The high-temperature and high-pressure steam electric heater is a pressure-bearing electric heating equipment, designed with the core principles adhering to three categories of standards: pressure vessels, pressure pipelines, and electrical safety. It is also compliant with specialized industrial electric heating specifications. The key design requirements are summarized as follows:
1. Core National Standards: Steel pressure-bearing structures shall undergo strength calculations in accordance with GB/T 150 (Pressure Vessels) and comply with TSG 21 (Safety Supervision Regulations for Fixed Pressure Vessels). Electric heating systems shall follow SH/T 3203, while steam-based electric heating equipment shall refer to NB/T 10936. Pressure pipeline components shall conform to GB/T 20801. For international designs, ASME BPVC (Pressure Vessels/Boilers) and ASME B31.1 (Power Piping) may be referenced.
2. Structural Design Requirements: The design pressure of pressure-bearing components shall be ≥1.5 times the working pressure. For high-pressure conditions, use integral forged flanges and thick-walled seamless sleeves, with thermal expansion compensation and anti-vibration structures installed. The electrical and steam chambers shall be completely isolated, featuring a dual-seal structure, and the junction box protection rating shall be ≥IP54 (IP65 for outdoor use).
3. Materials and Thermal Design: Select materials for sheaths and housings based on temperature/pressure (e.g., 316L or 12Cr1MoVG for medium-high temperature and pressure, Incoloy/Inconel for ultra-high temperature and pressure); power density decreases progressively with increasing temperature (≤300°C ≤12W/cm², 300~500°C ≤8W/cm², >500°C ≤5W/cm²). Heating power calculations must account for steam flow rate, temperature/enthalpy variation, and 90%~95% thermal efficiency.
4. Electrical Safety Requirements: Insulation class ≥ F (preferably H), cold insulation resistance ≥ 1MΩ, in operation ≥ 0.5MΩ, pass 2000V/1min withstand voltage test; standard overcurrent, short circuit, and leakage protection (leakage trip ≤ 30mA/0.1s), heating elements equipped with overtemperature and dry burn protection.
5. Pressure/Temperature Safety: Install safety valves (set to 1.05~1.1 times the design pressure), configure dual monitoring with pressure/temperature transmitters and switches, and enable automatic shutdown alarms for overpressure/overtemperature conditions. Hydrostatic test pressure shall be 1.5 times the design pressure, with a pressure drop of ≤0.5% during holding. All pressure-bearing welds shall undergo 100% ultrasonic testing (UT), and 100% radiographic testing (RT) is required for high-pressure conditions.
6. Inspection and Verification: Non-destructive testing coverage for pressure-bearing components is required, with finite element stress analysis necessary for high-pressure structures. Thermal efficiency under rated conditions must be ≥90%, outlet temperature deviation ≤±2°C, and traceable quality records must be retained for critical processes.
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Post time: Feb-26-2026
