VAC-SAF™Rupture Disks

The VAC-SAF^TM System rupture disks offer two-way relief to provide maximum protection of gas or liquid storage vessels and plant from damage caused by excessive vacuum or over pressure.

We offer two modes of protection. When excessive vacuum is created during liquid withdrawal, accidental product loss, or during routine steam cleaning (e.g. for sterilization) the vessel and the plant is protected. Secondly, protection is provided by the same disk to relieve positive overpressure. The unique advantage of the VAC-SAF^TM System is that it reacts to an abnormal condition immediately, giving a full relief area instantaneously

The VAC-SAF^TM System can also offer relief of light overpressure.

The VAC-SAF^TM System rupture disks can be utilized in various ways:
Type DKB
For vacuum and over pressure relief in a KB-7R Safety Head, for installation between standard pipe flanges.
Type VKB
For vacuum and over pressure relief in a KB-C Safety Head with- hygienic fittings.
Type P/DKB
For light over pressure relief in a PKB-7R Safety Head, for installation between standard pipe flanges.
Type P/VKB
For light over pressure relief in a PKB-C Safety Head with hygienic fittings.

The VKB rupture disk (bursting disc) with the KB-C Safety Head meets the requirements of the American 3A Sanitary Standards. The KB-C Safety Head and VKB disk provide a uniformly smooth, noncontaminating and non-corrosive environment towards the products. The assembly is ideal for situations where frequent situation dismantling is required for product changes and cleaning purposes.

Applications for Protection

• Storage Tanks
• Silos
• Pi- Fermentation Systems
• Glycol re-boilers

USED IN PROCESSES

• Aseptic
• Food
• Dairy
• Beverage
• Pharmaceutical
• Applications where contamination in unacceptable.

The VAC-SAF Disk Components

VAC-SAF ^TM Rupture disks consist of three main parts:

A perforated and slotted metal section.

A Fluropolymer seal with integral Fluropolymer button.

A Fluropolymer slit cover between the Fluropolymer seal and the metal section prevents damage to the seal by the slits in the metal section.

Rupture Disk (Bursting Disc) Types DKB & VKB

Features

• Unique two-way acting disks prevent vessel damage from implosion under vacuum or over pressure
• Available in sizes 50 mm to 200 mm
• No-Vacuum relief pressures available from 110 mbar down to 10mbar
• Not for gas or liquid applications
• Disk offers smooth surface towards the process which prevents product accumulation and facilitates cleaning of the disk
• Asymmetric alignment pins in the Safety Head mate with locating holes in the rupture disk (bursting disc) for proper alignment and installation
• The standard material of the disks metal section is 316 SS. Consult BS&B regarding other materials, e.g. lnconel 600, Monel 400, Nickel 200 and Hastelloy C-276. The disk's seal material is fluoropolymer.

Vacuum Relief

At the rated Vacuum relief pressure the disk's seal separates from the perforated metal section to snap against knife blades located in the safety Head inlet , cutting the seal into three segments. The perforated metal sections remains intact and flow through the holes in the metal sections relieves the Vacuum condition.

Overpressure Relief

The disk relieves over pressure by opening fully along the radial slits in the perforated metal section.

Pressure Range for Vacuum and over Pressure  overpressure relief for Disk Types DKB and VKB at 72 'F
Disk Size (in)	Vacuum Relief					Overpressure Relief
	Minimum		Maximum		Vacuum Relief Area(sq.in)	Minimum		Maximum
	Wc	Bar	wc	Bar		PSI	Bar	PSI	Bar
2	7.5	0.019	44	0.110	1.50	18	1.240	170	11.720
3	6.5	0.016	30	0.075	3.57	16	1.100	170	11.720
4	5.5	0.014	30	0.075	5.93	13	0.900	119	8.210
6	5.5	0.014	30	0.075	12.30	13	0.900	90	6.210
8	5.5	0.014	20	0.050	18.50	7	0.480	55	3.790

Rupture Disk Types DKB & VKB

VKB Rupture disk and KB-C Safety Head with quick release hygienic fittings provides easy dismantling for routine maintenance. The 0-ring seal provides leak-tight connection.

Vacuum Relief

Burst Range
The Disks are available with a Burst Range of +/- 3.75 mbar for pressure up to 20 mbar and +/- 20% for higher pressures. All tolerances are included in the Burst Range.

Markings
A disk with vacuum relief pressure of 18 mbar will be shown on the disk tag as min 14.25 mbar to max 21.75 mbar

Operating Pressure
The system may operate up to 80% of the minimum of the marked Burst Pressure without affecting the service life of the disk.

Overpressure Relief

Manufacturing Range

The disks are available with a +/- 0.138 bar or 10% manufacturing range depending on the burst pressure.

