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Improved Boiler Efficiency

Rifled tubes are used in heat exchangers and boilers to provide highly energy efficient means of heat transfer. The presence of the internal rifling induces centrifugal forces in the mass flow thereby separating the water from the steam fraction and forcing the water towards the tube wall. As a result of this phenomenon and the increase in internal surface the following advantages accrue:

  • Improved heat transfer rate even at higher steam quality levels
  • Very good heat transfer even at low mass flux levels
  • Reduction in mean metal temperature of the tube wall
  • Ability to increase heat transfer rate by optimizing rifling geometry

Specification And Grades

Rifle Tubes can be supplied against ASTM, ASME, A/SA 192, 209, 210 and 213 specifications and all associated grades.

Tubes can be supplied against equivalent specifications like EN 10216, DN 17175, BS 3059, JIS 3461 ,3462.

Tubes can be supplied to bath A and B type profiles.Detailed dimensions for each profile are given in the table.

FULL RANGE OF MATERIALIS

We manufacture tubes in every possible boiler grade steels. All our steel is melted in-house through electric arc furnace route, than is ladle refined, 100% vacuum degassed, continuous cast and rolled.

APPROVALS

ISMT is ISO 14001, ISO/TS 16949:2002, and OHSAS 18001 approved. In addition we hold approvals from all major national and international official authorities, customers, and third party certification agencies.

Customized Rifle Geometries

As described above the heat transfer rate can be optimized by varying the rifling geometry based on operation conditions. In addition to the standard rifle tubes (covered in this brochure), ISMT manufactures rifled tubes to suit any customized geometry and in all boiler steel grades. We regularly manufacture and deliver such customized solutions at short notice.

ASSURED QUALITY

With over 25 years of experience in the production of precision seamless tubes for the Powergen industry we can guarantee the quality of all our tubes. The entire production process, the melting of steel, the manufacture of the hot-finished tube, the cold drawing, and the final heat treatment to obtain the desired metallurgical properties is carried out in-house. Each and every tube is then ultrasonically and/or eddy current tested to ensure quality.

ISMT - Multi-Rifled Tubes Collapse Content

O.D(mm)28.58to40.64to50.80to63.50to76.20
a(mm) 0.15 0.20 0.25 0.30 
O.D.(in)1.125to1.600to2.000to2.50to3.000
a(in.) 0.006 0.008 0.010 0.012 

 

ItemValueTolerances
ATubes outsider diameter--aa
BMajor inside diameterB=A-(1.11*D*2)B=A-(1.11*D*2)aa
CMin. inside diameter----
DMin.wall thickness-   
ENumber of ribs----
FRib width at the top(circumferiential)4.78 mm0.188 in.Nominal valueNominal value
HSpecified rib height  +/-0.30 mm+/-0.012 in.
KRib side angle (both sides of the rib)55o55o+/-15o+/-15o
LRib radius (top and bottom of the rib)form 0.4 to 2 mm1/64 to 5/64 in.  
MPitch(rib lead)- +/-3.18 mm+/-0.125 in.
NLead  +/-3.18 * E mm+/-0.125 * E in.
PLead angle30o30oNominal valueNominal value
SRib width at top(longitudinal)8.28 mm0.326 in.+/-1.27 mm+/-0.050 in.

 

