Australian New Zealand Standard AS / NZS Pipelines – Gas and Liquid Petroleum – Field Pressure Testing – Western Australia. AS – , Field Pressure Testing, Revision committed formed, Expected AS – , Safety Management Studies, With. AS/NZS Accessed by CITIC PACIFIC MINING PTY LTD on 03 Dec AS/NZS Australian/New Zealand Standard?.
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The accuracy requirement is sufficient to determine the temperature-pressure response at the prevailing average pipe temperature. An example draft calculation for jet A1 liquid for p?
The values in Table 5. If 22885.5 test section contains more than one leak, each of the multiple leaks must therefore be smaller and less important, since the aggregate is that for a single leak.
When a pipeline test section is pressurized or depressurized, energy is added to, or released from, the test section. L Calculated pressure loss due to observed leak A The presence of leakage can be determined by holding the test pressure at a fixed pressure 28885.5 few percent below the end-point pressure.
The hole diameter can be determined and product loss can be estimated. Continue pressurization until the end-point is reached. It is rare for a leak test to be conducted in conditions that are fully stabilized, so a very careful examination of temperature trends at each measuring point is essential.
Provision is made for the graph to be plotted at about the size of a small drawing board and it is specified that readable units az provided on each axis up to SMYS. Units shall be converted to SI units before any rounding. The effects of any surge pressure on the safety of the filling operation shall be taken into account.
Pipe temperature measuring points may be located on the surface of the pipe, or the surface of the pipe coating. The combined effect of residual stresses and Bauschinger effect on a flattened test piece may lead to 288.55 underestimation or overestimation of the true hoop yield stress properties. The test liquid may contain corrosion inhibitors or other appropriate additives.
AS Pipelines-Gas and liquid petroleum – Field pressure testing_图文_百度文库
Procedures for cleaning and filling the test 2885. The statement shall be signed by the supervising test engineer. No allowance is made for changes in hole size due to elasticity of the steel at different pressures. During pressurization, besides the heating of the ax due to adiabatic compression there will be a small drop in temperature of the steel due to.
Temperature readings should be taken over a period, to ensure that the system has reached thermal stability. This 28855. describes two methods of residual air determination as follows: An assessment of the possibility of longitudinal or circumferential expansion due to pressure causing damage to the pipe coating. This premature end-point may result from a number of causes, and the Standard requires that a procedure be followed to investigate it. Unlike the hold pressure for the pressurecontrolled test, the hold pressure for the yield test is not known in advance of the test but is determined during the test from the actual behaviour of the test section in situ.
SCOPE OF ACCREDITATION
The time taken for stabilization to occur depends on the temperature of the test liquid at the time of filling, specific heat capacity of the test liquid, pipe diameter, burial depth, undisturbed ground temperature and the thermal conductivity of the backfill and ground, which can be affected by ground water.
When this methodology is used, the added volume equivalent to the strain at the yield strength of the pipe material for all those pipes that will yield defined in API 5 L as 0.
Unless significant lengths of the test section have been pressured well above the SMYS pressure see Paragraph E5a premature end-point is likely to indicate substantial quantities of under-strength pipe in the test section.
B1 4 Where an unrestrained pipeline or system of pipes includes pipe of different diameters, Equation B2 becomes—?
Before commissioning or recommissioning of a pipeline, field pressure tests are specified in AS Serious instrument error is most likely to be the result of an error in volume measurement, since instruments for pressure measurement are easily verified against a pressure gauge or recorder and errors of the magnitude required to produce a premature end-point would be immediately apparent.
G-frame, compressive end plates, on line pipe? Other methods may be used. The maximum practicable length may also be limited by considerations of placement of and access to temperature probes, the collection of data by manual, remote or automated means, and travel times within the specified measurement time intervals.
In the absence of any better information, the qs stress may be taken as zero.
If leakage 2885., then Clause 4. This Standard also provides additional information on a number of subjects, which would assist the experienced and competent person in the preparation of the test program and the assessment of the test, and would contribute to the understanding of the testing of pipelines by approving authorities, owners, designers, and contractors.