NEMA SMpdf. October 25, | Author: marsulex | Category: Steam, Turbine, Valve, Consensus Decision Making, Copyright. SM (R, R). Steam Turbines for Mechanical Drive Service. Published by: National Electrical Manufacturers Association. North 17th Street. NEMA SMpdf - Download as PDF File .pdf), Text File .txt) or read online.
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NEMA SMpdf - Download as PDF File .pdf), Text File .txt) or read online. NEMA SM NEMA SM Steam Turbines for Mechanical Drive Service. Secure PDF Published By: National Electrical Manufacturers Association (NEMA); Page. handle external piping forces and moments. Although NEMA. SM 23 () or API Standard () have been conventionally referred to for allowable loads.
What is the purpose of providing Graphite Pads in supports below shoes?
Answer : To reduce the friction factor. The co-efficient of friction for Graphite Pads is 0. How is piping to Tank inlet nozzle is supported and why? What are the two types of flexible spring hangers? Constant Spring and 2. Variable Spring Ans: Variables use coiled springs to support a load and allow movement. The resistance of the coil to a load changes during compression, which is why these devices are called "variables".
Constant Spring Hanger provides constant support force for pipes and equipment subjected to vertical movement due to thermal expansion at locations where maintaining a constant stress is critical. This constant resistance is achieved by having two moment arms pivoted about a common point.
FIL shall be defined as per Section 4. Wind loads will be implemented in horizontal axis, X or Z, whichever is more stringent. Wind profile will be considered as wind velocity vs. The maximum wind speed of 80 kmlhr, taken frorn Process Basis of Design document no. Seismic Loads The piping system shall be designed to withstand seisniic loads and no failure identified. The recommended vertical design spectra shall be taken as of the llorizontal design spectra.
Seismic loads are considered based on Zone 2 it1 SNI For stress stiffening due to pressure, operating pressure? Sempec lndoriesia - I T. Page 11 of 37 7. However, ASME In case use of design temperatures results in major revision in piping IayouVsupporting then in consultation with Process Department, maximum or minimum operating temperatures can be used for stress analysis. To reduce frictional loads on equipment nozzles or to reduce frictional forces at welded supports where local stresses exceed allowable stresses, use of low friction sliding plates may be considered at supports.
Based on the pairing of contact surfaces following frictional factors shall be used: 0. These shall include equipment nozzle thermal growth, tank seltlements, differential settlement between structures, thermal growth of Vendor interface piping, the lines displacements of other stress anaiysis calculation notes, etc.
If possible, when analyzing piping around equipment with thermal growth displacements or settlements, pipe rigid support should be modeled connecting to equipment structure.
Spring supports are considered as rigid support during hydro test case. On the field, these spring supports shall be locked to prevent excessive deflection and over-. However, Vendor datas will be used later upon receipt. Sernpcc Indonesia - Ir1. Page 12 o f 37 Operating condition 3: pump A stand-by, pump B operating For piping systems with portions of stagnant fluid and without hot by-pass the temperature gradient along the piping length shall be considered as per following: For insulated lines, average ground temperature from block valve to the equipment.
For un-insulated lines, average ground temperature from tee junction to the equipment 8. Number or actual operating cycles shall be obtained from the Process Department c The allowable stress due to occasional loads such as wind, earthquake, PSV reaction forces, etc.
ASME B These occasional loads shall not be considered to act concurrently.
Page 13 o f 37 In cases where the total pressure exceed the allowable pressure, a second verification shall be performed at the maximum operating conditions or a detailed flange calculations shall be carried out as per requirements of Section Vlll Div. Allowable Loads o n Equipment Nozzles Forces and moments induced by piping system on nozzles of major equipment shall not exceed the values stated in the various standards mentioned below. For piping connected to strain sensitivelrotating equipments, the nozzle loads calculation shall be based on operating temperature.
For all other nozzle loads, calculation shall be based on design temperature. Air fin cooler shall be considered as strain sensitive equipment. Vessels, Columns, and Heat Exchangers Piping loads applied at the shell-nozzle junction shall not exceed the criteria set in Appendix C. In case the loads are exceeded, then a WRC checking shall be carried out to check the magnitude of local stresses due to piping loads. Subsequently, the loads shall be submitted to the Mechanical Department for onward transmission to the Vendor for approval.
For welded plate frame and plate heat exchangers, the allowable loads at nozzles shall be as per Table-I of API For shell and tube heat exchangers, the allowable piping loads at nozzles shall be as per the table specified in Appendix C. Mechanical Department shall obtain confirmation from Piping Department for the allowable loads provided by Vendor. Reciprocating Compressors Supplier shall provide maxiinurn individcial and resultant allowable forces and moments of both inlet and outlet nozzles.
Flat-Sided Tanks Unless agreed with downloadr, the allowable nozzle loads lor ll:il.. Storage Tanks The minimum allowable external loads on tanks shc? Il operiings shall I?
Scmpoc lndoncsia -I T Pilnj Lloyd lndoncsin..
Exceptions to this shall be approved by the stress engineer. Pipe lateral deflections should not be excessive as to cause clashing with surrounding pipe work, structural or equipment. Stress engineer shall mark pipe horizontal displacements mm on the stress isometrics for providing longer shoe lengths and checking of pipe spacing clearance by piping designer. A combined thermal flexibility and water hammerlsurge analysis shall be performed by Vendor. Detailed piping design by Contractor shall follow recotnmendations made by Vendor.
The maximum load variation for piping cocinected to other c? Constant spring supports shall be selected in either of tlie following cases: The load variation exceeds the above specified limits To reduce the transfer of load to nozzles on fragile equipment 0.
However, the working range of selected spring nlotlel sliall also be suitable for vertical displacement at design temperattrrc?. When used on liquid lines a WNC Wei ghl No Conterits checking shall be c;:lrried out to ensure that the equipment nozzles are not overloadeti, or the pipe is no1 overslressetl wlien the pipe is empty. Sornpec Indonesia - 1'.
Page 15 of 37 9. In case piping layout constraints do not permit addition of flexibility by means of providing loops, etc. For piping systems utilizing expansion joints, recommendations of EJMA standard shall be followed.
Load case report Restraint loads Spring design data if required Code compliance report Sample of stress calculation note refer to Appendix G. I'ucJ Lloyd lndoilesia I'unj l. Punj Lloyd 1ndonc:;i;i - I'uiU Iloyii i. Page I?
Allalysis , bycompany -,;-. NOTES: 1. Sempec Indonesia - PT.
Punj Lloyd 1ndonesi;r. I'ullj l. Page 18 of 37 3. PSV reaction forces shall be considered for gaslvapour lines only. Underground Fire Water metallic piping shall be exempted from formal stress analysis and shall be assigned Lines Category 1. Large reciprocating equipment if any which requires dynamic analysis for induced vibration shall be covered by a separate study done by a Specialist Consultant.
The following lines do not need to be stress analyzed: Non-hydrocarbon lines such as air lines and water lines including potable water, service water,. All lines which discharge directly to atmosphere and which are not subjected to large thermal.
All lines which are part of skid mounted packages i. All drain systems piping including open drain and closed drain systems. Sempec Indonesia - I 3 T j l. Page 20 o f 37 Approximate Methods for Simplified Analysis 1. Do not use for lines ending in tees. Expansion length must be taken from fixed point. Seilnpec Indonesia - l'i. I'ilnj Lloyrl Illdonosin - i'ilnj Lloyil l l d Cotj! Sempec Indonesia IPT.
Unless otherwise specified, the maximum allowable forces and moments shall be as per table below. These forces and moments are assumed to be acting at the intersection of the vessel and nozzle.
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