Local Jurisdictions and how they apply to design and fabrication

This week’s blog we will go through local jurisdictions and the impact they may have on the design, registration and fabrication of your pressure equipment.  Below is a hierarchy of local jurisdictions to construction codes.

 

local jurisdiction .jpg

 

 

The starting point for any project should be the installation location of the equipment you are building.  Your client may reference ASME VIII-1 as the construction code but the local jurisdiction may have different requirements and will take precedence.  This is outlined in ASME Section VIII Division 1 U-1(c)(1).

“The scope of this Division has been established to identify the components and parameters considered in formulating the rules given in this Division. Laws or regulations issued by municipality, state, provincial, federal, or other enforcement or regulatory bodies having jurisdiction at the location of an installation establish the mandatory applicability of the Code rules, in whole or in part, within their jurisdiction. Those laws or regulations may require the use of this Division of the Code for vessels or components not considered to be within its Scope.  These laws or regulations should be reviewed to determine size or service limitations of the coverage which may be different or more restrictive than those given here.”

A great resource to provide an overview of the laws, and regulations related to pressure vessels, boilers and piping (related more to Canada) is the National Board NB-370.  As a cautionary note, due to the scope of what is required to be maintained as current, I would use the link below as a starting point reference and refer back to the local jurisdiction for the actual requirements.

Overview of NB-370

http://www.nationalboard.org/ViewAllSynopses.aspx

Adopted edition year for ASME and NBIC (National Board Inspection Code)

http://www.nationalboard.org/SiteDocuments/Synopsis/2016_code_edition.pdf

All Local Jurisdictions with laws and regulations references, contact information and summary information:

http://www.nationalboard.org/PrintAllSynopsis.aspx?Jurisdiction=Select

So how do you put this into practise?  As an example, a client plans to install a pressure vessel in the Buffalo, NY.  They have specified in their datasheet that the construction code is ASME VIII-1 2015 edition and the vessel looks like it is only 4.5 cubic feet in size.  First we look up Buffalo NY on the national board site.  The website states the 2001, 2002 Addendum are the adopted edition years for the city and the local law states that pressure vessels with volumes under 5 cubic feet do not need ASME stamping.  The contact information is present for the municipal department.  If you are not familiar with the state law, you review their state law here:

http://ecode360.com/BU1237

or contact them directly to confirm the ASME adopted edition years, if newer edition years are accepted and whether an ASME stamp is required for vessels under 5 cubic feet.  Once confirmed you may make your client aware of these permitted conditions or changes and provide them these cost savings.

Canada is a little different than the US since we have provincial requirements that modify the requirements of CSA B51 and CSA B51 makes reference to the ASME codes with slight modifications.

 

ASME IX Welding Requirements Part 3 – Welder or Welding Operator Qualifications

This week’s blog is the third part of three parts regarding ASME IX welding requirements.  In this part we will go through the requirements for Welder or Welding Operator qualifications.

How do you qualify a Welder?

The essential variables that a welder must follow are listed in QW-350 and table QW-416.  We will not look at special processes as they are not as common.  From a performance qualification standpoint these are the only variables that must be documented during a performance test.  Below is a reproduced copy of Table QW-416:

Table QW-416.jpg

Depending on the welding process different essential variables apply.  Each variable has a reference to a paragraph in the welding data section that provides the qualification range for that variable.  For example, a change in pipe diameter has reference to QW-403.16 for the GTAW process.  QW-403.16 refers to table QW-452.3 for permitted diameter ranges.  If the welder were tested on 1/2” NPS pipe, he would be qualified to weld ½” and up.  If the test was on 2” NPS, he would be qualified to weld 1” NPS and up.

Once welded the test coupons must be tested as outlined in QW-304.  Typically bend tests in table QW-452.1(a) are performed but volumetric NDE can be used as well, which is outlined in QW-302.2.  Visual examination is also required detailed in QW-302.4.

Once the tests are passed the welder is qualified to weld within the ranges they were qualified in.  This information should be documented in a form such as QW-484A or QW-484B.

Welding operators are qualified in much the same way as welders with essential weld variables coming from QW-360, and examination requirements coming from QW-305 and QW-305.1.

Helpful Tips:

  • As outlined in QW-423, for welder performance qualifications base metals may be substituted.   That means if you have several welders needing to be qualified to weld P. No. 45 material, you can use P. No. 1 material for the base metal.  The filler metal must follow the WPS.
  • As outlined in QW-433, for welder performance qualifications F-numbers have certain groupings for qualifications as well.  This can be useful for certain F-numbers since qualifying on one may qualify the welder for multiply reducing the amount of tests required.

