VOL 12.pdf

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INTE RPRETATIONSNO. 12 SECTION

Replies to Technical InquiriesJ uly 1, 1982, through December 31, 1982

and Revisions Issued J uly 1, 1982, through April 1, 1983

FOREWORDThis publication includes all of the written replies issued between the indicated dates by the ASME

Staff on behalf of the ASME Boiler and Pressure Vessel Committee to inquiries concerninginterpretations of the Boiler and Pressure Vessel Code. These interpretations are not a part of theAddenda or the Code.

These replies are taken verbatim from the original letters, except for a few typographical andeditorial corrections made for the purpose of improved clarity. In some instances, a review of theinterpretation revealed a need for corrections of a technical nature. In these cases, a revised reply,bearing the original interpretation Number with the suffix RI is presented. Following these revisedreplies, new interpretations, and revisions to them issued during the same 6-month period, areassigned Interpretation Numbers in chronological order. interpretations applying to more than oneCode Section appear with the replies pertainingto each affected Section.

ASME procedures provide for reconsideration of these interpretations when or if additionalinformation is available which the inquirer believes might affect the interpretation. Further, personsaggrieved by an interpretation may appeal to the cognizant ASME committee or subcommittee. Asstated in the Statement of Policy in the Code documents, ASME does not "approve," "certify,""rate," or "endorse" any item, construction, proprietary device, oractivity.

These replies apply to the latest Edition and Addenda at the time of the inquiry or the Edition andAddenda stated in the reply. Subsequent revisions to the rules may have superseded the reply.

For detailed instructions on "Preparation of Technical Inquiries to the Boiler and Pressure VesselCommittee," refer to Appendix I.

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I 007275 0031465 451

SECTION ISubjectPEB-9.............................................................................................PFT-9.2.2, Tapered Shells .......................................................................PFT-14.1.2, Use of SA-53 for Plain Furnaces ................................................PG-2.3 ............................................................................................PG-22, Effects of Loads Caused by Earthquakes...............................................PG-39.5, Pressure Limitations for Threaded J oints ............................................PG-60.1, Cage Class Requirement..............................................................PG-67.3, Safety Valve Set Pressure.............................................................

Operating Procedure ..........................................................................PC-99, Hydrotest Pressures for Forced Circulation Boiler System............................PW-51, Time of Examination...................................................................Fig. PW-16.1, sketch (z), Applicability to Thin-Wall Designs .................Table PW-39, Postweld Heat Treatment of Tubes Welded Into Drums .....................Acceptance Standards When Radiography Is Not Required

PC-61.1...........................................................................................PC-67.............................................................................................PG-72.2, Use of Hydraulic or Pneumatic Lift Device to Establish Safety ValvePW-39.2 ..........................................................................Form P-2A, Listingof Miscellaneous Piping....................................................

.................................Automatic Blowdown Systems ...............................................Hardness of Swaged Portion of Boiler Tubes ..................................................Identification of Pipe Material...........................................................Errata to Volume 2 ..............................................................................External Piping ...................................................................................Immersion Element Boilers ......................................................................Large Bolting Flanges ....................................................................Listing of Miscellaneous Openings on P-2 Forms ............................................MAWP for Class 300 Flanges and Valves .....................................................Part PEB Stamping Requirements ...............................................................Permissible Flattening in Tube Bends...........................................................Permissible Internal Stresses for SA-335........................................................Personnel Qualification for Examination of BEP ........... ...............................Removal of Temporary Attachments............................................................Requirements for Organic Vapor Generators...................................................Tell-Tale Holes in Welded and Threaded Staybolts ..........................................

