How to choose the right gas pipeline compensator

Here are some of the well-known brands recognized in the compensator industry that are widely recognized and have a great reputation. Although the ranking may change due to time and market conditions, the following brands are generally considered to be among the top brands in the valve industry: Water System Valves and Industrial ValvesThe following more influential first-line brands can be used as a reference, but are for reference only:

Suzhou Neway Valve, Shanghai Qizhong Valve, Shanghai Guanlong Valve, Sanhua, Su Yan, Shentong, Su Valve, Nanfang, Jiang.

First, the word Yao. The above manufacturers are only estimates and references, and the specific situation may vary or fluctuate at any time due to changes in a series of factors such as changes in the market, the size of the competition pattern, and the stability of product quality. As an indispensable key device in industrial production and civil facilities, the quality and reputation of the valve brand directly affect the satisfaction and trust of users.

These brands are known in the valve industry for their innovative technology, high-quality products and reliability. It is important to note that the market and industry are evolving rapidly, and different rankings may vary depending on time and region. For the most up-to-date ranking information, it is recommended to refer to industry reports, professional organizations or market research data for more detailed and accurate information.

The gas pipeline generally adopts a universal corrugated compensator, and the corrugated compensator should provide relevant data such as pressure, pipeline expansion, and medium temperature. For the gas pipeline of the steel mill, attention should be paid to the chloride ion content of the gas and the corresponding material should be selected. Corrugated compensator is a special equipment for pressure pipelines, do not buy blindly, and choose well-known brand product details or qualified manufacturers.

Answer]: a, c, d

This question assesses the installation requirements of the compensator of the gas pipeline network. The installation requirements of the gas pipeline network compensator are: (1) The compensator is often installed on the lower side of the valve (according to the direction of the air flow), and its telescopic performance is used to facilitate the disassembly and maintenance of the valve.

2) The installation should be coaxial with the pipeline and should not be deviated; The installation error of the pipe position shall not be adjusted by the deformation of the compensator with a bucket grip. (3) The guide of the bearing of the packing compensator shall be guaranteed to be free to expand and contract during operation. (4) The installation length of the packing compensator should meet the design requirements, leaving the remaining shrinkage.

Requirements for the installation and use of heating pipe compensators:

1. Before installation, the compensator should check its model, specification and pipeline configuration, and must meet the design requirements. 2. Attention should be paid to the direction of the inner sleeve to be consistent with the direction of medium flow, and the hinge rotation plane of the hinge type compensator should be consistent with the displacement rotation plane. 3. For compensators that need to be "cold tightened", the auxiliary components used for pre-deformation should be removed after the pipeline is installed.

4. It is strictly forbidden to adjust the installation deviation of the pipeline by the method of deformation of the corrugated compensator, so as not to affect the normal function of the compensator, reduce the service life and increase the load of the piping, equipment and supporting components. 5. During the installation process, welding slag is not allowed to splash on the surface of the corrugated shell, and the corrugated shell is not allowed to be damaged by other machinery. 6. After the installation of the pipe system is completed, the yellow auxiliary positioning components and fasteners used for installation and transportation on the corrugated compensator should be removed as soon as possible, and the limiting device should be adjusted to the specified position according to the design requirements, so that the pipe system has sufficient compensation capacity under environmental conditions.

7. All the movable elements of the compensator shall not be stuck by external components or limit their range of activity, and the normal operation of each movable part shall be ensured. 8. During the hydrostatic test, the sub-fixed pipe frame equipped with the end of the compensator pipeline should be strengthened so that the pipeline does not move or rotate. For the compensator and its connecting pipeline used for gas medium, it is necessary to pay attention to whether it is necessary to add a temporary bracket when filling with water.

The 96 chloride ion content of the water cleaning solution in the hydrostatic test does not exceed 25ppm. 9. After the hydrostatic test, the water in the wave shell should be drained as soon as possible, and the inner surface of the wave shell should be dried quickly. 10. The insulation material in contact with the compensator bellows should not contain chloride ions.

About the design of axial, transverse and angular compensators for piping systems and pipe racks.

a) Axial compensator.

1. For the pipe section where the axial compensator is installed, the main fixed pipe frame should be set at the blind end, elbow and variable section of the pipeline, and the parts equipped with stop valves or pressure reducing valves and the side branch pipelines entering the entrance of the main line. The main fixed pipe frame should consider the role of the hydrostatic thrust and deformation elastic force of the bellows. The thrust is calculated as follows:

fp=100*p*a

FP - the axial pressure of the compensator pushes (N), A - corresponds to the effective area of the average diameter of the ripple (cm2), P - the maximum pressure of the pipe in this section (MPa).

The formula for calculating the axial elastic force is as follows:

fx=f*kx*x

FX-compensator axial elastic force (N), KX-compensator axial stiffness (N mm);

f-factor, f=1 2 when "pre-deformed" (including pre-deformation x=0), otherwise f=1.

In addition to the above-mentioned parts, the pipeline can be provided with an intermediate fixed pipe frame. The intermediate fixed pipe frame can not consider the effect of pressure thrust.

2. Only one axial compensator can be set between the two fixed pipe frames of the pipe section.

3. The distribution of fixed pipe racks and guide pipe racks is recommended to be configured as shown in the following figure.