What is the best test coupon for performance qualifications? 

This really depends on your work and the ranges you work in but from a strictly thickness and diameter standpoint, the follow would provide the greatest range with the least number of tests.  A piece of pipe with a thickness of 0.5" or greater, so 2.5" NPS Sch. XXH (0.552") or 8" NPS Sch. 80 (0.5") for rotator work.  This would provide you with the maximum thickness range.  To get the smaller diameter, a 1/2" sch. 40 would work.  Using Table QW-452.1(b) note 2, the diameter range from 1/2" up to the diameter of the piece used to qualify your welder can be used on the small diameter.  So with these two test your welder is qualified for 1/2" diameter, unlimited thickness.

 

ASME IX Welding Requirements Part 2 – Welding Procedure Specification (WPS)

This week’s blog is the second of three parts regarding ASME IX welding requirements.  In this part we will go through the requirements for Welding Procedure Specifications, common issues and some though provoking examples.

What is a Welding Procedure Specification (WPS)?

It is a written qualified welding procedure prepared to provide direction for making production welds to Code requirements. (QW-200.1(a)).  It can be used to provide direction to the welder or welding operator to assure compliance with Code requirements.

What does a WPS need to contain?

As outlined in QW-200.1(b), unlike PQRs, a WPS must address essential, nonessential, and when required supplementary essential variables.  And again a great resource for determining how to address a variable can be found here:

https://cstools.asme.org/csconnect/FileUpload.cfm?View=yes&ID=46021

The variables are listed in QW-250 for each process.

A WPS must also reference supporting Procedure Qualification Record(s).  Multiple PQRs can be used to create a new WPS.

A WPS can be revised if nonessential variables change without having to requalify a new PQR.  An example of this would be P-No. 8, GTAW process, is qualified with Argon as a backing gas.  The WPS can be revised to use a Argon / Helium / nitrogen mix as the backing gas without requalifying a new PQR.

 Common Issues with WPSs:

Combining WPSs:

As outlined in QW-200.4, more than one WPS maybe used to complete a single production joint.  For the most part combining WPSs is straightforward, if a WPS is qualified for 1/16” to ¾” base metal and weld metal thickness, it can be combined with another WPS is qualified for the same thickness ranges and be used with those ranges.  If you have a WPS that is qualified for 1/16” to ½” and you combine it with a WPS that is qualified from 3/16” to 1”, you would be limited to only using this combination of WPSs for material from 3/16” to ½” thick.  This is also specified in interpretation IX-83-80.  To view this interpretation go to: https://cstools.asme.org/Interpretation/InterpretationDetail.cfm?TrackingNumber=5495

The Code does permit a special case as outlined in QW-200.4(b), when one PQR has a test coupon of at least ½” thick, it can be combined with one or more PQRs with base metal thicknesses greater than ½”.  When these requirements are met, you can use for example a GTAW process with base metal thickness range on the WPS of 3/16” to 1” (PQR ½” base metal thickness used), combine it with a SAW WPS with base metal thickness of 3/16” to 8” (PQR 1.5” base metal thickness used).  A new WPS can be created with a base metal thickness range of 3/16” to 8” with GTAW being used up to 1” thick and the remainder with SAW.

Dissimilar Base Metals:

Another Common issue that comes up is welding of groove welds between two base metals that have different thicknesses.  QW-202.4 has some unique rules to address this. 

  • The thickness of the thinner member shall be within the range permitted by QW-451.
  • The thickness of the thicker member shall be:
  • For P‐No. 8, P‐No. 41, P‐No. 42, P‐No. 43, P‐No. 44, P‐No. 45, P‐No. 46, P‐No. 49, P‐No. 51, P‐No. 52, P‐No. 53, P‐No. 61, and P‐No. 62 metal, there shall be no limitation on the maximum thickness of the thicker production member in joints of similar P‐Number materials provided qualification was made on base metal having a thickness of 1/4 in. (6 mm) or greater.
  • For all other metal, the thickness of the thicker member shall be within the range permitted by QW-451, except there need be no limitation on the maximum thickness of the thicker production member provided qualification was made on base metal having a thickness of 11/2 in. (38 mm) or more.

