Please recommend a reliable fire-fighting pipe fitting?

1. Drainage fire-fighting fittings: ordinary drainage cast iron socket pipes and fittings. Flexible seismic interface drainage cast iron straight pipe, which is sealed by rubber ring and fastened by bolts, has outstanding flexibility and flexibility under internal water pressure. It can adapt to large axial displacement and lateral deflection deformation, and is suitable for indoor drainage pipes in high-rise buildings, especially in earthquake-stricken areas.

2. Water supply cast iron pipe: slightly high, thin-walled, pressure-resistant, impact-resistant, corrosion-resistant and earthquake-resistant. The pipeline interface adopts flexible interface, which also has certain elongation and deflection angle. It has the advantages of pig iron pipe and steel pipe material, and avoids the disadvantages of steel. The cast iron pipe for water supply has high pressure and is suitable for conveying pressure fluids such as water and gas.

3. Sand centrifugal fire-fighting straight pipe: The raw material of sand centrifugal cast iron straight pipe is gray cast iron, which is suitable for conveying pressure fluids such as water and gas.

4. Continuous fire-fighting straight pipe: The continuous fire-fighting straight pipe is a gray-mouth fire-fighting pipe for continuous fire-fighting, which is suitable for conveying pressure fluids such as water and gas.

Working temperature and use effect of fire-fighting pipe fittings;

When installing fire-fighting fittings, it is necessary to refer to some standard parameters of pipelines and fittings, such as the relationship between test pressure and nominal pressure of grooved fittings for pipeline installation, working temperature and service effect of fittings, etc. These factors need to be considered before pipeline installation. After referring to such factors, the selection of grooved pipe fittings installed here will greatly improve the model and installation effect.

The nominal pressure of pipe fittings refers to the compressive strength at the reference temperature, but in many cases, pipe fittings do not work at the reference temperature. With the change of temperature, the compressive strength of pipe fittings also changes, so the working pressure of products with the same nominal pressure value is different at different temperatures. For example, the relationship between nominal pressure and working pressure of high-quality carbon steel pipe fittings in different ranges is shown in the following table, and the maximum working pressure of other pipe fittings of various materials at different temperatures.