SVI

A new one piece disposable rupture disk (bursting disc) assembly for isolating safety-relief valves.
For retrofit with fixed piping.

Features

1. Solid reverse buckling S-90 Disk welded into a flange assembly.
2. Petals open up along scored (pre-weakened) lines.
3. Petals open up to give full flow.
4. Available in sizes 1 1/2 ” thru 6″ including 2 1/2″.
5. Fluoropolymer Boot available upon request for process side of SVI.
6. Designed specifically to isolate relief valves from the process media and keep the process fluid from leaking to the atmosphere.
7. The SVI fits between ANSI flanges.
8. A pair of gaskets supplied with each SVI assembly
9. Standard disk materials will be Nickel and Inconel. The body and flange will be 316 Stainless Steel. Consult BS&B for other Disk Materials.

Benefits

1. No piping changes are required for retrofit of existing relief valve systems.
2. No knife blades to maintain.

Selection Data

Engineering Information

Minimum and maximum pressure ratings are applicable at 72° F.

SVI Flanges are 316 stainless steel or Inconel.

Manufacturing Range:

1. Inconel and nickel rupture disks (bursting discs) are available with 5% and 10% manufacturing range.
2. On these 5% and 10% manufacturing ranges, the total range is placed on the minus side of the requested pressure rating.

Example:

If a 200 psig SVI is ordered with a 10% manufacturing range, it may be tagged at any pressure between 200 psig and 180 psig.

Burst Tolerances:

Burst tolerances are the maximum variation from the above tagged burst pressure.
Disks tagged above 40 psig. Burst Tolerance ± 5%.
Disks tagged 40 psig and below: ± 2 psi.
Recommended maximum temperatures for each metal are:
Inconel: 900° F.
Nickel: 750° F.

How to Select

STEP 1: Select the proper SVI to fit your nominal pipe ID in the chart above.
NOTE: Fits schedule 80 and lighter piping.
STEP 2: Check proper material for your application pressures and temperatures required:
STEP 3: To Order Specify:

• Quantity
• Temperature
• Burst Pressure
• Fluoropolymer
• Boot (optional)
• Size
• Disk
• Material

NOTE: Products, specifications, and all data in this literature are subject to change without notice. Questions regarding product selection and specifications for specific applications should be directed to BS&B, Attn: Customer Service Department.