An example of what this means:

  1. You have a WPS qualified for base metal thickness of 1/16” to ½” for P-No. 8 material.  The pressure vessel being fabricated has a 1” nozzle with wall thickness ¼” and it is welded to a 16” 300# B16.5 flange.  Is the WPS qualified to be used?  The answer is yes.
  2. You have a WPS qualified for base metal thickness of 1/16” to ½” for P-No. 1 material.  The pressure vessel being fabricated has a 1” nozzle with wall thickness ¼” and it is welded to a 16” 300# B16.5 flange.  Is the WPS qualified to be used?  The answer is no.
  3. You have a WPS qualified for base metal thickness of 1/16” to 8” for P-No. 1 material.  The pressure vessel being fabricated has a 1” nozzle with wall thickness ¼” and it is welded to a 16” 300# B16.5 flange.  Is the WPS qualified to be used?  The answer is yes.

Tube to Tubesheet Joints:

Unfortunately ASME Section VIII Division 1 has not made the rules of QW-193 Tube to tubesheet tests mandatory, so typically the rules of QW-202.2 and QW-202.4 apply (see QW-202.6).  QW-202.2 provides some guidance for partial penetration groove welds but does not address dissimilar thicknesses.  QW-202.6 points the reader to QW-202.4.  QW-202.4 makes no distinction between partial and full penetration groove welds.  And the definition for groove welds does not exclude partial penetration joints.  Therefore the rules of QW-202.4 would apply to partial penetration groove welds for tube to tubesheet welds.  It can be difficult to make sense of the application of this method when qualifying tube to tubesheet welds.

Final Thoughts:

Properly understanding what the WPS(s) will be used for can aid in preparing your PQRs, minimizing your costs to get qualified on a new material, and save time by having WPSs that are qualified for the range of work you will be doing.

ASME IX Welding Requirements Part 1 – Procedure Qualification Record (PQR)

 

This week’s blog is the first of three parts regarding ASME IX welding requirements.  We will provide a brief description of how ASME IX is organized, used in referred codes, and then get into PQRs!

Before we get started a great resource for understanding ASME IX from an auditing point of view can be found here.  This document contains valuable information from the ASME IX committee regarding what they consider important for PQRs and WPSs.

https://cstools.asme.org/csconnect/FileUpload.cfm?View=yes&ID=46021

ASME IX Organization

ASME IX is organized in 4 parts. 

Part QG contains general requirements
o   It provides a scope description of ASME IX and definitions that apply to all material joining processes. 

Part QW contains the welding requirements
o   This will be the main focus of these parts in this blog, see below.

Part QB contains the brazing requirements
o   Brazing is broken into 4 articles detailing the requirements for brazing.

Part QF contains the plastic fusing requirements.
o   Plastic fusing is broken into 2 articles detailing the requirements for plastic fusing.
 

Part QW is sub-divided into 5 articles.

Article I – Welding general requirements

o   This article section defines the scope of this part, responsibilities in the organization, provides reference to test positions for groove and fillet welds located in article IV, and provides the types and purposes of tests and examinations used in the other articles for this part.

Article II – Welding Procedure Qualifications

o   This article defines the requirements for welding procedure specifications (WPS) and procedure qualification records.  It makes reference to article IV for essential and non-essential variables and testing.

Article III – Welding Performance Qualifications
o   This article deals with the requirements for welding performance qualifications (WPQ).  It makes reference to article IV for essential variables and testing related to welder qualifications.

Article IV – Welding Data

o   This article contains the welding data referenced in the other articles.  It contains the variables for welding procedure and welding performance qualifications,  base metal groupings, F and A numbers, qualification ranges for WPS and WPQ, positional reference figures, and etching testing requirements.

Article V – Standard Welding Procedure Specifications (SWPSs)

o   This article contains the requirements for use of Standard welding procedure specifications (SWPSS).

ASME IX is not a standalone code for use.  It is referenced is other construction codes such as ASME Section VIII Division 1, 2, and 3, and the ASME B31 codes (B31.3, B31.1, etc.).  Its implementation is typically through these construction codes which may add or remove specific requirements.  As a result the starting point for use of ASME IX is through the construction code of reference.

ASME IX Procedure Qualification Record (PQR)

What is a PQR?

