BPIV™ Buckling Pin Relief Technology

Performance Features

Sizes from 2" to 78" (50mm to 1,950mm)
Externally reset in minutes, without the need to open the pipeline
Continuous processing (fast inline external reset)
Hazardous service (limits operator exposure)
Large line size (available up to 78”)
High flow capacity
Low Pressure Drop – low Krgl – 1.22
High operating pressure to set pressure ratio, 95% on minimum.
Cryogenic designs available
ASME “UD” stamped, section XIII
European Pressure Equipment Directive “CE” marked

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Set Pressures
Tolerance
Materials & Accessories
Documentation

Set Pressures

BPIV™ Capabilities

Inlet Size	Flow Area	Set Pressure Range
2 NPS	2.75 sq in	15 - 2250 psi
3 NPS	6 sq in	15 - 2250 psi
4 NPS	10 sq in	15 - 2250 psi
6 NPS	23.5 sq in	1 - 2250 psi
8 NPS	39.65 sq in	1 - 2250 psi
10 NPS	62.48 sq in	1 - 2250 psi
12 NPS	90.5 sq in	1 - 2250 psi
14 NPS	109 sq in	1 - 2250 psi
16 NPS	149 sq in	1 - 1440 psi
18 NPS	196.2 sq in	1 - 1440 psi
20 NPS	239.1 sq in	1 - 1440 psi
24 NPS	367.6 sq in	1 - 720 psi
30 NPS	601 sq in	1 - 720 psi
32 NPS	614 sq in	1 - 720 psi
34 NPS	695 sq in	1 - 720 psi
36 NPS	781 sq in	1 - 720 psi
38 NPS	872 sq in	1 - 720 psi
40 NPS	968 sq in	1 - 720 psi
42 NPS	1069 sq in	1 - 720 psi
44 NPS	1175 sq in	1 - 720 psi
46 NPS	1286 sq in	1 - 720 psi
48 NPS	1403 sq in	1 - 720 psi
52 NPS	1650 sq in	1 - 720 psi
54 NPS	1784 sq in	1 - 720 psi
56 NPS	1918 sq in	1 - 720 psi
60 NPS	2206 sq in	1 - 720 psi

The BS&B BPIV set pressure is controlled by a precision buckling pin which is calibrated to respond to the forces generated by inlet pressure acting on the valve disk independent of any back pressure that may be present. When the pin activates, the valve disc rotates to achieve the flow area.

BPIV Buckling Pin Mechanism
(Closed Position)

Burst Tolerance

Marked Burst Pressure	Burst Tolerance
≤ 40 psig (2.76 barg)	± 2 psig (0.138 barg)
> 40 psig (2.76 barg)	± 5%

Dimensions

Sales drawings are avaliable upon request.

Materials of Construction

Minimum Standard Materials

	Carbon Steel	Stainless Steel	Low Temp Carbon Steel
Body	✓	✓	✓
Disc and Shaft (Internals)		✓

Alternative Materials availabile upon request, e.g Inconel 625, Duplex, Supler Duplex

Flange Torque*

Click here to see complete table.

Accessories

BS&B supplies many of the Accessories required to safely and conveniently install our overpressure relief devices and complementary products. Through our professional team and global network of sales engineers and procurement personnel, we are able to provide the highest quality accessory products to meet your installation requirements.

Saf-T-Pin™ Buckling Pin Cartridge

The BPAV can be provided with buckling pin cartridges that are installed like an electrical fuse. The Saf-T-Pin buckling pin cartridge allows a “quick-change” option of buckling pins with a simple push-in/pull-out design for installation within the enclosure. Each Saf-T-Pin cartridge contains a calibrated buckling pin that is perfectly mounted for optimum performance.