Interpretation1-83-271-83-191-83-211-83-171-83-021-83-251-83-1 31-83-031-83-041-83-181-83-3 11-83-111-83-1O1-83-1 51-83-081-83-161-83-201-83-281-83-141-77-281-83-061-83-011-77-2811-83-301-83-071-83-221-83-241-83-261-83-231-83-051-83-291-83-1 21-81 02R1-83-09

File No. BC82-177BC82-251BC82-503BC82-3 55BC80-346BC82-267BC82-179BC80-309BC80-412BC82-362BC82-615BC82-356BC80-694BC81-685ABC77-783BC82-233BC82-351BC82-343BC82-418BC81-708BC75-286BC80-443BC79-382BC75-286*BC82-554ABC77-762BC82-620BC82-266BC80-641BC81-553BC79-774BC82-438BC82-505BC81-428BC79-381*BC80-509

Asterisk indicates reply has been revised on e or m ore times .3

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m 9009275 0031466 398 mI-77-28Rection I- nterpretationsNo. 12

Interpretation: 1-77-2811Subject: Section I , identification of Pipe MaterialDate Issued: December 20, 1982File: BC75-286*

Question: MayA 53 andA 106pipe be used to fabricate Section iboiler external piping withoutthe need to provide certified mill test reportsormanufacturer certification provided the pipe is markedin accordance with the ASTM A designation?

Reply: The manufacturer who orders pipe material for a Code application is responsible forordering it to Code requirements and shall have a material control system that ensures that the propermaterial is used in Code construction. The manufacturers certification includes acknowledgementthat the material requirements of the Code have been met. This certification by the manufacturerproperly countersigned by the Authorized inspector who provides inspection service for thatmanufacturer, may be accepted by you or others as sufficient evidenceof Code compliance.

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9009275 0033467 22Y

1-81-O2R Section i - nterpretations No. 12Interpretation: I-81-02RSubject: Section i, Requirements for Organic Vapor GeneratorsDate issued: September 24, 1982File: BC79-381*

Question (1 Doesthe term "organic fluid" apply to such hydrocarbon fluids, or their processingby means of a fired heater (pressure vessel) as defined in the last paragraph of the Preamble?

Reply (11 The term "organic fluid" as specified in the Preamble applies to any hydrocarbon thatis vaporized in a pressure vessel by the application of heat resulting from the combustion of fuel (solid,liquid, or gaseous). Processing of liquid hydrocarbons s not within the scope of this Section.

Question ( 2 ) : Do the rules as stated in PVG-1 generally construe or include such fired heaters as"organic fluid" vaporizer generators?

Reply (2): Yes, except when such a heater is part of a processing system, such as used inchemical and petroleum manufacture.As stated in the Preamble, such a heater is not covered by therules of this Section.

Question ( 3 ) : Isa direct fired pressure vessel, used to heat a liquid hydrocarbon under pressurewithout vaporizing the liquid, covered by Section i?

Reply ( 3 ) : No, the Preamble states that the liquid hydrocarbon hasto be vaporized.Question (4): is a direct fired pressure vessel used to heat a liquid hydrocarbon with partial or

complete vaporization covered by Section I?Reply (4): Yes, except when such a direct fired pressure vessel is part of a processing system,

such as used in chemical and petroleum manufacture. As stated in the Preamble, such a pressurevessel is not covered by the rules of this Section.

Question (5): s a direct fired pressure vessel used to thermally crack an already vaporizedhydrocarbon covered by Section i?

Reply(5):No, this is a processing system and Section i is not applicable.Question (6): Does another governing body, such as a state or local municipality, which has

adopted the Boiler and Pressure Vessel Code either in whole or in part, have the right to interpret themeaning of such words or wording differently than the ASME and use their interpretation as arequirement for Code stamping?

Reply (6): No. Only the ASME Boiler and Pressure Vessel Committee has the responsibility ofinterpreting the Code. However, the local jurisdiction does have the authority to establishrequirements for acceptabilityof components within the scope of its laws.

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Section I - nterpretations No. 12 1-83-01, 1-83-02Interpretation: 1-83-01Subject: Section I, Hardness of Swaged Portion of Boiler TubesDate issued: August 5, 1980File: BC79-382

Question: Is it required that carbon steel tubes such as SA-210 A-1 which have undergonefabrication operations by the boiler manufacturer meet the maximum hardness specified in thespecifications?

