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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Loading cases that should be employed are likely different than those for B 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. The magnitude of general axial stresses due to the pipe dead weight bending moment at mid-span may be calculated as: Manufacturer shall always provide the value of.
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. By 1469-23 equations 4647 and 49 in equation Controlling with bellows units. Controlling with directional changes. At the highest point of a pipe cross section the axial stress is be calculated as: The fact is that ISO standard provisions regarding pipe stress analysis are based on the Design Stress Envelope which defines the allowable stress system.
NBN EN ISO | NBN
The following equations are developed: Deflections in GRP pipes, when filled with water, shall not exceed Print Topic Switch to Threaded Mode. 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. System design This document has been re-assessed by the committee, and judged to still be up to date.
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: The bulking stress to maximum compressive axial stress ratio shall be greater than 3.
If you intend to proceed to stress analysis following ISOyou need to read the latest edition in order to be able to ask isoo Manufacturer all the applicable input parameters. Dave Diehl Member Registered: Pipe work flexibility Layout complexity Pipe supports Pipe work diameter Magnitude of temperature changes System criticality and failure risk assessment.
A geometrical proof of equation 44 could be referred as follows, see figure 4. The factored stress for fitting is: 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 1492-3 be evaluated and finally compared with the corresponding allowable stresses and loads respectively.
BS EN ISO 14692-3:2017
The qualified stresses for fitting could be calculated as: Switch to Threaded Mode. The factored stress for a plain pipe could be determined as: Follow these links to find other Standards similar to the one you are viewing. However, in such case, the analysis is likely much more complicated and time consuming.
If Manufacturer is not able to provide all the relevant parameters of the Design Stress Envelope, then BS employment for stress analysis purpose might be a solution.
Hello, Regarding applicalbe code for GRP pipie design and stress analysis, I ordered vendor to apply below code.
NBN EN ISO 14692-3
The pipe material is isotropic. We recommend 146992-3 you check the website of the publishers of the international document before making a purchase. The above equation does not contain the effect of pressure. According to ISO You are not logged in. In ISO the qualified stress is defined as: The total general axial stress resulting from internal pressure and bending moment of self mass or dead weight at the bottom and top of the pipe is: The following equation may be used to determine the allowable hoop stress.
From equation 40 and Piping stress engineer should evaluate the total piping system in order to specify any need of flexibility analysis.
GRP Applicable code design code vs stress analysis [ Re: From equation 33 and The buckling stress to maximum compressive axial stress ratio shall be greater than 3.
For gas services and small or medium- diameter pipes for liquid services, the generated local 1469-3 stresses are considered insignificant comparing to the general axial stresses at mid-span. This method is more conservative isk the fully measured envelop method and may be used for both plain pipe and other components, Figure 3.
The idealized long-term envelop could be determined as: The above equations do not include effect of internal pressure.