O
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T
S
I
D
E

D
I
A
M
E
T
E
R
 Minimum Wall
Thickness
Major
I.D
Major I.DRIB heightLeadMean WeightFlow SectionWet Internal
Perimeter
 mmin. mmin.mmin.mmin.Kg/mLb/ftmm2Sq in.mmin.
31.75mm
1.250 in.
3.960.156622.850.9040.880.035124.94.9183.182.1373870.61279.303.18
4.190.165622.450.8840.880.035122.14.8093.322.2323690.58477.603.11
4.570.180621.600.8500.870.034117.54.6243.552.3843400.53874.903.00
38.10mm
1.500 in.
4.190.165628.801.1340.960.038156.76.1694.072.7356220.97798.203.93
4.700.185627.671.0890.940.037150.55.9244.462.9965720.89994.653.78
5.080.200626.821.0560.930.037145.95.7454.743.1855360.84491.803.67
42.28mm
1.625 in.
4.190.165631.971.2591.000.039173.96.8494.442.9877721.211108.504.34
4.650.183630.961.2190.980.039168.46.6314.843.2497221.133105.204.21
5.080.200630.001.1810.970.038163.26.4255.193.4896771.062102.104.08
5.590.220628.871.1370.960.038157.16.1855.603.7626250.98298.403.94
44.45mm
1.750in.
4.190.165635.151.3841.040.041191.27.5294.823.2399381.468118.804.74
4.570.180634.301.3501.030.040186.67.3445.183.4808921.396116.104.63
5.080.200633.171.3061.010.040180.57.1055.643.7938331.305112.404.49
5.590.220632.051.2621.000.039174.56.8656.094.0957751.216108.704.35
6.100.240630.921.2170.980.039168.26.6206.534.3877201.129105.104.20
47.63mm
1.875in.
4.570.180837.481.4751.060.042203.98.0245.673.81110591.660129.205.17
5.080.200836.351.4311.050.041197.77.7856.184.1549941.560125.505.03
5.590.220635.221.3871.040.041191.67.5456.594.4289421.475119.004.75
6.100.240634.091.3421.020.040185.57.3007.074.7508811.379115.407.61
6.600.260632.961.2981.010.040179.37.0617.535.0618221.288111.704.46
50.80mm
2.000in.
5.080.200839.521.5561.080.042215.08.4656.634.45711821.851135.805.44
5.590.220838.401.5121.070.042208.98.2257.174.81911131.746132.105.29
6.100.240837.271.4671.060.042202.77.9807.695.17010471.641128.505.15
6.600.260836.141.4231.050.041196.67.7418.205.5119821.542124.805.00
53.98mm
2.125in.
5.590.220841.571.6371.100.043226.18.9057.675.15213112.054142.405.70
6.100.240840.441.5921.090.043220.08.6608.235.53312391.940138.805.55
6.600.260839.311.5481.080.042213.98.4218.785.90311691.832135.105.41
7.110.280838.191.5031.070.042207.78.1769.326.26311011.725131.505.26
57.58mm
2.250in.
5.590.220844.751.7621.120.044243.49.5858.165.48515252.386152.706.11
6.100.240843.621.7171.110.044237.39.3408.775.89514481.263149.005.96
6.600.260842.691.6731.100.043231.19.1019.376.29513722.147145.405.82
7.110.280841.361.6281.090.043225.08.8569.956.68512982.031141.705.67
7.620.300840.231.5841.080.043218.98.61710.517.06412261.920138.105.53
8.130.320839.111.5401.070.042218.98.37811.067.42311561.813134.405.38
60.33mm
2.375in.
5.590.220847.921.8871.150.045260.710.2568.665.81817552.743163.006.51
6.100.240846.791.8421.140.045254.510.0209.316.25816722.611159.306.37
6.600.260845.661.7981.130.045248.49.7819.956.68815902.486155.706.22
7.110.280844.541.7531.120.044242.39.53610.587.10715112.361152.006.08
7.620.300843.411.7091.110.044236.19.29711.187.51514332.242148.405.93
8.130.320842.281.6651.100.043230.09.08511.787.91313582.126144.705.79
8.590.338842.281.6251.090.043224.58.84012.308.26212922.023141.405.66
63.50mm
2.500 in.
6.100.240849.971.9671.170.046271.810.7009.856.61219122.984169.606.77
6.600.260848.841.9231.160.046265.710.46110.547.08018252.850165.906.63
7.110.280847.711.8781.150.045259.510.21611.207.52917402.716162.306.48
7.620.300846.581.8341.140.045253.49.97711.867.96716572.588158.606.34
8.130.320845.461.7901.130.044247.39.73812.498.39515752.464155.006.20
8.590.338844.441.7501.120.044241.89.52013.058.77115042.353151.706.07
9.140.360843.201.7011.110.044235.09.25313.729.21814192.221147.705.91
9.530.375842.351.6671.100.043230.49.06814.169.51613632.131145.005.80

 

ItemValueTolerances
BTubes outsider diameter--aa
CMajor inside diameterC=B-(1.11*1*2)C=B-(1.11*1*2)aa
DNumber of ribs----
ESpicified rib height--B(1)B(1)
FPitch(rib lead)--+/-3.18mm+/-0.125 in.
GLead--+/-3.18*D mm+/-0.125*D in.
HRib width at the top(longitudinal)5.59 mm0.220 in.+/-1.27 mm+/-0.050 in.
IMin. wall thickness----
jRib side angle (both sides of the rib)55o55o+/-15o+/-15o
MMin. inside diameter----
LRib radius (top and bottom of the rib)form 0.4 to 2 mm1/64 to 5/64 in.  
PLead angle30o30oNominal valueNominal value
SRib width at top(longitudinal)3.23 mm0.127 in.--

(1) The average rib height of all the ribs should fall without the proper value of +/- tolerancein the following table. The maximum deviation on anyrib height from specification values should not exceed the +/- tolarance by more than 0.003 in.