The starting point for procedure qualification records is in Part QW-200.  The PQR is a record of variables recorded during the welding of the test coupons.  It also contains the test results of the tested specimens.  As stated in the introduction of ASME IX: 

“The purpose of the Procedure Qualification Record (PQR) is to ensure the material joining process proposed for construction is capable of producing joints having the required mechanical properties for the intended application. Personnel performing the material joining procedure qualification test shall be sufficiently skilled. The purpose of the procedure qualification test is to establish the mechanical properties of the joint produced by the material joining process and not the skill of the personnel using the material joining process. In addition, special consideration is given when toughness testing is required by other Sections of the Code. The toughness supplementary essential variables do not apply unless referenced by the construction codes.”. 

So essentially the purpose of the PQR is to prove the parameters you have used for a particular welding process on a particular material / welding metal group meets the minimum mechanical properties requirements in ASME IX.   Toughness testing is a separate issue.

How to prepare a PQR?

Once you have determined the welding process(s) a review the referenced construction codes the WPS you plan to create based on this PQR will be used in is needed. The construction codes may have restrictions, addition requirements or exemptions to ASME IX and you want to make sure you understand them before you start.  For example, ASME Section VIII Division 1 UG-84 has provisions that would make toughness testing mandatory for certain materials and thicknesses or UCS-56 or UW-2 has mandatory post weld heat treatment requirements.  Understanding these requirements before you create a PQR can reduce the number of procedure qualification tests that you will need.

Once you have determined if any requirements have been imposed by the construction code it is time to make reference to QW-250.  The tables in QW-250 make reference to all the essential, non-essential, special process and supplementary essential variables.  These variables are defined in QG-105.  As noted in QW-200.2, a PQR shall document all essential and when required supplementary essential variables.  This means that the PQR you create must as a minimum address the corresponding essential variables in the tables for the welding processes you have used in QW-250.  Supplementary essential variables become essential variables when toughness testing is required, typically from the referenced construction code and become non-essential variables when toughness testing is not required.  From a PQR standpoint non-essential variables are not required to be documented. 

Properly addressing essential variables can be issue as well.  For example stating N/A or not applicable to essential variables in a PQR document technically has not addressed the variable if it is applicable to your process.  The correct phrase would be not used, this clearly addresses the variable.

For all PQRs the base metal thickness range (QW-403.8) and P. No. (QW-403.11) are essential variables.   Section QW-451 provides qualification thickness ranges based on the test coupon that was used.  For example, a 0.375” test coupon will qualify the referenced WPS from 0.0625” to 0.75” in material thickness.  This thickness range can be affected by the welding process and other essential / supplementary essential variables referenced in QW-250, it is best to review all variables before you determine the thickness of your test coupon. 

An overlooked aspect of developing a PQR is nozzle or branch connection attachments.  Typically the thickness of the shell and nozzle of the welded joint will have different thicknesses.  Let’s say you qualify a WPS with a thickness range of 0.0625” to 0.75”, during fabrication you have to weld a nozzle with thickness of 0.2” to an ASME B16.5 blind flange that is 2” thick.  Can you do this?  The answer is it depends.  Section QW-202.4 details these requirements.

Base metals are assigned P-numbers to reduce the required number of welding procedures that are required.  For example P. No. 8, represents 304, 316, 321, 347, and more base metals.  Table QW-422 provides a complete list.  A great lookup resource is http://pnumbers.com/.

The filler metal selection is another important part of the PQR.  Reviewing ASME II Part C is a great resource, below is a table reference to easily review the correction SFA specification.

