Hi kacarrol,
I work for another Rupture Disc manufacturer (Fike Corp) and am very familiar with all the applicable codes and standards however MP-5104 is not one I have seen. It is most likely an internal procedure from that manufacturer on how to manufacture the disc and holder.
Hope that...
Hi Laurent,
I am not aware of any bi-directional discs on the market that are ASME certified. Additionally, I don't think there are any sanitary rupture discs that go down to 3 psig that are also ASME certified. I really do think your only option here is to use an ASME certified vacuum breaker...