MIL-DTL-5513D
TABLE II. Type and classes designators.
Designator
Type/Class
Characteristics
Aluminum
I
Type I
-65° to +160°F (-55° to +70°C) temperature range
II
Type II
-65° to +275°F (-55° to +135°C) temperature range
Where the nominal cut out pressure at the main pressure controlling
1.5
Class 1500
device is 1500 psig
Steel
III
Type I
-65° to +160°F (-55° to +70°C) temperature range
IV
Type II
-65° to +275°F (-55° to +135°C) temperature range
V
Type III
-65° to +450°F (-55° to +232°C) temperature range
Where the nominal cut out pressure at the main pressure controlling
1.5
Class 1500
device is 1500 psig
Where the nominal cut out pressure at the main pressure controlling
3
Class 3000
device is 3000 psig
Where the nominal cut out pressure at the main pressure controlling
4
Class 4000
device is 4000 psig
Where the nominal cut out pressure at the main pressure controlling
5
Class 5000
device is 5000 psig
Corrosion resistant steel (CRES)
VI
Type I
-65° to +160°F (-55° to +70°C) temperature range
VI
Type II
-65° to +275°F (-55° to +135°C) temperature range
VIII
Type III
-65° to +450°F (-55° to +232°C) temperature range
Where the nominal cut out pressure at the main pressure controlling
1.5
Class 1500
device is 1500 psig
Where the nominal cut out pressure at the main pressure controlling
3
Class 3000
device is 3000 psig
Where the nominal cut out pressure at the main pressure controlling
4
Class 4000
device is 4000 psig
Where the nominal cut out pressure at the main pressure controlling
5
Class 5000
device is 5000 psig
Titanium
IX
Type I
-65° to +160°F (-55° to +70°C) temperature range
X
Type II
-65° to +275°F (-55° to +135°C) temperature range
XI
Type III
-65° to +450°F (-55° to +232°C) temperature range
Where the nominal cut out pressure at the main pressure controlling
1.5
Class 1500
device is 1500 psig
Where the nominal cut out pressure at the main pressure controlling
3
Class 3000
device is 3000 psig
Where the nominal cut out pressure at the main pressure controlling
4
Class 4000
device is 4000 psig
3
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