Problems with loading and unloading flexibles

Perhaps everyone doesn’t pay much attention to this, and there aren’t many examples of this standard to be seen.

Similar questions have been discussed many times on the forum; the original poster can search first. For purging and pressure testing, the procedures applicable to petrochemical plants can be followed; there should be nothing special about it. If there are any special requirements, they have been taken into account during the process design.

There should be a solution; when performing purging or cleaning, use plugs to seal those static equipment units to prevent anything from getting in :)

Make sure that equipment such as pumps and flow meters are isolated to prevent impurities from entering.

The train platform is long, making it difficult to compensate for pipeline movements; therefore, it may not be suitable for purging with high-temperature media such as steam. As for the flexible hose, which is fitted with flanges, there is no need for purging.

When purging with a flexible hose, 1. ensure that equipment such as pumps and flow meters are isolated to prevent the entry of impurities; alternatively, these devices can be removed and replaced with short circuits for purging purposes. 2. Begin the purging process with nitrogen first, followed by heating with low-pressure steam, in order to achieve the desired effect of eliminating flammable gases. But the steam temperature must not be too high. Experience shows that keeping the steam temperature below 100 degrees is sufficient. 3. The hose contains seals, which are usually made of polytetrafluoroethylene or with steel plates added; these seals tend to soften at high temperatures, allowing slag to penetrate and scratch the sealing surface, thereby causing leaks. The same issue applies to equipment instruments and ball valves, so this must be kept in mind during line cleaning. 4. The flexible hose, also known as a loading/unloading arm, allows the vertical tube (made of aluminum) to be removed during cleaning; it is then reinstalled after the pipeline has been treated with steam. 5. It is imperative to avoid performing line sweeping when the ambient temperature is low, as the trestle is long; poor thermal expansion or compensation can easily lead to the rupture of the welds, resulting in accidents.

Regarding the pressure testing and purging for this section, refer to the manual for petrochemical plants; purging can be carried out section by section. The valves and other pipe fittings have already been subjected to pressure testing

I am from a manufacturer of flexible hoses. The hoses produced by my company are equipped with \"vacuum breakers\" (a standard feature of hoses used for loading operations). After the operation is completed, the vacuum breaker allows the flow line of the hose to be connected to the atmosphere, allowing the medium inside to flow out. As a result, there is little medium left in the hose line, so purging is not necessary; it is only required for substances that are prone to solidification, such as liquid sulfur or asphalt.

I agree with what the guy on floor 8 said; that’s basically how pipeline purging is carried out at jetty areas. Generally, all equipment and instruments such as flow meters, filters, pressure relief valves, PCV valves, electro-hydraulic valves, FCV valves, check valves, ball valves, and gate valves need to be removed. Where short pipes need to be connected, they are connected; where blind flanges are needed, they are used. Transfer hoses are not subjected to purging. I’m referring to the commissioning of a new plant: During purging, compressed air is used first for this purpose. It is required that pressure gauges be installed at both the compressor outlet and at the ends of the pipes, with burst disks set up at those ends. The principle for purging is to start with the main lines, then the side lines, and finally again the main lines. Ensure that the purging reaches the specified purging level. For instrument pipelines, purging should be carried out using instrument air (purified air), and a purge test run should be conducted to check the performance of the instruments. For pipelines that are subject to thermal expansion, such as LS low-pressure steam lines, it is necessary to purge them with steam, carrying out repeated processes of heating the pipeline, introducing steam, and purging – three times in total – until the required standards are met! These are also things I see every time our factory conducts purging operations; they might not be completely comprehensive. Let’s learn together* – if there’s anything incorrect, please let me know at QQ278874930

It’s similar to pipeline purging in refineries. Use steam instead of compressed air.