Dimensions of Class 300 Spades for Series A Flanges A516 Gr70

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Table below provides spade and spacer dimensions made from ASTM A516 Gr70 plates for use on Class 300 Series A flanges.

Read the section at the bottom of table for basis of the calculations for dimensions of spade and spacer.

All dimensions are in "mm" unless noted otherwise.

Spade and Spacer Dimensions

Table for Class 300 Series A Flanges - Material of Spade and Spacer: ASTM A516 Gr70

Nom Size
Inches		 Pipe OD
mm		 Pressure
Thickness
of Spade
Inches		 Pressure
Thickness
of Spade
mm		 Pressure
Thickness + 3mm
'T'		 OD of Spade Spacer
mm
'A'		 ID of Spacer
mm
'D'		 Dimension
mm
'B'		 Dimension
mm
'C'
26 660.4 2.04 51.86 54.86 830 647 515 60
28 711.2 2.20 55.85 58.85 893 698 545 55
30 762 2.36 59.84 62.84 947 749 575 55
32 812.8 2.51 63.83 66.83 1001 800 600 55
34 863.6 2.67 67.82 70.82 1052 850 625 50
36 914.4 2.83 71.81 74.81 1113 901 655 55
38 965.2 2.98 75.80 78.80 1049 952 625 55
40 1016 3.14 79.79 82.79 1109 1003 655 55
42 1066.8 3.30 83.78 86.78 1160 1054 680 55
44 1117.6 3.46 87.77 90.77 1214 1104 705 45
46 1168.4 3.61 91.76 94.76 1268 1155 735 45
48 1219.2 3.77 95.75 98.75 1319 1206 760 40
50 1270 3.93 99.74 102.74 1373 1257 785 45
52 1320.8 4.08 103.73 106.73 1424 1308 810 45
54 1371.6 4.24 107.72 110.72 1487 1358 845 45
56 1422.4 4.40 111.71 114.71 1538 1409 870 40
58 1473.2 4.56 115.70 118.70 1589 1460 895 40
60 1524 4.71 119.69 122.69 1639 1511 920 40

Basis for calculation of Spade and Spacer Dimensions

Spades are used in piping systems to positively isolate sections of piping from one another. The spades are subject to the design pressure and hence the thickness of spades must be able to withstand the design pressure. As per para. 304.5.3(b) of ASME B31.3, the minimum required thickness of a permanent blank shall be calculated in accordance with following equation:

tm = dg\(\sqrt[]{\frac{3P}{16SEW}}\) + c

where

c = sum of allowances (mechanical + corrosion + mill tolerance)

dg = inside diameter of gasket for raised or flat face flanges, or gasket pitch diameter for ring joint and full retained gasketed flanges.

E = quality factor from Table A-1A or A-1B

P = design gage pressure

S = allowable stress value for material from Table A-1

W = weld strength reduction factor

In the calculation of spade thickness, we adopted a slightly different approach which provides conservative values. We know from para. 2.5 of ASME B16.5 that line blanks may be subjected to system tests at a pressure not to exceed 1.5 times the 38°C (100°F) rating rounded off to the next higher 1 bar (25 psi) increment. In the calculation we used a value of P that corresponds to the hydrostatic test pressure (1.5 x Flange Rating Pressure) rounded of to the next higher 25 psi increment.

For Class 300 the value of P considered is 1125 psi (750psi x 1.5 = 1125psi).

The value of allowable stress is taken as 90% SMYS of the material. The SMYS for ASTM A516 Gr70 material as per Table A-1 of ASME B31.3 is 38000 psi. Hence the value of allowable stress S = 34200 psi. E and W are considered as 1 in the equation.

Outside diameter of spade and spacer is calculated as bolt circle diameter of flange minus the bolt hole diameter-1.5mm.

Inside diameter of spacer is calculated as pipe outside diameter minus 6.35 mm.

Dimension B is calculated considering a projection of 75mm of center of handle hole from outside diameter of flange for sizes up to 46 inches and 100mm projection for sizes 48 inches and above.

While calculating dimension 'C' it is checked that the spade and spacer handle can pass through the gap between two adjacent bolts.

The thickness of spade excludes the projection for raised face.

Thickness T in table above assumes sum of allowances 'c' of 3mm. 

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