ASME Sec VIII Div 1

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Basics of ASME Section VIII Division 1 Pressure Vessels

Structure & Usage of The Code Book For BEGINNERS This guide is exclusively prepared for training purpose. Relevant specifications, codes & special requirements of specific project are to be referred for more detailed information during construction. Examples provided are only for the purpose of illustration. The objective is to be familiar with Basic / Fundamental concepts of the code.

N.Rajasekaran (RAJ) +971-50-6682960

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Need

Early Boiler

Room Heater

Result

Explosions

Death & Injuries

Corrective action

Committee ASME sponsor

ASME Code

Definitions: Specify

To State or Describe clearly and exactly.

Pressure Vessel

U-1(a)(2) For the scope of this Division, 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 source, or any combination thereof.

Construction

An all inclusive term comprising materials, design, fabrication, examination, inspection, testing, certification and pressure relief.

Mandatory

describes something which must be done, or which is demanded by law

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something

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

ASME American Society of Mechanical Engineers Code Books: New issuance every 3 Years Edition 2007:

White pages (loose-leaf format)

Addenda 2008:

Pink Pages (replacement)

Addenda 2009: Edition 2010:

Blue Pages (replacement) White pages ……..and so on

Contents: (1) Mandatory requirements, (2) Specific prohibitions (2) Non-mandatory guidance Interpretations: ASME’s written replies to inquiries concerning interpretation of technical aspects of the Code. Issued semi annually (July and Dec) as separate document. CODE CASES: Proposed additions and revisions to the Code. (to clarify the intent of existing requirements) or To provide rules not covered by existing Code.

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

.The

ASME Code Books

Sec I

Power Boilers Part A

Materials : Ferrous

Ref

Part B

Materials : Non Ferrous

Ref

Part C

Materials : Filler & Electrodes

Ref

Part D

Material Properties (US ) or (Metric)

Ref

Sec II

Sec III

Rules for Construction of Nuclear Facility Components

Sec IV

Heating Boilers

Sec V

Nondestructive Examination

Sec VI

Care and Operation of Heating Boilers

Sec VII

Care of Power Boilers

Sec VIII

Div 1

Pressure Vessels

Div 2

Alternative Rules - Pressure Vessels

Div 3

Alternative Rules – High Pressure Vessels

Sec IX

Welding and Brazing Qualifications

Sec X

Fiber-Reinforced Plastic Pressure Vessels

Sec XI

In-service Inspection of Nuclear Power Plant Components

Sec XII

Construction and Continued Service of Transport Tanks

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Ref

Ref

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

The Sec VIII Div 1 Code Book Foreword Statement of Policy Personnel Summary of Changes Introduction - U Sub section Classes of Materials

C

Sub section B Method of Fabrication

Sub section A General Requirements

Mandatory Appendix – Arabic Numerals

Non Mandatory Appendix – Alphabets S.I Units Index Total Pages 40+675 = 715 (incl. front back cover) Edition 2007

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Unfired Vessel:

U

General :

UG

Welding :

UW

Carbon Steel:

UCS

……..and so on Title 0mm

SCOPE U-1

4 mm

U-1(a)

7 mm

U-1(a)(1)

12 mm

(a)

15 mm

(1)

Numeric-(Alphabetic)-(Numeric) (Alphabetic) (Numeric) The Code does not address all aspects of these activities and those aspects which are not specifically addressed should not be considered prohibited. The Code is not a handbook and cannot replace education, experience, and the use of engineering judgment. The phrase engineering judgment refers to technical judgments made by knowledgeable designers experienced in the application of the Code. Engineering judgments must be consistent with Code philosophy and such judgments must never be used to overrule mandatory requirements or specific prohibitions of the Code.

The Code does not fully address tolerances. When dimensions, sizes, or other parameters are not specified with tolerances, the values of these parameters are considered nominal and allowable tolerances or local variances may be considered acceptable when based on engineering judgment and standard practices as determined by the designer.

