50,000 cubic meter crude oil tank converted to store residue oil

It’s definitely possible, but pay attention to the heat retention requirements of the two types of oils; be careful when replacing the sealing materials! My situation is the same as yours; there were no problems after going out for inspections, and there are examples in Shenyang.

No problem! It may involve a heating system

Floating roof or arch roof? The problem won’t be too serious.

Factors such as the freezing point and viscosity of the oil are primarily taken into consideration; it may be necessary to install an internal steam heating system in the oil tank as well as insulation on its outer wall. Other pipeline transportation facilities may also need to be modified.

It’s unlikely to work; 50,000 units are generally used for floating roof tanks. If it’s to be changed to a residue tank, considerations must be given to the sealing capacity required for heating residue. As far as I know, sealing performance cannot be guaranteed at temperatures above 70 degrees.

In the case of a floating roof tank, if its purpose is to be changed and it is to be modified according to the properties of the medium stored, steam from residue oil can be used for heating and sealing; a grid-type roof can also be installed. For such modifications, design verification is required, approval from the relevant authorities must be obtained, and documentation must be prepared after the construction is completed

50,000 cubic meter crude oil tanks are usually floating roof tanks; converting them to store residue oil does not ensure an appropriate storage temperature for such oil. If the heaters in the existing tanks are modified, although this will increase energy consumption, the long-term operating costs will be very high.

(1) Since residue oil needs to be stored at a high temperature of around 110–130 degrees, please consider the design temperature of the original storage tank； (2) If storage is possible, it is necessary to increase the heat exchange area of the steam tracing pipes inside the tank, that is, to increase their length and diameter, as well as the thickness of the insulation layer. We have done similar things in the past!

There are likely risks in such an approach. 1. Since the storage temperatures for crude oil and residue vary, different heaters need to be used for modification. 2. As residue contains many components, there is a high possibility of the presence of light hydrocarbons; could this lead to a flash explosion during heating? 3. Since the temperature of the residue oil is between 110 and 130, could there be a situation of ebullioscillation? If it is an internal floating roof, this could pose a risk :lol This is just an unrefined opinion; I hope everyone will discuss it

The main change required is to the heating system, but a 50,000 cubic meter crude oil tank must be an external floating roof tank, making the renovation work quite extensive. The oil pipe is stored at 130 degrees, and structurally, there should be no problems.

It’s definitely not possible to modify residue oil directly. The crude oil tank is a floating roof tank; the primary and secondary seals of the floating roof are designed to function at temperatures below 70 degrees. The emergency drainage outlet is sealed using water, and the design of the floating roof tank takes into account the possibility that if water cannot be drained properly or if the central drainage pipe fails, the water will accumulate inside the tank, thereby preventing the floating roof from sinking ； The feed temperature of residue is generally close to or above 100 degrees, and if boiling occurs in the incoming water, it can cause serious problems. It can’t be used if these problems aren’t solved. The residue tank should be a vaulted tank; it is too difficult and uneconomical to convert a floating roof into a vaulted one. Moreover, it is still uncertain what the performance of the 60m mesh shell vault will be. When increasing the design temperature of the storage tank, it is necessary to take into account the reduction in strength as well as the impact of temperature differences, and the liquid level should be lowered accordingly ； It is necessary to consider whether the asphalt sand on the base backfill layer is affected, among other things. It is recommended to convert other dome tanks for use with residue oil, as the modification is much simpler, or to build new ones outright.

It should not be a big problem; the crude oil is quite heavy at the moment, so the heating coil needs to be replaced to increase the heating temperature. It’s also necessary to consult professionals in equipment and water supply/pumping systems.

A comprehensive consideration is necessary, with the following factors playing a role: ① Operating conditions: What changes will occur as a result of alterations in operating conditions? For example, the storage temperature for crude oil is generally between 40–60°C, while that for residue oil is around 90°C (it should not exceed 100°C, as exceeding this temperature can lead to azeotropy, resulting in overfilling of the tank). Changes in operating conditions also affect the material used; the material for tanks with a capacity of 50,000 cubic meters needs to be carefully selected, as it is greatly influenced by the properties and temperature of the stored material. ② Design parameters: The design parameters for crude oil tanks and residue oil tanks differ, with temperature being the most important factor, followed by the material used. Sulfur content and acid value also have an impact on the material, and these factors must be taken into account when designing storage tanks. ③ Tank structure: Large-capacity crude oil tanks usually employ a floating roof structure to reduce evaporation losses, whereas residue oil tanks more often use a fixed-roof structure. However, some residue oil tanks do use floating roofs as well, but the type of floating mechanism and sealing system vary. Temperature changes can affect the structure of the roof. ④ Internal structure: This includes heating coils, dehydration measures, and other internal components, all of which can change........... Additionally, overall layout considerations are also important. In this case, however, changing the flash point of the stored material from low to high should not affect the overall layout. This post was last edited by Free to come and go on 2008-7-6 at 12:36