An explosion can result from an ignition of a combustible gas, mist or dust when mixed with air during processing, handling or storage operations. A rapid rise in pressure occurs in the containing structure, and if it is not of adequate strength to withstand the deflagration pressure, extensive damage and injury to personnel can occur.
Explosion vents are low burst pressure membranes of calculated area fixed over an opening on the structure to be protected. In the event of a deflagration the vents provide a rapid and unrestricted opening at a predetermined burst pressure (Pstat) allowing combustion gases to expand and flow through the open vent. The required relief area necessary to protect plant or equipment may be determined by using the most current standards of NFPA 68 or VDI 3673.
The most suitable explosion vent may be selected by matching the information in this catalog with the particular operating conditions. |
The Vent-Saf® explosion vents can protect industrial equipment including silos, dust collectors, cyclones, conveyers, dryers…and many more.
More Features
-
No fragile PTFE seal that may puncture and admit moisture.
-
Operating pressures up to 60% of the minimum tagged pressure rating (80% under certain conditions).
-
Thermal insulation available to permit use in operating temperatures to 2000°F/1093°C, to reduce heat loss or prevent condensation.
-
Supplied with integral gaskets ready for installation.
-
Fail-safe design, if damaged it will provide a relief opening below its rated pressure.
Types VSP, VSS & VSE
Operating Pressure The VSP, VSS and VSE vents are suitable for positive pressures up to 60% of the minimum burst pressure. However , under certain conditions up to 80% of the minimum burst pressure is possible. Consult BS&B Safety Systems, Inc.
Vent OperationThe perimeter of the rectangular or square vents are laser cut on three sides in a stitch pattern. The fourth side acts as a hinge, and retains the central section, controlling fragmentation upon opening of the vent The laser cut slits in the vent are covered by integral gaskets or sealing material to achieve a leak tight sealed construction.
Materials of ConstructionThe VSP, VSE and VSS explosion vents in 316SS* standard material are available with a variety of gasket and seal materials depending on the application.
|
Gasket
|
Seal
|
Standard designs’ |
Silicone sponge
|
Silicone sponge |
Sanitary/Aseptic Design |
White solid silicone (FDA)
|
RTV (FDA approved)
|
High Temperature Applications(above 300°F,150°C) |
Red Solid silicone
|
RTV (high temperature)
|
Safety Frames - Rectangular vents can be mounted in lightweight angle profile Safety Frames. Round vents can be installed between standard weld neck flanges in accordance with ANSI 150 or DIN PN10 or in lightweight angle profile frames. Safety frames are available in 304SS or carbon steel.
The frames are designed to either bolt or weld on to the equipment to be protected. If frames are manufactured by the user, details of bolt sizes, spacing and dimensions must be given to BS&B Safety Systems, Inc. prior to vent manufacture to ensure correct vent performance.
Operating Temperature - The standard explosion vent may be used in temperatures –40°F to 300°F (-40°C to 150°C), the sanitary/aseptic design –80°F to 450°F (-62°C to 232°C) and with solid silicone gaskets the RTV (High Temperature) seal –80°F to 500°F (-62°C to 260°C). Alternative vent construction permits higher temperatures.
Sanitary/Aseptic Applications - These explosion vents of single section stainless steel construction with smooth internal surface finish are free of cavities. Solid White silicone gaskets are supplied fitted to the vent flange area and FDA approved RTV sealing material applied to the vent perimeter to achieve a sanitary/aseptic construction.
Thermal Insulation - Thermally insulated vents using either urethane or ceramic material may be offered to prevent heat loss or condensation on the vent. Insulation will also permit their use in high temperature service up to 2000°F (1093°C). The insulation is integral to the panel construction, requiring no additional field installation. The type and thickness of the insulation material will be selected to suit the operating temperature requirements. The additional insulation is taken into consideration when the burst pressure is determined. An optional stainless steel weather cover is available to provide added protection of the insulation against rain, ice or debris.
Burst Sensor - The MBS™ Type magnetic sensor is available to provide immediate warning upon bursting of the explosion vent. A magnetic activator is fitted to the vent and a proximity switch attached to the safety frame. Warning of a burst vent is given when the current flowing through the sensor is disrupted giving an open circuit signal. The sensor is suitable for use in hazardous areas provided a suitable power level or Zener barrier is used to meet intrinsically safe requirements. An armored style sensor is also available.
RECTANGULAR VSP, VSS AND VSE VENT DIMENSIONS
|
Nom. Size
|
A
|
B
|
C
|
D
|
Net Relief
|
|
in.
|
in.
|
mm.
|
in.
|
mm.
|
in.
|
mm.
|
in.
|
mm.
|
in. sq.
|
cm. sq.
