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Specifications

High Pressure Safety Heads up to 60,000 PSI
The male inlet design can be inserted directly into the tubing connections of valves and various fittings such as tees and crosses, or located in pressure vessels.
Outlet connections are 3/8" pipe (NPT). This outlet may be connected to a suitable discharge line to vent pressure to a safe location in the event of bursting of the rupture disc. Torque required for sealing rupture discs will range from 40 to 90 foot pounds, depending upon pressure and media being used.
Material of body and hold down nut is high tensile 316 stainless steel. Standard tubing glands and collars are provided unless otherwise specified.

FEATURES & BENEFITS
Safety head assemblies and rupture discs are available in two styles:

The 1/4A style features a 1/4" blow-out diameter, an angular seat and can be ordered in pressures from 900 to 60,000 PSI (6.2 to 414MPa).
The 1/2F style features a 1/2" blow-out diameter, a flat seat and can be ordered in pressures from 500 to 10,000 PSI (3.4 to 69MPa). This style also has a reversible hold-down ring which greatly reduces the possibility of premature disc failure associated with installation errors inherent in some designs.

Note: Rupture discs are not included and must be ordered as a separate item.

TYPICAL APPLICATIONS
Gas
Liquid
Fluid handling for the chemical/petrochemical, research, and oil and gas industries

TYPICAL MATERIALS
316 Stainless Steel
Other materials available on request

ORDERING SAFETY HEADS

Safety Head - 1/4" ANGLED DISC
Pressure	Input Connection	Output Connection	Safety Head Model	Rupture Discs (1/4"A)
15000Psi (103MPa)	1/8" NPT	3/8" NPTF	20SHNMANFC-A	A
	1/4" NPT	3/8" NPTF	20SHNMBNFC-A	A
	3/8" NPT	3/8" NPTF	20SHNMCNFC-A	A
	1/2" NPT	3/8" NPTF	20SHNMDNFC-A	A
10000 Psi (69MPa)	3/4" NPT	3/8" NPTF	20SHNMFNFC-A	A
10000 Psi (69MPa)	1" NPT	3/8" NPTF	20SHNMHNFC-A	A
20000 Psi(138MPa)	1/4" UNF	3/8" NPTF	20SHMM4NFC-A	A
	3/8" UNF	3/8" NPTF	20SHMM6NFC-A	A
	9/16" UNF	3/8" NPTF	20SHMM9NFC-A	A
	3/4" UNF	3/8" NPTF	20SHMM12NFC-A	A
	1" UNF	3/8" NPTF	20SHMM16NFC-A	A
60000 Psi(414MPa)	1/4" UNF	3/8" NPTF	60SHMM4NFC-A	A
	3/8" UNF	3/8" NPTF	60SHMM6NFC-A	A
	9/16" UNF	3/8" NPTF	60SHMM9NFC-A	A
Safety Head - 1/2" FLAT DISC
Pressure	Input Connection	Output Connection	Safety Head Model	Rupture Discs (1/2"F)
15000 PSI (103MPa)	1/8" NPT	3/8" NPTF	20SHNMANFC-F	F
	1/4" NPT	3/8" NPTF	20SHNMBNFC-F	F
	3/8" NPT	3/8" NPTF	20SHNMCNFC-F	F
	1/2" NPT	3/8" NPTF	20SHNMDNFC-F	F
10000 PSI (69MPa)	3/4" NPT	3/8" NPTF	20SHNMFNFC-F	F
10000 PSI (69MPa)	1" NPT	3/8" NPTF	20SHNMHNFC-F	F
20000 PSI (138MPa)	1/4" UNF	3/8" NPTF	20SHMM4NFC-F	F
	3/8" UNF	3/8" NPTF	20SHMM6NFC-F	F
	9/16" UNF	3/8" NPTF	20SHMM9NFC-F	F
	3/4" UNF	3/8" NPTF	20SHMM12NFC-F	F
	1" UNF	3/8" NPTF	20SHMM16NFC-F	F
60000 PSI (414MPa)	1/4" UNF	3/8" NPTF	60SHMM4NFC-F	F
	3/8" UNF	3/8" NPTF	60SHMM6NFC-F	F
	9/16" UNF	3/8" NPTF	60SHMM9NFC-F	F

High Pressure Rupture Discs

Rupture discs are available in a wide range of burst ratings. Factors such as corrosion, fatigue and temperature may affect the burst pressure of the disc and cause premature failure. This problem may sometimes be overcome by frequent replacement of the disc. All rupture discs rated over 500 PSI (3.4MPa) have a manufacturing tolerance of minus 3% under to plus 6% over the specified rupture pressure rating.

ORDERING RUPTURE DISCS

Style
A=1/4" Angled
F=1/2" Flat

Material
AL=Aluminum
IN=Inconel
MO=Monel
NI=Nickel
SI=Silver
SS=316SS
TI=Titanium

Pressure
List desired pressure at 72°F (21°C) in KSI.

1．Standard Burst Pressures (in Psi at 21°C)

1000 PSI	3000 PSI	5000 PSI	7000 PSI	9000 PSI	11000 PSI	17500 PSI	25000 PSI	37500 PSI	55000 PSI
1500 PSI	3500 PSI	5500 PSI	7500 PSI	9500 PSI	11500 PSI	18000 PSI	27000 PSI	40000 PSI	60000 PSI
2000 PSI	4000 PSI	6000 PSI	8000 PSI	10000 PSI	12500 PSI	20000 PSI	30000 PSI	45000 PSI	65000 PSI
2500 PSI	4500 PSI	6500 PSI	8500 PSI	10500 PSI	15000 PSI	22500 PSI	35000 PSI	50000 PSI

2．Standard Burst Pressures (in Mpa at 21°C)

7 Mpa	21 Mpa	34 Mpa	48 Mpa	62 Mpa	76 Mpa	121 Mpa	172 Mpa	259 Mpa	379 Mpa
10 Mpa	24 Mpa	38 Mpa	52 Mpa	66 Mpa	79 Mpa	124 Mpa	186 Mpa	276 Mpa	414 Mpa
14 Mpa	28 Mpa	41 Mpa	55 Mpa	69 Mpa	86 Mpa	138 Mpa	207 Mpa	310 Mpa	448 Mpa
17 Mpa	31 Mpa	45 Mpa	59 Mpa	72 Mpa	103 Mpa	155 Mpa	241 Mpa	345 Mpa

Examples:
An Inconel disc rated for 12,000 PSI in 1/4" Angled style would be ordered as RD12000-A-IN
An Aluminum disc rated for 750 PSI in 1/2" Flat style would be ordered as RD750-F-AL