Reply: No. The maximum hardness specified in the Section II material specification is one of anumber of requirements intended to help ensure that the tubing furnished by the materialmanufacturer will withstand fabrication and installation requirements. Section I does not specifyhardness limits for the tubingas fabricated and installed in a boiler.

Note: This Interpretation should have appeared in Volume8, covering the periodof J uly1, 1980,through December31 1980.

Interpretation: 1-83-02Subject: Section I, PG-22, Effects of Loads Caused by EarthquakesDate Issued: August 6, 1980File: BC80-346

Question: Is it acceptable in the design of solar boiler panels in accordance with PG-22 toaccount for seismic loads by satisfying the provisions of paragraph 104.8.2 of ANSI B31.1-1977?

Reply: Section i does not provide specific design rules, guidance, or criteria for combinedpressure and bending loads such as may occur during an earthquake. However, designers of Codeequipment are obligated to apply supplementary requirements consistent with good engineeringpractice for items on which the Code is not specific. Satisfying the provisions of ANSI/ASME B31.1for"stresses due to occasional loads" is one of several acceptable methods of accounting for earthquakeloadings.

Note: This Interpretation should have appeared in Volume8,covering the period of J uly 1, 1980,through December31, 1980.

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rn 7007275 O033467 OT 7 rn1-83-03, 1-83-04 Section I- nterpretations No. 12

Interpretation: 1-83-03Subject: Section I, PG-61.1Date Issued: August 15, 1980

File: BC80-309Question: Is a black liquor chemical recovery boiler equipped with an emergency rapid drain

system required to have a steam driven feedwater pump to satisfy the provisionsof PG-61.1?Reply: No, since it has been demonstrated that the heat source of a black liquor chemical

recovery boiler equipped with an emergency rapid drain systemdoes not supply sufficient heat todamage the boiler if feedwater is interrupted, it is not required that one of the feedwater pumps besteam driven.

Note: This Interpretation should have appeared in Volume 8, covering the period of J uly 1, 1980,through December31, 1980.

Interpretation: 1-83-04Subject: Section I, PG-67Date Issued: August 15, 1980File: BC80-412

Question: When a superheater is attached to a boiler drum that has more than 500 sq ft ofheating surface, and no intervening stop valve is located between the drum and the superheater, maythe superheater safety valves be included as part of the valve relieving requirement for the boiler?

Reply: Yes, provided all other requirements are met (see PG-68.2).Note: This Interpretation should have appeared in Volume 8 covering the period of J uly 1, 1980,

through December 31,1980.

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. 9009275 0031470 A19-

Section I - nterpretations No. 12Interpretation: 1-83-05

1-83-05, 1-83-06

8Subject: Section i, Permissible internal Stresses for SA-335Date issued: October 20, 1980File: BC79-774

Question: Does SectionIaddress secondary stresses which are the result of a pipe manufacturingprocess without subsequent stress relieving?

Reply: Section I addresses membrane stresses only. Secondary or residual stresses are notspecifically addressed in Sectionibut should be recognized by the designer.

Interpretation: 1-83-06Subject: Section i, External PipingDate issued: October 20, 1980File: BC80-443

Question: Is ita requirement of Section i that external piping within the scope of the Code whichis installed by mechanical means (no welding) be installed by an organization in possession of the S,PP, or A Code Symbol Stamps?

Reply: Although the piping must be fabricated by a stamp holder, the installation of piping bymechanical means (e.g., threaded joints) may be performed by an organization not holding a Codestamp.

Note: This interpretation should have appeared in Volume 8, covering the period of Iuly 1 , 1980,through December 31, 1980.

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9009275 003L47L 755 M ,

1-83-07, 1-83-08Interpretation: 1-83-07

Section I - nterpretations No. 12-

*Subject: Section I, Large Bolting FlangesDate issued: October 24, 1980File: BC77-762

Question: May forged steel, integral-type bolting flanges larger than those covered in thereferenced standard ANSI 61 6.5, be designed according to Appendix2 of SectionVIII, Division i, forapplications to Section ?

