An exchanger may still be considered as meeting TEMA requirements as long as the exception is documented. For kettle reboilers the nominal diameter shall be the port diameter followed by the shell diameter, each rounded off to the nearest integer.
Tube length for straight tubes shall be taken as the actual overall length. For U-tubes the length shall be taken as the approximate straight length from end of tube to bend tangent. SIZE N-l. Typrcal parts and connections, for illustrative purposes only, are numbered for identfficatfon in Table N Stationary Head-Channel Stationary Head-Bonnet Floating Tubesheet Skirt 3. Stationa Head Flange-Channel or Bonnet Packing Box 4.
Packing 5. Stationary Head Nozzle Lantern Ring Tierods and Spacers 6. Shell Transverse Baffles or Support Plates 9. Shell Cover Impingement Plate Shell Flange-Stationary Head End Longitudinal Baffle Shell Flange-Rear Head End Pass Partition Shell Nozzle Vent Connection Shell Cover Flange Drain Connection Expansion Joint Instrument Connection Floating Tubesheet Support Saddle Floating Head Cover Lifting Lug Floating Head Backing Device Split Shear Ring Liquid Level Connection Slip-on Backing Flange Dimensions in are millimeters.
These tolerances may be adjusted as necessary to meet the tolerances shown in Figure F-l. Protrusions above the serrations are not permitted. Baffle is a device to direct the shell side fluid across the tubes for optimum heat transfer.
Baffle and Suooort Plate Tube Hole Clearance is the diametral difference between the nominal tube CD and the nominal tube hole diameter in the baffle or support plate. DoubleTubesheet Construction is a type of construction in which two 2 spaced tubesheets or equivalent are employed in lieu of the single tubesheet at one or both ends of the heat exchanger.
Effective Shell and Tube Side Desian Pressures are the resultant load values expressed as uniform pressures used in the determination of tubesheet thickness for fixed tubesheet heat exchangers and are functions of then shell side design pressure, the tube side design pressure, the equivalent differential expansion pressure and,..
Eauivalent Boltina Pressure is the pressure equivalent resulting from the effects of bolting loads imposed on tubesheets in a fixed tubesheet heat exchanger when the tubesheets are extended for bolting as flanged connections.
Eauivalent Differential Exoansion Pressure is the pressure equivalent resulting from the effect of tubesheet loadings in a fixed tubesheet heat exchanger imposed by the restraint of differential thermal expansion between shell and tubes.
Exoanded Tube Joint is the tube-to-tubesheet joint achieved by mechanical or explosive expansion of the tube into the tube hole in the tubesheet. Flanae Load Concentration Factors are factors used to compensate for the uneven application of bolting moments due to large bolt spacing. Normal Oaeratina Conditions of a shell and tube heat exchanger are the thermal and hydraulic performance requirements generally specified for sizing the heat exchanger. Pulsatino Fluid Conditions are conditions of flow generally characterized by rapid fluctuations in pressure and flow rate resulting from sources outside of the heat exchanger.
Seismic Loadings are forces and moments resulting in induced stresses on any member of a heat exchanger due to pulse mode or complex waveform accelerations to the heat exchanger, such as those resulting from earthquakes. Shell and Tube Mean Metal Temoeratures are the average metal temperatures through the shell and tube thicknesses integrated over the length of the heat exchanger for a given steady state operating condition. Shut-Down Conditions are the conditions of operation which exist from the time of steady state operating ,condftions to the time that flow of both process streams has ceased.
Tubesheet Liqament is the shortest distance between edge of adjacent tube holes in the tube pattern Welded Tube Joint is a tube-to-tubesheet joint where the tube is welded to the tubesheet.
Reference No. Propcwal No. In addition, the state and local codes applicable to the plant location must also be met. Heat exchanger design calculations. These parameters are determined based on some calculations. This is the third edition of this publication. Section approval of the standard does not necessarily imply that all section members voted for its approval or participated in its development. C This standard specifies requirements and gives recommendations for the mechanical design, material selection, fabrication, inspection, testing, and preparation for shipment of shell-and-tube heat exchangers for the petroleum, petrochemical, and natural gas industries.
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Are you looking for a way to quickly create heat exchanger drawings? A copy of the licensing agreement accompanies the software. Tubular Exchanger Manufacturers Association, Inc. The 9th Edition retains the useful data and features found in the Eighth Edition plus many clarifications and innovations.
Some noteworthy features of the Ninth Edition include:. New rules for flexible shell elements expansion joints , which are based on a Finite Element Analysis FEA approach Tables for tube hole drilling have been expanded to 3 diameter tubes Guidelines for performing Finite Element Analysis FEA had been added. Rules for the design of shell intersections with large nozzle to cylinder ratios subjected to pressure and external loadings have been added Foreign material cross-reference linking material specifications from various international codes has been added Rules for the design of longitudinal baffles have been added.
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