Heat Exchangers

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Presentation Description

Engr. Gulfam Raza Haidery

Comments

By: gulfamrazahaider (46 month(s) ago)

Hey, all! I've made it public. I think now you can download the ppt without any trouble.

By: caspian_mehr (64 month(s) ago)

pls. send me the presentation to my mail caspian_mehr@yahoo.com many thanks

By: Majed1133 (72 month(s) ago)

this is wonderful presentation !! i will be very happy if you Mr.Gulfam send it to me please to my E-mail K0-k1@hotmail.com

By: qusroo (73 month(s) ago)

Pls. mail ur ppt bhai. at qusrooATgmail.com

By: michael64401 (77 month(s) ago)

Good Day,pls.. send me your Heat Exchanger presentation cuz its a very nice one, thanks...novalmichael@gmail.com

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Presentation Transcript

PowerPoint Presentation:

INTRODUCTION TO HEAT EXCHANGER

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POINTS OF DISCUSSION INTRODUCTION CONSTRUCTION TYPES TYPES ACCORDING TO TEMA MAINTENANCE NDT FOR EXCHANGERS

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WHAT IS HEAT EXCHANGER The equipment or arrangement made to transfer heat between hot and cold streams through a combined conduction-convection mechanism is called Heat Exchanger. DEFINITION

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HEAT EXCHANGER - CLASSIFICATION A - TRANSFER PROCESS B - FLOW ARRANGEMENT C - GEOMETRY OF CONSTRUCTION Direct Contact Indirect Contact Parallel Flow Counter Flow Cross Flow Tubular Plate Type Extended Surface

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TUBULAR HEAT EXCHANGER

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PLATE TYPE HEAT EXCHANGER

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FINNED HEAT EXCHANGER

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CLASSIFICATION – BASED ON GEOMETRY HE PLATE TYPE TUBULAR EXTENDED SURFACE TUBE FINNED PLATE FINNED DOUBLE PIPE SHELL & TUBE SPIRAL TUBE FIXED TUBE FLOATING HEAD U - TUBE GASKETED WELDED

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BASIC COMPONENTS - EXTERNAL FEATURES Front Channel Head Shell Rear Channel Head Nozzle: Tube Side Flow Nozzle: Shell Side Flow Bellow (Expansion Joint) Gasket Vent Drain

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BASIC COMPONENTS - INTERNAL FEATURES Baffle Plates Sliding Rod Dummy Tube Front Tube Sheet Rear Tube Sheet Tubes Impingement Plates Tie Rods & Spacer Partition Plate

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PARTITION PLATES

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BOX TYPE PARTITION PLATE

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VAPOR BELT USED TO DISTRIBUTE FLUID EVENLY ROUND TUBE BUNDLE

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VAPOR BELT

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CLASIFICATION - TUBULAR HEAT EXCHANGER SHELL & TUBE FIXED TUBE FLOATING HEAD U - TUBE

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FIXED TUBE SHEET Shell Shell Welded with Tubesheet Tubesheet - Tubesheet Welded with the Shell - Tube-Bundle is not Removable - Tubes Secured at Both Ends (with 02 Tubesheet) - Channel Cover may be Removable

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FIXED TUBE SHEET - Non-fouling Fluids at Shell Side - Fluids with no Permissible Leakage APPLICATIONS - Low Cost - Maximum Protection Against Shell side Leakage ADVANTAGES - Shell Side is not Accessible for Cleaning or Inspection - Expansion Joint is Required to Relive Thermal Stresses DISADVANTAGES

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FLOATING-HEAD TUBE SHEET Shell Fixed Tubesheet Floating Tubesheet Gasket Gland Packing O – Ring Lantern Ring - One Tubesheet is Free to Move - Tubes Secured at Both Ends (with 02 Tubesheet) - Tube-Bundle is Removable

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- Fouling Fluids at Both Side - Large Temperature Difference b/w Shell & Tube Side Fluids APPLICATIONS - Easy Cleaning and Inspection - No thermal Stress Generation ADVANTAGES - High Cost - Cannot be Used where Leakage cannot be Tolerated DISADVANTAGES FLOATING-HEAD TUBE SHEET

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U-TUBE BUNDLE Shell Tubesheet Gasket - Tube-Bundle is Removable - Tubes Secured at One Ends (with 01 Tubesheet)

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- Fouling Fluids at Shell Side - Large Temperature Difference b/w Shell & Tube Side Fluids APPLICATIONS - Difficult Tube Cleaning - Tube Replacement is Difficult (Except Outer Tubes) DISADVANTAGES U-TUBE BUNDLE - Least Expensive - No thermal Stress Generation ADVANTAGES - Tube-Bundle can be Easily Removable for Cleaning or Inspection

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KETTLE TYPE REBOILER Shell Tubesheet Gasket Condensate Inlet Condensate Oulet Steam Outlet

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HEAT EXCHANEGR SPECIFICATIONS TEMA SPECIFICATIONS Shell Dia. 12 450 B E M Shell Flow Arrangement Front Channel Head Design Rear Channel Head Design Tube Length TEMA = TUBULAR EXCHANGER MANUFACTURING ASSOCIATION

