Dimensions of Class 150 Spades for Series A Flanges A516 Gr70

Expired

Table below provides spade and spacer dimensions for use on Class 150 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 150 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 1.29 32.80 35.80 769 647 510 50
28 711.2 1.39 35.33 38.33 827 698 540 55
30 762 1.49 37.85 40.85 877 749 565 60
32 812.8 1.59 40.37 43.37 935 800 605 60
34 863.6 1.69 42.89 45.89 986 850 630 60
36 914.4 1.79 45.42 48.42 1043 901 660 60
38 965.2 1.89 47.94 50.94 1106 952 695 60
40 1016 1.99 50.46 53.46 1157 1003 720 60
42 1066.8 2.09 52.99 55.99 1214 1054 750 60
44 1117.6 2.19 55.51 58.51 1271 1104 775 60
46 1168.4 2.28 58.03 61.03 1322 1155 800 60
48 1219.2 2.38 60.56 63.56 1379 1206 855 60
50 1270 2.48 63.08 66.08 1430 1257 885 60
52 1320.8 2.58 65.60 68.60 1487 1308 915 60
54 1371.6 2.68 68.13 71.13 1544 1358 940 60
56 1422.4 2.78 70.65 73.65 1601 1409 975 60
58 1473.2 2.88 73.17 76.17 1658 1460 1000 60
60 1524 2.98 75.70 78.70 1709 1511 1025 60

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 150 the value of P considered is 450 psi (285psi x 1.5 = 427.5psi rounded to 450psi)

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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