JB/T 8856-2018Dissolved acetylene systems (English PDF)

3.1 yield

under normal operating conditions, including loading and deslagging time, the average acetylene yield per hour of an acetylene generator within a working cycle not less than 8 h

3.2 deflagration

after decomposition or combustion of acetylene, the flame formed propagates to the unreacted gas side at a speed lower than the sound speed

Note: The pressure produced by acetylene deflagration can reach 9 ~ 11 times of the initial pressure.

3.3 detonation

the flame formed during decomposition or combustion of acetylene continues to propagate to the unreacted gas side at a speed higher than the sound speed (sometimes several times the sound speed)

Note: The pressure after detonation can be dozens of times or more than the initial pressure.

3.4 maximum allowable pressure

after considering the factors of acetylene deflagration, the maximum pressure (strength test pressure) that the system can withstand specified in the design of dissolved acetylene system

3.5 maximum allowable operating pressure

maximum allowable pressure of dissolved acetylene system during normal operation

3.6 piping

acetylene piping connected inside each unit of dissolved acetylene systems

Note: Acetylene piping includes blow off pipe, safety discharge pipe and cooling pipe of system, excluding acetylene piping connected between system and plant room.

3.7 design working life

when designing dissolved acetylene system, the working life shall be determined according to the corrosion rate of medium to materials and relevant factors

4.1 Pressure grading

The operating pressure of each system in the dissolved acetylene systems is divided into three grades:

-- Low pressure: less than or equal to 0.02 MPa;

-- Medium pressure: greater than 0.02 MPa and less than or equal to 0.15 MPa;

-- High pressure: greater than 0.15 MPa and less than or equal to 2.5 MPa.

4.2 Product classification

Dissolved acetylene systems can be divided into two types (low pressure and medium pressure) according to different maximum allowable operating pressures of acetylene generator:

-- Low pressure dissolved acetylene systems: the maximum allowable operating pressure of acetylene generator is 0.02 MPa;

-- Medium pressure dissolved acetylene systems: the operating pressure of acetylene generator is greater than 0.02 MPa, and the maximum allowable operating pressure is 0.15 MPa.

5.1 Performance indexes

The performance index of acetylene dissolving system shall be as specified in Table 1.