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FRONT HEAD ARRANGEMENT A B

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FRONT HEAD ARRANGEMENT C D

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SHELL SIDE FLOW ARRANGEMENT ONE – PASS SHELL E TWO – PASS SHELL WITH LONGITUDNAL BAFFLE F

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SHELL SIDE FLOW ARRANGEMENT SPLIT FLOW G DOUBLE SPLIT FLOW H

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SHELL SIDE FLOW ARRANGEMENT DIVIDED FLOW J KETTLE TYPE REBOILER K

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P – Outside Packed S – Floating Head with Split Ring T – Pull Through (Internal Head) W – Packed with Lantern Ring REAR HEAD DESIGN

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2 - Pass Flow Partition Plate TUBE SIDE FLOW ARRANGEMENT

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TUBE SIDE FLOW ARRANGEMENT 4 - Pass Flow

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BASIC COMPONENTS - INTERNAL FEATURES BAFFLES TUBE-TUBESHEET JOINT TUBES LAYOUT

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BAFFLES - Used to Support Tubes - Creates Turbulence (Hence Enhance Heat Transfer) - Increases Stay Time of Fluid SALIENT FEATURES - Increases Pressure Drop - Creates Stagnant Point for Mud/Dirt - Creates Operational Problem DISADVANTAGES

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BAFFLES TYPES Horizontal Segmental Baffles Vertical Segmental Baffles

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BAFFLES TYPES Disk & Donut Baffles Impingement Baffles

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BAFFLES TYPES Longitudinal Baffles

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BAFFLES TYPES Rod Baffles

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ROD BAFFLES

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ROD BAFFLES

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BAFFLES TYPES Helical Baffles

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TUBE - TUBESHEET JOINT EXPANSION WELDING

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TUBE - TUBESHEET JOINT EXPANSION

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TUBESHEET LAYOUT 30 0 60 0 90 0 45 0 Inline Triangular Triangular Inline Square Diamond

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HEAT EXCHANGER MAINTENANCE - Cleaning - Testing ROUTINE MAINTENANCE - Repair - General Inspection

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HEAT EXCHANGER INSPECTION - Gasket and sealing faces condition GENERAL CHECKS - Bolts condition - Condition of channel head, shell etc. - Pass partition

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HEAT EXCHANGER INSPECTION - Corrosion TUBESHEET CONDITION - Ligament cracking

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HEAT EXCHANGER INSPECTION TUBE CONDITION Erosion and corrosion

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HEAT EXCHANGER INSPECTION TUBE CONDITION Tube ends thinning and corrosion

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HEAT EXCHANGER INSPECTION TUBE CONDITION Tube-Baffle clearance Deposits of scale and foulants

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HEAT EXCHANGER INSPECTION Bowed tubes indicating excessive thermal expansion TUBE CONDITION External tube erosion

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HEAT EXCHANGER CLEANING 1 – Deposition of Sand, Clay, Mud 2 - Scaling 3 - Corrosion WHY HEAT EXCHANGERS NEED CLEANING?

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HEAT EXCHANGER CLEANING 1 - Chemical Cleaning 2 - Mechanical Cleaning 3 - High Pressure Jetting ON-LINE CLEANING OFF-LINE CLEANING

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ON-LINE CLEANING CW Inlet CW Outlet Ball Collector

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ON-LINE CLEANING

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OFF-LINE CLEANING - Usually produces better results than mechanical cleaning - Most convenient technique (disassembly not required) CHEMICAL CLEANING - Can be used for soft materials - Expensive - Environment Hazard - Chemicals used in FFC: a - SalphamicAcid b - Armohib-31 c - Soda Ash

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OFF-LINE CLEANING - Following tools are used for cleaning exchanger mechanically; - Following exchanger cannot be cleaned; MECHANICAL CLEANING a – Flat, flexible metallic strips b – Nylon brushes (for soft tube materials) c - Rods d – Wire brushes a – Shell side of fixed-tubesheet units b – U-tube units with small radii c – Bundles with small tube spacing (less than 6.5 mm)

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OFF-LINE CLEANING - Usually produces better results than mechanical cleaning - Convenient technique (bundle pulling not required) HIGH PRESSURE JETTING CLEANING - Can be used for soft materials - Less material loss than chemical cleaning - No environment Hazard

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HEAT EXCHANGER TESTING Hydraulic Test Static Head Test Pneumatic Test - Pressure Test - Leak Test Helium Leak Test (Not Discussed) Ammonia Test

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FLOW ARRANGEMENT Counter Flow Parallel Flow Cross Flow

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TUBULAR EXCHANGER TYPES Double Pipe Spiral Tube

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DIRECT CONTACT HEAT EXCHANGER

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SPIRAL TUBE HEAT EXCHANGER

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DOUBLE PIPE HEAT EXCHANGER

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PLATE TYPE HEAT EXCHANGER

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