阀门脱脂方法

阀门脱脂方法

1、清洗步骤:

阀门的零部件在组装前必须经过以下过程处理：

1、根据加工要求，部分零部件需要做抛光处理，表面不能有加工毛刺等；

2、所有零部件进行脱脂处理；

3、脱脂完成后进行酸洗钝化，清洗剂不含磷；

4、酸洗钝化后用纯净水冲洗干净，不能有药剂残留，碳钢部件省去此步骤；

5、逐个零部件用无妨棉进行擦干，不能有线毛等留存部件表面，或者用洁净的氮气进行吹干；

6、用无纺布或者精密滤纸沾分析纯酒精对逐个零部件进行擦拭，直至没有脏色。

2、 装配要求

清洗干净的部件必须密封保存，以供安装。对安装过程要求如下：

1、安装车间必须保证洁净，或者搭建临时的洁净区域，例如用新购的彩条布或者塑料薄膜等，防止在安装过程中有灰尘进入。

2、装配工人必须身着洁净的纯棉工作服，头戴纯棉帽，头发不能外漏，脚穿干净鞋子，手戴塑胶手套，脱脂。

3、装配用工具必须在装配前进行脱脂清洗，保证洁净。

3、 其他要求

1、装配完成的阀门用氮气至少吹扫1分钟。

2、气密试验必须是用纯净的氮气。

3、气密试验合格后进行包封，用干净聚乙烯帽密封，聚乙烯帽使用前应用有机溶剂浸泡，擦拭干净。

4、然后用真空袋进行密封。

5、发货前装箱。

6、运输过程中要采取措施保证包封不破损。

4、 验收要求

验收遵循HG 20202-2000 《脱脂工程施工及验收规范》，装配前每个零部件均用干净的精密滤纸进行擦拭，选择部件死角、，滤纸不变颜色为合格

 

Valve degreasing method

 

1. Cleaning steps:

 

The parts of the valve must go through the following process before assembly:

 

1, according to the processing requirements, some parts need to be polished, the surface can not have processing burrs;

 

2. Degreasing of all parts;

 

3, degreasing after the completion of pickling passivation, cleaning agent does not contain phosphorus;

 

4. Rinse with pure water after pickling passivation, and there can be no pharmaceutical residue. This step is omitted for carbon steel parts.

 

5. Wipe the parts one by one with harmless cotton, do not retain the surface of the parts such as wire wool, or blow dry them with clean nitrogen;

 

6, with non-woven cloth or precision filter paper with analysis of pure alcohol to wipe each part until there is no dirty color.

 

2. Assembly requirements

 

Clean parts must be sealed and stored for installation. Requirements for the installation process are as follows:

 

1. The installation workshop must ensure cleanliness, or build a temporary clean area, such as the newly purchased color strip cloth or plastic film, to prevent dust from entering the installation process.

 

2, the assembly workers must wear clean cotton work clothes, wear a pure cotton cap, hair can not leak out, wear clean shoes, wear plastic gloves, degreasing.

 

3. Assembly tools must be degreased and cleaned before assembly to ensure cleanliness.

 

3. Other requirements

 

1. The assembled valve shall be purged with nitrogen for at least 1 minute.

 

2. The air tightness test must be pure nitrogen.

 

3. After passing the air tightness test, go ahead and seal it with a clean polyethylene cap. The polyethylene cap should be soaked in organic solvent and wiped clean before use.

 

4. Then seal it with a vacuum bag.

 

5, finally packing.

 

6. Measures should be taken to ensure that the packaging is not damaged in the process of transportation.

 

4. Acceptance requirements

 

The acceptance shall follow HG 20202-2000 Code for Construction and Acceptance of Defatting Engineering. Before assembly, each part shall be wiped with clean precision filter paper. If the dead corner of the part is selected, the color of the filter paper remains unchanged, it is qualified