In summer, when the air pressure is low and the fish floats, the fishing bottom has no mouth and the

There are many reasons why fish float off the bottom. One of the most peculiar reasons is that the oxygen content of the water is significantly reduced. The fish feels a lack of oxygen and floats. down. The distribution of oxygen in water follows the following pattern: the shallower the water layer, the higher the oxygen content near the water surface. As water depth increases, the oxygen content gradually decreases. .

In addition to being able to float from the bottom in the absence of oxygen, fish can also float from the bottom in order to search for food, for example when fishing . , because bait and nest materials are continually thrown into the water, some foraging fish will not wait for food to arrive at the bottom of the water, but will float from the bottom to a layer of shallower water for rivalser for food.

But that doesn't mean all fish will do this. Some fish with a weaker appetite or constitution will still search for food on the bottom. the bottom to look for food. This is a partial situation, so we can imagine that if we abandon bottom fishing and switch to floating fishing, the conclusion is that we can only catch fish that float on the bottom, and we cannot not catch the fish that does not float from the bottom.

Therefore, when the fish only partially separates from the bottom and floats upward, the most effective fishing method is not fishing the bottom, but fishing stroke, that is. that is to say, reduce the sinking of the hook and bait by adjusting the fishing angle lower and lower while reducing the proportion of bait speed, if you encounter a fish floating on the bottom to search food, you don't haveno need to wait for the hookbait to sink to the bottom, just do it. immediately lift the rod. If there are no fish searching for food when the hook bait sinks, you can also wait until the hook bait sinks to the bottom of the water, then fish for those fish searching for food at the bottom of the water.

Under normal circumstances, fishing is not recommended in this kind of weather, but some fishing friends only fish once and a half a day. week, so even if they know the temperature I won't do it. Okay, I grit my teeth. In this principle, if you check the weather forecast in advance and know that the weather will not be good on the day of fishing, you should choose the fishing position carefully. If you haven't looked at the weather forecast, or the weather was fine when you went out in the morning, but the temps changed later, and you feel that you have sweated very little, but your body is sticky and your breathing is not so smooth, you should think about it at that time. It is air pressure that affects the fish's mouth, so you should not be afraid to change position in case of danger.

The amount of dissolved oxygen in water is closely related to air pressure, but that does not mean it is related only to air pressure. Whether it is still water or running water, whether it is windy or not, and whether it is shaded, all of this has a certain orientation. Keep in mind that fish have very obvious oxygen-hunting characteristics in the summer. If the dissolved oxygen is slightly higher than other parts, there may be more fish and the mouth opening conditions will be stronger. The first thing is to find a whitewater fishing position, especially uA slow flow or even a trickle of still water will attract fish to such a position. For example, the area around the upstream water inlet is a very good choice because the flowing water contains sufficient dissolved oxygen. There are also rivers and reservoirs with locks, and there may be runoff around the locks, which are also good fishing areas in summer.

What is the standard for water pressure?

Summer is coming and the weather is getting warmer. As it gets warmer, people live. the habits of the fish will change. The sex also begins to be different from spring. As the weather gets warmer, we want to fish, and fishing methods also need to change accordingly, so we can catch something.

On sunny summer days, the surface temperature ofwater increases rapidly due to the sun's rays and hot weather with low atmospheric pressure. occurs often. Not only are the fishermen friends intolerable, but also the fish in the water are also intolerable. It's too hot and uncomfortable, and I don't want to open my mouth. What I thought was that the temperature with light rain and thunderstorms is particularly suitable for fishing.

Before it rains, because the clouds thicken and slowly dissipate heat, you will be very hot, the dissolved oxygen in the water will decrease and the fish will stop searching for food. the food. When it starts to rain or shortly after it rains, the temperature decreases and the air pressure increases. At the same time, precipitation falling from the sky will increase the dissolved oxygen in the water. At this time, the air is cool, convection occurs in the upper and lower layers of water, oxygenDissolved ene increases, there is more food and the fish become very active. It's a good time to fish in the summer. If accompanied by a light wind of level 2-3, the effect will be even better.

Especially at noon, the temperature continues to rise. Fishing enthusiasts sitting on the shore risk suffering from heatstroke, and fish in the water will lose their appetite. On such a hot day, we decided to avoid it and find another cool water area to continue fishing, so as not to lose the two mermaids.

