abcmex is correct, being minus 14.7 PSI is a full vacuum. Crispin Valve has done this in the past. It is done using a vacuum relief valve with a spring sized specific for the negative pressure. Hope this helps.
I have to agree with BRIS, the filling of pipelines should always be done slowly & controlled. However, this isn't always the case for whatever reasons.
One other site to check out is Crispin Valve. They have quite a bit of technical information I find useful.
