CGA PS-4提供了CGA关于在用低温和冷冻液体的固定式真空夹套储罐是否应接受高于最大允许工作压力（MAWP）的定期验证试验的立场。

CGA PS-4 provides CGA's position on whether stationary, vacuum-jacketed storage tanks for cryogenic and refrigerated liquids in service should be subjected to periodic proof tests above the maximum allowable working pressure (MAWP).