ISO 14692-3 PDF
ISO Petroleum and natural gas industries — Glass-reinforced plastics ( GRP) piping — Part 3: System design. ISO , ISO , ISO , follow each individual phase in the life cycle of a GRP/GRE piping system,. i.e. from design through manufacture to. BS EN ISO gives guidelines for the design of GRP piping systems. The requirements and recommendations apply to layout.
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Because of ovalization caused by a bending moment, the stress resulting from axial and bending loads is more complicated than plain pipe, therefore the shape of envelop highly depends on a lay-up configuration of the bend.
From equation 40 and At the lowest point of the pipe cross section the axial stress may be calculated as:. System criticality and failure risk assessment. The mass of GRP pipe is insignificant compared to the mass of liquid contents.
This method is more conservative than the fully measured envelop method and may be used for both plain pipe and other components, Figure 3.
By substituting equations 4647 and 49 in equation In table 1, acceptance criteria for different load cases, based on ISOare suggested.
The pipe material is isotropic. For definition of system load cases such as sustained, expansion and occasional load cases, the ASME B The qualified pressure, Pq is based on a design life of 20 years and determined by manufacturer based on the procedure described in sec 6.
NBN EN ISO 14692-3
If you need help with the purchase or have any queries please email enquiries standards. For stress analysis, different loading conditions such as internal or external pressure, thermal, occasional and support loadings should be determined, and then the related stresses and loads should be evaluated and finally compared with the corresponding allowable stresses and loads respectively.
System design This document has been re-assessed by the committee, and judged to still be up to date. A combination of axial stresses due to internal pressure and total general axial stress, should be calculated and evaluated by equation The above equations do not include effect of internal pressure.
It is important to us that you purchase the right document. From equation 33 and Piping stress engineer should evaluate the total piping system in order to specify any need of flexibility analysis. The requirements and recommendations apply to layout dimensions, hydraulic design, structural design, detailing, fire endurance, spread of fire and emissions and control of electrostatic discharge.
Pipelines – Gas and liquid petroleum – Design and construction You may be interested in this related standard Gas distribution networks You may be interested in this related standard.
NBN EN ISO | NBN
The equivalent stress for fittings could be determined as: For both pipe and joints, the long-term design envelop is rectangular, as shown in iiso 5. The factored stress for a plain pipe could be determined as: If you intend to proceed to stress analysis following ISOyou need to read the latest edition in order to be able to ask to Manufacturer all the applicable input parameters.
Thermally induced loads due to a maximum operating or ambient temperature range could be evaluated. The fact is that ISO standard provisions regarding pipe stress analysis are based on the Design Stress Envelope which defines the allowable stress system. We recommend that you check the website of the publishers of the international document before making a purchase. The bulking stress to maximum compressive axial stress ratio shall 16492-3 greater than 3.
Magnitude of temperature changes. This envelope is generally available for a plain pipe, Figure 2. This factor could be derived from table 2 and 3 of ISO The mean temperature change of a pipe wall may be calculated as: Due to the absence of a method for evaluation of these parameters in CAESAR II,some calculation sheets are presented in the calculation sheet section.
In the design of GRP piping systems, these expansions should be controlled by the following approaches: In ISOtwo design envelop have been defined based on available measure data as follows. At the saddle support horn the hoop stress may be calculated as: The factored qualified pressure is defined as a pressure which is used to determine a safe operating envelope of the GRP piping system, see section of this article: At the lowest point of the pipe cross section the axial stress may be calculated as: Controlling with directional changes.
calcstress | GRP
In order to maintain integrity of GRP process piping systems and pipelines, regarding following factors, the stress analysis should be performed to ensure that the system can sustain all stresses and deformations requirements. Previous Topic Index Next Topic.
Sustained and Operating stresses are to be qualified. Although we endeavour to maintain an up-to-date catalogue, on occasion we may not have the latest version of a document, including where it has not yet been provided through an international feed. Manufacturer shall always provide the value of.
The following equation may be used to determine the allowable hoop stress. Follow these iiso to find other Standards similar to the one you are viewing. Pipe work flexibility Layout complexity Pipe supports Pipe work diameter Magnitude of temperature changes System criticality and failure risk assessment.
The following equations are developed: The qualified stresses for fitting could be calculated as: The combination of local hoop stress and general hoop stress should be calculated and evaluated by equation 35 The buckling stress to the maximum compressive axial stress ratio shall be greater than 3. Dorin Daniel Popescu Member Registered: AdminGlobal ModMod. About 10 years ago I passed through such experience.