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Vessel Scope by application: U-1(c)(2) Vessels not included

Listed U-1(c)(2) : (a) Thro (j)

Pressure below 3000 psi (in General)

Vessel scope by geometry: U-1(e) First girth weld (Circumferential joint)-by welding First threaded joint – for screwed connection Face of First Flange – by bolting Including covers – for Manholes

Code accepted Referenced editions : U-3 Units of measurement – U-4 (Code case 2523 )

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Sub Section A PART UG : General Requirements (Common for Sub section B and C) Materials

UG 4 - UG 15

Design Openings Stay Ligament Fabrication Inspection & Tests Marking & Reports Pr Relief Figures Tables

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Fill Here ! Excercise

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

70,000 PSI (70 KSI) SA Example: UTS

UTS SMYS

Metric516M Grade 485) 516 Grade 70 (SA

485 MPa (70 KSI) UTS

= 70,000 PSI = 38,000 PSI

S (allowable stress used in design for Temperature upto 500°F) = 20,000 PSI [Page 16 of Sec II Part D – U.S Customary] F.S

= 38 / 20 = 1.9

U-4: UNITS OF MEASUREMENT For any single equation, all variables shall be expressed in a single system of units. When separate equations are provided for U.S. Customary and SI units, those equations must be executed using variables in the units associated with the specific equation.

70,000 PSI 485 - 482.633 2.367 MPa

= 482.633 MPa = 2.367 = 343 PSI !!!

1 MPa = 145.0377 PSI Therefore Do not mix two system of units in calculations. Sec II Part D ( The stress values) is issued in two versions U.S Customary & Matric/S.I

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Basic approach of design

  

σa, sometimes called the longitudinal stress tangential stress, σt, also referred to as the hoop or circumferential stress radial stress, σr . . . all of which are taken to be positive tensile. axial stress,

Cylinders are usually considered to be either thick - in which stress concentration due to relative curvature is significant - or thin in which stress concentration is negligible. Other differences are :

Limiting proportions (approx) Analytic treatment Statically determinate Stress state Stress - radial, σr - tangential, σt - axial, σa

Thin

Thick

Di/t > 20

Di/t < 25

simple approximation yes membrane - ie. biaxial

accurate no

zero uniform uniform

triaxial varies with radius varies with radius uniform

The dividing line between thin and thick - is not hard and fast.

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

σc

=

p Di / 2 t (Circumferential Hoop stress acting on Long seam weld )

σl

=

p Di / 4 t (Longitudinal stress acting on cir seam weld)

Conclusion: Cir seam weld is TWICE stronger than Long seam weld when subjected to pressure. Therefore Long seams are Category A : Cir seams are Category B

Basic Formula : σc = p D / 2 t; therefore t = i

Code Formula: pressure

p Ri /

σc

t = (p R )/ (SE-0.6p) : σc = S = allowable stress i

= 250 PSI (p)

Radius (int) = 32 inch Stress allowable = 20,000 PSI (SA 516 Gr 70) Basic Formula

Code Formula

t= 0.4” (10.16 mm)

t= 0.403” (10.24 mm) if FULL RT (E=1.0) t= 0.475” (12.06 mm) if SPOT RT (E=0.85) t= 0.578” (14.67 mm) if NO RT (E=0.7)

UG-32:

FORMED HEADS, AND SECTIONS, PRESSURE ON CONCAVE SIDE

All formed heads concave to pressure and intended for butt welded attachment need not have an integral skirt when the thickness of the head is equal to or less than the thickness of the shell. When a skirt is provided, its thickness shall be at least that required for a seamless shell of the same inside diameter. Flat spot on head max allowable diameter UG-32 (o)  UG-34 Formula (1), C=0.25

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

UG-37:

REINFORCEMENT REQUIRED FOR OPENINGS IN SHELLS AND FORMED HEADS

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

UG-80:

PERMISSIBLE OUT-OF-ROUNDNESS OF CYLINDRICAL, CONICAL, AND SPHERICAL SHELLS

(Internal pressure)

UG-93:

INSPECTION OF MATERIALS

(a) Except as otherwise provided in UG-4(b), UG-10, UG-11, or UG-15, requirements for acceptance of materials furnished by the material manufacturer or material supplier in complete compliance with a material specification of Section II shall be as follows. (1) For plates,2 the vessel Manufacturer shall obtain the material test report or certificate of compliance as provided for in the material specification and the Inspector shall examine the Material Test Report or certificate of compliance and shall determine that it represents the material and meets the requirements of the material specification. (2) For all other product forms, the material shall be accepted as complying with the material specification if the material specification provides for the marking of each piece with the specification designation, including the grade, type, and class if applicable, and each piece is so marked. UG-99:

