# US 2018/0023766 A1 · Valve system for an lng tank

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- Number: US 2018/0023766 A1
- Document ID: US20180023766A1
- Status: Published application
- Kind: A1
- Application number: 15/548,013
- Filed: 2015-02-24
- Published: 2018-01-25
- Earliest claimed: 2015-02-24
- Assignees: WäRtsilä Finland Oy
- Applicants: Wartsila Finland Oy
- Inventors: Henrik SUNDQVIST; Mathias JANSSON; Soren KARLSSON
- Web page: https://patentgrep.com/patent/US20180023766A1

## CPC

- F17C 13/04: Arrangement or mounting of valves (valves per se F16K {; snap-coupling of nipples F16L37/00})
- F17C 13/12: Arrangements or mounting of devices for preventing or minimising the effect of explosion (flame traps A62C4/00 ){; Other safety measures}
- F17C 2201/0114: with interiorly curved end-piece
- F17C 2201/035: with substantially horizontal main axis
- F17C 2201/052: large (>1000 m3)
- F17C 2203/03: Thermal insulations
- F17C 2205/0332: Safety valves or pressure relief valves
- F17C 2205/0355: Insulation thereof
- F17C 2205/0397: on both sides of the pressure vessel
- F17C 2221/033: Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
- F17C 2223/0161: cryogenic, e.g. LNG, GNL, PLNG
- F17C 2223/033: Small pressure, e.g. for liquefied gas
- F17C 2260/042: Reducing risk of explosion
- F17C 2270/0105: Ships
- F17C: VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES (storing fluids in natural or artificial cavities or chambers in the earth B65G5/00; construction or assembling of bulk storage containers employing civil-engineering techniques E04H7/00; variable-capacity gas-holders F17B; liquefaction or refrigeration machines, plants, or systems F25)

## Abstract

The invention relates to a valve system of a fuel tank, especially of an LNG tank, which valve system includes at least two pressure relief safety valves, in which valve system one pressure relief safety valve is located in one safety valve branch branching from an outlet line from the LNG tank. The valve system further comprises interconnected shutoff valves for shutting off one of the safety valve branches at time and that the shutoff valves are diverter valves with a T-bore.

## Claims

### Claim 1

A valve system for an LNG fuel tank, which valve system comprises two pressure relief safety valves, in which an outlet line from the LNG fuel tank is divided into two safety valve branches each comprising one pressure relief safety valve, wherein the valve system further comprises interconnected shutoff valves for shutting off one of the safety valve branches at time so that at least one pressure relief safety valve is in operation at all times, that the safety valve branches connect to a common outlet line and one of the shutoff valves is located at the branching point of the outlet line for the LNG fuel tank and one of the shutoff valves is located at the connecting point to the common outlet line and that the shutoff valves are diverter valves with a T-bore.

### Claim 2 (depends on 1)

The valve system according to claim 1, wherein the shutoff valves are interconnected by a mechanical connector.

### Claim 3 (depends on 1)

The valve system according to claim 1, wherein the interconnected shutoff valves are interlocked with a mechanical key and lock system with free keys and trapped keys.

### Claim 4 (depends on 1)

The valve system according to claim 1, wherein the shutoff valves for the pressure relief safety valves for the LNG fuel tank are diverter valves with T-bore and the shutoff valves are interlocked mechanically such that when one shutoff valve is turned to a position, for example to close one safety valve branch and keep the other safety valve branch open, the other shut off valve will turn at the same time to corresponding position, i.e. closing the same safety valve branch and keeping the other safety valve branch open.

### Claim 5 (depends on 1)

The valve system according to claim 1, wherein the valve system is located in a tank connection space of a marine vessel.

### Claim 6 (depends on 1)

A marine vessel comprising a valve system according to claim 1.

### Claim 7

(canceled)