CN211040465U

CN211040465U - Secondary shielding pressure control system of L NG transport ship

Info

Publication number: CN211040465U
Application number: CN201921907103.0U
Authority: CN
Inventors: 李科
Original assignee: China Merchants Heavy Industry Jiangsu Co Ltd
Current assignee: China Merchants Heavy Industry Jiangsu Co Ltd
Priority date: 2019-11-07
Filing date: 2019-11-07
Publication date: 2020-07-17
Anticipated expiration: 2029-11-07

Abstract

The utility model discloses a secondary shielding pressure control system of L NG transport vechicle, including L NG fluid reservoir, be equipped with the secondary shielding layer between L NG fluid reservoir and the hull, secondary shielding layer and L NG fluid reservoir leave the secondary shielding space, the secondary shielding space is equipped with the relief valve, be equipped with the relief valve discharge pipe between bypass valve and the relief valve, be equipped with the sample valve between bypass valve and the relief valve import pipe, secondary shielding space top is equipped with the nitrogen gas filling pipe, the nitrogen gas filling pipe is equipped with stop valve II, the nitrogen gas filling pipe is equipped with pressure control valve, pressure control valve both sides are equipped with the manometer, the pressure control valve upper reaches are equipped with stop valve I, pressure control valve low reaches are equipped with the sample valve, be equipped with pressure sensor in the secondary shielding space, the pressure sensor upper reaches are equipped with the isolation valve.

Description

Secondary shielding pressure control system of L NG transport ship

Technical Field

The utility model relates to a liquefied gas carrier builds technical field, specifically is a secondary shielding pressure control system of L NG transport vechicle.

Background

Part 2 of msc, 370(93) -IGC Code international bulk transport liquefied gas vessel construction and equipment rules 2014, chapter 8, the second article, specifies that the secondary shielded space needs to be provided with a pressure relief device, but there is no specific requirement for what manner; the first rule of chapter 9, chapter 2, of the rules, specifies a cargo containment system with a complete or partially complete secondary shielded space, which must be filled with dry inert gas if the vapor of the cargo contained therein is flammable, so as to guarantee the safety of the ship to the maximum extent once the cargo leaks.

At present, two sets of air supply devices and pressure release devices are respectively arranged for pressure control of a secondary shielding space in the industry, the arrangement is difficult, and the cost is increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model discloses a secondary shielding pressure control system of L NG transport ship.

The technical scheme of the utility model is that a secondary shielding pressure control system of L NG transport vechicle, including setting up the L NG fluid reservoir in the hull, be equipped with the secondary shielding layer between L NG fluid reservoir and the hull, leave the secondary shielding space between secondary shielding layer and the L NG fluid reservoir, secondary shielding space top is equipped with the relief valve, relief valve one end is through connecting pipe and secondary shielding space intercommunication, the other end of relief valve passes through safety inlet pipe and secondary shielding space intercommunication, the other side of relief valve is equipped with the bypass valve, bypass valve one end and relief valve import pipe link to each other, the other end links to between relief valve import pipe and relief valve, be equipped with the relief valve discharge pipe between bypass valve and the relief valve, be equipped with the sample valve between bypass valve and the relief valve import pipe, secondary shielding space passes through hose I and is equipped with the nitrogen gas injection pipe at the top, nitrogen gas injection pipe middle part is equipped with stop valve II, even have hose II on the stop valve II, be equipped with the pressure control valve between nitrogen gas injection pipe and the hose I, pressure control valve both sides are equipped with the manometer, pressure gauge outside the.

Further, a nitrogen injection pipe is fixed on the outer wall of the L NG liquid tank, and the nitrogen injection pipe extends from the top of the liquid tank to the bottom of the L NG liquid tank and extends from the head of the liquid tank to the tail of the L NG liquid tank.

Furthermore, the nitrogen injection pipe is divided into two paths, one path of the nitrogen injection pipe has a larger pipe diameter and is connected with the secondary shielding space through a hose II, the other path of the nitrogen injection pipe has a smaller pipe diameter and is connected with the secondary shielding space through a pressure control valve, and the two paths are converged and are finally connected with the secondary shielding space through a hose I.

The utility model discloses an useful part: the design is simple, the method is reliable, can real time monitoring secondary shield internal pressure, when internal pressure superpressure, can send the warning and open the relief valve automatically and release and prevent that the inner space from suffering destruction, when internal pressure was low excessively, also can supply nitrogen gas to inside automatically, improved the security of transport ship.