STANDARD HYDROSTATIC TEST

(g) Following the application of the hydrostatic test pressure, an inspection shall be made of all joints and connections. This inspection shall be made at a pressure not less than the test pressure divided by 1.3. Except for leakage that might occur at temporary test closures for those openings intended for welded connections, leakage is not allowed at the time of the required Page 13 of 27

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

visual inspection. Leakage from temporary seals shall be directed away so as to avoid masking leaks from other joints. Static head of water : 0.433 psi for every feet of height. UG-102:

TEST GAGES (b)

UG-116:

Dial indicating pressure gages used in testing shall be graduated over a range of about double the intended maximum test pressure, but in no case shall the range be less than 11⁄2 nor more than 4 times that pressure. Digital reading pressure gages having a wider range of pressure may be used provided the readings give the same or greater degree of accuracy as obtained with dial pressure gages.

REQUIRED MARKING

“

RT 1”

“

RT 2”

“

RT 3”

“

RT 4”

when all pressure-retaining butt welds, other than Category B and C butt welds associated with nozzles and communicating chambers that neither exceed NPS 10 (DN 250) nor 11⁄8 in. (29 mm) wall thickness [except as required by UHT-57(a)], satisfy the full radiography requirements of UW11(a) for their full length; full radiography of the above exempted Category B and C butt welds, if performed, may be recorded on the Manufacturer’s Data Report; or when the complete vessel satisfies the requirements of UW-11(a)(5) and when the spot radiography requirements of UW-11(a)(5)(b) have been applied; or when the complete vessel satisfies the spot radiography requirements of UW-11(b); or when only part of the complete vessel has satisfied the radiographic requirements of UW-11(a) or where none of the markings “RT 1,” “RT 2,” or “RT 3” are applicable.

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Sub Section B PART UW : Welding Requirements UW-2:

SERVICE RESTRICTIONS (a)

When vessels are to contain lethal1 substances, either liquid or gaseous, all butt welded joints shall be fully radiographed, except…….

UW-3:

WELDED JOINT CATEGORY

UW-11:

RADIOGRAPHIC AND ULTRASONIC EXAMINATION (a) (b) (c)

UW-12:

Full Radiography Spot Radiography. No Radiography

JOINT EFFICIENCIES Table UW-12

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

UW-33:

ALIGNMENT TOLERANCE Joint Categories

UW-51:

Thickness (mm)

A

B, C, & D

Up to 13, incl.

¼t

¼t

Over 13 to 19, incl.

3 mm

¼t

Over 19 to 38, incl.

3 mm

5 mm

Over 38 to 51, incl.

3 mm

⅛t

Over 51

Lesser of 1⁄16t or 10mm Lesser of ⅛ t or 19 mm

RADIOGRAPHIC EXAMINATION OF WELDED JOINTS (1)

any indication characterized as a crack or zone of incomplete fusion or penetration;

(2)

any other elongated indication on the radiograph which has length greater than: (a) 1⁄4 in. (6 mm) for t up to 3⁄4 in. (19 mm) (b) 1⁄3t for t from 3⁄4 in. (19 mm) to 21⁄4 in. (57 mm) (c) 3⁄4 in. (19 mm) for t over 21⁄4 in. (57 mm)

where t=

the thickness of the weld excluding any allowable reinforcement. For a butt weld joining two members having different thicknesses at the weld, t is the thinner of these two thicknesses. If a full penetration weld includes a fillet weld, the thickness of the throat of the fillet shall be included in t.

(3)

any group of aligned indications that have an aggregate length greater than t in a length of 12t, except when the distance between the successive imperfections exceeds 6L where L is the length of the longest imperfection in the group;

(4)

rounded indications in excess of that specified by the acceptance standards given in Appendix 4.

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

UW-52:

SPOT EXAMINATION OF WELDED JOINTS 1 spot in 50 feet RT (1) any indication characterized as a crack or zone of incomplete fusion or penetration; (2) Elongated > 2/3 t (thinner); ∑l >t in 6t …..; 19 max, 6 on any t.. (3) Rounded indications are not a factor in the acceptability of welds not required to be fully radiographed.

