INVERTED Type
the best choice for higher burst ratings
ZOOK INVERTED STYLE RUPTURE DISK
• Sizes 1/29 thru 249 diameters
• Designed to fit ASME B16.5 Class 150 and 300 flanges
• Burst ratings 0.25 to 1,000 psig or higher
• 0% manufacturing range
• Flat surface of the disk contacts the process media
• Operating pressures to 90% of the disk’s marked burst pressure
(Contact ZOOK for operating ratio for burst pressures below 40 psig)
• Temperature ratings –290°F to +700°F (–179°C to +371°C) Maximum
temperature rating without insulation is 430°F (221°C) or 700°F (371°C)
with insulation. Contact ZOOK for higher temperature ratings. The
specified temperature shall be at the disk location at the time
when the disk is expected to rupture
• Stocked INVERTED Disks, ready for immediate shipment.
Sizes: 19, 1-1/29, 29, 39 to fit ASME B16.5 Class 300 flanges
Burst Ratings: 175, 200, 225, 250, 275, 300 psig @ 72°F (22°C)
Note: Sizes 39 through 89ASME B16.5 Class 150 flanges with
burst ratings 125, 150 psig @ 72°F (22°C) are stocked in
INVERTED type
• ASME B16.5 Class 300 disks are armored
• ASME UD marking available
Type
INVERTED
Krgl
Gasket
Gasket
FLOW
Certified Flow Resistance Factor (Krgl)
ASME B16.5
Flange
0.64
Specifications – ASME B16.5 Class 150
Minimum
Nominal
net flow area
Disk
Disk
(MNFA)
Sizes
Sizes
sq. inches
Disk Dimensions
Burst Ratings
Diameter
Thickness*
psig
StandardInsulated
I.D.O.D.
Min.
Max.
DiskUnit
1/29 0.300.62291-3/495/891-3/49
25
above 1000
3/49 0.530.82492-1/895/891-3/49
25
above 1000
190.78 192-1/297/892-1/49
10
above 1000
1-1/291.76 1-1/293-1/497/892-1/497
1000
293.14 29
497/892-1/493
300
397.06 395-1/497/892-1/492
300
4912.56 496-3/497/892-1/491.5
250
6928.27 698-5/897/892-1/491
170
8950.02 8910-7/891-1/892-3/490.50
170
10978.53 10913-1/491-1/293-3/890.25
150
129113.09 129169294-3/890.25
150
149 137.8813-1/4917-5/892-1/494-7/890.25
150
169 182.6515-1/4920-1/892-1/295-3/890.25
150
189 233.7017-1/4921-1/292-3/495-7/89
0.25
below 150
209 291.0319-1/4923-3/49396-3/89
0.25
below 150
249 424.5523-1/4928-1/89396-3/89
0.25
below 150
Specifications – ASME B16.5 Class 300
1/29 0.300.6229295/891-3/49
25
above 1000
3/49 0.530.82492-1/295/891-3/49
25
above 1000
190.78192-3/49192-1/29
10
above 1000
1-1/291.761-1/293-5/89192-1/297
1000
293.14294-1/49192-1/293
500
397.06395-3/491-1/49392 500
4912.5649
791-1/49391.5 500
6928.27699-3/491-3/49491 450
8950.0289
1292-1/49590.50 450
4
*Standard disk thickness does not include gaskets.
Insulated unit thickness includes all gaskets
Note: Maximum pressure rating of ASME B16.5 Class 150
flanges is 290 psig @ 100°F (38°C).
ASME B16.5 Class 300 flanges is 750 psig @ 100°F
(38°C). The maximum pressure rating is lower at
higher temperatures. Reference ASME/ANSI B16.5
ZOOK service personnel are available 24 hours-a-day, 7 days-a-week, 365 days-a-year