Reply: Forged steel integral-type bolting flanges larger than those covered in the referencedstandard ANSI B16.5 may be designed according to SectionVIII, DivisionI, Appendix 2, provided thematerial selection and fabrication comply with the requirements of Section I.

Note: This Interpretation should have appeared in Volume 8 covering the period of J uly1, 1980,through December31, 1980.

Interpretation: 1-83-08Subject: Section I , Applicability of Fig. PW-16.1, Sketch ( 2) to Thin-Wall DesignsDate issued: October 24, 1980File: BC77-783

Question: In small diameter headers made under PartPW s it permissible to have a recessedjoint configuration without full penetration?

Reply: No. [ SeeFig. PW-16.1(2)].Note: This Interpretation should have appearedinVolume 8, covering the periodof J uly1, 1980,

through December31, 1980.

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Section I - nterpretations No. 12 1-83-09, 1-83-10Interpretation: 1-83-09Subject: Section I, Tell-Tale Holes in Welded and Threaded StayboltsDate issued: November 11, 1980File: BC80-509

Question: Will Section I be revised to require that ail staybolts used in Section I construction(threaded or welded) be hollow or at least drilled to sufficient depthso that the hollow portion shallextend in. past the inside of the outer plate?

Reply: The industry experience with solid welded staybolts has been .good, therefore, theSubcommittee feels that revisions to the present rules are 'not warranted. The requirements forstaybolts are given in PG-47.

Note: This Interpretation should have appeared in Volume8, covering the period of July1, 1980,through December 31, 1980.

Interpretation: 1-83-1OSubject: Section I, PW-39.2Date Issued: December 29, 1980File: BC80-694

Question: Do the postweld heat treatment exemptions of Table PW-39 for P-No. 5 materialapply to a socket weld of a P-No. 5 valve to a pipe of a lower P-Number, such as P-No. 1

Reply: Yes.Note: This Interpretation should have appeared in Volume 8 covering the period of July 1, 1980,

through December 31, 1980.

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m 9009275 0033473 528 =1-83-11, 1-83-12 Section I - nterpretationsNo. 12

-Interpretation: 1-83-11Subject: Section I, PG-99, Hydrotest Pressures for Forced Circulation Boiler SystemDate Issued: J uly 19, 1982File: BC82-356

Question: A forced circulation boiler system incorporating waste heat exchangers is arranged sothat individual heat exchangers may be isolated by valves on either side, for maintenance, and forflexibility of system operation. A closed valve in any of these forced circulation loops has the potentialof causing the pressure to increase between that valve and the forced circulation pump to the sumofthe normal working pressure and the maximum pump discharge pressure. Accordingly, the designpressure of those boiler system components potentially subject to this extra pressure i s chosensubstantially higher than the maximum allowable working pressure of the boiler drum. What is theappropriate hydrotest pressure to be applied for such a system, which comprises a number of differentdesign pressure zones!

Reply: In accordance with PG-99, the completed boiler shall be subjected to a hydrostatic test at1Z times the maximum allowable working pressure to be stamped on the boiler. Those zones whichare designed for a higher pressure because of valving arrangements shall be hydrotested at 1 timestheir respective maximum allowable working pressures, following the general procedures outlined inPG-99.1 and PG-99.2. Note that each zone of maximum allowable working pressure must meet thesafety valve requirements of the Code.

Interpretation: 1-83-12Subject: Section I, Removal of Temporary AttachmentsDate Issued: August 19, 1982File: BC81-428

Question: By what means may temporary attachments be removed?Reply: Attachments used during fabrication or assembly may be removed by any method which

will not damage the pressure boundary material.

