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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This envelope is generally available for a plain pipe, Figure 2. The factored stress for fitting is: The induced loads due to a thermal expansion for any above ground piping system may be calculated; however, because of the low elasticity modulus values of Isi pipes, the expansion resulting from internal pressure can sometimes be equal in magnitude to thermal expansion.
This factor could be derived from table 2 and 3 of ISO The hoop stress due to internal pressure may be calculated as: The deflection at mid-span due to dead weight may be determined as: It is designed to jso every economic sector and virtually every activity of the humankind where technical standards may be used.
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14629-3 We recommend that you check the website of the publishers of the international document before making a purchase. This is defined in accordance with following equation: Tees and joints have a similar design envelop, Figure 5 .
System criticality and failure risk assessment. 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. Finally, please be aware that ISO standards have recently been revised in or The following equation may be used to determine the allowable hoop stress. At the highest point of a pipe cross section the axial stress may be calculated as: Manufacturer shall always provide the value of.
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In ISO the qualified stress is defined as: By substituting equations 4647 and 49 in equation In the design of GRP piping systems, these expansions should be controlled by the following approaches: The mean temperature change of a pipe wall may be calculated as: Just for reference, you may have a look at this older post: A geometrical proof of equation 44 could be ieo as follows, see figure 4.
However, in such case, the analysis is likely much more complicated and time consuming. A combination of axial stresses due to internal pressure and total general axial stress, should be calculated and evaluated by equation Hello, Regarding applicalbe code for GRP pipie design and stress analysis, I ordered vendor to apply below code.
The equivalent stress for fittings could be determined as: According to figure 3, with assuming: Thermally induced loads due to a maximum operating or ambient temperature range could be evaluated.
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 1692-3 be evaluated and finally compared with the corresponding allowable stresses and loads respectively. Magnitude of temperature changes. The supports are flexible, for example they include an elastomeric pad.
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The buckling stress to maximum compressive axial stress ratio shall be greater than 3. The 114692-3 material is isotropic The supports are flexible, for example they include an elastomeric pad. The factored stress for a plain pipe could be determined as: For filament-wound bends, r is less than 1; but for hand lay-up bends, the r is greater than 1.
The fact is that ISO standard provisions regarding pipe stress analysis are based on the Design Stress Envelope which defines the allowable stress system. Dave Diehl Member Registered: Previous Topic Index Next Topic.
In ISO 146922-3, two design envelop have been defined based on available measure data as follows. 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. It is important to us that you purchase the right document. Piping stress engineer should evaluate the total piping system in order to specify any need of flexibility analysis.
In the following, the methods for evaluation of the mentioned loads, 146923- deflections and their allowable conditions are discussed. For both pipe and joints, the long-term design envelop is rectangular, as shown in figure 5. At the lowest point of the pipe cross section the axial stress may be calculated as: About 10 years ago I passed through such experience. 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.
Therefore, the equivalent Euler buckling stress is: For definition isi system load cases 146923- as sustained, expansion and occasional load cases, the ASME B The idealized long-term envelop could be determined as: In table 1, acceptance criteria for different load cases, based on ISOare suggested. If Manufacturer is not able to provide all the relevant parameters of the Design Stress Envelope, then BS employment isk stress analysis purpose might be a solution.
Controlling with expansion loops. Suggested acceptance criteria based on ISO