O
U
T
S
I
D
E

D
I
A
M
E
T
E
R
 Minimum Wall
Thickness
No.
of RIBC
Major I.DRIB heightLeadMean WeightFlow SectionWet Internal
Perimeter
 mmin. mmin.mmin.mmin.Kg/mLb/ftmm2Sq in.mmin.
28.58mm /
1.125 in.
3.760.184420.230.7960.950.037110.14.3302.621.7613070.47668.32.69
3.960.156419.780.7790.940.037107.64.2382.731.8352930.45566.92.63
4.190.165419.270.7590.930.037104.84.1292.851.9172780.43165.22.57
4.570.180418.430.7250.920.036100.23.9443.052.0482530.39262.52.46
31.75 mm/
1.250 in.
3.760.148623.410.9210.990.039127.35.0103.012.0234080.63281.03.19
3.960.156622.950.9040.980.039124.94.9183.142.1093920.60879.53.13
4.190.165622.450.8840.980.039122.14.8093.282.2043740.58077.93.07
4.570.180621.600.8500.970.038117.54.6243.512.3563450.53475.12.96
34.92 mm/
1.375 in.
3.760.148626.581.0461.030.041144.65.6903.352.2485320.82491.33.59
3.960.156626.131.0291.030.040142.15.5983.492.3465130.79689.83.54
4.190.165625.621.0091.020.040139.45.4893.652.4544930.76488.23.47
4.570.180624.780.9751.010.040134.85.3043.912.6294600.71285.43.36
4.780.188624.320.9581.000.039132.35.2124.052.7204420.68684.03.31
5.160.203623.480.9240.990.039127.75.0274.292.8864110.63681.23.20
5.590.220622.520.8870.980.039122.54.8254.563.0673770.58478.13.08
37.31 mm/
1.469 in.
3.760.148628.971.1401.060.042157.66.2023.662.4596270.927101.64.00
3.960.156828.521.1231.050.041155.16.1093.822.5656070.942100.23.94
4.190.165628.011.1031.050.041152.46.0003.932.6245930.91995.93.78
4.570.180627.161.0691.040.041147.85.8154.222.8345560.86293.13.67
4.780.188626.711.0521.030.041145.35.7234.372.9345370.83391.73.61
5.160.230625.871.0181.020.040140.75.5384.643.1165030.77988.93.50
5.590.220624.910.9811.010.040135.55.3374.943.3164650.72185.83.38
6.100.240623.780.9361.000.039129.45.0925.273.5424220.65482.23.24
38.1 mm/
1.500 in.
3.760.148829.761.1711.070.042161.96.3703.742.5156631.027104.24.10
3.960.156829.301.1541.060.042159.46.2783.912.6246430.997102.74.05
4.190.165828.801.1341.060.042156.76.1694.092.7456200.961101.13.98
4.570.180627.951.1001.050.041152.05.9484.322.9015900.91495.73.77
4.780.188627.501.0831.040.041149.65.8924.473.0045710.88594.23.71
5.160.203626.651.0491.030.041145.05.7074.753.1925350.98391.53.60
5.590.220625.701.0121.020.040139.85.5055.063.3994960.76988.43.48
6.100.240624.570.9671.010.040133.65.2605.403.6324520.70084.73.34
6.350.250624.000.9451.000.039130.65.1415.573.7444300.66782.93.26
41.28 mm/
1.625 in.
3.760.148832.931.2961.100.043179.17.0504.082.7418181.268114.54.51
3.960.156832.481.2791.100.043176.76.9584.262.8627951.234113.14.45
4.190.164831.971.2591.090.043173.96.8494.462.9977701.194111.44.39
4.570.180831.131.2251.080.043169.36.6644.793.2167281.128108.74.28
4.780.188830.671.2081.080.042166.96.5724.963.3317071.096107.24.22
5.160.203829.831.1741.070.042162.36.3875.273.5416671.033104.44.11
5.590.220828.871.1371.060.042157.16.1855.613.7726230.966101.33.99
6.100.240627.741.0921.040.041150.95.9405.943.9935810.90095.03.74
6.350.250627.181.0701.040.041147.85.8216.134.1205570.86393.23.67
6.600.260626.611.0481.030.041144.85.7016.324.2455330.82791.43.60
7.210.284625.260.9951.010.040137.45.4136.754.5344790.74287.03.43
44.45 mm/
1.750 in.
3.760.148836.111.4211.140.045196.47.7304.412.9679891.533124.84.91
3.960.156835.651.4041.130.045194.07.6384.613.1009641.495123.84.86
4.190.165835.151.3841.130.044191.27.5294.833.2489361.452121.74.79
4.570.180834.301.3501.120.044186.67.3445.193.4898901.379119.04.68
