陈老轨专栏|船上氧气乙炔系统的维护保养检查

氧气乙炔维护保养检查

OCIMF SIRE 2.0石油公司检查CHAPTER 10.3 Machinery safetymanagement　其中提到对船上氧气乙炔系统的维护保养检查

系统的维护检查要求由三部分组成：　每次使用前检查、年检、５年更换或翻新。

首先要阐明氧气乙炔系统的每年检查是可以由船上轮机长检查试验并作出证明记录，包括对软管、各接头螺纹是否损坏泄漏的检查、以及对调压阀，阻焰器、焊割枪功能试验。见查阅ＢＧＣＡ下表

很多对这个英文术语的regulator CREEP TEST在本专业上存在相关操作上的误解。查阅DREW或ＵＮＩＴＯＲ供应商的建议并对此做出解释，以引导我们船上实践操作。

What is Creep test?

Regulator creep test is a phenomenon inwhich delivery pressure rises above the setpoint and occurs two ways:　调压阀的压力渐变功能试验是排出压力上升到大于设定点并会发生以下两种现象

·      Change to the motion of theregulator springs when gas flow is stopped

当气体无流动时，变成调压阀的弹簧运动

·      Foreign material becominglodged between the poppet and seat, preventing tight shut off.

外来物嵌入提升或落座之间　防止关闭太紧。

Creep test procedure:

Isolate the downstream side of the gas regulator by closing theregulator outlet valve, instrument valve or process isolation valve, close theregulator by turning the adjustment knob counterclockwise until it reaches stopor rotates freely. Slowly turn on the gas supply. When the regulator inletgauge registers full cylinder delivery pressure, shut off the gas supply. Turnthe regulator adjusting knob clockwise until delivery pressure gas readsapproximately half of scale (I e 50psi on a 100psi guage) close the gasregulator by turning adjustment knob counterclockwise until the it rotatefreely or reaches the stop. Note the reading on delivery pressure gauge. Wait15mins and recheck the setting on the delivery pressure gauge. If any rise indelivery pressure is detected during this time, the regulator is defective.Remove and replace. In order to prevent costly damaged to a gas delivery systemand the instrumentation it serves, care must be taken to ensure the regulatorconnection are capped to protect against ingress of dirt or foreign material.Tubing should also be flushed or blown clean to remove any foreign matter. Apressure relief valve should be installed downstream of the gas regulator as anadditional protection against creep.

·      为防止系统及在使用的仪表在测试中损坏，须把调压阀接头盖上保护盖，防止有异物或脏物进入，管路也吹除干净，最好也在调压阀出口装上一安全释放阀作为调压功能试验的附加保护。

1.      关闭调压阀下游的出口阀、仪表阀，逆时针旋转调压阀的调整旋钮直到旋钮不能转或自由旋转，（全关状态）

2.      慢慢打开气瓶供气阀，当调压阀进口压力与气瓶的出口压力一致，关闭气瓶供气阀。

3.      顺时针旋转调压阀的调整旋钮使调压阀出口压力达到出口压力表的半量程，现在再逆时针旋转调压阀的调节旋钮到不能旋转或自由旋转。

4.      记录下调压阀的出口表读数，等待15分钟，再检查出口压力表读数，如果读数升高，表明该调压阀泄漏故障，该调压阀需更换。希望此解释有所帮助，谢谢！更多操作使用指南详情请查阅BCGA code及厂家的建议。

来源：陈子辉轮机长