KSB boiler feed water pump HGC commissioning field case
一、服务背景Service Background
四台HGC3/9 安装及调试指导
4 HGC3/9 installation and commissioning guidance
现场位号：高压给水A/B/C/D泵，下图为A泵铭牌：
Site Tag No.: high-pressure water supply A/B/C/D pump, the following figure shows the nameplate of pump A:
二、服务内容Service Content
1，调试前，检查冷却水系统，润滑油添加情况，检查有无漏点，查看水泵电机对中数据，检查电机空转方向。
Before debugging, check the cooling water system, lubricating oil addition, check whether there is a leakage point, check the motor alignment data of the pump, and check the motor idling direction.
2，2022年9月15号晚上调试B泵，几分钟之内入口压力下降过快，出口压力过低，立刻停泵安排检查入口滤网。照片如下：
On the night of 2022 September 15th, the B pump was adjusted. Within a few minutes, the inlet pressure dropped too fast and the outlet pressure was too low. Here are the photos:
3，滤网阻塞严重，原因有二
2）滤网目数过高，约估有120目（图1），次日协助电建安装队，改造将120目滤芯去掉，改成40目（图2）滤芯滤网。
The mesh size of the filter was too high, about 120 mesh (Figure 1). The next day, I assisted the power construction and installation team to remove the filter element of 120 mesh and change it to 40 mesh (Figure 2)
4，出口管路旁路至除氧器，旁路管路设计过大（DN80，下图1/2黑色箭头指向为旁路），也暂未安装节流孔板，导致出口旁路流量过大，当使用节流阀控制小流量时，流体通过阀门噪音很大，业主担心对阀门有冲击，造成阀门过早磨损，遂未能安排泵通过旁路连续运转4小时，大约运转10分钟，从25Hz逐步加速到40Hz（图3为转速35Hz进出口压力），查看出口压力、水泵振动（小于1mm/s,远低于4.5mm/s的标准)，遂和业主、客户沟通后，次日正常使用给水泵补水锅炉。
Export line bypass to the deaerator, bypass piping design is too large (DN80, below 1/2 black arrow pointing to bypass), also temporarily not installed the throttling orifice plate, lead to export the bypass flow is too large, when using small throttle control flow, flow through the valve noise is very big, owners worry has impact to the valve, causing premature valve wear and tear, As a result, the pump could not be arranged to run continuously for 4 hours through the bypass, running for about 10 minutes, gradually accelerating from 25Hz to 40Hz (Figure 3 shows the inlet and outlet pressure at 35Hz speed). After checking the outlet pressure and pump vibration (less than 1mm/s, far below the standard of 4.5mm/s), the pump was normally used to refill the boiler the next day after communicating with the owner and customer.
三、建议项Advice & Suggestion
水泵油位计以及轴承箱上定位螺丝处，不适合安装在有淋雨可能的室外，存在进水渗水可能，请在轴承室上方安装遮雨设施。（图1上黑色扎带仅为演示排气孔是对上方通的）。有的油位计已经进水，都已经被排干水，重新加油。（图2所示为水在油位的下方）
The oil level gauge of the water pump and the positioning screw on the bearing box are not suitable to be installed outdoors where there is a possibility of rain and water seepage. Please install rain shielding facilities above the bearing room. (The black cable tie in Figure 1 is only to demonstrate that the exhaust hole is open to the top). Some of the oil level meters have been flooded, have been drained, refuel. (Figure 2 shows the water below the oil level)
