CRYOGENIC TANK MANHOLE HATCH Russian patent published in 2021 - IPC F17C13/00 

FIELD: technological processes.

SUBSTANCE: invention relates to cryogenic equipment and can be used both in transport and stationary cryogenic tanks, vessels and reservoirs. Cryogenic reservoir hatch hat comprises a flange separated by a vacuum cavity, a plug and a sealing gasket of the shell, as well as a flange and a plug of the vessel. Plug of the vessel is made on the outer side of the flange with two sealing gaskets, the cavity between which is communicated with the atmosphere via a check valve. Clamp ring with lower and upper collars and radial sealing ring is installed in flange of shell. On upper collar of hold-down ring through gasket cover is fixed, and vessel cover with sealing gaskets is installed on vessel flange on inner side. On the flange of the shell and the flange of the vessel there are sealing gaskets located opposite the lower collar of the hold-down ring.

EFFECT: invention allows improving reliability of the manhole and maintaining vacuum in the heat-insulating cavity of the cryogenic reservoir both during normal operation and during preventive inspections of the inner surface of the vessel.

1 cl, 2 dwg