JP3056652U - Tank protectors for solidifying liquid carriers - Google Patents

Abstract

(57) [Summary] [Problem] A condensation state of cargo vapor occurs around a flame arrester, and sulfur or asphalt pitch is generated in the flame arrester, which may cause clogging of a wire mesh of the flame arrester itself. SOLUTION: Heated liquid such as molten sulfur or asphalt is loaded and unloaded into a cargo tank by a cargo line, and a part of piping of an intake cylinder is provided in a cargo tank in which a flame arrestor is provided at a tip of a ventilation cylinder. Utilizing, a tank protection device is provided in parallel with the valve, and the tank protection device is sandwiched between two flanges by a disc guide on the positive pressure side and a disc guide on the negative pressure side around the perforated board,
The perforator is torn by a certain overpressure, and the cargo tank is opened to the atmosphere.

Description

[Detailed description of the invention]

[0010]

[Industrial applications]

 The present invention relates to a protection device for a cargo tank for loading a heated liquid of a solidifying liquid carrier such as molten sulfur or asphalt which solidifies at room temperature.

[0020]

[Prior art]

 As shown in FIG. 2, a conventional heating technique, in which a heated liquid 31 such as molten sulfur or asphalt heated to about 125 ° C. to about 200 ° C. is loaded and unloaded into a cargo tank 32 by a cargo line 33. Was.

The cargo tank 32 is provided with a heat shield 36 having a certain thickness around the cargo tank 32 in order to avoid heat radiation of the heating liquid 31, and a heating pipe 37 is laid at the bottom of the cargo tank 32, There were 31 warmths and heatings.

When the heating liquid 31 is loaded and unloaded, the gas layer space 34 of the cargo tank 32 discharges the cargo vapor from the tip of the ventilation tube 35 or sucks the atmosphere. Further, a wire mesh, a so-called frame arrestor 40, is provided at the tip of the ventilation tube 35 to prevent fire.

When the heating liquid 31 in the cargo tank 32 is unloaded and the cargo tank 32 is emptied, the vapor space 34 is filled with the vapor of the heating liquid 31, for example, hydrogen sulfide. The valve 38 provided on the tank 32 is opened, the ventilation fan 39 is operated, the air is forcibly sent into the gas layer space 34, and the cargo vapor is discharged from the ventilation tube 35.

[0060]

[Problems to be solved by the invention]

 As described in the background art, a cargo tank is loaded with a heating liquid at a temperature of a hundred and several tens of degrees Celsius, and the gas space also becomes cargo vapor at a similar temperature. Before the cargo vapor is discharged from the flame arrester, the cargo vapor is at a temperature of a few hundred degrees Celsius, and the atmosphere is at most about 15 to 35 degrees Celsius. At the time of discharge, there is still a difference of one hundred and several tens of degrees Celsius.Condensation of cargo vapor occurs around the flame arrester, and the flame arrester generates sulfur or asphalt pitch and clogs the wire mesh of the flame arrester itself. Wake up. At the time of cargo handling, the crew was required to inspect and clean the flame arrester, but due to climatic conditions and other factors, there was a problem that condensation was unexpectedly severe and the flame arrester was clogged.

Here, the design pressure of the cargo tank is designed to be 0.245 kg / cm2 for positive pressure and 0.07 kg / cm2 for negative pressure. Unless the wire mesh is clogged, the strength of the cargo tank is not a problem for normal loading of heated cargo.

When the wire gauze of the flame arrestor is clogged, the heating liquid is heated and kept warm by the heating pipe, and the cargo vapor in the gas space expands but has no outlet, and the cargo is discharged. It is stored in the tank. If the outside air temperature drops abnormally, the cargo vapor in the aerospace contracts, and the pressure inside the cargo tank becomes negative.

When the heating liquid is loaded, the volume of the gas layer space becomes gradually smaller and is accumulated in the cargo tank. Also, during unloading, the volume of the gas layer space gradually increases, creating negative pressure in the cargo tank.

In such a case, when the cargo tank is stored, there is a risk that the cargo tank may expand or burst, and the risk is high when the cargo tank receives a negative pressure. As shown in the figures above, due to the structure of the cargo tank, the negative pressure was only about one-third the strength of the positive pressure, and it was weak against buckling, causing the cargo tank to buckle and break. .

The present invention has been made in view of such inadequate points of the conventional technology, and its purpose is to reduce the possibility that even if the wire arrestor wire mesh is clogged, If the internal pressure of the cargo tank rises or falls below or above a certain level, a perforated panel that breaks due to a constant overpressure of the cargo tank will be provided to open the air space of the cargo tank to the atmosphere and protect the cargo tank. , Take safety measures.

[0120]

[Means for Solving the Problems]

 In order to achieve the above objective, the present invention is concerned with cargoes in which heated liquid such as molten sulfur or asphalt is loaded and unloaded into a cargo tank by a cargo line, and a flame arrester is provided at the end of the ventilation tube. In the tank, a tank protection device is provided in parallel with the valve by using a part of the pipe of the intake cylinder. The punch is torn by the disc guide on the pressure side, the breaker is torn by a certain overpressure, and the cargo tank is opened to the atmosphere.

