GB/T 3836.5-2021Explosive atmospheres - Part 5: Equipment protection by pressurized enclosure 'p' (English PDF)

National Standard of the People's Republic of China

ICS

29.260.20

Classification

K35

Issued by: State Administration for Market Regulation, China National Standardization Administration

Contents

• 1 Scope
• 2 Normative references
• 3 Terms and definitions
• 4 Protection level
• 5 Structural requirements for positive pressure enclosures
• 6 Temperature limit
• 7 Safety measures and safety devices (except static positive pressure protection)
• 8 Safety measures and safety devices for static positive pressure
• 9 Supply of protective gas
• 10 Positive pressure housing with internal release source
• 11 Release conditions
• 12 Design requirements for built-in systems
• 13 Shielding gas with internal release source and positive pressure technology
• 14 Equipment capable of igniting
• 15 Internal hot surface
• 16 Type inspection and test
• 17 Routine test
• 19 Operating Instructions
• 1 Scope
• 2 Normative references
• 5 Structural requirements for positive pressure enclosures
• 5.1 Housing
• 5.2 Material
• 5.3 Doors and covers
• 5.3.1 Type I positive pressure enclosure
• 5.3.2 Class I positive pressure enclosure with static positive pressure protection
• 5.3.3 Type Ⅱ positive pressure enclosure
• 5.3.4 Positive pressure enclosures of category Ⅱ and Ⅲ with static positive pressure protection
• 5.3.5 Type Ⅱ and Ⅲ. pxb type
• 5.3.6 Warnings for Class Ⅱ and Ⅲ Doors and Covers
• 5.4 Mechanical strength
• 5.5 Class Ⅰ and Ⅱ pores, partitions, partitions and internal components
• 5.5.1 The arrangement of air holes and partitions shall ensure effective ventilation.
• 5.5.3 Cathode ray tubes (CRTs) and other airtight devices do not require ventilation.
• 5.6 Air holes of the static positive pressure protection enclosure
• 5.7 Insulation material
• 5.8 Seal
• 5.9 Spark and particle baffle
• 5.10 Batteries and battery packs
• 6 Temperature limit
• 6.1 General
• 6.2 For "pxb" or "pyb" protection level
• 6.3 For "pzc" protection level
• 7 Safety measures and safety devices (except static positive pressure protection)
• 7.1 Applicability of safety devices in hazardous locations
• 7.2 Integrity of safety devices
• 7.4.3 Positive pressure system with "pxb" protection level
• 7.6 Safety device ratings
• 7.7 Automatic ventilation of positive pressure enclosures of "pxb" protection class Ⅰ and Ⅱ
• 7.8 Ventilation requirements for positive pressure enclosures of type Ⅰ or type Ⅱ
• 7.9 Cleaning of Type Ⅲ Positive Pressure Shell
• 7.10 Requirements at the lowest flow rate
• 7.11 Safety device for detecting the lowest positive pressure
• 7.12 Minimum positive pressure value
• 7.13 Positive pressure protection of multiple enclosures
• 7.14 Safety device on door or cover
• 7.15 Equipment that may be live
• 7.16 Equipment allowed in enclosures with "pyb" protection class
• 8 Safety measures and safety devices for static positive pressure
• 8.1 Applicability of safety devices for hazardous locations
• 8.2 Shielding gas
• 8.3 Internal release source
• 8.4 Inflation procedure for type Ⅰ and type Ⅱ positive pressure enclosures
• 8.5 Inflation procedure for type Ⅲ positive pressure enclosure
• 8.6 Safety device
• 8.7 Equipment that may be live
• 8.8 Positive pressure
• 9 Supply of protective gas
• 9.1 Spare supply
• 9.2 Independent supply
• 9.3 Shielding gas type
• 9.4 Temperature
• 10 Positive pressure housing with internal release source
• 11 Release conditions
• 11.1 No release
• 11.1.1 When there is no fault in the built-in system, there is no internal release, see 12.2.
• 11.2 Limited release of gas or vapor
• 11.3 Limited release of liquids
• 12 Design requirements for built-in systems
• 12.1 General design requirements
• 12.2 Trouble-free built-in system
• 12.3 Built-in system with limited release
• 13 Shielding gas and positive pressure technology with internal release source
• 13.1 General