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1. What are the requirements for the guide tube? It is required that no dirt accumulate in the guide tube, and it should be designed to allow dirt to be removed at any time. 2. What regulations should be followed when installing fire suppression steam pipes? Fire suppression steam pipes shall be installed in accordance with the following rules: (1) Generally, for each 100 m3 of volume in the radiation chamber, one fire suppression steam pipe with a nominal diameter of 40 mm shall be installed. (2) When using elbow fittings with plugs, or in welded elbow boxes where the medium is highly corrosive and erosive, a fire-suppression steam pipe should be installed. 3. What is the function of the furnace fire-extinguishing steam pipe? What should be done when there isn’t enough of such a pipe? The main purpose of the furnace fire-extinguishing steam pipe is to supply steam in order to displace and remove the explosive gases inside the furnace, thereby achieving fire suppression and explosion prevention. When the steam injected through the fire-suppression steam pipe is insufficient, steam can be injected into the furnace from the burner. 4. What type of steam is used for the furnace fire-extinguishing steam pipes? Superheated steam is used for these pipes; low-pressure steam and saturated steam cannot be used. 5. How should the specifications and material of the furnace fire-extinguishing steam pipes be selected? The furnace fire-extinguishing steam pipes can be of ϕ45×4mm or ϕ60×4mm in specification, with 10# or 20# seamless steel tubes being used as the material. 6. By how much is the cross-sectional area of the main steam pipe for furnace extinguishment larger than that of the branch pipes? Why? It is generally required that the cross-sectional area of the main steam pipe for furnace extinguishment be 1.5 times larger than that of the branch pipes, and this is to ensure that there is sufficient steam in each branch pipe, so as to quickly remove the explosive gases from the furnace. 7. How are the location and number of pressure tubes in the heating furnace determined? The location and number of pressure tubes in the heating furnace are determined in accordance with the following rules: (1) At least one pressure tube shall be installed at the furnace bottom, at the inlet to the convection chamber, and below the chimney baffle. (2) Pressure measuring tubes for calibration are added separately as needed. 8. How are the location and number of temperature measurement points in the heating furnace chamber determined? The location and number of such measurement points are set according to the following rules: (1) At least one temperature measurement point shall be installed at each of the outlet of the radiation section and the outlet of the convection section. (2) Temperature measurement points should be installed at the outlets of each chamber in the multi-chamber furnace. (3) Temperature measurement points for calibration can be added as needed. 9. How is the location of the temperature measurement points on the heating furnace tubes determined? The locations of these temperature measurement points are set according to the following rules: (1) There should be temperature measurement points at both the inlet and outlet of the medium, and the thermocouples should be installed in the opposite direction to the flow of the medium. Generally, these temperature measurement points are installed on the process pipelines. (2) For heating furnaces with a heat load of over 20 MW, temperature measurement points should be installed on the oil transfer lines exposed to radiation. When the furnace tubes are multiple, or when nail-head tubes or finned tubes are used in the convection section, it is even more important to install temperature measurement points on the oil transfer line. (3) When there are multiple furnace tubes, it is very important to install temperature measurement points and flow meters at the outlets of each tube. 10. How is the location of the pressure gauge in the heating furnace determined? Pressure gauges should be installed at both the inlet and outlet of the medium for each furnace tube, in order to measure the pressure at these points (they are usually installed on the process pipelines).