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1-83-1 3, 1-83-14, 1-83-15ection i- nterpretations No. 12Interpretation: 1-83-1 3Subject: Section I , PG-60.1, Gage Glass RequirementsDate Issued: August 20, 1982File: BC82-179

Question: For a boiler whose design pressure is 900 psig or above, PG-60.1.1 permits thesubstitution of t wo remote level indicators for one of thetwo gage glasses normally required. Does thismean that the boiler may be furnished with only a single gage glass, which may then be shutoffwhenboth remote level indicators are in reliable operation?

Reply: Yes, but note that the single gage glass must be maintained in a serviceable condition.

interpretation: 1-83-14Subject: Section I, Automatic Blowdown SystemsDate issued: September 22, 1982File: BC81-708

Question: May automatic blowoff or blowdown devices be installed on boilers constructed toSection I requirements?

Reply: Such a device may be installed within the Code jurisdictional limits provided the pressureretaining parts of the device comply with the requirements of Section i.

interpretation: 1-83-15Subject:Date Issued: September 23, 1982

Section I, PW-51, Time of Examination

File: BC81-685AQuestion: Is ita requirement of Section I that radiography be performed after final machining?Reply: No. PW-51 does not require radiography after final machining; the intent is that

penetrameter selection be based on the weld thickness at the time radiography is performed.

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1-83-16, 1-83-17, 1-83-18 Section i- nterpretations No. 12Interpretation: 1-83-16Subject:Date issued: September 23, 1982

Section I, Form P-2A, Listing of Miscellaneous Piping

File: ~a2 - 233Question: Is it a requirement of Section I that piping items other than steam, feedwater, and

blowoff listed on Form P-2Af Item 16, be included when completing Forms P-2A or P-67Reply: No.

Interpretation: 1-83-17Subject: Section I, PG-2.3Date issued: September 23, 1982File: ~a2 - 35s

Question: Does the exemption to Section rules permitted by PG-2.3 for a coil-type hot waterboiler without any steam space apply without regard to the operating pressureofthe boiler?

Reply: Yes.

Interpretation: 1-83-18Subject:Date Issued: September 23, 1982

Section I , PG-67.3, Safety Valve Set Pressure

File: BC82-362Question: PC-67.3 requires one or more safety valves on the boiler proper to be set at or below

the maximum allowable working pressure. Does this paragraph apply only to the safety valves on theboiler drum, or could a safety valve installed downstreamofthe superheater be considered as the lowsetvalve?

Reply: PG-67.3 applies only to the saturated-steam safety valves on the boiler drum.At leastonesuch valve must be set at or below the maximum allowable working pressure.

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9009275 0033476 237-

Section I- nterpretations No. 12 1-83-19, 1-83-20, 1-83-21Interpretation: 1-83-19Subject: Section I, PFT-9.2.2, Tapered ShellsDate Issued: September 24, 1982File: BC82-25 1

Question: In a firetube boiler, when joining heads to shells of unequal thickness, is itrequired thatthe tapered sections of the cylindrical shell meet the requirements of PFT-9.2.2 of Section ?

Reply: No, the tapered transition section between the head and shell shall comply with therequirements of PW-9, employing the required shell and head thickness as determined by PG-27.2and PFT-9.2.1, espectively.

interpretation: 1-83-20

Subject: Section I , Table PW-39, Postweld Heat Treatment of Tubes Welded IntoDrumsDate Issued: September 24, 1982File: BC82-351

Question: Does Section I have rules pertaining to postweld heat treatment of welds attachingtubes of P-No. 3,4, or 5 material to headers or drums?

Reply: Yes. PWT-11.2 requires postweld heat treatment of such welded connections.

Interpretation: 1-83-21Subject: Section I, PFT-14.1.2, Use of SA-53 for Plain FurnacesDate Issued: September 24, 1982File: BC82-503

Question: May SA-53, Grade B Electric Resistance Welded Pipe be used in the fabrication ofplain furnaces under Section I rules where a bend test of the weld is made for each section of thefurnace in accordance with the requirementsof PFT-14.1.2?

Reply: This material does not meet the requirementsof PFT-14.1.2, and is not permitted for usein this application.

