API SPEC 19LH pdf download Liner Hanger Equipment
h) hold-down capacity;i) torque capacity.
The design shall take into account the effects of pressure containment and pressure-induced loads, including forcesand loads induced during the running and setting of the system.
Internal connections shall meet or limit the performance rating of the product or system in which the internalconnection is used.
Design verification shall be performed using documented procedures to ensure that each productsystem designmeets the supplier/manufacturer’s technical specifications and shall include activities such as design reviews, designcalculations, physical tests,comparison with similar designs and historical records of defined operating conditions.
Verification results shall be reviewed and approved by a qualified person and records of the review shall become aportion of the design documentation (see 7.2).
6.4.2 Design Analysis
The equipment shall be analyzed to determine the performance limits. The performance limits of the assembly shallbe determined by the component of the design with the highest stress factor (or strain factor for plastically deformedcomponents).The design shall consider all operational loading conditions defined in the functional specification. Oneof the design analysis methods in 220.127.116.11 shall be used to determine the maximum state of stress of a component.Once the method is selected, it becomes the requirement.
The supplier/manufacturer shall identify the Type 1 components of the product or system and the mode of loading.The supplier/manufacturer shall calculate the stress level (and strain level for plastically deformed components) in theidentified component(s) based upon the worst-case loads in the design requirements.
In the determination of ratings, the minimum acceptable material condition and minimum acceptable material yieldshall be used in the calculations. The calculations shall include consideration of the effects of temperature. Tests bythe supplier/manufacturer shall be conducted in accordance with ASTM E21 or ISO 6892-2 for yield strength andASTM E111 for modulus of elasticity. Other equivalent national or international standards may be used.Metalmechanical properties derating shall be in accordance with one or more of the following:
industry recognized published data reviewed and verified by a qualified person;data provided by the material supplier;
-data used by the supplier/manufacturer.18.104.22.168 Design Analysis Methods
22.214.171.124.1Distortion Energy Theory
The distortion energy theory, also known as the von Mises yield criterion, may be used for design calculations forpressure-containing components.
NOTE The distorton energy theory predicts a combined stress that will exceed the materialls minimum yield strength; this isalso commonly known as von Mises stress. This theory determines a combined stress at a point from the given principal stresses.The vonMises stress predicts failure when the total amount of distortion in a differential cube of material is equivalent to thedistortion experienced by the same cube when loaded by a uniaxial force to the yield point.
Rules for the consideration of discontinuities and stress concentrations are beyond the scope of this method and thisspecification. However, the basic pressure vessel wall thickness may be sized by combining triaxial stresses basedon hydrostatic test pressure and limited by the following criterion:
Spis the maximum allowable equivalent stress at the most highly stressed distance into the pressure vessel
wall, computed by the distortion energy theory method;
Sy is the material-specified minimum yield strength.
126.96.36.199.2Triaxial Yield and Collapse Equations
API 5C3 provides equations that may be used to derive the triaxial yield and collapse of a cylinder.
188.8.131.52.3 Finite Element Analysis
Finite element analysis (FEA) is a design verification methodology that may be used to predict equipmentperformance for complex geometry andlor complex loading where conventional verification methodologies areconsidered incomplete by the design engineer.
NOTE An example FEA method for analyzing a pressure-containing component is described in Annex D.184.108.40.206.4SupplierlManufacturer Defined Analysis
Supplier/manufacturer defined analysis may be used for design calculations for pressure-containing components.
6.4.3Rated Performance Envelope
Arated performance envelope as specified in 6.7 shall be prepared for systems validated to VS1 or vS2.
For validation grade VS3, a rated performance envelope shall be prepared when requested in the functionalspecification.
Materials for each component shall be stated by the supplier/manufacturer and shall be suitable for the environmentalconditions specified in the functional specification. The supplier/manufacturer shall have documented specificationsfor all materials, and materials shall comply with these specifications.
a) The user/purchaser may specify materials for the specific use and corrosion environment in the functional
specification. If the supplier/manufacturer proposes to use another material, the userlpurchaser has the option toaccept or reject the proposed material alternative.This applies to metallic and nonmetallic components.