Drawings

Fig. 1 is a schematic structural view of the present invention;

the device comprises a secondary shielding layer 1, a secondary shielding space 2, an isolation valve 3, a pressure sensor 4, a pressure guide pipe 5, a safety valve 6, a safety valve inlet pipe 7, a safety valve outlet pipe 8, a sampling valve 9, a bypass valve 10, a pressure gauge 11, a stop valve I12, a pressure control valve 13, a hose II14, a sampling valve 15, a stop valve II16, a nitrogen injection pipe 17, a hose I18 and a hose I19, L NG liquid tank.

Detailed Description

In order to deepen the understanding of the present invention, the following detailed description is given with reference to the accompanying drawings, which are only used for explaining the present invention and do not constitute a limitation to the protection scope of the present invention.

As shown in figure 1, the secondary shielding pressure control system of an L NG transport ship comprises a L NG liquid tank 19 arranged in a ship body, a secondary shielding layer 1 is arranged between the L NG liquid tank 19 and the ship body, and a secondary shielding space 2 is reserved between the secondary shielding layer 1 and the L NG liquid tank;

a safety valve 6 is arranged at the top of the secondary shielding space 2, one end of the safety valve 6 is communicated with the secondary shielding space 2 through a pressure guide pipe 5, the other end of the safety valve 6 is communicated with the secondary shielding space 1 through a safety inlet pipe 7, a bypass valve 10 is arranged beside the safety valve 6, one end of the bypass valve 10 is connected with the safety valve inlet pipe 7, the other end of the bypass valve 10 is connected between the safety valve inlet pipe 7 and the safety valve 6, a safety valve outlet pipe 8 is arranged between the bypass valve 10 and the safety valve 6, and a sampling valve 7 is;

the secondary shielding space 2 is provided with a nitrogen injection pipe 17 at the top through a hose I18, the middle part of the nitrogen injection pipe 17 is provided with a stop valve II16, a hose II is connected to the stop valve II16, a pressure control valve 12 is arranged between the nitrogen injection pipe 17 and the hose I18, pressure gauges 11 are arranged on two sides of the pressure control valve 12, a stop valve I is arranged outside a pressure gauge on the upstream side of the pressure control valve 12, a sampling valve 15 is arranged outside a pressure gauge on the downstream side of the pressure control valve 13, the nitrogen injection pipe 17 is divided into two paths, one path of the nitrogen injection pipe is large in diameter and is connected with the secondary shielding space 2 through a hose II14, the other path of the nitrogen injection pipe is small in diameter and is connected with the secondary shielding space 2 through a pressure control valve 13, the two paths are finally connected with the secondary shielding space through a hose I18 after being converged, the nitrogen injection pipe 17 is fixed on the outer wall of a L NG 19, and the;

the secondary shielding space 2 is provided with a pressure sensor 4, and the upper stream of the pressure sensor 4 is provided with an isolation valve 3.

The relief valve import pipe can pass through the relief valve discharge pipe with secondary shielding space internal pressure and discharge, and the connecting pipe can control the relief valve according to secondary shielding internal pressure and open, and pressure control valve can be according to the automatic inside supplementary nitrogen gas of secondary shielding internal pressure, and pressure sensor can transmit secondary shielding internal pressure to the control room and show.

Claims

1. A secondary shielding pressure control system of an L NG transport ship comprises a L NG liquid tank arranged in a ship body, a secondary shielding layer is arranged between a L NG liquid tank and the ship body, and a secondary shielding space is reserved between the secondary shielding layer and the L NG liquid tank.

2. The secondary shielding pressure control system for L NG carrier as claimed in claim 1, wherein the nitrogen injection pipe is fixed to the outer wall of L NG tank and extends from the top of the tank to the bottom of L NG tank and from the head of the tank to the tail of L NG tank.

3. The secondary shielding pressure control system of L NG carrier as claimed in claim 1, wherein the nitrogen injection pipe is divided into two paths, one path has a larger diameter and is connected to the secondary shielding space through a hose II, the other path has a smaller diameter and is connected to the secondary shielding space through a pressure control valve, and the two paths are merged and finally connected to the secondary shielding space through a hose I.