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常见压力,管径,螺纹单位换算

单位换算&镙纹对照
 
常用压力单位换算表          
Kgf/cm2Mpa BarKPa mBar  psi  mmH2O Torr atm  Pa(N/M2)微巴
μbar
inHg
千克力/厘米2 ib/in2 mmAq  mmHg  帕斯卡
工程大气压 兆帕 千帕 毫巴 磅/英寸2 毫米水柱 毫米汞柱 标准大气压 牛顿/米2 巴利 英寸汞柱
1 0.098066 0.980665 98.067 980.67 14.223 10,000 735.559 0.96784 98063.891 980638.91 28.9641819
10.19721 10 1,000 10,000 145.04 101,971.6 7,500.61 9.8692 999977.10 9999771.0 295.353555
1.01972 0.11 100 1,000 14.504 10,197.16 750.062 0.98692 99997.710 999977.10 29.5353555
0.0102 0.001 0.011 10 0.145 101.9716 7.50062 0.009869 1000.2516 10002.516 0.29543465
0.00102 0.0001 0.001 0.11 0.0145 10.19716 0.750062 0.000987 100.02516 1000 0.02954346
0.07031 0.006895 0.06895 6.895 68.951 703.08 51.7157 0.06805 6891.1564 68950 2.03537414
0.0001 0.000009 0.000098 0.0098 0.098 0.00141 0.073556 0.000096 9.8063891 98.063891 0.00289361
0.00136 0.000133 0.001333 0.1333 1.3332 0.0193 13.59511 0.001316 133.28947 1332.8947 0.03936842
1.03323 0.101325 1.013250 101.33 1013.3 14.696 10,332.28 7601 101300 1013000 29.92
1.01*10-5 0.000001 0.00001 0.001 0.01 1.45*10-4 0.010197 0.000750 9.869*10-61 10 0.00029536
1.01*10-6 0.0000001 0.000001 0.0001 0.001 1.45*10-5 0.0101974 7.5*10-4 9.8*10-70.110.00002953
0.0345254 0.00340 0.0340 3.375 33.75 0.491310 345.25401 25.40106 0.033422453385.69518 33856.9511
 PRESSURE CONVERSIONTABLES
kPabarMPapsikg/cm²mbarin H2Omm.hgcm.hgmet H2Opa
10.010.0010.1450.0110.04.0217.5250.7520.1021 000
10010.114.5031.021 000402.164752.4775.24710.211100 000
1000101145.0310.197     1 000 000
6.8950.0690.00710.0768.94727.7251.8845.1880.76 895
98.0660.9810.098114.2231980.662394.408737.95973.79610.01898 066
0.10.0010.00010.0140.00110.4020.7520.0750.0102100
0.2490.00250.000250.0360.00252.48611.8710.1870.025249
0.1330.00130.00010.0190.00141.3290.53410.10.0136133
1.3280.0130.0010.1930.01413.295.341010.1361 328
9.8070.0980.011.4220.09998.06639.3773.7967.37919 807
.001         1

1 kpa= 0.145 psi1psi = 6.895 kpa
1 kpa =4.021 inH2O1 H20 = 0.249 kpa
1 kpa = 102 mmWater1mm Water =0.0098 kpa
1 kpa = 0.102 MetWater1 met Water=9.807 kpa
1 kpa = 0.01bar1 bar = 100kpa
1 kpa = 0.001mpa1 mpa = 1000kpa
1 kpa = .01kg/cm²1kg/cm² = 98.066kpa
1 kpa =0.335 fthd H2O -20°C1 Ft HdH2O = 2.984 kpa
1 kpa = 7.525 mmHG1 mm HG = 0.133kpa
1 KN = 98.066kg1 Torr = 760 mmHg at 0°C
10KN =980.66kg1 kg = 2.2046lbs