Tagged Burst Manufacturing

Pressure	Range
up to 2.76bar	+/-0.138bar
above 2.76 bar	-10%

Example:
A burst pressure of 4 bar is requested with a 10% manufacturing range. The values of the burst tests carried out during manufacture will be between 3.6 bar and 4 bar. The average of these test values will be marked on the disk tag.

Burst Tolerance
Tolerances are the maximum variation from the burst pressure shown on the disk tag.

Tagged Burst Pressure (bar)	Burst Tolerances
0.41 -0.55	+/- 20%
0.62 -0.83	+/- 15%
0.90-1.17	+/- 10%
1.24-1.72	+/- 7%
1.79 and above	+/- 5%

Operating Temperature Range
Minimum -40'C to Maximum 80'C.

Rupture Disk Types P/DKB & P/ VKB

Highlights

• Unique two-way acting disks prevent vessel damage from light over pressure or implosion under vacuum
• Available in sizes 50mm to 200mm
• Rupture pressures available from 110 mbar down to 10 mbar
• Asymmetric alignment pins in the Safety Head mate with locating holes in the rupture disk (bursting disc) for proper alignment and installation.
• The standard material of the disks metal section is 316SS. Consult BS&B regarding other materials, e.g. lnconel 600, Monel 400, Nickel 200 and Hastelloy C-276. The disk's seal material is fluropolymer.
• For gas or liquid applications

PRESSURE RANGE FOR LIGHT OVERPRESSURE AND VACUUM RELIEF FOR DISK TYPE P/VKB AT 22 C
OVER PRESSURE RELIEF (MBARS)
DISK SIZE	MINIMUM	MAXIMUM	RELIEF AREA (SQ.MM)
2" 50 mm	18.75	110	967
3" 80mm	16.25	75	2303
4" 100mm	13.75	75	3825
6" 150mm	13.37	75	7935
8" 200mm	13.75	50	11936

How the System Works

Overpressure relief

At the rated burst pressure the disk's seal separates from the perforated metal section to snap against knife blades, located in the Safety Head outlet, cutting the seal into three segments. The perforated metal section remains intact and flow through the holes in the metal section relieves the over pressure.

Overpressure Relief

Burst Range: + /- 3.75 mbar for pressure up to 20 mbar and +/- 20% for higher pressures. All tolerances are included in the Burst Range.
Markings
A disk with a marked burst pressure of 40 mbar will be shown on the ,disk tag as Min. 32 mbar Max. 48 mbar
Operating Pressure
The system may operate up to 80% of the minimum of the Burst Range without affecting the service life of the disk.
Operating Temperature Range
Minimum -40^oC to Maximum 80^oC
Vacuum Relief
The disk may be used also to relieve vacuum depending on specific requirements.

Safety Head Insert Types KB-7R & PKB-7R

• Quik-Sert reduces diameter safety head fits inside the studs of two companion flanges
• Asymmetric alignment pins in the Safety Head mate with locating holes in the rupture disk (bursting disc) for proper
  alignment and installation
• The inlet and outlet of the Safety Heads is held together by side lugs
• Standard materials are 304 SS and carbon steel. Consult BS&B Safety Systems for other materials
• Knife blade material is 301 SS

The dome of the disk is protected by the Safety Head.

SAFETY HEAD SPECIFICATION
RUPTURE DISK  NOMINAL	PN 10		ANSI 150
	A OUTSIDE DIAMETER	B OVERHEIGHT	A OUTSIDE DIAMETER	B OVER HEIGHT
2" 50mm	107mm	46.5mm	102.0mm	46.5mm
3" 80mm	142mm	47.5mm	133.0mm	47.5mm
4" 100mm	162mm	59.0mm	171.0mm	59.0mm
6" 150mm	218mm	66.0mm	219.0mm	66.0mm
8" 200mm	273mm	71.5mm	276.0mm	71.5mm

Safety Head Hygenic Types KB-C & PKB-C

• Hygienic fittings permit quick installation or dismantling
• Ring seal provides leak tight connection
• Asymmetric alignment pins in the Safety Head mate with locating holes in the rupture disk (bursting disc) for proper alignment and installation
• The knife blade material is 301 SS
• Safety Head material 300 series stainless steel

SAFETY HEAD SPECIFICATION
RUPTURE DISK NOMINAL	A OUTSIDE DIAMETER	B OVER ALL HEIGHT	HYGIENIC FITTING SIZE
2" 50mm	90.4mm	76.2mm	3" 76.2mm
3" 80mm	118.8mm	76.2mm	4" 101.6mm
4" 100mm	166.6mm	101.6mm	6" 152.4mm
6" 150mm	217.4mm	101.6mm	8" 203.2mm
8" 200mm	268.2mm	114.3mm	10" 254.0mm