API 520 Part I is a standard written and published by the American Oil Institute. It is the preferred standard for selecting pressure relief devices in petrochemical applications. For tear discs, this typically highlights the various kinds of tools, how to correctly select them, and the sizing estimation made use of for option.
There are several process and device criteria to consider when selecting rupture discs for an application. It is critical to define them precisely because they all affect how a rupture discs performs during an alleviation event.
Refine specifications include:
- Maximum Allowable Working Pressure (MAWP) of the vessel
- Fluid state
- Operating pressures as well as temperatures
- Regularity as well as the magnitude of pressure fluctuations
- Required alleviation ability
- Process liquid corrosiveness
- The vacuum cleaner as well as back pressure conditions
- Upstream, downstream and also parallel tools, consisting of PRDs
Rupture disc specifications include:
- Ruptured pressure and also temperature
- Operating ratio
- Production layout range
- Burst tolerance
- Disc type
- Products of building and construction
- Disc/holder line size and also course
Product Design Scope
The selection of the manufacturing design range for the rupture disc is one of the much more complicated subjects for designers. This is frequently confused with burst resistance, which is a very different top quality. The partnership Oseco – Elfab makes use of the resources and experience of two well-known pressure relief companies.
The manufacturing design range (also known as the manufacturing array) specifies the maximum and minimum pressure limits within which a rupture disc’s burst stress can be measured. The most common arrays are 0%, 5%, and 10%, but various other common arrays exist for various rupture disc designs. The ruptured stress will be marked at the average of the examination breaks for a large amount of rupture disc, which must exist between +0% and -5% of the requested ruptured pressure. The 10% array is similar to the 5% array, but it allows test breaks to fall between +0% and -10%. A 0% range allows the ruptured stress to be recorded only at the requested ruptured pressure. When reordering or upgrading rupture disc tools, a 0% array is preferred to avoid confusion.