Table below provides spade and spacer dimensions made from ASTM A516 Gr70 plates for use on Class 900 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.

Table for Class 900 Series A Flanges - Material of Spade and Spacer: ASTM A516 Gr70

Nom Size
Inches
Pipe OD
mm
Pressure
Thickness
Inches
Pressure
Thickness
mm
Pressure
Thickness + 3mm
'T'
mm
'A'
ID of Spacer
mm
'D'
Dimension
mm
'B'
Dimension
mm
'C'
26 660.4 3.54 89.83 92.83 877 647 540 65
28 711.2 3.81 96.74 99.74 941 698 570 65
30 762 4.08 103.65 106.65 1005 749 605 65
32 812.8 4.35 110.56 113.56 1068 800 635 65
34 863.6 4.62 117.47 120.47 1132 850 665 65
36 914.4 4.90 124.38 127.38 1195 901 700 65
38 965.2 5.17 131.29 134.29 1195 952 700 65
40 1016 5.44 138.20 141.20 1246 1003 725 65
42 1066.8 5.71 145.11 148.11 1297 1054 750 65
44 1117.6 5.99 152.02 155.02 1363 1104 780 65
46 1168.4 6.26 158.93 161.93 1430 1155 815 65
48 1219.2 6.53 165.84 168.84 1481 1206 840 65

## 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 900 the value of P considered is 3375psi (2250psi x 1.5 = 3375psi)

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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