不銹鋼通風管道壓力試驗條件有哪些？

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1、 管道進行壓力試驗應具備的條件

1. Conditions for pressure test of pipeline

① 施工完畢的管道，必須通過安裝確認，有管道加工記錄并符合設計要求和GBJ235-82中有關規定；

① The pipeline after construction must be confirmed by installation, have pipeline processing records and meet the design requirements and relevant provisions in gbj235-82;

② 規定的支、吊架安裝完畢，并已調節完畢管道的傾斜度；

② The specified supports and hangers have been installed and the inclination of the pipeline has been adjusted;

③ 焊接工作已經結束，經檢查合格并有檢驗記錄，焊接部位未做保溫處理；

③ The welding work has been completed, passed the inspection and there are inspection records, and the welding parts have not been insulated;

④ 管子與管道附件具有完整的制造廠家的合格證書，并有閥門的試驗記錄，試驗用壓力表和溫度計也必須是經過檢驗的合格產品；

④ Pipes and pipe accessories shall have complete manufacturer's certificate of conformity and valve test records. Pressure gauges and thermometers for test must also be qualified products after inspection;

西安通風管道加工

Xi'an ventilation pipe processing

⑤ 試驗用的壓力表已經校驗，精度不得低于1.5級。表面的滿刻度值為 大被測壓力的1.5~2倍，壓力表不得少于2個，以便比較；

⑤ The pressure gauge used for the test has been calibrated, and the accuracy shall not be lower than grade 1.5. The full scale value of the surface shall be 1.5 ~ 2 times of the measured pressure, and there shall be no less than 2 pressure gauges for comparison;

⑥ 有檢驗 的并經過批準的試驗方案；

⑥ There is an inspected and approved test scheme;

⑦ 設計修改及材料變更代用應有文件；

⑦ Design modification and material change substitution shall be documented;

⑧ 試驗前應將不能參加試驗的系統、設備、儀表及管道附件等加以隔離。

⑧ Before the test, the systems, equipment, instruments and pipe accessories that cannot participate in the test shall be isolated.

2、水壓試驗的操作

2. Operation of hydrostatic test

使用清潔的水作為試壓介質。向管內灌水時，應打開管道系統中高點的閥門排氣，待水灌滿后，關閉排氣閥和進水閥，用手搖式水泵或電動水泵加壓，壓力逐漸地升高直到設計試壓的某一數值。然后停止加壓時對管道進行檢查，無泄漏等問題后現繼續加壓，試驗壓力時停止加壓，并保持20min。

Use clean water as the pressure test medium. When filling the pipe, open the valve at the high point in the pipeline system for exhaust. After the water is filled, close the exhaust valve and inlet valve, pressurize with hand-operated water pump or electric water pump, and gradually increase the pressure until a certain value of the design pressure test. Then, check the pipeline when the pressurization is stopped. After there is no leakage and other problems, continue the pressurization. When the test pressure is reached, stop the pressurization and keep it for 20min.

在試驗壓力下保持的時間內，如果管道未發生異常現象，壓力表指針不下降，則水壓試。然后把壓力降工作壓力進行嚴密性試驗。在工作壓力之下對管道進行 的檢查，同時使用1.5kg以下的木錘在距焊縫10~20mm處輕輕敲擊，到檢查完畢，如壓力表指針沒有下降或下降不超過0.02MPa，此時管道上焊縫也未出現滲漏現象，即為合格。

If there is no abnormality in the pipeline and the pointer of the pressure gauge does not drop within the holding time under the test pressure, the hydrostatic test shall be carried out. Then reduce the pressure to the working pressure for tightness test. For the inspection of the pipeline under the working pressure, at the same time, use a wooden hammer less than 1.5kg to knock gently at the place 10 ~ 20mm away from the weld. After the inspection, if the pointer of the pressure gauge does not drop or the drop does not exceed 0.02MPa, and there is no leakage on the weld on the pipeline, it is qualified.