BS EN 13648-3:2002 Cryogenic vessels. Safety devices for protection against excessive pressure. Determination of required discharge. Capacity and sizing
This standard provides a separate calculation method for determining the contributing mass flow to be relieved
resulting from each of the following specified conditions:
_ vacuum insulated vessels with insulation system (outer jacket + insulating material) intact under normal
vacuum. Outer jacket at ambient temperature. Inner vessel at temperature of the contents at the relieving
pressure;
_ vacuum insulated vessels with insulation system remaining in place but with loss of vacuum, or non vacuum
insulated vessels with insulation system intact. Outer jacket at ambient temperature. Inner vessel at
temperature of the contents at the relieving pressure;
_ vacuum or non vacuum insulated vessels with insulation system remaining fully or partially in place, but with
loss of vacuum in the case of vacuum insulated vessels, and fire engulfment. Inner vessel at temperature of
the contents at the relieving pressure;
_ vessels with insulation system totally lost and fire engulfment.
Good engineering practice based on well established theoretical physical science shall be adopted to determine
the contributing mass flow where an appropriate calculation method is not provided for an applicable condition.
BS EN 13648-3:2002 history
2016BS EN ISO 21013-3:2016 Cryogenic vessels. Pressure-relief accessories for cryogenic service. Sizing and capacity determination
2002BS EN 13648-3:2002 Cryogenic vessels. Safety devices for protection against excessive pressure. Determination of required discharge. Capacity and sizing