R

Rectify original repair All weld is accepted

A

A

R

A

R Remove entire weld and reweld… Or 100% RT and rectify the repairs

R

R

R

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Sub Section C PART UCS : Material Requirements UCS-6:

STEEL PLATES (b)

UCS-56:

Steel plates conforming to SA-36, SA/CSA-G40.21 38W, and SA-283 Grades A, B, C, and D may be used for pressure parts in pressure vessels provided all of the following requirements are met: (1)

The vessels are not used to contain lethal substances, either liquid or gaseous.

(2)

The material is not used in the construction of unfired steam boilers [see U-1(g)].

(3)

With the exception of flanges, flat bolted covers, and stiffening rings, the thickness of plates on which strength welding is applied does not exceed 5⁄8 in. (16 mm).

REQUIREMENTS FOR POSTWELD HEAT TREATMENT

TABLE UCS-56 POSTWELD HEAT TREATMENT REQUIREMENTS FOR CARBON AND LOW ALLOY STEELS Normal Holding Temperature, °F (°C), Minimum

Material

P-No. 1 Gr. Nos. 1, 2, 3 Gr. No. 4

Minimum Holding Time at Normal Temperature for Nominal Thickness [See UW-40(f)] Up to 2 in. (50 mm)

1,100 (595)

1 hr/in. (25 mm), 15 min minimum

= not applicable

None

Over 2 in. to 5 in. (50 mm to 125 mm) 2 hr plus 15 min for each additional inch (25 mm) over 2 in. (50 mm)

Over 5 in. (125 mm) 2 hr plus 15 min for each additional inch (25 mm) over 2 in. (50 mm)

None

None

NOTES: (1)

When it is impractical to postweld heat treat at the temperature specified in this Table, it is permissible to carry out the postweld heat treatment at lower temperatures for longer periods of time in accordance with Table UCS-56.1.

(2)

Postweld heat treatment is mandatory under the following conditions: (a)

for welded joints over 1½ in. (38 mm) nominal thickness;

(b)

for welded joints over 11⁄4 in. (32 mm) nominal thickness through 11⁄2 in. (38 mm) nominal thickness unless preheat is applied at a minimum temperature of 200°F (95°C) during welding; Page 18 of 27

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010) (c)

UCS-57:

for welded joints of all thicknesses if required by UW-2, except postweld heat treatment is not mandatory under the conditions specified below: (1)

for groove welds not over ½in. (13 mm) size and fillet welds with a throat not over ½in. (13 mm) that attach nozzle connections that have a finished inside diameter not greater than 2 in. (50 mm), provided the connections do not form ligaments that require an increase in shell or head thickness, and preheat to a minimum temperature of 200°F (95°C) is applied;

(2)

for groove welds not over 1⁄2 in. (13 mm) in size or fillet welds with a throat thickness of 1⁄2 in. (13 mm) or less that attach tubes to a tubesheet when the tube diameter does not exceed 2 in. (50 mm). A preheat of 200°F (95°C) minimum must be applied when the carbon content of the tubesheet exceeds 0.22%.

(3)

for groove welds not over 1⁄2 in. (13 mm) in size or fillet welds with a throat thickness of 1⁄2 in. (13 mm) or less used for attaching nonpressure parts to pressure parts provided preheat to a minimum temperature of 200°F (95°C) is applied when the thickness of the pressure part exceeds 11⁄4 in. (32 mm);

(4)

for studs welded to pressure parts provided preheat to a minimum temperature of 200°F (95°C) is applied when the thickness of the pressure part exceeds 11⁄4 in. (32 mm);

(5)

for corrosion resistant weld metal overlay cladding or for welds attaching corrosion resistant applied lining (see UCL-34) provided preheat to a minimum temperature of 200°F (95°C) is maintained during application of the first layer when the thickness of the pressure part exceeds 11⁄4 in. (32 mm).

