API 6D:2009 pdf download
API 6D:2009 pdf download.Specification for Pipeline Valves.
10 Quality control
10.1 NDE requirements
Any purchaser specified NDE requirements shall be selected from the list in accordance with Annex A. Final
NDE activities shall be conducted after heat treatment unless otherwise agreed.
10.2 Measuring and test equipment
10.2.1 General
Measuring and test equipment shall be identified, controlled and calibrated at intervals specified in the manufacturer’s instructions.
10.2.2 Dimension-measuring equipment
Dimension-measuring equipment shall be controlled and calibrated in accordance with methods specified in documented procedures.
10.2.3 Pressure-measuring devices
10.2.3.1 Type and accuracy
Test pressure measuring devices shall be either pressure gauges or pressure transducers that are accurate to within ± 2,0 % of the full-scale reading.
10.2.3.2 Gauge range
Pressure measurements shall be made between 25 % and 75 % of the full pressure range of the measuring device.
10.2.3.3 Calibration procedure
Pressure-measuring devices shall be periodically recalibrated with a master pressure-measuring device or a dead-weight tester at 25 %, 50 % and 75 % of the full pressure scale.
10.2.4 Temperature-measuring devices
Temperature-measuring devices shall be capable of indicating and recording temperature fluctuations of 5 °C (8 °F).
10.3 Qualification of inspection and test personnel
10.3.1 NDE personnel
NDE personnel shall be qualified in accordance with the requirements specified in ISO 9712 or
ASNT SNT-TC-IA.
Personnel performing visual examinations shall have passed an annual eye examination in accordance with ISO 9712 or ASNT SNT-TC-IA within the previous twelve months.
Personnel performing visual inspection of welding operations and completed welds shall be qualified and certified to the requirements of AWS QC1, or equivalent, or a manufacturer’s documented training programme.
10.4 NDEof repairs
After defect removal, the excavated area shall be examined by magnetic-particle (MT) or liquid-penetrant (PT) methods in accordance with Annex A. Repair welds on pressure-containing parts shall be examined using the same NDE method that was used to detect the defect with a minimum of MT or PT. Acceptance criteria shall be as specified in Annex A for the appropriate product form. The final NDE activities shall be conducted after post weld heat treatment unless otherwise agreed.
The NDE requirements specified by the purchaser in 10.1 shall also apply to repair welding.
10.5 Weld end NDE
If the purchaser specifies that weld ends be subjected to volumetric or surface NDE, the examination and
acceptance criteria shall be in accordance with Clause A.22.
10.6 Visual inspection of castings
All castings as a minimum shall be visually inspected in accordance with MSS SP-55.
11 Pressure testing
11.1 General
Each valve shall be tested prior to shipment. The purchaser shall specify which particular supplementary tests in Annex B shall be performed.
Testing shall be performed in the sequence detailed in 11.2 to 11.5. Pressure testing shall be carried out before coating of the valves.
If the valve has been previously tested in accordance with this International Standard, subsequent repeat testing may be performed without removal of the valve external coating.
Test fluid shall be fresh water or, by agreement, light-weight oil having a viscosity not exceeding that of water.
Water shall contain a corrosion inhibitor and, by agreement, antifreeze. The chloride content of test water in
contact with austenitic and duplex stainless steel wetted components of valves shall not exceed
30 pg/g (30 ppm by mass).
Valves shall be tested with the seating and sealing surfaces free from sealant except where the sealant is the primary means of sealing. A secondary sealant system, if provided, shall not be used before or during tests.
Tests specified with the valve half-open may also be performed with the valve fully open, provided the body cavity is simultaneously filled and pressurized through a cavity connection.
If valve-body connections are not available for direct monitoring, methods for monitoring pressures and/or leakage shall be determined.
Supply pressure shall be stabilized prior to the start of pressure testing and shall be held for the minimum test durations listed in Tables 9, 10 and 11.
Pressure testing shall be performed in accordance with documented procedures.