|
|
9.0 x 12.0
|
12.0
|
304.8
|
9.0
|
228.6
|
16.0
|
406.4
|
13.0
|
330.2
|
98
|
631
|
|
12.0 x 18.0
|
18.0
|
457.2
|
12.0
|
304.8
|
22.0
|
558.8
|
16.0
|
406.4
|
201
|
1298
|
|
18.0 x 18.0
|
18.0
|
457.2
|
18.0
|
457.2
|
22.0
|
558.8
|
22.0
|
558.8
|
306
|
1976
|
|
18.0 x 24.0
|
24.0
|
609.6
|
18.0
|
457.2
|
28.0
|
711.2
|
22.0
|
558.8
|
411
|
2653
|
|
18.0 x 30.0
|
30.0
|
762.0
|
18.0
|
457.2
|
34.0
|
863.6
|
22.0
|
558.8
|
516
|
3331
|
|
18.0 x 36.0
|
36.0
|
914.4
|
18.0
|
457.2
|
40.0
|
1016.0
|
22.0
|
558.8
|
621
|
4008
|
|
19.0 x 59.0
|
59.0
|
1498.6
|
19.0
|
482.6
|
63.0
|
1600.2
|
23.0
|
584.2
|
1082
|
6982
|
|
24.0 x 24.0
|
24.0
|
609.6
|
24.0
|
609.6
|
28.0
|
711.2
|
28.0
|
711.2
|
552
|
3563
|
|
24.0 x 30.0
|
30.0
|
762.0
|
24.0
|
609.6
|
34.0
|
863.6
|
28.0
|
711.2
|
693
|
4473
|
|
24.0 x 36.0
|
36.0
|
914.4
|
24.0
|
609.6
|
40.0
|
1016.0
|
28.0
|
711.2
|
834
|
5382
|
|
24.0 x 44.0
|
44.0
|
1117.6
|
24.0
|
609.6
|
48.0
|
1219.2
|
28.0
|
711.2
|
1022
|
6595
|
|
24.0 x 48.0
|
48.0
|
1219.2
|
24.0
|
609.6
|
52.0
|
1320.8
|
28.0
|
711.2
|
1116
|
7202
|
|
29.0 x 59.0
|
59.0
|
1498.6
|
29.0
|
736.6
|
63.0
|
1600.2
|
33.0
|
838.2
|
1667
|
10756
|
|
30.0 x 36.0
|
36.0
|
914.4
|
30.0
|
762.0
|
40.0
|
1016.0
|
34.0
|
863.6
|
1047
|
6756
|
|
30.0 x 48.0
|
48.0
|
1219.2
|
30.0
|
762.0
|
52.0
|
1320.8
|
34.0
|
863.6
|
1401
|
9040
|
|
32.5 x 65.0
|
65.0
|
1651.0
|
32.5
|
825.5
|
69.0
|
1752.6
|
36.5
|
927.1
|
2064
|
13316
|
|
36.0 x 36.0
|
36.0
|
914.4
|
36.0
|
914.4
|
40.0
|
1016.0
|
40.0
|
1016.0
|
1260
|
8131
|
|
44.5 x 44.5
|
44.5
|
1130.3
|
44.5
|
1130.3
|
48.5
|
1231.9
|
48.5
|
1231.9
|
1936
|
12490
|
|
44.5 x 68.0
|
68.0
|
1727.2
|
44.5
|
1130.3
|
72.0
|
1828.8
|
48.5
|
1231.9
|
2970
|
19161
|
ROUND VSP AND VSE VENT DIMENSIONS
Nominal Size |
A |
B |
Bolt Hole Design |
Net Relief |
Outside Dimension |
Inside Dimension |
Bolt Circle |
No. of Holes |
Hole Dia. |
in. |
mm. |
in. |
mm. |
in. |
mm. |
in. |
mm. |
in. |
mm. |
in. sq. |
cm. sq. |
8.0 |
200.0 |
13.50 |
342.90 |
8.00 |
203.20 |
11.750 |
298.45 |
8 |
0.875 |
22.23 |
44 |
284 |
10.0 |
250.0 |
16.00 |
406.40 |
10.00 |
254.00 |
14.250 |
361.95 |
12 |
1.000 |
25.40 |
71 |
458 |
12.0 |
300.0 |
19.00 |
482.60 |
12.00 |
304.80 |
17.000 |
431.80 |
12 |
1.000 |
25.40 |
104 |
671 |
14.0 |
350.0 |
21.00 |
533.40 |
13.25 |
336.55 |
18.750 |
476.25 |
12 |
1.125 |
28.58 |
130 |
839 |
16.0 |
400.0 |
19.75 |
501.65 |
16.25 |
412.75 |
18.125 |
460.38 |
16 |
0.500 |
12.70 |
195 |
1258 |
18.0 |
450.0 |
21.75 |
552.45 |
18.25 |
463.55 |
20.125 |
511.18 |
16 |
0.500 |
12.70 |
247 |
1594 |
20.0 |
500.0 |
23.75 |
603.25 |
20.25 |
514.35 |
22.125 |
561.98 |
20 |
0.500 |
12.70 |
306 |
1974 |
24.0 |
600.0 |
27.75 |
704.85 |
24.25 |
615.95 |
26.125 |
663.58 |
20 |
0.625 |
15.88 |
443 |
2858 |
30.0 |
750.0 |
33.75 |
857.25 |
30.25 |
768.35 |
32.500 |
825.50 |
28 |
0.625 |
15.88 |
695 |
4484 |
32.0 |
800.0 |
35.75 |
908.05 |
32.25 |
819.15 |
34.500 |
876.30 |
28 |
0.625 |
15.88 |
792 |
5110 |
36.0 |
900.0 |
39.75 |
1009.65 |
36.25 |
920.75 |
38.500 |
977.90 |
32 |
0.625 |
15.88 |
1004 |
6477 |
40.0 |
1000.0 |
43.75 |
1111.25 |
40.25 |
1022.35 |
42.500 |
1079.50 |
36 |
0.625 |
15.88 |
1241 |
8006 |
44.0 |
1100.0 |
47.75 |
1212.85 |
44.25 |
1123.95 |
46.500 |
1181.10 |
40 |
0.625 |
15.88 |
1503 |
9697 |
Downloads:
-  BS&B Explosion Vents Brochure
|
