Metal hose setup

Mainly considering the settlement problem of large storage tanks, metal hoses are generally installed at the inlet and outlet.

Please refer to the interpretation of this provision: 6.0.16 Under the action of earthquakes, one of the common earthquake damages is that the connection between the oil tank and the piping is damaged due to the tilting of the tank wall or the uneven settlement and tilt of the tank foundation. For example, in the Loma Prieta earthquake in California, USA, on October 17, 1989, all the damaged oil tanks in the oil refinery located in the earthquake area were related to the warping of the tank walls. In addition, due to improper handling of tank foundations, the foundations of some oil tanks will still experience significant settlement after being put into use, resulting in damage to pipelines and tank walls. In order to prevent the occurrence of the above damage, certain measures can be taken to increase the flexibility of the oil tank piping to eliminate the influence of relative displacement. For example, a metal hose can be installed on the pipe connected to the tank wall or the shape of the pipe can be made sufficiently flexible. In addition, the oil tank inlet and outlet pipes adopt flexible or flexible connection methods, which can also absorb the thermal expansion and contraction displacement of the pipes and reduce the thermal stress of the pipes.

Learn together* , I also have a question about this, how to choose a metal hose? ? have * * Standard? Every time I encounter a metal hose, I don’t know how to choose it. Could you please explain it to me?

On the 5th floor, there are standard ones, such as: SY/T4073, SH/T3412 hose standards can be searched on the forum.

Prevent settlement and vibration:handshake:handshake

Mainly considering the different settlement problems of storage tanks and pipelines, metal hoses are generally installed at the inlet and outlet.

I have seen that Japan does not use metal hoses or corrugated compensators in the seismic design of large storage tanks, but uses the flexible design of the steel pipe itself for seismic compensation. If it is anti-seismic or anti-settlement, it is recommended to use flexible pipe design instead of hose type.

Requirements in Article 5.1.3 of the "Regulations on Operation and Management of Crude Oil Stations and Pipeline Networks" (SY/T6067-94): When new oil pipelines are connected to oil tanks above 5000m3, flexible connection devices should be used.

Mainly to consider the settlement problem of large storage tanks, metal hoses are generally installed at the inlet and outlet.

I think we should consider the issues of earthquakes, pressure suppression, and subsidence, with special attention being paid to pressure suppression. Please pay attention to this.

The purpose of setting up a hose is to prevent the settlement of the tank from causing damage to the pipeline in front of the tank. Choosing a hose mainly depends on the diameter of the pipeline in front of the tank and geological data. Geological data can indicate the approximate final settlement of the tank, so you can choose a hose.

The 2nd and 4th floors are right. The main consideration is the settlement of the oil tank.

Installing metal hoses has the following benefits:: 1. It can solve the stress problem of the tank wall and pipeline when the tank settles. 2. It can solve the stress caused by thermal expansion and contraction of pipelines. 3. When repairing valves or disassembling pipelines, there can be gaps for easy disassembly and assembly. Our oil depot was originally designed to be rigidly connected without adding hoses. Although this is allowed by the specification, it is very inconvenient when we actually use it. When I wanted to repair the valve, due to stress, the valve flange was squeezed so tightly that it was impossible to remove it. So I suggest that metal hoses must be added. Secondly, when there is no metal hose, the storage tank will definitely sink after being used for a period of time. If it is a newly built storage tank, the settlement amount will generally be greater. This is because if the metal hose is not installed, the flange surfaces will not be parallel under the action of stress, so the seal will not be very tight and leakage will occur. So metal hoses should be added!

I think the analysis by the poster on the 15th floor is very reasonable.

How is the length determined? I heard it would be better if it is thinner and more flexible? It is said that the manufacturer sets the thickness according to flange standards. In fact, some units use 16 kg flanges, but the actual pressure may be only 5 kg.

Metal hoses are generally installed at the inlets and outlets to prevent inconsistent settlement of storage tanks and pipelines and damage to the equipment.

The hose is resistant to earthquakes, as well as expansion and contraction due to heat and cold.

It’s an old post. I’ve been doing something similar recently, so I’ll add a little bit.: I have seen some storage tanks on site. They are actually very small, only 500 to 600 cubic meters, and do not reach the 5000m3 standard at all. However, after long-term use, the rigid pipelines, especially the connection with the pump, have become severely deformed. In places such as fire embankments, the space is small, and it may not be practical to design flexible pipes, so hoses should still be added.