Asme Section Viii Division-1 2po13

WHAT IS PRESSURE VESSEL?  PRESSURE VESSELS ARE CONTAINERS FOR THE CONTAINMENT OF PRESSURE, EITHER INTERNAL OR EXTERNAL.THIS PRESSURE MAY BE OBTAINED FROM AN EXTERNAL SOURCE, OR BY THE APPLICATION OF HEAT FROM A DIRECT OR INDIRECT SOURCES.

SCOPE  THIS DIVISION CONTAINS MANDATORY REQUIREMENTS, SPECIFIC PROHIBITION, AND NONMANDATORY GUIDANCE FOR PRESSURE VESSEL MATERIALS, DESIGN, FABRICATION, EXAMINATION, INSPECTION, TESTING, CERTIFICATION, AND PRESSURE RELIEF .  ENGINEERING JUDGEMENT MUST BE CONSISTENT WITH THE PHILOSOPHY OF THIS DIVISION, AND SUCH JUDGEMENTS MUST NEVER BE USED TO OVERRULE MANDATORY REQUIREMENTS OR SPECIFIC PROHIBITIONS OF THIS DIVISION.

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SUBSECTION A: GENERAL REQUIREMENTS

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SUBSECTION B: REQUIREMENTS PERTAINING TO METHODS OF FABRICn PV

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SUBSECTION C: REQUIREMENTS PERTAINING TO CLASSES OF MATERIAL

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PART UHX

: RULES FOR SHELL AND TUBE HEAT EXCHANGERS.

DESIGN GENERAL 1. MINIMUM THICKNESS OF PRESSURE RETAINING COMPONENTS:  THE MINIMUM THICKNESS PERMITTED FOR SHELLS AND HEADS, AFTER FORMING AND REGARDLESS OF PRODUCT FORM AND MATERIAL,SHELL BE 1/16 IN.(1.5 mm).EXCLUSIVE OF ANY CORROSION ALLOWANCES.  THE MINIMUM THICKNESS OF SHELLS AND HEADS OF UNFIRED STEAM BOILERS SHELL BE ¼ IN.(6 mm).  THE MINIMUM THICKNESS OF SHELLS AND HEADS USED IN COMPRESSED AIR SERVICE, STEAM SERVICE, AND WATER SERVICE SHALL BE 3/32 IN.(2.5 mm) EXCLUSIVE OF ANY CORROSION ALLOWANCE.

CONTINUE 1. WHAT IS MILL UNDERTOLERANCE? 2. WHAT IS PIPIE UNDERTOLERANCE? 3. WHAT IS CORROSION ALLOWNCE? 4. WHAT IS COMBINATION UNIT? 5. COMMON ELEMENT DESIGN

DESIGN DESIGN TEMPERATURE 1. MAXIMUM DESIGN TEMPERATURE:  THE MAXIMUM TEMPERATURE USED IN DESIGN SHALL BE NOT LESS THAN THE MEAN METAL TEMPERATURE EXPECTED UNDER OPERATIING CONDITIONS.

2. MINIMUM DESIGN TEMPERATURE:  THE MINIMUM TEMPERATURE USED IN DESIGN SHALL BE THE LOWEST EXPECTED IN THE SERVICE.  DESIGN TEMPERATURE IS NO WARMER THAN 345*C NOR COLDER THAN -29*C.

DESIGN PRESSURE  EACH ELEMENT OF A PRESSURE VESSEL SHALL BE DESIGN FOR AT LEAST THE MOST SEVERE CONDITION OF COINCIDENT PRESSURE AND TEMPERATURE EXPECTED IN NORMAL OPERATION.

DESIGN THICKNESS OF SHELL S UNDER INTERNAL PRESSURE  THE SYMBOLS DEFINED BELOW ARE USED IN THE FORMULAS

E =T EFFICIENCY P = INTERNAL DESIGN PRESSURE R = INSIDE RADIUS OF THE SHELL COURSE UNDER CONSIDERATION S = MAXIMUM ALLOWABLE STRESS VALUE t = MINIMUM REQUIRED THICKNESS OF SHELL

CONTINUE 1. FOR CYLINDRICAL SHELLS  IN CASE OF CIRCUMFERENTIAL STRESS (LONGITUDINAL TS) WHEN t<=0.5R ,

P<=0.385SE  IN CASE OF LONGITUDINAL STRESS (CIRCUMFERENTIAL TS) WHEN t<=0.5R , P<=1.25SE 2. FOR SPHERICAL SHELLS WHEN t<=0.356R , P<=0.665SE

DESIGN 

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THICKNESS OF SHELLS AND TUBES UNDER EXTERNAL PRESSURE RULES FOR THE DESIGN OF SHELLS AND TUBES UNDER EXTER-NAL PRESSURE GIVEN IN THIS DIVISION ARE LIMITED TO CYLINDRICAL SHELLS, WITH OR WITHOUT STIFFENING RINGS, TUBES, AND SPHERICAL SHELLS. THE SYMBOLS DEFINED BELOW ARE USED IN THE FORMULAS A = FACTOR DETERMINED FROM FIG. G IN SUBPART 3 OF SECTION II, PART D AND USED TO ENTER THE APPLICABLE MATERIAL CHART IN SUBPART 3 OF SECTION II, PART D. FOR THE CASE OF CYLINDERS HAVING Do /T VALUES LESS THAN 10. B = FACTOR DETERMINED FROM THE APPLICABLE MATERIAL CHART OR TABLE IN SUBPART 3 OF SECTION II, PART D FOR MAXIMUM DESIGN METAL TEMPERATURE Do=OUTSIDE DIAMETER OF CYLINDRICAL SHELL COURSE OR TUBE E =MODULUS OF ELASTICITY OF MATERIAL AT DESIGN TEMPERATURE. THE MODULUS OF ELASTICITY TO BE USED SHALL BE TAKEN FROM THE APPLICABLE MATERIALS CHART IN SUBPART 3 OF SECTION II, PART D.

CONTINUE L=DESIGN LENGTH OF A VESSEL SECTION BETWEEN LINES OF P =EXTERNAL DESIGN PRESSURE

Pa= CALCULATED VALUE OF MAXIMUM ALLOWABLE EXTERNAL WORKING PRESSURE FOR THE ASSUMED VALUE OF t Ro=OUTSIDE RADIUS OF SPHERICAL SHELL t=MINIMUM REQUIRED THICKNESS OF CYLINDRICAL SHELL OR TUBE, OR SPHERICAL SHELL, IN. (MM) ts=NOMINAL THICKNESS OF CYLINDRICAL SHELL OR TUBE,IN. (MM)