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No, I don't think so. But I have issues with installation if using 1" piping in discharge line. The relief valve outlet is 1".

However, sizing of the PSV discharge line has a direct impact on the proper operation of the PSV, which then falls under Sec. VIII.

thanks Joe. Our calculation shows no choke flow even with the smaller discharge line. If I choose to use a discharge line that is smaller in size than the relief valve outlet, calculations may be needed to demonstrate that the backpressure generated does not adversely affect the operation of...

ASME Sec. VIII UG-135(f) does not disallow a smaller discharge line size than the relief valve outlet, and only states that "the size of the discharge lines shall be such that any pressure that may exist or develop will not reduce the relieving capacity of the pressure relief devices below that...