RADIOGRAPHIC EXAMINATION TABLE UCS-57 THICKNESS ABOVE WHICH FULL RADIOGRAPHIC EXAMINATION OF BUTT WELDED JOINTS IS MANDATORY P-No. & Group No. Classification of Material

Nominal Thickness Above Which Butt Welded Joints Shall Be Fully Radiographed, in. (mm)

1 Gr. 1, 2, 3

11⁄4 (32)

3 Gr. 1, 2, 3

3⁄4 (19)

4 Gr. 1, 2

5⁄8 (16)

5A Gr. 1, 2

0 (0)

5B Gr. 1, 2

0 (0)

5C Gr. 1

0 (0)

…….and so on

Page 19 of 27

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

LOW TEMPERATURE OPERATION UCS-66:

MATERIALS

FIG. UCS-66.2

DIAGRAM OF UCS-66 RULES FOR DETERMINING LOWEST MINIMUM DESIGN METAL TEMPERATURE (MDMT) WITHOUT IMPACT TESTING

Establish nominal thickness [Note (1)] of welded parts, non welded parts, and attachments under consideration both before and after corrosion allowance is deducted (tn and tn – c, respectively), and other pertinent data applicable to the nominal thickness such as: All applicable loadings [Note (2)] and coincident minimum design metal temperature (MDMT)

Step 1

Materials of construction E= joint efficiency [Note (3)]

tn= nominal non-corroded thickness [Note (1)], in. (mm) tr= required thickness in corroded condition for all applicable loadings [Note (2)], based on the applicable joint efficiency [Note (3)], in. (mm) Applicable curve(s) of Fig. UCS-66 c= corrosion allowance, in. (mm)

Step 2

Select MDMT from Fig. UCS-66 [Note (4)] for each nominal non-corroded governing thickness [Note (5)].

Determine Ratio: (trE*) /( tn – c)

Step 3

[Notes (3), (6), (7), and (8)]

Step 4

Using Ratio from Step 3 to enter ordinate of Fig. UCS-66.1, determine reduction in Step 2 MDMT [Note (9)].

Step 5

Determine adjusted MDMT for governing thickness under consideration.

Repeat for all governing thicknesses [Note (5)] and take warmest value as the lowest allowable MDMT to be marked on nameplate for the zone under consideration [Note (10)]. See UG-116.

Step 6

See UG-99(h) for coldest recommended metal temperature during hydrostatic test [Note (6)]. See UG-100(c) for coldest metal temperature permitted during pneumatic test [Note (6)].

Required

Optional

Page 20 of 27

Refer UG-20(f) also

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

FIG. UCS-66 IMPACT TEST EXEMPTION CURVES (CONT’D) NOTES: (1) Curve A applies to: (a) all carbon and all low alloy steel plates, structural shapes, and bars not listed in Curves B, C, and D below; (b)

SA-216 Grades WCB and WCC if normalized and tempered or water-quenched and tempered; SA-217 Grade WC6 if normalized and tempered or waterquenched and tempered.

(2) Curve B applies to: (a) SA-216 Grade WCA if normalized and tempered or water-quenched and tempered SA-216 Grades WCB and WCC for thicknesses not exceeding 2 in. (50 mm), if produced to fine grain practice and water-quenched and tempered

Page 21 of 27

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010) SA-217 Grade WC9 if normalized and tempered SA-285 Grades A and B SA-414 Grade A SA-515 Grade 60 SA-516 Grades 65 and 70 if not normalized SA-612 if not normalized SA-662 Grade B if not normalized SA/EN 10028-2 P295GH as-rolled; (b)

except for cast steels, all materials of Curve A if produced to fine grain practice and normalized which are not listed in Curves C and D below;

(c)

all pipe, fittings, forgings and tubing not listed for Curves C and D below;

(d)

parts permitted under UG-11 shall be included in Curve B even when fabricated from plate that otherwise would be assigned to a different curve.

(3) Curve C applies to: (a) SA-182 Grades 21 and 22 if normalized and tempered SA-302 Grades C and D SA-336 F21 and F22 if normalized and tempered SA-387 Grades 21 and 22 if normalized and tempered SA-516 Grades 55 and 60 if not normalized SA-533 Grades B and C SA-662 Grade A; (b)

all material of Curve B if produced to fine grain practice and normalized and not listed for Curve D below.