4.780.188833.851.3331.110.044184.17.2525.383.6168661.344117.54.63
5.160.203833.001.2991.100.043179.57.0675.733.8488221.274114.84.52
5.590.220832.051.2621.090.043174.36.8656.114.1057741.200111.64.40
6.100.240830.921.2171.080.043168.26.6206.544.3977181.113108.04.25
6.350.250830.351.1951.080.042165.16.5016.754.5396911.720106.14.18
6.600.260829.791.1731.070.042162.16.3816.964.6786651.310104.34.11
7.210.284828.441.1201.050.041154.76.0937.445.0026040.93699.93.93
7.620.300627.531.0841.040.041149.85.8977.695.1685720.88794.33.71
7.950.313626.801.0551.030.041145.85.7397.935.3325410.83892.03.62
50.80 mm/
2.000 in.
3.960.1561042.001.6541.200.047228.58.9985.393.62313402.078147.05.79
4.190.1651041.501.6341.190.047225.78.8895.653.79713702.027145.35.72
4.570.1801040.651.6001.180.047221.1218.76.088.70412534.083142.65.61
4.780.1881040.201.5831.180.046218.78.6126.304.23312241.899141.15.56
5.160.2031039.351.5491.170.046214.18.4276.714.51011721.816138.35.44
5.590.2201038.401.5121.160.046208.98.2257.174.41611141.729135.25.32
6.100.2401037.271.4671.150.045202.77.9807.695.16710471.623131.55.18
6.350.2501036.701.4451.140.045199.77.8617.945.33910151.573129.65.10
6.600.260836.141.4231.140.045196.67.7418.135.4629911.567124.94.92
7.210.284834.791.3701.120.044189.27.4538.725.8579161.422120.64.75
7.620.300833.881.3341.110.044184.37.2579.106.1128681.346117.64.63
7.950.313833.151.3051.110.044180.37.0999.406.3148301.286115.25.54
8.130.320832.761.2901.100.043178.27.0189.566.4218101.256114.04.49
8.640.340831.631.2451.090.043172.16.77310.006.7207531.167110.34.34
53.98 mm/
2.125 in.
3.960.1561245.181.7791.230.048245.89.6785.823.91015472.398160.46.32
4.190.1651244.671.7591.220.048243.09.5676.104.09815112.343158.76.25
4.570.1801043.831.7251.220.048238.49.3846.484.35714622.265152.96.02
4.780.1881043.371.6371.210.048236.09.2926.724.51914312.220151.45.96
5.160.2031042.531.7081.200.047231.49.1077.174.81813752.130148.75.85
5.590.2201041.571.6741.190.047226.18.9057.665.15013122.034145.65.73
6.100.2401040.441.5921.180.047220.08.6608.235.53112401.921141.95.58
6.350.2501039.881.5701.180.046216.98.5418.515.51712041.867140.05.51
6.600.2601039.311.5481.170.046213.98.4218.785.90111691.813138.25.44
7.210.2841037.961.4951.160.046206.58.1339.426.33110881.687133.85.27
7.620.3001037.061.4591.150.045201.67.9379.836.60910351.605130.85.15
7.950.313836.331.4301.140.045197.67.77910.106.78510021.553125.64.94
8.130.320835.931.4151.140.045195.57.69810.276.9029801.519124.34.89
8.640.340834.801.3701.120.044189.37.54310.767.2309171.422120.64.75
9.140.360833.681.3261.110.044183.27.21310.237.5488571.329116.94.60
57.15 mm/
2.250 in.
4.190.1651247.851.8841.250.049260.310.2496.474.35117402.698169.26.66
4.570.1801247.001.8501.240.049255.710.6046.974.68116782.599166.46.55
4.780.1881246.551.8331.240.049253.29.9277.224.85516452.551164.96.49
5.160.2031245.701.7991.230.049248.69.7877.705.1815842.45415846.38
5.590.2201244.751.7621.220.048243.49.5858.235.5315162.35115166.26
5.840.2301045.181.7391.220.048240.39.4608.475.6914872.30314876.06
6.100.2401043.621.7171.210.048237.39.3408.775.8914482.24414485.99
6.350.2501043.051.6951.210.048234.29.2219.076.1014102.18514105.92
6.600.2601042.491.6731.200.047231.19.1019.376.2913722.12713725.85
6.730.2651042.211.6621.200.047229.69.0419.516.3913532.09913535.81
7.210.2841041.141.6201.190.047223.88.81310.066.7612841.99112845.68
7.620.3001040.231.5841.180.046218.98.61710.517.0612271.90112275.56