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1-83-22,1-83-23Interpretation: 1-83-22

Section I - nterpretations No. 12

Subject: Section I, Listing of Miscellaneous Openings on P-2 formsDate Issued: September 24, 1982File: BC82-620

Question: Is it necessary to list openings other than those specifically required on the P-2Manufacturers Data Report Form?

Reply: No.

Interpretation: 1-83-23Subject: Section I, Permissible Flattening in Tube BendsDate Issued: December 7, 1982File: BC81 553

Question: What rules does Section impose with respect to wall thinning and flattening of bendsin boiler tubing?

Reply: Section I does not provide specific rules directly applicable to wall thinning and flatteningof bends in boiler tubing. However, the Subcommittee on Power Boilers intends that the manufacturershall select a combination of thickness and configuration such that the strength of the bend underinternal pressurewill at least equal the minimum strength required for the straight tube connected tothe bend. The Subcommittee on Power Boilers position, basedon many years of service experience,has been that thinning and flattening of tube bends are permissible within limits established by themanufacturer, based upon proof testing.

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9009275 0033478 OUT

Section I - nterpretationsNo. i 2Interpretation: 1-83-24

1-83-24, 1-83-25

Subject: Section I, MAWP for Class 300 Flanges and ValvesDate Issued: December 20, 1982File: 5C82-266

Question: May 300 Class Material Group 1.1 flanged valves and flanged fittings be used on aboiler whose maximum allowable working pressure is 600 psig?

Reply: Section I rules (PG-11) permit the use of standard pressure parts such as valves andflanged fittings which comply with an ANSI product standard listed in PG-42. The ANSI standards(B16.34, Steel Valves; B16.5, Steel Pipe Flanges and Flanged Fittings) provide pressure-temperatureratings for these components. The actual choice of fitting is complicated somewhat by the fact thatSection I and 531.1 mandate certain overpressure design requirements or boiler feed and blowoff lineservice (see B31.l, aragraph 122.11, and also because the rating of a fitting is a function of thematerial as well as of the pressure class. The user must therefore follow a multi-step procedure whichvaries depending on whether saturated steam service or boiler feed and blowoff service is involved:

(1) establish boiler maximum allowable working pressureP;(2) establish feedwater and blowoff line pressuresPFor f 8as lesser of fF=P +225 psig or f F(3) select fitting material;(4) use either the ANSI 516.34 or B16.5 pressure-temperature ratings, for that material group.

Check successively higher pressure classes until one is found whose pressure rating, at the saturationtemperature corresponding to P equals or exceeds the required pressure rating (P,or P8for feedwateror blowoff lines, f for saturated steam lines). That is the pressure rating, or class, required for the fittingat saturation temperature. Note that a valve subject to hydrostatic test pressure in its closed positionmay require a higher pressure rating. Refer to the testing provisions of ANSI 81 6.34.

=1.25P;

Interpretation: 1-83-25Subject: Section I, PG-39.5, Pressure Limitations for Threaded J ointsDate Issued: December 20, 1982File: BC82-267

Question: PG-39.5.2 tabulates size and pressure limitations for threaded joints for boilerconnections for external piping where the temperature does not exceed 925F (496C). s interpolationof this table permissible?

Reply: No.

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1-83-26, I - 83-27Interpretation: 1-83-26

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9009275 0033479 T4b a

Section I - nterpretations No. 12

Subject: Section I , Part PEB, Stamping RequirementsDate Issued: December 21, 1982File: BC80-641

Question ( I ) : What are the stamping requirements for a completed electric boiler where an Ssymbol stamp holder furnishes only the piping, fittings, and appurtenances?

