HENDERSON - Explosion Vents

Explosion Vents

Explosion Protection

Explosion Vents

Essentially, there are two layers of stainless steel sandwiching a Teflon sheet. The latter acts as a pressure seal. The two layers of stainless steel are precision cut on a CNC laser in the factory selected burst pattern. The laser cuts slots which are terminated at either end with holes to minimize any stress concentrations at these points. There is a "bridge" or "tab" between the slots which is not cut.

There are several variables which can be manipulated to "fine tune" the release pressure: the thickness of the Teflon seal to a minor degree, the thickness of the stainless steel sheet material, and the width & number of tabs. Destructive tests are performed to establish the release pressure at ambient temperature.

44"-44" Installed HIS Vents

Vent/Door Sizing Program

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Various Vent designs available.

ECV Rectangular Explosion Vent Sizes and Pressures

VENT SIZE		RELIEF AREA		MINIMUM BURST PRESSURE
Inch	Cm	Sq. Ft	Sq. Meters	psig	mbarg
12 X 12	30 X 30	1	0.09	2	138
12 X 18	30 X 46	1.5	0.14	1.5	103
12 X 24	30 X 61	2	0.18	1.5	103
18 X 18	46 X 46	2.25	0.21	1	69
18 X 24	46 X 61	3	0.28	1	69
18 X 30	46 X 76	3.75	0.35	1	69
18 X 36	46 X 89	4.38	0.41	1	69
24 X 24	61 X 61	4	0.37	1	69
24 X 30	61 X 76	5	0.46	1	69
24 X 36	61 X 91	6	0.56	0.5	34
24 X 42	61 X 107	7	0.65	0.5	34
30 X 30	76 X 76	6.25	0.58	0.5	34
30 X 36	76 X 91	7.5	0.69	0.5	34
30 X 44	76 X 112	9.17	0.85	0.5	34
36 X 36	91 X 91	9	0.83	0.5	34
36 X 44	91 X 112	11	1.02	0.5	34
36 X 48	91 X 122	12	1.11	0.5	34
44 X 44	112 X 112	13.44	1.25	0.5	34
44 X 54	112 X 137	16.5	1.53	0.5	34
44 X 69	112 X 175	21.08	1.96	0.5	34

ECV Round Explosion Vent Sizes and Pressures

VENT SIZE		RELIEF AREA		MINIMUM BURST PRESSURE
Inch	Cm.	Sq. Ft	Sq. Meters	psig	mbarg
12	30	0.78	0.07	2	138
14	36	1.07	0.1	1.5	103
16	41	1.4	0.13	1.3	90
18	46	1.77	0.16	1	69
20	51	2.18	0.2	1	69
24	61	3.14	0.29	1	69
30	76	4.91	0.46	0.5	34
32	81	5.59	0.52	0.5	34
36	91	7.07	0.66	0.5	34
40	102	8.73	0.81	0.5	34
42	107	9.62	0.89	0.5	34

Other Sizes Available upon Request

Notes

Maximum burst pressure is 8 psig (552 mbar)
Maximum operating temperature is 450°F (230°C)
Applicable tolerances:
- ±0.5 psi (34 mbar) for pressures >=1.0 psi (69 mbar)
- ±0.3 psi (21 mbar) for pressures <1.0 psi (69 mbar)
Maximum tolerating working pressure is 50 % of the rated release pressure, which for design purposes, should be 50% of the lower end of the tolerance (should the be the upper end of the tolerance for the purposes of relief area sizing)
Standard construction is SST/TFE/SST - other materials available on request
Various other styles/construction accessories and special vent styles to accommodate high vacuum service are available - please contact us for more details.