Why is a branch created for the process supervisor’s section, with a branch valve installed only when there is a process requirement?
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As the title suggests, all pipelines directly under the control of the utility engineer require isolation valves, while process pipelines are installed only when there is a need in the process itself. What is the reason for this difference? For example, no valves are installed on the process pipes of heat exchangers, but valves are required for the cooling water pipes. I know the reason for this, but what about the branch pipes of the process pipes?
For shared systems, a large proportion of the components are not in use on a regular basis; valves installed above the main pipes serve to shut them off when not in use, as well as to prevent freezing during winter. From a technical perspective, the need for valves at the root is similar in nature; this includes protection against condensation, clogging (deposition of impurities), freezing, corrosion, and so on.
Hand valves are primarily used for cutting off flow; there are situations where such cutting off is necessary, such as when a branch pipe is not used frequently. Specific analysis.
Utility pipes are generally shut down completely, with only the control systems remaining in operation. Process pipes serve the entire workshop or factory; for example, compressed air, natural gas, water, and steam are always in use. When processes are divided into separate units, not all of these pipes are needed – their use depends on production volume. Some systems remain in standby mode, and they can be isolated using valves. However, this is not the case for production materials, as these materials have different states and properties, and it’s not possible for them to also be in a standby state. If a production line comes to a stop, it is necessary to recover or remove the materials from it. Sometimes, there are slight differences in requirements or processes between different batches, which means that those materials cannot be kept in standby mode either, due to differences in their state and properties.
It seems like this of yours isn’t well-organized? Does that mean that utility systems are designed to serve the entire workshop, so partial shutdowns may occur, and therefore isolation valves are needed? As for the process pipes, unless necessary, if there are problems, the entire installation will come to a stop. There is no need to add valves; moreover, doing so increases costs and creates additional points of leakage
{:3_47:} Many devices are connected in series; the gas-phase pipeline involved in the reaction usually has only one valve, while valves are generally not installed on the subsequent devices (which are mostly condensers). Valves are present at both the liquid-phase inlet and outlet. As for the service side, the devices are typically connected in parallel, and control valves are used to regulate flow rate, temperature, and pressure
Why are there no valves on the process pipes of the heat exchanger? Without valves, how can the heat exchanger bypass be added? The situation you mentioned does exist as well; it usually involves relatively critical equipment, and once a problem occurs, the entire installation (unit) has to stop operating. In such cases, installing valves isn’t very useful, as it may instead increase the number of leakage points
{:3_54:} I’ve seen auxiliary lines used in absorption towers to prevent pressure buildup. . . I’ve never seen a heat exchanger before. . Is it multi-stage condensation or a bypass line added for parallel condensation?
{:3_54:} I’ve seen auxiliary lines used in absorption towers to prevent pressure buildup. . . I’ve never seen a heat exchanger before. . Is it multi-stage condensation or a bypass line added for parallel condensation?
@618705 {:3_54:} I’ve seen absorber towers equipped with a bypass line to prevent pressure buildup. . . I’ve never seen a heat exchanger before. . Is it multi-stage condensation or a bypass line added for parallel condensation?
Simple and clear: no shut-off valve is needed when they start and stop together, but one is required when they start and stop separately. Utility pipelines are not in use all the time; they need to be kept in standby mode, and isolation valves are used for cutting off flow during this standby period. In process pipelines, it is generally not the case that a particular unit or equipment is kept in standby (except when it is being switched on or off), so adding valves increases the construction costs.