Emergency release system for liquefied hydrogen
An emergency release system includes a first shut-off valve unit which is land-based; and a second shut-off valve unit which is provided for a marine vessel and separably connected to the first shut-off valve unit, and the first shut-off valve unit is provided with a reservoir container which receives liquid air generated in the first shut-off valve unit and dropped, in a state in which the second shut-off valve unit is separated from the first shut-off valve unit, and the system includes a container support mechanism which is capable of retaining the reservoir container at a retracted position in a state in which the first and second shut-off valve units are connected to each other, the container support mechanism being configured to automatically shift the reservoir container to a reserving position, in a state in which the first and second shut-off valve units are separated from each other.
1. An emergency release system equipped in a loading arm for liquefied hydrogen, the emergency release system comprising:
a first shut-off valve unit;
a second shut-off valve unit which is separably connected to the first shut-off valve unit;
a reservoir container; and
a container support arm which is configured to (i) retain the reservoir container at a retracted position at which the reservoir container is not on a flow axis of the first shut-off valve in a state in which the first and second shut-off valve units are connected to each other with a flow axis of the second shut-off valve being aligned with the flow axis of the first shut-off valve in a gravity direction, and (ii) automatically shift the reservoir container to a reserving position that is on the flow axis of the first shut-off valve unit in the gravity direction in a state in which the first and second shut-off valve units are separated from each other, such that the reservoir container receives liquid air dropped from the first shut-off valve unit.
2. The emergency release system for liquefied hydrogen, according to claim 1 ,
wherein the reservoir container is retained in a horizontal posture at the reserving position,
wherein the reservoir container is retained in a vertical posture at the retracted position, and
wherein the container support arm includes:
a pair of link members, first end portions of which are secured to both side portions, respectively, of the reservoir container, and second end portions of which are hingedly coupled to both side portions, respectively, of the first shut-off valve unit, the pair of link members extending from the reservoir container to the first shut-off valve unit, and
a stay member which is secured to the second shut-off valve unit and configured to receive and hold the reservoir container at the retracted position from below.
3. The emergency release system for liquefied hydrogen, according to claim 1 ,
wherein the reservoir container is retained in a horizontal posture at the reserving position,
wherein the reservoir container is retained in a vertical posture at the retracted position, and
wherein the container support arm includes:
an L-shaped member, a first end portion of which is secured to a side portion of the reservoir container,
a pair of brackets attached on side portions of the first shut-off valve unit,
a coupling pin coupling a second end portion of the L-shaped member to tip end portions of the brackets,
a spring member which is externally mounted on the coupling pin and configured to bias the reservoir container toward the reserving position,
a stay member which is secured to the second shut-off valve unit and configured to receive and hold the reservoir container at the retracted position from below, and
a stopper which is secured to the first shut-off valve unit and configured to receive and hold the L-shaped member and retain the reservoir container at the reserving position, in a state in which the first and second shut-off valve units are separated from each other.
4. The emergency release system for liquefied hydrogen, according to claim 1 ,
wherein the reservoir container is provided with a plurality of fins protruding from an outer surface of the reservoir container in such a manner that the plurality of fins are integrated with the reservoir container.
5. The emergency release system for liquefied hydrogen, according to claim 1 ,
wherein an electric heater is attached on a valve shaft of a shut-off valve of the first shut-off valve unit.
6. The emergency release system for liquefied hydrogen, according to claim 2 ,
wherein the reservoir container is provided with a plurality of fins protruding from an outer surface of the reservoir container in such a manner that the plurality of fins are integrated with the reservoir container.
7. The emergency release system for liquefied hydrogen, according to claim 3 ,
wherein the reservoir container is provided with a plurality of fins protruding from an outer surface of the reservoir container in such a manner that the plurality of fins are integrated with the reservoir container.
8. The emergency release system for liquefied hydrogen, according to claim 2 ,
wherein an electric heater is attached on a valve shaft of a shut-off valve of the first shut-off valve unit.
9. The emergency release system for liquefied hydrogen, according to claim 3 ,
wherein an electric heater is attached on a valve shaft of a shut-off valve of the first shut-off valve unit.