We have large deaerators in our generating station that have a rupture disc on them (approx 10").  Ocassionally one will blow up a pipe through the roof.  It goes off like a jet engine and there is lots of steam.  Problem is, this scares the nearby residents and there are always phone calls. The design is about 40 years old. code allow mufflers to be installed to quiet down the release and a way to reduce the steam going to atmosphere? a silencer installation in accordance to ASME B31.1 Open System may solve the problem. Instead of safety valve you will have a rupture disc and a short pipe for the open system connection. This pipe will be inserted into the discharge pipe and silencer connected to this pipe. Just before the rupture disk failure, the back of the rupture disk will be at/around atmospheric pressure. There will not be any back pressure at the rupture. After the rupture, there will be some kind of pressure losses in the system of course due to silencer and pipe friction back pressure. Silencer back pressure ( I suggest 15 KPa  or under ) may be reduced by the silencer manufacturer by compramising the size of it. This back pressure should be a lot less than the deaerator pressure.
However, a design engineer's and a silencer manufacturer's involvments are essential. They may require the whole process information, pressures, temperatures, flow rates etc... Silencer and the exhaust pipe have to be supported independantly to take ultimate pressure forces due to losses in the system.

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