[0130]

[Embodiment of the invention]

 In this invention, the heating liquid is loaded and unloaded, and cargo vapor is generated from the heating liquid. Cargo vapor in the gas layer space is normally discharged and inhaled from the flame arrestor at the end of the ventilation tube, and maintains the same pressure as the atmosphere.

[0140] However, a heated liquid at one hundred and several tens of degrees Celsius is loaded in the cargo tank, and there is a difference of one hundred and several degrees Celsius between the cargo vapor and the atmosphere. Sulfur or asphalt pitch is generated around the flame arrester. In this case, condensation of the cargo vapor occurs, and the wire mesh of the flame arrester itself becomes clogged. Although crew members are required to inspect and clean the flame arrester at all times, condensation may be unexpectedly severe due to weather conditions and clogging of the flame arrester may occur.

According to this invention, even if the flame arrestor becomes clogged, a tank protection device is provided by using a part of the piping of the ventilation fan, and the tank protection device reduces the internal pressure of the cargo tank. In order to open the air space of the cargo tank to the atmosphere when the pressure rises above or below a certain level, a perforated panel that breaks when the internal pressure becomes 0.245 kg / cm2 or more and -0.07 kg / cm2 or less is provided to protect the cargo tank. And take safety measures.

[0160]

【Example】

 To explain the embodiment, as shown in FIG. 1, the present invention loads and unloads a heated liquid 1 such as molten sulfur or asphalt heated to about 125 ° C. to about 200 ° C. into a cargo tank 2 by a cargo line 3 as shown in FIG. Is performed.

The cargo tank 2 is provided with a heat shield 6 having a certain thickness around the cargo tank 2 in order to prevent the heat liquid 1 from radiating heat, and a heating pipe 7 is laid at the bottom of the cargo tank 2. Heating and heating of No. 1 are performed.

When the heating liquid 1 is loaded and unloaded, the gas layer space 4 of the cargo tank 2 discharges cargo vapor from the tip of the ventilation tube 5 or sucks the atmosphere. At the end of the ventilation tube 5, a so-called frame arrestor 10 is provided to prevent fire.

When the heating liquid 1 in the cargo tank 2 is unloaded and the cargo tank 2 is emptied, the vapor space of the heating liquid 1 remains in the gas space 4 and is filled with, for example, hydrogen sulfide. The valve 8 provided on the cargo tank 2 is opened, the ventilation fan 9 is operated, and the atmosphere is forcibly sent from the intake cylinder 11 to the gas layer space 4 and the cargo vapor is discharged from the ventilation cylinder 5. Has become.

A tank protection device 12 is provided in parallel with the valve 8 using a part of the pipe of the intake cylinder 11, and is connected to the intake cylinder 11.

The tank protection device 12 is sandwiched between two flanges 13, 13 by a disc guide 15 on the positive pressure side and a disc guide 16 on the negative pressure side centering on the puncture disk 15.

The piercing disk 15 is made of a bodily fluid resin, the center portion of the disc guide 15 on the positive pressure side is hollowed out in a donut shape, and the disc guide 16 on the negative pressure side is similarly hollowed out in a donut shape. The area of the hole bored between the disc guide 15 and the disc guide 16 is 3 to 1. When a positive pressure of 0.245 kg / cm2 or more is applied to the cargo tank 2, the perforator 14 is torn and the cargo When a negative pressure of -0.07 kg / cm2 or less is applied to the tank 2, the piercing disc 14 is adjusted so as to be broken, and the cargo tank 2 is opened to the atmosphere and brought to the atmospheric pressure.

[0230]

[Effect of the invention]

 Since the present invention is configured as described above, the following effects can be obtained. The idea is that even if the wire mesh of the flame arrestor is clogged, if the internal pressure of the cargo tank rises above or below a certain level, the perforator breaks, the cargo tank is opened to the atmosphere, and the cargo tank It is intended to provide protection and take safety measures.

[Brief description of the drawings]

FIG. 1 schematically shows a cargo tank of the present invention.

FIG. 2 schematically shows a conventional cargo tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heated liquid 2 Cargo tank 3 Cargo line 4 Air layer space 5 Ventilation cylinder 6 Heat insulation 7 Heating pipe 8 Valve 9 Ventilation fan 10 Flame arrestor 11 Intake cylinder 12 Tank protection device 13 Flange 14 Perforator 15 Disk guide 16 Disk guide

Claims (1)

[Utility model registration claims] 1. A cargo line for loading and unloading a heated liquid such as molten sulfur or asphalt into a cargo tank by a cargo line. Utilizing a part, a tank protection device is provided in parallel with the valve, and the tank protection device is sandwiched between two flanges by a disc guide on the positive pressure side and a disc guide on the negative pressure side around the perforated board,
A tank protector for a solidifying liquid carrier, characterized in that the perforator is torn by a constant overpressure, and the cargo tank is opened to the atmosphere and brought to atmospheric pressure.