Cool places for fishing are easy to catch big fish, so we can choose fishing places under the shade of trees, behind hills and under some bridges, as long as it There's enough shade, big fish. will stay for a long time. Stay away from heat. But is it enough to choose a fishing spot in the shade? not enough. An experienced fishing enthusiast hassummarized his many years of experience and concluded that grayling fishing positions must also have these three characteristics, and that none of them are essential.

The water at the water flow is refreshing, rich in food, sufficient dissolved oxygen, suitable water temperature and active fish. Therefore, on both sides of the water flow, choose the hook next to the aquatic plants and gravel near the slow water flow, and you will definitely get good results. However, in calm water, because there is no movement in the water, the dissolved oxygen in the water is very low, which can be called a turbid water area, which can easily lead to hypoxia for fish. Fish definitely don't like to stay. in this type of maritime area.

Legal analysis:

1. When the hydrostatic pressure during the hydraulic pressure test is the working pressure du pipeline and the test pressure should not be less than 0.8. kg if the pipeline working pressure is less than 0.8 kg, then the hydraulic test pressure is 0.8 kg. The pneumatic test should not replace the hydrostatic test.

2. The length of the hydraulic test of the pipeline should not exceed 1,000 meters. For pipe sections with accessories in the middle, the length of the hydraulic pressure test section should not exceed 500 meters. Pipes of different materials in the system must be pressure tested separately.

3. The end of the pressure test pipe section should be inspected for firmness and reliability. During the pressure test, the supporting facilities are strictly prohibited from loosening and collapsing, and the valve is prohibited from coming loose. used as a sealing plate.

4. Pressurization must use mechanical equipment with un measuring device, and the accuracy should not be less than 1.5 (the maximum allowable error does not exceed the maximum scale of 1.5%), and the measuring range should be 1.3. ~1.5 times the test pressure, the dial diameter is not should be less than 150mm.

Water pipe pressure testing is one of the commonly used methods to judge whether the water pipe connection is reliable. If the water pipe connection is not good, leaks and other conditions will occur, leaving hidden dangers for the home. use of water. Commonly used pressure testing tools include cylinders, pressure gauges, water tanks and connecting pipes. The pressure measurement method is to connect the hot and cold water pipes together, connect the pressure tester to any water outlet and the pressure pointer is zero. The pressure test can only be carried outwhen all water pipe passages are welded. Before the pressure test, all plugs must be sealed and the main water inlet pipe valve must be closed. When measuring pressure, shake the pressure rod of the cylinder until the pressure gauge needle points to about 0.9-1.0, and maintain this pressure value for a while. Different water pipes have different pressure measurement times. For welded pipes such as PPR, aluminum-plastic PPR and steel-plastic PPR, it takes more than 30 minutes. For aluminum-plastic pipes and galvanized pipes, the pressure measurement time is 4 hours. . When the hydrostatic pressure in the hydraulic test is the working pressure of the pipeline, the test pressure shall not be less than 0.8 kg; if the working pressure of the pipeline is less than 0.8 kg, the hydraulic test pressure shall be 0.8 kg; The press testAir ion should not be used in place of hydraulic pressure testing; the length of the pipeline hydraulic pressure test should not be more than 1000 meters. For pipe sections with accessories in the middle, the length of the hydraulic pressure test section should not exceed 500 meters. Pipes of different materials in the system must be pressure tested separately.

Legal basis: "Standardization Law of the People's Republic of China"

Article 1 In order to strengthen the work of standardization, improve the quality of products and services, and promote scientific and technological progress. This law is formulated to protect people's health and safety of people and property, maintain national security and ecological environment safety, and improve the level of economic and social development.

Article 2 Standards (including standards)standards) mentioned in this Law refer to technical requirements that must be unified in the fields of agriculture, industry, service sector, social enterprises and other fields.

Standards include national standards, industry standards, local standards, group standards and corporate standards. National standards are divided into mandatory standards and recommended standards, while industrial standards and local standards are recommended standards.

Mandatory standards must be implemented. The State encourages the adoption of recommended standards.

Article 3 The tasks of standardization work are to formulate standards, organize the implementation of standards, and supervise the formulation and implementation of standards.

People's governments at or above the county level should integrate standardization work into the national plan.e economic and social development at the same level and include standardization work funds in the budget at the same level.