英文版的水压试验.doc

Procedure
Doc. No.
DBP/QAP-1101
Hydrostatic Test Control
Rev. No.
0
Page:
4 of 4

Hydrostatic Test Control Procedure

□　　Controlled
□　　Uncontrolled

0

Initial issue

Rev No.
Rev. Date
Rev. Description
Prepared by
Reviewed by
Approved by

Dalian Deep Blue Pump Co., Ltd.

1. Purpose
This procedure is to control the process of hydrostatic test and provide hydrostatic test sequence and requirements making the hydrostatic test conform to requirements of ASME Section Ⅲ, Division 1, NB and QA Manual (DBP/NQA-SC-10)

2. Scope
This procedure is applicable to all the pressure retaining items, appurtenance and material to be hydrostatic tested.

3. Terms
3.1 Hydrostatic test: apply test pressure to the item under prescribed condition.水
3.2 Holding time: the time of hydrostatic test pressure maintained

4. Responsibility
4.1 Technical department shall be responsible for preparing of hydrostatic test instruction and designing of test clamping fixture.
4.2 Fabrication department shall be responsible for preparing technical requirements , performing hydrostatic test in accordance with requirements of drawing, Technical Procedure, traveler and instructions and recording test results on the test report.
4.3 QA Department
a) organize to train, examine and qualify the hydrostatic test operator and examiner.
b) analyze the test water and record the water analysis results on the analysis report.
c) supervise and notice customer and ANI to come for witness.

5. Pre-work of hydrostatic test
5.1 The pressure gauge shall be indicating pressure gauge and be connected to the item to be tested directly. The pressure gauge shall be installed on the position easy to watch in accordance with technical requirements.
5.2 Indicating pressure gauge
a) analog type indicating pressure gage used in testing shall be graduated over a range not less than 1.5 times nor more than 4 times the test pressure. It is best to select 2 times test pressure.
b) digital pressure gauge may be also used without range restriction provided the combined error due to calibration and readability does not exceed 1% of the test pressure..
5.3 Calibrate all the pressure gages against standard dead weight tester or a calibrated master gage. All the pressure gauges shall be calibrated before each test or series test. A series of test is that group of tests using the same pressure test gage or gages which is conducted at the same site within a period not exceeding 2 weeks.
5.4 Perform the hydrostatic test after all the inspections finished. For the item need to be heat treatment, perform the hydrostatic test after heat treatment.
5.5 The hydrostatic test operator shall be trained and familiar with materials related to item to be tested.( such as, drawing and requirements about hydrostatic test operation)
5.6 The examiner shall be qualified to verify the pump, piping, valve, pressure gage and clamping fixture used in test.
5.7 The test equipment shall be examined before pressure is applied to ensure that it is tight and that all low pressure filling lines and other items that should not be subjected to the test have been disconnected or isolated.

6. Hydrostatic test
6.1 The test medium shall be water or other liquid permitted by Design Specification. The test medium temperature shall conform to requirements of drawing or instruction.
6.2 Inject the test medium after the tested item being discharged air to the lest content.
6.3 The test pressure, holding time and acceptance criteria shall conform to requirements of drawing or customer documents.
6.4 Increase the test pressure slowly to 0.8 times test pressure to check test equipment, each area and pressure value, and then increase the pressure to test pressure if no leakage or abnormal phenomena.
6.5 Keep on venting of the test area to prevent overpressure resulting from abnormal test medium temperature increasing during holding time.
6.6 The holding time shall conform to requirements of technical and drawing. Check the pressure within prescribed time to ensure the pressure stable.
6.7 Examination for leakage after application of pressure
a) holding the test pressure at least 10 min before examining leakage.
b) examine the leakage under test pressure with the witness of ANI
c) the test operator shall not be absent from his position during hydrostatic test.

7. After hydrostatic test
a) the hydrostatic test operator shall dry the item with clean compressed air or nitrogen after hydrostatic test.
b) the test result shall be recorded on 《 Hydrostatic Test Report》by hydrostatic test operator, signed by examiner and reviewed by ANI..

8. Record
Hydrostatic Test Report( Exhibit 11-1 )