Reply(1 The completed electric boiler shall be stamped in accordance with PEB-18.3.2.Question (2): What are the stamping requirements for an electric boiler where anS symbol stamp

holder furnishes both the pressure vessel and the piping, fittings, and appurtenances?Reply (2): The boiler pressure vessel shall be stamped in accordance with PEB-18.3 and the

completed boiler stamped in accordance with PEB-18.3.2.Question (3): Is ita requirement that the Certificateof Shop inspectionof a completed electric

boiler be signedbythe Authorized Inspector, providing the conditions of PEB-18.1 are met?Reply (3): No.Question (4): Is it mandatory that the assembler of a completed electric boiler furnish the steam

stop valve and the btowoff valve?Reply(4): No.

Interpretation: 1-83-27Subject: Section I , PEB-9Date issued: December 21, 1982File: BC82-177

Question: With reference to PEB-9, is it the intent that all requirements of the Section be metwhen either of the two limitations given are exceeded?

Reply: Yes.

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9009275 0033480 768

Section i - nterpretations No. 12Interpretation: 1-83-28

1-83-28, 1-83-29

Subject: Section I, Acceptance Standards When Radiography Is Not RequiredDate Issued: December 21, 1982File: BC82-343, BC82-418

Question: When radiography s not required by Section I , but is used by the fabricator, must theacceptance criteria meet the requirements of PW-51

Reply: No, it is the intent of Section I that radiographic standards for welds for which Section Idoes not require radiography are outside the scope of the Code.

Interpretation: 1-83-29Subject: Section I, Personnel Qualification for Examination of BEPDate Issued: December 21, 1982File: BC82-438, BC82-505

Question: What are the requirements for qualification of a manufacturers personnel performingvisual examination of boiler piping welds?

Reply:(a) For boiler proper piping, Section I does not directly address requirements for personnel

performing visual examination of boiler piping welds. This shall be addressed in the manufacturersquality control system (A-300).

(b) For boiler external piping, PG-58.3 refers to the requirements of ANSI/ASME B31.1;paragraph 136.1 applies and such personnel shall be qualified and certified.M anufacturers personnel is intended to include personnel performingwork forwhich the manufacturer is responsible.

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1-83-30, 1-83-31Interpretation: 1-83-30

D 9009275 0031481 bT4 W

Section I- nterpretations No. 12

Subject: Section i, immersion Element BoilersDate Issued: December 21, 1982

File: BC82-554AQuestion (1 : i s it permissible to construct electric resistance immersion element boilers to

Section ViiI, Division 1, and use all of the materials listed in SectionViII, Divisionl?Reply (1 : No.Question (2): When constructing electric resistance immersion element boilers to Section Viii,

Division 1, do the requirements of PEB-3.2.1 have to be considered, thus limiting the materialselection to those permitted by Section I ?

Reply (2): Yes.Question (3): May an electric boiler of the immersion element type be considered as anEvaporator or Heat Exchanger?Reply (3): No.

I nterpretation: 1-83-31Subject: Section I, PG-72.2, Use of Hydraulic or Pneumatic Lift Device to Establish

Safety Valve Operating PressureDate Issued: December 21, 1982File: BC82-615

Question: PG-72.2 stipulates the opening pressure tolerance for safety valves used in Section iconstruction. May a hydraulic or pneumatic liftdevice be used to check opening pressure and valvefunction in lieu of a full pressure test which requires raising boiler pressure to the set pressure of thevalves?

Reply: A hydraulic or pneumatic liftdevice may be used to apply an auxiliary lifting load on thevalve spring to establish the set pressure of a safety valve, provided calibrated testing equipment andtesting procedures are followed, While actual valve blowdown and valve performance characteristicscannot thus be verified, valve set pressure may be determined to an acceptable degree of accuracyusing this testing technique.

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9009275 0031482 530 =Section I - nterpretations No. 12 Errata

ERRATAVolume 2Interpretation 1-77-82 Correct thesecond sentence of the Replyto read:

The manufacturers certification includes acknowledgement that the ma-terial requirements of the Code have been met. This certification by themanufacturer, properly countersigned by the Authorized Inspector whoprovides inspection service for that manufacturer, may be accepted byyou or others as sufficient evidence of Code compliance.

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