Is it possible to unload the tanks in the chemical plant area without using a dip pipe?
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This post was last edited by jjackal on 2012-6-29 at 16:56. It’s a non-professional storage area; it’s simply a set of tanks used to ensure a supply of raw materials for production. The materials are delivered by tank trucks. Is it necessary to install loading/unloading nozzles in accordance with petrochemical standards? Can hoses be used instead? If so, how should the spacing between them be determined? The materials include Class A, B, and C substances. Please explain the reasons behind this approach and how it can be justified
Truck delivery, hoses – learn* it a bit, from below: lol:lol:kiss:
Unloading with flexible hoses is acceptable; currently, only rigid pipe skids are required for liquid hydrocarbons. The spacing can be found in the design specifications.
Metal hoses for loading and unloading materials delivered by tank trucks are fine, but it is necessary to ensure that the arriving vehicles do not block the fire exits, and there should be no open flames in the vicinity during loading and unloading; the distance should be sufficient outside the fire wall of the storage tank.
Please refer to GB50160 – Storage and Transportation Facilities: Vehicle Loading and Unloading – for what you need
It seems that the regulations for the petrochemical industry don’t mention hoses; could someone upstairs explain this in more detail?
When handling chemical hazards, a loading arm is now required; however, metal hoses are still used in many places for this purpose as well, and they can also serve to load and unload items. In terms of safety, they are certainly not as good as loading arms.
It depends on what liquid is being unloaded; most chemical products can be unloaded using metal hoses
Is it one-sided to say that the loading/unloading arm has higher safety than metal hoses? What is the basis for this claim?
Generally speaking, there are a relatively large variety of chemical products. Storage and transportation mainly involve the use of dip pipes during loading and unloading. The main targets are storage tanks (usually over 500 cubic meters), as well as the intermediate zero-level tanks. As for small tanks, which come in a variety of types, hoses are used quite often. It is convenient for operations, but the downside is that there is a lot of residual liquid, and the workload for workers is high; it is suitable for unloading. For loading, it is recommended to use a dip pipe setup. The spacing between loading stations depends on your storage and transportation volume; for tasks involving a small number of units, a spacing of more than 2 meters is generally sufficient. If multiple vehicles are loading and unloading simultaneously, the length of the flexible hose must be at least equal to the length of the tank truck, ideally 15 meters or more.
For chemical warehouses that have a large variety of products in relatively small quantities each, since these chemicals cannot be mixed with one another, using metal hoses for loading and unloading offers certain advantages. In particular, the spacing between hoses can be kept very small, allowing multiple sets of pipes to be arranged in a limited space; whereas the use of flexible connectors is restricted by such constraints. For cases where the handling volume for a single variety is large, it is better to use a flexible hose. Now, swivel hoses are being used, and the spacing between them is relatively small. However, these swivel hoses are mainly intended for transporting oils; the seals of the quick-connect fittings according to API standards may not meet the requirements of all chemical products.