SPECIFIC GRAVITY
HFO Heavy Fuel OilSG0.9962
HFO Heavy Fuel Oil SG0.9782 @ 15°C
HFO Heavy Fuel Oil SG0.9419 @ 70°C
Diesel0.85
Water1.00
Sea Water1.0257
P = Head (in met) x SGx 9.8066

CONVERSION OF TONSGAUGES
To get presssure inkg/cm2.To get presssure in MPa usethe following
P =Mass in kg's
Area in cm2
P =Mass in kg's x0.098066
Area in cm2
 
 
NPT螺纹PT螺纹G螺纹和公制螺纹的区别
 
 
NPTPTG 都是管螺纹.
NPT 是 National (American) Pipe Thread的缩写,属于美国标准的 60 度锥管螺纹,用于北美地区.国家标准可查阅 GB/T12716-1991
PT 是 Pipe Thread 的缩写,是 55度密封圆锥管螺纹,属惠氏螺纹家族,多用于欧洲及英联邦国家.常用于水及煤气管行业,锥度规定为 1:16. 国家标准可查阅GB/T7306-2000
G 是 55 度非螺纹密封管螺纹,属惠氏螺纹家族.标记为 G代表圆柱螺纹.国家标准可查阅 GB/T7307-2001
另外螺纹中的1/4、1/2、1/8 标记是指螺纹尺寸的直径,单位是英吋.行内人通常用分来称呼螺纹尺寸,一吋等于8分,1/4吋就是2分,如此类推.G就是管螺纹的统称(Guan),55,60度的划分属于功能性的,俗称管圆。即螺纹由一圆柱面加工而成。
ZG俗称管锥,即螺纹由一圆锥面加工而成,一般的水管接头都是这样的,国标标注为Rc
公制螺纹用螺距来表示,美英制螺纹用每英寸内的螺纹牙数来表示,这是它们*大的区别,
公制螺纹是60度等边牙型,英制螺纹是等腰55度牙型,美制螺纹60度。
公制螺纹用公制单位, 美英制螺纹用英制单位。
管螺纹主要用来进行管道的连接,其内外螺纹的配合紧密,有直管与锥管两种。公称直径是指所连接的管道直径,显然螺
纹直径比公称直径大。
1/4,1/2,1/8是英制螺纹的公称直径,单位是英寸。
 
英制管螺纹美制管螺纹对照表
 
英制管螺纹英制管螺纹美制管螺纹
规格标准径钻孔径规格标准径有交牙部之长度(*小)中之毋螺牙内径标准长度(*小)中之毋螺牙内径规格钻孔径
*大*小使用纹刀时不用纹刀时NPTNPS
使用绞刀时不用绞刀时
PS 1/16-286.506.6326.490PT 1/16-286.106.206.2446.3841/16 - 276.106.256.35
PS 1/8-288.508.6378.495PT 1/8-288.108.208.2498.3881/8 - 278.338.438.74
PS 1/4-1911.4011.54911.341PT 1/4-1910.7011.0010.96211.1741/4 - 1810.7211.1311.13
PS 3/8-1915.0015.05414.846PT 3/8-1914.2014.5014.44814.6583/8 - 1814.2714.2714.68
PS 1/2-1418.5018.77318.489PT 1/2-1417.6018.0017.97918.2631/2 - 1417.4817.8618.26
PS 3/4-1424.0024.25923.975PT 3/4-1423.0023.5023.37823.6633/4 - 1422.6323.0123.42
PS 1-1130.2030.47130.111PT 1-1129.0029.5029.45929.8221 - 11-1/228.5828.9829.36
PS 1-1/4-1138.80 39.132 38.772PT 1-1/4-1137.5038.00 37.976 38.3391-1/4-11-1/237.3137.6938.10
PS 1-1/2-1144.80 45.025 44.665PT 1-1/2-1143.4044.0043.869 44.2321-1/2-11-1/243.6644.0444.45
PS 2 - 1156.50 56.836 56.476PT 2 - 1154.9055.50 55.412 55.844
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