IMB™ Graphite Rupture Disk

IMB

Inverted Monobloc

AIMB

Monobloc graphite disk with armor ring

IMBL

Monobloc graphite disk with fluoropolymer liner

AIMBL

Monobloc graphite disk with fluoropolymer liner and armor ring

Performance Features

Designed for gas, liquid and multi-phase service
Suitable for operating pressure to 80% of the marked burst pressure (85% of the minimum)
Vacuum resistant (additional vacuum support required for some burst pressures)
Vacuum resistant for burst pressures ≥ 22psig
Available with ASME “UD” (select 0% Manufacturing Design Range)
Pressure Equipment Directive “CE” marking and/or other International Certifications
Optional fluoropolymer liner/coating
Optional Armor ring
Optional HTA™ High Temperature Assembly
BS&B proprietary technology

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Sizes & Pressures
Burst Tolerance
Armored Option
Sensors
Documentation

Sizes & Pressures

IMB™, AIMB™, IMBL™ and AIMBL™ Disk Specifications Minimum/Maximum Pressure with Rating at 72° (22°C)

Disk Size		psig		barg		Disk Thickness
Disk Size		Burst Pressure				Disk Thickness		ANSI Flange Rating	DIN
in	mm	min	max	min	max	in	mm
0.5	15	25	250	1.7	17	0.6	16	150	10/16
0.5	15	25	1000	1.7	69	0.6	16	300/600	25/40
0.75	20	25	250	1.7	17	0.6	16	150	10/16
0.75	20	25	1000	1.7	69	0.6	16	300/600	25/40
1	25	10	250	0.7	17	0.9	22	150	10/16
1	25	10	1000	0.7	69	0.9	25	300/600	25/40
1.5	40	7	250	0.5	17	0.9	22	150	10/16
1.5	40	7	1000	0.5	69	1.0	25	300/600	25/40
2	50	2	250	0.1	10.3	0.9	22	150	10/16
2	50	3	500	0.2	34	1.0	25	300/600	25/40
3	80	1	250	0.1	17	0.9	22	150	10/16
3	80	2	500	0.1	34	1.2	32	300	25/40
4	100	1	250	0.1	17	0.9	22	150	10/16
4	100	1.5	500	0.1	34	1.3	32	300	25/40
6	150	1	170	0.1	12	0.9	22	150	10/16
6	150	1	450	0.1	31	1.8	44	300	25/40
8	200	0.5	170	0.04	12	1.1	29	150	10/16
8	200	0.5	450	0.04	31	2.3	57	300	25/40
10	250	0.3	150	0.02	10	1.5	38	150	10/16
12	300	0.3	150	0.02	10	2.0	51	150	10/16
14	350	0.3	150	0.02	10	2.3	57	150	10/16
16	400	0.3	150	0.02	10	2.5	64	150	10/16
18	450	0.3	150	0.02	10	2.8	70	150	10/16
20	500	0.3	150	0.02	10	3.0	76	150	10/16
24	600	0.3	150	0.02	3.4	3.0	76	150	10/16

Burst Tolerance

Marked Burst Pressure	Burst Tolerance
< 1 psig (0.07 barg)	-0/+0.75 psig (0/0.05 barg)
1 - 15 psig (0.07 barg < 1.03 barg)	± 0.75 psig (0.05 barg)
> 15 psig (1.03 barg)	± 5%

For sizing, see the BS&B website or contact BS&B for appropriate K_R

Example: If a Saf-T-Graf IMB type disk is ordered with a 29 psig (2 bar) burst pressure, it will burst between 27.5 psig (1.9 bar) and 30.5 psig (2.1 bar). For reduced tolerances contact BS&B.

Armored Option

Armor is recommended for all graphite disks for added safety and elimination of breakage during installation. Armor consists of a steel ring encircling the outside diameter of the graphite rupture disk.

Armor is standard on disks with burst pressures in excess of 150 psig or to fit ANSI Class 300 / 600 flanges. Carbon steel armor is standard with 300 series stainless steel as an option. Armor is recommended for applications where lateral blow out / loss of containment represents a safety concern.

Armor for disks sizes shown when rated pressures equal to or exceed values in the below chart.