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Products > Bursting Disc Plugs > Bursting Disc Plugs Details

Elfab bursting disc plugs have been specifically developed to provide a simple to install pressure relief solution.

This type of device is suitable for a wide range of applications, such as cryogenics, gas cylinders, autoclaves and portable compressed air systems.

The standard range offers various disc and holder combinations to produce an extensive range of burst pressures and connection options.

However, if your design specification falls outside the scope of the standard range, Elfab can design and develop custom engineered pressure relief solutions to meet your individual system requirements – see OEM.

Wide range of burst pressures
Gas and vapour compatible
Various inlet & outlet combinations
Simple installation
Excellent leak integrity
Tamperproof

Specifications
THREAD SIZES	1/4” to 3/4”
THREAD TYPES	NPT or BSPT
BURST PRESSURE RANGE	2.5 to 200 barg (37 to 2900 psig)
TEMPERATURE RANGE	-40 to 400°C (-40 to 752°F)
MAXIMUM OPERATING RATIO	90% of min. burst pressure (2.5 – 55 barg) 85% of min. burst pressure (55 – 200 barg)
PERFORMANCE TOLERANCE	+/- 10% (2.5 – 55 barg) +/- 5% (55 – 200 barg)
LEAK INTREGRITY	brass 1x10^-5cc/sec, Stainless Steel 1x10^-7cc/sec
VACUUM SERVICE	yes
FLUID COMPATIBILITY	gas or vapour
TAMPERPROOF	yes
DISC TYPES	Uni-Gard (compression loaded) Conventional (tension loaded)
DISC MATERIAL	nickel or stainless steel
FRAGMENTATION	may fragment on burst
HOLDER DESIGN / MATERIAL	screwed/bonded brass with Viton® O-ring or electron beam welded stainless steel

Connection, sizes and pressures

Brass Plugs, Screwed and Bonded

CONNECTIONS *		BURST PRESSURE RANGE @ 20°C		OVERALL LENGTH^† ‘ A’	HEXAGON A/F. ‘ B’
Inlet	Outlet	Minimum	Maximum
¼” MALE	¼” MALE	3 barg (44 ps ig)	70 barg (1015 ps ig)	57mm (2 ¼”)	31.75mm (1 ¼”)
	¼” FEMALE
	BAFFLE			48mm (1 7/8”)
1/2 MALE	½” MALE			57mm (2 ¼”)
	½” FEMALE
	BAFFLE			48mm (1 7/8”)
¾” MALE	¾” MALE	2.5 barg (37 ps ig)	40 barg (580 ps ig)	68mm (2 11/16”)	38.1 mm (1 ½”)
	¾” FEMALE
	BAFFLE			57 mm (2 ¼”)

*Available in either NPT or BSPT thread ^†For burst pressures above 55barg add 3mm (1/8”) to overall length

Stainless Steel Plugs, Electron Beam Welded

CONNECTIONS *		BURST PRESSURE RANGE @ 20°C		OVERALL LENGTH ‘ A’	HEXAGON A/F. ‘ B’
Inlet	Outlet	Minimum	Maximum
¼” MALE	¼” MALE	3 barg (44 ps ig)	200 barg (2900 ps ig)	49mm (1 15/16”)	31.75mm (1 ¼”)
	¼” FEMALE
	BAFFLE			46mm (1 13/16”)
1/2” MALE	1/2” MALE			49mm (1 15/16”)
	½” FEMALE
	BAFFLE			46mm (1 13/16”)
¾” MALE	¾” MALE	2.5 barg (37 ps ig)	40 barg (580 ps ig)	56mm (2 1/4”)	31.75 mm (1 ¼”)
	¾” FEMALE
	BAFFLE			53 mm (2 1/16”)

*Available in either NPT or BSPT thread

General specifications

Body Material / Finish
Brass
Stainless Steel
General surface finish 1.6µmRa (0.8µmRa in critical areas). All burrs and sharp edges removed unless otherwise stated.

Disc Material
Nickel
Stainless Steel

Burst Pressure Range

Disc Type	Disc Material	Nominal Bore of Disc (thread sizes)	Burst Pressure Range @ 20°C				Tolerance	Maximum Operating Ratio
			Brass		Stainless Steel
			Min	Max	Min	Max
Uni-Gard (compression loaded)	Nickel	15mm (1/4”, ½”)	3 barg (44 psig)	55 barg (800 psig)	3 barg (44 psig)	55 barg (800 psig)	+/- 10%	90%
	Nickel	19mm (3/4”)	2.5 barg (37 psig)	40 barg (580 ps ig)	2.5 barg (37 psig)	40 barg (580 psig)
	Stainless Steel	15mm (1/4”, ½”)	4 barg (58 psig)	55 barg (800 psig)	4 barg (58 psig)	55 barg (800 psig)
	Stainless Steel	19mm (3/4”)	4 barg (58 psig)	40 barg (580 psig)	4 barg (58 psig)	40 barg (580 psig)
Conventional (tension loaded)	Nickel	15mm (1/4”, ½”)	55 barg (800 psig)	70 barg (1015 psig)	55 barg (800 psig)	200 barg (2900 psig)	+/- 5%	85%
	Nickel	19mm (3/4”)	N/A	N/A	N/A	N/A
	Stainless Steel	15mm (1/4”, ½”)	55 barg (800 psig)	70 barg (1015 psig)	55 barg (800 psig)	200 barg (2900 psig)
	Stainless Steel	19mm (3/4”)	N/A	N/A	N/A	N/A

Temperature Range

Body Material	Temperature, °C (°F)
	Standard		Alternative*
	Min	Max	Min	Max
Brass	15 (59)	200 (392)	-20 (-4)	200 (392)
Stainless Steel	15 (59)	200 (392)	-40 (-40)	400 (752)

*An additional charge is required due to extra temperature testing requirements

Leak Tightness

Brass Body

Screwed and bonded with ‘Loc-Tite 290 Threadlocker’
Viton® O-ring used with temperature range -30 to 204°C (-20 to 400°F)
Helium Leak tested and tight to 1x10^-5 cc/sec

Stainless Steel Body

Electron Beam Welded to withstand maximum burst pressure of the disc +10%
Helium Leak tested and tight to 1x10^-7 cc/sec

Free Flow Area (Minimum Net Flow Area)

Body Material	Thread Size	Free Flow Area (MNFA)
		Male Outlet		Female Outlet		Baffle Outlet
		mm²	inch²	mm²	inch²	mm²	inch²
Brass	¼”	28	0.0438	28	0.0438	28	0.0438
	½”	127	0.1964	127	0.1964	127	0.1964
	¾”	286	0.4441	286	0.4441	286	0.4441
Stainless Steel	¼”	28	0.0438	28	0.0438	28	0.0438
	½”	127	0.1964	127	0.1964	127	0.1964
	¾”	286	0.4441	286	0.4441	286	0.4441

CE Marking
Conforms with the requirements of:
Annex III, Module H1 of the Pressure Equipment Directive 97/23/EC, and schedule 4 of the Pressure Regulations 1999

Pressure Intelligence

The data shown on these sheets represents the standard offering from Elfab. Depending upon the requirements of your application, Elfab maybe able to provide a solution based on this product but outside the standard operating parameters. In addition, Elfab produces an extensive range of alternative products which maybe more suitable for your requirements.

As a result of extensive testing, Elfab can advise on these choices, or on other technical matters, such as discharge requirements, temperature testing, material selection and corrosion resistance, customised designs and burst detection.

To discuss your specific product or service requirements please contact your Elfab representative.