7.950.3131039.501.5551.170.046214.98.45910.877.3011811.83011815.46
8.130.3201039.111.5401.170.046212.78.37811.067.4311571.79411575.41
8.640.3401037.981.4951.160.046206.68.13311.597.7910891.68910895.27
63.50 mm/
2.500 in.
4.190.1651454.202.1341.310.052294.811.6097.314.9122363.46722367.61
4.570.1801453.352.1001.300.051290.211.4247.865.2821653.35521657.50
4.780.1881452.902.0831.300.051287.811.3328.165.4821283.29921287.44
5.160.2031252.052.0491.290.051283.211.1478.625.7920683.20520687.20
5.330.2101251.662.0341.290.051281.011.0658.875.9620373.15720377.15
5.590.2201251.102.0121.280.050287.010.9459.236.2011913.08811917.08
5.840.2301250.531.9891.280.050274.910.8209.586.4819473.01619477.00
5.970.2351250.251.9781.270.050273.410.7608.756.5619242.98219246.97
6.100.2401249.971.9671.270.050271.810.7009.936.6719022.98419026.93
6.220.2451249.691.5651.270.050270.310.64110.106.7918802.91418806.90
6.350.2501249.401.9451.270.050268.810.58110.276.9018592.88118596.86
6.480.2551249.121.9341.260.050267.210.52110.447.0218372.84718376.82
6.600.2601248.841.9231.260.050265.710.46110.617.1318152.81418156.79
6.730.2651248.561.9121.260.050264.210.40110.787.2417942.78117946.75
6.860.2701248.281.9011.260.050262.610.34110.957.3617732.74917736.72
6.990.2751247.991.8891.250.049261.110.27611.117.4717512.71317516.68
7.110.2801247.711.8781.250.049259.510.21611.287.5817302.68117306.64
7.210.2841247.491.8701.250.049258.310.17311.417.6717142.65717146.61
66.68 mm/
2.625 in.
4.190.1651457.372.2591.340.053312.112.2897.685.1625133.8962048.02
4.570.1801456.532.2251.330.052307.512.1048.275.5624373.7772017.91
4.780.1881456.072.2081.320.052305.012.0128.595.7723983.7181997.85
5.160.2031455.232.1741.320.052300.411.8279.166.1623243.6021977.74
5.590.2201454.272.1371.310.052295.211.6259.815.5922423.4771947.62
6.100.2401453.142.0921.300.051289.111.38010.557.0921483.3291907.47
6.350.2501252.582.0701.290.051286.011.26110.837.2821113.2731857.27
6.600.2601252.012.0481.290.051283.011.14111.207.5220653.2021837.20
69.85 mm/
2.725 in.
4.570.1801459.702.3501.350.053324.812.7848.685.8427264.2232118.32
4.780.1881459.252.3331.350.053322.312.6929.016.0626844.1612108.26
5.160.2031458.402.2991.340.053317.712.5079.626.4726064.0382078.15
5.330.2101458.012.2841.340.053315.612.4259.916.6625703.9842068.10
5.590.2201457.452.2621.340.053312.512.30510.306.9225193.9062048.03
5.840.2301456.882.2391.330.052309.412.18010.707.1924693.8252027.95
6.100.2401456.322.2171.330.052306.412.06011.097.4524193.7492007.88
6.220.2451456.042.2061.320.052304.812.00111.287.5823943.7111997.85
6.350.2501455.752.1951.320.052303.311.94111.487.7123703.6731987.87
6.600.2601455.192.1731.320.052300.211.82111.867.9723213.5981977.47
75.41 mm/
2.969 in.
4.570.1801665.262.5691.400.055355.013.9759.496.3832585.0482339.18
4.780.1881664.812.5521.400.055352.613.8839.856.6232124.9802329.12
5.160.2031663.972.5181.390.055348.013.69810.527.0731274.8452299.01
5.330.2101663.572.5031.390.055345.813.61610.827.2730884.7872288.96
5.590.2201663.012.4811.380.054342.813.49711.267.5730324.7012268.88
5.840.2301662.442.4581.380.054339.713.37211.707.8629774.6122248.81
76.20 mm/
3.000 in.
5.160.2031664.752.5491.390.055352.313.86710.637.1432064.9682319.11
5.330.2101664.362.5341.390.055350.113.78510.947.3531664.9092309.06
5.590.2201663.802.5121.390.055347.013.66511.397.6531104.8222288.99
5.840.2301663.232.4891.380.055344.013.54011.827.9530544.7322268.91