This Standard specifies all the requirements of metal tube electric heating element (hereinafter referred to as element), including product classification, technical requirements, test methods, inspection rules, order and supply.
This Standard is applicable to the tubular electric heating element with working voltage not exceeding 440 V and by adopting metal tube as enclosure, which is designed and manufactured in accordance with the requirements of Articles 3.1, 4.1 and 4.2.
This Standard is not applicable to the daily tubular electric heating elements or the elements of similar purposes.
For the elements used in vacuum or in environment where absolute pressure of medium exceeds 1MPa as well as elements with special requirements, they shall meet not only this Standard, but also the corresponding standards with special requirements.
1 Main Contents and Applicable Scope
2 Terms
2.1 Metal Tube Electric Heating Element
2.2 Lead-Out Rod (Wire)
2.3 Stretched Length (L); mm
2.4 Heating Length (t), mm
2.5 Heating Surface Area, cm2
2.6 Surface Loading, W/cm2
2.7 Sufficient Heating Condition
2.8 Rated Voltage, V
2.9 Rated Power, kW
2.10 Working Voltage, V
2.11 Working Temperature, ℃
2.12 Maximum Temperature, (℃)
2.13 Simulated Conditions
2.14 Permissible Repair
2.15 Recovery
2.16 Damage
3 Product Classification
3.1 Variety and Specification
3.2 Type
3.3 Main Parameters
4 Technical Requirements
4.1 Design Requirements
4.2 Manufacture Requirements
4.3 Performance Requirements
5 Test Methods
5.1 General Requirements
5.2 Lead-Out Rod Tensile Test (Article 4.2.2)
5.3 Seal Test (Article 4.1.5.5)
5.4 X-Ray Examination
5.5 Temperature Rise Time Measurement (Article 4.3.1)
5.6 Rated Power Measurement (Article 4.3.2)
5.7 Leakage Current Measurement (Article 4.3.3)
5.8 Insulation Resistance Measurement (Article 4.3.4)
5.9 Insulation Voltage Withstand Test (Article 4.3.5)
5.10 On-and-off Power Test (see of this standard 4.3.6)
5.11 Overload Test (see 4.3.7 of this standard)
5.12 Heat Resistance Test (see 4.3.8 of this standard)
6 Inspection Rules
6.1 Acceptance Method
6.2 Delivery Inspection
6.3 Type Inspection
6.4 Miscellaneous
7 Marking, Packaging, Transportation and Storage
8 Order and Supply