(4) Curve D applies to: SA-203 SA-508 Grade 1 SA-516 if normalized SA-524 Classes 1 and 2 SA-537 Classes 1, 2, and 3 SA-612 if normalized SA-662 if normalized SA-738 Grade A SA-738 Grade A with Cb and V deliberately added in accordance with the provisions of the material specification, not colder than −20°F (−29°C) SA-738 Grade B not colder than −20°F (−29°C) SA/AS 1548 Grades 7-430, 7-460, and 7-490 if normalized SA/EN 10028-2 P295GH if normalized [see Note (e)(3)] SA/EN 10028-3 P275NH

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

UCS-68(c)

If postweld heat treating is performed when it is not otherwise a requirement of this Division, a 30°F (17°C) reduction in impact testing exemption temperature may be given to the minimum permissible temperature from Fig. UCS-66 for P-No. 1 materials. The resulting exemption temperature may be colder than −55°F (−48°C).

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

MANDATORY APPENDIX 8 METHODS FOR LIQUID PENETRANT EXAMINATION (PT) 8-3

EVALUATION OF INDICATIONS An indication of an imperfection may be larger than the imperfection that causes it; however, the size of the indication is the basis for acceptance evaluation. Only indications with major dimensions greater than 1⁄16 in. (1.5 mm) shall be considered relevant.

8-4

(a)

A linear indication is one having a length greater than three times the width.

(b)

A rounded indication is one of circular or elliptical shape with the length equal to or less than three times the width.

(c)

Any questionable or doubtful indications shall be reexamined to determine whether or not they are relevant.

ACCEPTANCE STANDARDS These acceptance standards shall apply unless other more restrictive standards are specified for specific materials or applications within this Division. All surfaces to be examined shall be free of: (a)

relevant linear indications;

(b)

relevant rounded indications greater than 3⁄16 in. (5 mm);

(c)

four or more relevant rounded indications in a line separated by 1⁄16 in. (1.5 mm) or less (edge to edge).

Indication size > 5.0 mm

Relevant: Noted & Not Acceptable (Rejected / Repair)

1.5 – 5.0 mm

Relevant: Noted & Acceptable

< 1.5 mm

Irrelevant: Acceptable

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Code Interpretations ----------------------------------------------------Interpretation: VIII-1-01-02 Subject: Section VIII, Division 1 (1998 Edition, 1999 Addenda); UG-99(g) Date Issued: September 8, 2000 File: BC00-393 Question:

A vessel is subjected to the hydro test under UG-99. During the test, a leak is detected from the gasket seat of a permanent flanged joint. In meeting the requirements of UG-99(g) in Section VIII, Division 1, may the hydro test be accepted if the flanged joint and the vessel as a whole are found to be completely tight after the pressure is reduced to not less than the test pressure divided by 1.3?

Reply: Yes. ----------------------------------------------------Interpretation: VIII-1-98-86 Subject: Section VIII, Division 1 (1998 Edition, 1998 Addenda); UG-99(b) and (c) Date Issued: October 25, 1999 File: BC99-346 Question:

Do the requirements of UG-99(b) and (c) in Section VIII, Division 1 preclude the use of a temperature recorder for the test medium during the performance of the hydrostatic test?

Reply: No. ----------------------------------------------------Interpretation: VIII-1-98-110 Subject: Section VIII, Division 1 (1998 Edition, 1999 Addenda); UW-40(c) and UCS-56(d)(3) Date Issued: March 22, 2000 File: BC00-082 Question:

In complying with the requirements of UW-40(c) and UCS-56(d)(3) in Section VIII, Division 1, is it necessary to have thermocouples attached to both the inside and outside surfaces of a vessel during postweld heat treatment?

Reply: No. ----------------------------------------------------Page 25 of 27

ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Interpretation: VIII-1-01-85 Subject: Section VIII, Division 1 (1998 Edition, 2000 Addenda); UW-31(d) and UW-33(a) Date Issued: September 24, 2001 File: BC01-325 Question(1):In meeting the requirements of Section VIII, Division 1, may the over thickness tolerance, as permitted by the plate specification, be excluded from the maximum offset in evaluating the alignment tolerances of UW-31(d) and UW-33? Reply (1): No. Question(2):May the maximum offset per UW-33(a) be increased by an amount equal to the difference between the actual thickness and the required thickness? Reply (2): No. -----------------------------------------------------

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ASME Sec VIII Div 1– Basics – nrs (Rev.5 – 12 Mar 2010)

Information

Basics: the simplest and most important facts Concept: Principle or idea Philosophy: use of principles that govern and influence judgment

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