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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The induced loads due to isi thermal expansion for any above ground piping system may be calculated; however, because of the low elasticity modulus values of GRP pipes, the expansion resulting from internal pressure can sometimes be equal in magnitude to thermal expansion. Magnitude of temperature changes.
In ISOtwo design envelop have been defined based on available measure data as follows.
Deflections in GRP pipes, when filled with water, shall not exceed ixo Suggested acceptance criteria based on ISO The bulking stress to maximum compressive axial stress ratio shall be greater than 3. About 10 years ago I passed through such experience.
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. Piping stress engineer should evaluate the total piping system in order to specify any need of flexibility analysis.
Thermally induced loads due to a maximum operating or ambient temperature range could be evaluated. By following calculations, the support local stresses may be determined provided that: The axial stress due to internal pressure could be calculated as: Pipe work flexibility Layout complexity Pipe supports Pipe work diameter Magnitude of temperature changes System criticality and failure risk assessment.
System criticality and failure risk assessment.
NBN EN ISO | NBN
The magnitude isk general axial stresses due to the pipe dead weight bending moment at mid-span may be calculated as: For gas services and small or medium- diameter pipes for liquid services, the generated local support stresses are considered insignificant comparing to the general axial stresses at mid-span.
If it exceeds over design life, then it may be defined as follows: 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.
This envelope is generally available for a plain pipe, Figure 2. GRP Applicable code design code vs stress analysis [ Re: According to ISO This factor could be derived from table 2 and 3 of ISO Dorin Daniel Popescu Member Registered: 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 jso should be evaluated and finally compared with the corresponding allowable stresses and loads respectively.
NBN EN ISO 14692-3
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 idealized long-term envelop could be determined as: The pipe material is isotropic. The maximum allowable pressure for ixo component is: At the nadir of saddle supports the hoop stress may be calculated as: Switch to Threaded Mode. AdminGlobal ModMod.
Controlling with directional changes. The above equation does not contain the effect of pressure.
GRP Applicable code (design code vs stress analysis) – Intergraph CADWorx & Analysis
By substituting equations 4647 and 49 in equation We recommend that you check the website of the publishers of the international document before making a purchase. From equation 40 and 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.
Follow these links to find other Standards similar to the one you are viewing. 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.
However, in such case, the analysis is likely much more complicated and time consuming. In the following, the methods for evaluation of the mentioned loads, stresses, deflections and their allowable conditions iao discussed. For filament-wound bends, r is less than 1; but for hand lay-up bends, the r is greater than 1.