Rupture disc price

In most cases the material and the design type carry the most weight. A flat 316 stainless steel disc for a standard application is the most straightforward option. Hastelloy, titanium or a reverse acting design add material and manufacturing effort. Diameter and burst pressure follow closely, because they determine thickness and construction. A holder, extra documentation and burst detection add further items to the quotation. Quantity influences how fixed efforts such as batch testing are spread. Which factor dominates differs from one application to the next. When you ask, we explain which choices drive the cost in your case.

That depends on the medium and on the alternative you compare it with. Against a standard 316 stainless steel disc in mild service, graphite is not automatically the cheaper option. Against a disc in an exotic alloy for aggressive chemistry, graphite can be economically attractive. Graphite resists many acids, bases and aggressive media without a coating. Many graphite discs can be mounted directly between standard flanges without a separate holder. That can simplify the installation and reduce the scope of the order. Options such as TFE coating, burst detection or vacuum support add to the specification. We compare both routes for your medium so you can decide on facts.

A holder adds a component to the first order, so the initial scope is larger. In return you get correct positioning, reproducible clamping and a proper seal. A poorly designed or missing holder can lead to premature failure, leakage or a wrong burst pressure in demanding services. Holders are designed for long-term reuse, so only the disc is replaced after an event. For pulsating pressure or cyclic loading we almost always advise a holder. In systems with straight pipe sections and steady conditions, direct flange mounting can be suitable. The comparison should therefore cover the whole life of the installation, not just the first purchase. We tell you honestly when a holder adds value and when it does not.

Burst pressure determines how the disc is constructed. Very low burst pressures require very thin or specially built membranes, which are technically demanding. High pressures call for sturdier designs such as forward acting or multi-layer metal discs. The required tolerance matters too, because a tighter tolerance means more manufacturing and verification effort. Temperature at the moment of bursting is part of the same equation. A hotter disc can open at a lower pressure than a cold one, to an extent that depends on material and design. A disc must be designed and verified for the scenario it protects against. Give us the burst pressure, the tolerance you need and both temperatures so we can quote precisely.

Ordering several identical discs together usually spreads fixed efforts over more pieces. Burst pressure is verified by destructive testing of discs from the same batch. Preparing production for a specific design also takes effort regardless of the batch size. Bundling replacements for identical positions is therefore often sensible. Adding spare discs for critical positions to the same order is another smart move. A rupture disc is single use, so a spare on the shelf shortens downtime after an event. Spare discs should be stored and handled carefully, because a damaged disc must never be installed. Tell us how many positions share the same specification and we will take that into account.

Burst detection adds a sensor, cabling and the connection to your control system. Detection can work with an electrical loop that breaks or a magnetic field that changes when the disc opens. Fail-safe designs also report a defect in the sensor itself. In explosive atmospheres the sensor needs suitable ATEX certification. The signal can go to a PLC, SCADA or DCS to stop the process and warn personnel. For toxic, valuable or environmentally harmful media, that speed of response is often decisive. Detection can be integrated into the disc or the holder, and it is also available as an option on our graphite discs. We advise where detection adds value, so you do not specify it where it is not needed.

Standard documentation for our holders includes material certificates to EN 10204 3.1. Pressure calculations, inspection reports and traceability per component are part of that package. Some projects need more, such as a PED dossier for the holder. FEM analyses are available on request for demanding applications. Support in HAZOP and other safety studies is another engineering service we can provide. Each of these involves engineering time, so it belongs in the quotation. Mention your documentation requirements at the enquiry stage to avoid surprises later. That way the quotation you receive matches what your quality department will ask for.

The most effective step is sending complete data from the start. Start with the medium and its composition, then the operating pressure including peaks and the required burst pressure. Add the temperature in normal operation and in the relief scenario. The connection, nominal diameter, flange standard and installation space complete the technical picture. Mention the number of positions, the required documents and whether burst detection or a holder is wanted. For replacements, the existing tag data and specification are often enough. If a value is unknown, say so, and we will help you determine it. Send everything to sales@dutchvalvevision.com and we will get back to you as soon as possible.