|
Note:
-
Material
for blanking disks shall be steel, either ASTM A 245, Grade
C, or ASTM A 285, Grade C, unless otherwise required.
-
Thicknesses
(T) shown are equal to, or greater than, 0.48 d p/s, wherein
D = outside diameter of pipe, in; P = design pressure, PSI;
and S = 24, 750 PSI (which is 82.5 % of yield point and
45 % of ultimate tensile strength)
-
Pressure
given in table above are allowable working pressures at
500 F maximum temperature. Test pressures of twice the above-listed
working pressures are safe. However, such test pressures
will permanently deform disks of certain thickness diameter
combinations given in table.
-
Table
on next page gives allowable working pressures for each
standard disk thickness when used in various sizes of pipe.
-
For
corrosive services, steel disks may be used with a thin
liner of an appropriate corrosion-resistant alloy, or clad-steel
disks maybe used. Solid stainless steel disks shall be of
same thickness shall be used instead of .1196". Thickness and pressure ratings specified in table above are not applicable
to clad steel disks and solid metal disks of alloys other
than stainless steel. If such disks are required, they shall
be designed to suit operating conditions.
|
Nominal
Pipe Size
|
|
Allowable
|
Working
|
Pressure
|
(PSI)
|
|
|
(inches)
|
T
= .1196"
|
T
= 3/16"
|
T
= 1/4"
|
T
=3/8"
|
T
= 1/2"
|
T
= 5/8"
|
|
1/2
|
2150
|
|
|
|
|
|
|
3/4
|
1400
|
|
|
|
|
|
|
1
|
890
|
|
|
|
|
|
|
1
1/2
|
425
|
1050
|
|
|
|
|
|
2
|
275
|
670
|
1200
|
|
|
|
|
3
|
125
|
310
|
550
|
1240
|
|
|
|
4
|
75
|
185
|
335
|
750
|
|
|
|
6
|
35
|
85
|
155
|
345
|
615
|
965
|
|
8
|
20
|
50
|
90
|
206
|
360
|
570
|
|
10
|
13
|
33
|
60
|
130
|
235
|
365
|
|
12
|
9.0
|
23
|
40
|
93
|
165
|
260
|
|
14
|
8.0
|
19
|
35
|
77
|
138
|
215
|
|
16
|
6.0
|
15
|
26
|
60
|
105
|
165
|
|
18
|
5.0
|
12
|
21
|
47
|
83
|
130
|
|
20
|
4.0
|
9.0
|
17
|
38
|
67
|
105
|
|
24
|
2.7
|
6.6
|
12
|
26
|
47
|
73
|
|
