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Come scegliere la dimensione del tubo NPS e la dimensione della macchina per tubi ERW
17 dicembre 2024 10:34
Nominal Pipe Size (NPS) is a North American set of standard sizes for pipes used for high or low pressures and temperatures. "Nominal" refers to pipe in non-specific terms and identifies the diameter of the hole with a non-dimensional number (for example – 2-inch nominal steel pipe" consists of many varieties of steel pipe with the only criterion being a 2.375-inch (60.3 mm) outside diameter). Specific pipe is identified by pipe diameter and another non-dimensional number for wall thickness referred to as the Schedule (Sched. or Sch., for example – "2-inch diameter pipe, Schedule 40"). NPS is often incorrectly called National Pipe Size, due to confusion with the American standard for pipe threads, "national pipe straight", which also abbreviates as "NPS". The European and international designation equivalent to NPS is DN (diamètre nominal/nominal diameter/Nennweite), in which sizes are measured in millimetres, see ISO 6708. The term NB (nominal bore) is also frequently used interchangeably with DN.
Applicazione
Sulla base dell'NPS e della programmazione di un tubo,[5] il diametro esterno del tubo (OD) e lo spessore della parete possono essere ottenuti da tabelle di riferimento come quelle sottostanti, che si basano sugli standard ASME B36.10M e B36.19M. Ad esempio, NPS 14 Sch 40 ha un OD di 14 pollici (360 mm) e uno spessore della parete di 0,437 pollici (11,1 mm). Tuttavia, i valori NPS e OD non sono sempre uguali, il che può creare confusione.
dimensioni della macchina per tubi erw per la scelta e il riferimento
|
Modello |
Diametro esterno del tubo |
Spessore |
Quadrato/Rettangolo |
Spessore |
Velocità |
|
AIS-12 |
φ4~φ12 |
0.2~0.5 |
// |
// |
30~120 |
|
AIS-16 |
φ6~φ16 |
0.2~0.8 |
// |
// |
30~120 |
|
AIS-20 |
φ7~φ20 |
0.2~1.0 |
// |
// |
30~120 |
|
AIS-25 |
φ9~φ25.4 |
0.25~1.2 |
// |
// |
30~120 |
|
AIS-32 |
φ10~φ32 |
0.25~1.5 |
8*8~25.4*25.4 |
0.25~1.2 |
30~120 |
|
AIS-32z |
0.5~2.0 |
0.5~1.5 |
30~100 |
||
|
AIS-40 |
φ12.7~φ40 |
0.3~1.8 |
10*10~31.8*31.8 |
0.3~1.5 |
30~110 |
|
AIS-40z |
0.6~2.0 |
0.6~1.5 |
30~100 |
||
|
AIS-50q |
φ16~φ50.8 |
0.4~1.5 |
12.7*12.7~40*40 |
0.4~1.2 |
30~110 |
|
AIS-50 |
0.5~2.0 |
0.5~1.5 |
30~90 |
||
|
AIS-50z |
0.7~2.5 |
0.7~2.0 |
30~80 |
||
|
AIS-63q |
φ19.05~φ63.5 |
0.6~2.0 |
15*15~50*50 |
0.6~1.5 |
30~90 |
|
AIS-63 |
0.7~3.0 |
0.7~2.5 |
30~80 |
||
|
AIS-63z |
0.8~3.5 |
0.8~3.0 |
20~70 |
||
|
AIS-76q |
φ25.4~φ76.2 |
0.8~2.5 |
20*20~60*60 |
0.8~2.0 |
30~90 |
|
AIS-76 |
0.8~3.5 |
0.8~3.0 |
30~80 |
||
|
AIS-76z |
0.8~4.0 |
0.8~3.5 |
20~70 |
||
|
AIS-90q |
φ30~φ90 |
0.8~3.0 |
25*25~70*70 |
0.8~2.5 |
30~90 |
|
AIS-90 |
0.8~3.5 |
0.8~3.0 |
30~80 |
||
|
AIS-90z |
1.0~4.0 |
1.0~3.5 |
20~70 |
|
AIS-100q |
φ31.8~φ101.6 |
1.0~3.0 |
25*25~80*80 |
1.0~2.5 |
30~90 |
|
AIS-100 |
1.0~3.75 |
1.0~3.25 |
30~80 |
||
|
AIS-100z |
1.0~4.25 |
1.0~3.5 |
20~70 |
||
|
AIS-114q |
φ35~φ114.3 |
1.0~3.0 |
30*30~90*90 |
1.0~2.5 |
20~80 |
|
AIS-114 |
1.2~4.5 |
1.2~4.0 |
20~70 |
||
|
AIS-114z |
φ40~φ114.3 |
1.2~5.0 |
1.2~4.5 |
15~60 |
|
|
AIS-127q |
φ40~φ127 |
1.2~3.5 |
40*40~100*100 |
1.2~3.0 |
20~70 |
|
AIS-127 |
1.5~5.0 |
1.5~4.5 |
15~60 |
||
|
AIS-127z |
φ50~φ127 |
1.5~5.5 |
1.5~5.0 |
10~45 |
|
|
AIS-140q |
φ50~φ141.3 |
1.2~4.0 |
50*50~110*100 |
1.2~3.5 |
15~60 |
|
AIS-140 |
1.5~5.5 |
1.5~5.0 |
10~50 |
||
|
AIS-140z |
φ60~φ141.3 |
2.0~6.0 |
2.0~5.5 |
10~40 |
|
|
AIS-168q |
φ60~φ168.3 |
1.5~5.0 |
60*60~130*130 |
1.5~4.5 |
10~50 |
|
AIS-168 |
2.0~6.0 |
2.0~5.5 |
10~50 |
||
|
AIS-168z |
φ76.2~φ168.3 |
2.5~8.0 |
2.5~7.0 |
10~40 |
|
|
AIS-219q |
φ89.1~φ219.1 |
2.0~6.0 |
70*70~160*160 |
2.0~5.5 |
10~50 |
|
AIS-219 |
3.0~8.0 |
3.0~7.0 |
10~40 |
||
|
AIS-219z |
4.0~10.0 |
4.0~9.0 |
10~40 |
||
|
AIS-273 |
φ114.3~φ273 |
4.0~10.0 |
90*90~200*200 |
4.0~9.0 |
10~40 |
|
AIS-273z |
4.5~12.0 |
120*60~260*130 |
4.5~11.0 |
10~35 |
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