学性和机械性能。