One end of the compensator should be close to the fixed pipe frame, if it is too long, the guide frame should be set according to the setting requirements of the first guide frame, and the maximum spacing of other guide frames can be calculated as pressed

lgmax - maximum guide spacing (m);

e-Modulus of elasticity of pipe material (n cm2);

i-TP Moment of Inertia of Pipeline Section (cm4);

kx-compensator axial stiffness (n mm), x0 - compensator positioning displacement (mm).

When the compensator is compressed and deformed, when the symbol "+" is stretched and deformed, it is conformed to "-" When the pipe wall thickness is designed according to the standard wall thickness, LGMAX can be selected according to the relevant standard.

From the manufacturer's sales volume, the Northeast region of the direct buried corrugated compensator, sales are relatively large, Jilin, Liaoning, Heilongjiang and other regions in the spring, summer and autumn in the three seasons of sales are quite large, this product compensation is large, at the same time there is a shell on the outside to protect the pipe, can effectively compensate for the displacement of the pipe, Gongyi Jiankun water supply equipment factory perennial production of compensators,

If you bury the ground with a direct burial, the general one can be used ordinary, and you need to find **Bangsheng pipeline equipment****.

The drum compensator is simple to install, small fluid resistance, but small compensation capacity and weak strength, and is generally used for large diameter, low pressure and fear of leakage.

Leaky medium is commonly used in blast furnace gas transportation. The drum compensator should be arranged in a bracket with a distance of no more than 6 m, and it should be generally arranged in the middle of two fixed brackets. The advantage of the drum compensator is that it is easier to make and the investment is cheaper; The disadvantage is that the corrosion resistance is not good.

At present, the most commonly used corrugated compensator on gas pipelines is the corrugated compensator. The most important element of the corrugated compensator is the bellows; The main properties include: compensation, elastic stiffness, compressive strength, stability, fatigue strength, etc.

Generally, when designing the pipe network, the corrugated compensator is required to meet the strength, stability and fatigue life under the premise that the compensation amount is as large as possible, and the stiffness value is as small as possible. The allowable compensation capacity of the corrugated compensator is generally calculated according to the maximum compensation capacity of 1 2 2 3. In order to prevent transverse protrusion, the wave number of the corrugated compensator should not be too much, and the commonly used is 1 4 waves, because too many waves will destroy the symmetrical deformation.

The ambient temperature of the corrugated compensator when it is installed is higher than the compensation zero point temperature, it should be pre-compressed, and if the ambient temperature at the time of installation is lower than the compensation zero point temperature, it should be pre-stretched. Generally, the materials used in the corrugated compensator are austenitic series stainless steel (such as 1CRL8Ni9Ti, 0CRL8NIL1) and carbon steel, and metal materials such as special alloys, high-temperature alloys, and high-nickel alloys, as well as composite non-metallic materials such as silicone rubber and fluorine rubber. This is currently the most widely used compensator in gas pipeline compensation, and can also be applied to steam, hot water, oxygen, nitrogen or other non-corrosive media pipeline systems.

The gas pipeline compensator uses the natural bending on the pipeline laying to absorb the thermal elongation deformation of the pipeline.

I am Jiangsu Liantianhong Machinery, welding rod choice, I think there should be the following points:

1. It is strictly forbidden to use welding rods with cracking, peeling, deterioration, eccentricity or serious corrosion of the welding core;

2. Before the use of welding rod and flux, it should be baked according to the specified requirements, and the general baking temperature of acid electrode is 150-200'c. The baking temperature of alkaline electrode is 350-400'c, after drying, put in the 100-150 electrode incubator, take it with use, and bake the electrode in strict accordance with the requirements of the electrode manual, and can not be replaced by a lower drying temperature and a longer baking time, and it is not suitable to repeat drying;

3. Before the compensator welding construction, the groove of the welding wire and the base metal and both sides should be cleaned to completely remove oil, moisture, rust spots and other dirt;

4. Select the appropriate welding current and welding speed, and use short-arc welding, in order to facilitate the full escape of gas, avoid porosity defects, and preheat can reduce the cooling rate of slow melting;

5. When welding, it should be prevented from the influence of harsh environments such as wind and rain, and the wind shield should be set up when gas shielded welding is carried out outdoors, and the influence of wind in the pipe should be paid attention to when welding the pipe;

6. Pay attention to the purity and moisture content of the gas during gas shielded welding, and must comply with the provisions of the relevant standards, after the carbon dioxide cylinder is poured for a period of time, the residual water in the gas cylinder can be released from the cylinder valve, and the water content in the carbon dioxide gas can be reduced.

7. Neutral flame should be used for carbon steel gas welding of the compensator, and the operation should be skilled and coordinated.

As for how many times to weld, it depends on the on-site operation and the proficiency of the welding personnel.

In order to reduce the thermal stress of the pipeline, compensators are generally installed between the pipes, or the bending signal of the pipe itself is used to compensate automatically. In the configuration of the pipeline, priority should be given to the use of natural compensation for the bending of the pipeline, which is the best way to use the self-compensation of the length change of the pipeline itself, and when the natural compensation can not meet the requirements, the compensator can be set.