ASME SFA Specification Reference Table

Welding Process

Material Type

OFW

SMAW

GTAW
GMAW
PAW

FCAW

SAW

ESW

EGW

Brazing

Carbon Steel

SFA 5.2

SFA 5.1

SFA 5.18
SFA 5.36

SFA 5.20
SFA 5.36

SFA 5.17

SFA 5.25

SFA 5.26

SFA 5.8

Low-Alloy Steel

SFA 5.2

SFA 5.5

SFA 5.28
SFA 5.36

SFA 5.29
SFA 5.36

SFA 5.23

SFA 5.25

SFA 5.26

SFA 5.8

Stainless Steel

SFA 5.4

SFA 5.9
SFA 5.22

SFA 5.22

SFA 5.8

Cast Iron

SFA 5.15

SFA 5.15

SFA 5.15

SFA 5.8

Nickel & Nickel Alloys

SFA 5.11

SFA 5.14

SFA 5.34

SFA 5.8

Aluminum & Aluminum Alloys

SFA 5.3

SFA 5.10

SFA 5.8

Copper & Copper Alloys

SFA 5.6

SFA 5.7

SFA 5.8

Titanium & Titanium Alloys

SFA 5.16

SFA 5.8

Zirconium &Zirconium Alloys

SFA 5.24

SFA 5.8

Tungsten Electrodes

SFA 5.12

SFA 5.8

Brazing Alloys

SFA 5.8

Brazing Fluxes

SFA 5.31

Consumable Inserts

SFA 5.30

Shielding Gases

SFA 5.32

SFA 5.32

Surfacing Alloys

SFA 5.13
SFA 5.21

SFA 5.13
SFA 5.21

SFA 5.13
SFA 5.21

SFA 5.8

The guides in some of the referenced ASME SFA specification have great information concern the welding process, filler metal and appropriate gases to use.  Another great resource is the weld metal material suppliers shall as Lincoln Electric, Kobelco, Air Liquid, etc.

This post would be too large if we went into all the other essential and supplementary essential variables, the process would be to review the table is QW-250, lookup the variables and adequately address it in your PQR.

Once you have developed your PQR from a document standpoint, the next step is to determine the welding parameter ranges that work for your procedure.  The starting point can be from reference material such as the arc welding handbook or the weld metal material suppliers published documents.

Once satisfactory test pieces have been made, the destructive testing requirements in QW-202 would need to be followed.  If successful, the result would be included in the PQR and then signed and dated by the fabricator to certify the results.

Below are a few other important things to consider:

First, for Canada most provinces require registration of WPSs and PQRs.  It is a common misconception that the provinces certify these documents.  The provinces only register these procedures.  They may point out errors or mistakes but the responsibility is solely with the fabricator.  QW-200.2(b) highlights this as well by stating “…The PQR shall be certified accurate by the organization.  The organization may not subcontract the certification function. This certification is intended to be the organization's verification that the information in the PQR is a true record of the variables that were used during the welding of the test coupon and that the resulting tensile, bend, or macro (as required) test results are in compliance with Section IX….”. 

Also changes to PQRs are permitted as outlined in QW-200.2(c) (and the Introduction) but only editorial corrections or addenda, as long as an essential variable has not changed and the PQR can be revised.  Adding supplementary essential variable will require re-qualification.  Re-registering procedures with these changes is not practical or worth the cost.

Finally, the main focus of ASME IX PQR documents is to demonstrate mechanical properties for a given joining process.  There is no mention of corrosion resistance or microstructure.  For example no purging or nitrogen back purging can be used to weld 316 stainless steel.  The finished product would be acceptable for ASME IX requirements but not for the service it may be intended for.  Another example is duplex stainless steel.  Fabricators typically do not perform macro etching to determine the ratio of austenite to ferrite in the base metal, HAZ and weld metal.  This can have an affect on corrosion resistance.

 

ASME Section II Part D Allowable Stresses

ASME material allowable stresses are provided in ASME Section II Part D.  Table 1A represents allowable stress values for ferrous metals and are values that are to be used with ASME Section VIII Division 1 fabrication.  Table 1B represents allowable stress values for non-ferrous metals and are values that are to be used with ASME Section VIII Division 1 fabrication.  The basis for establishing their allowable stress values are described in Appendix 1.  Reproduced below is Table 1-100 providing the criteria for the basis of allowable stresses.

Favg = multiplier applied to average stress for rupture in 100 000 h. At 815°C and below, Favg = 0.67.

Above 815°C, it is determined from the slope of the log time‐to‐rupture versus log stress plot at 100 000 h such that log Favg = 1/n, but it may not exceed 0.67.

RT = ratio of the average temperature dependent trend curve value of tensile strength to the room temperature tensile strength

RY = ratio of the average temperature dependent trend curve value of yield strength to the room temperature yield strength

SC = average stress to produce a creep rate of 0.01%/1 000 h

SRavg = average stress to cause rupture at the end of 100 000 h

SRmin = minimum stress to cause rupture at the end of 100 000 h

ST = specified minimum tensile strength at room temperature, ksi

SY = specified minimum yield strength at room temperature, ksi

n = a negative number equal to Δ log time-to-rupture divided by Δ log stress at 100 000 h

 

 

Similarly for bolting Table 3 represents allowable stresses versus temperature for fasteners used in ASME Section VIII Division 1 work.  Appendix 2 in ASME Section II Part D is used to establish the allowable stress values.  It has been reproduced below.

 

 

It is worth noting that for bolting the factor of safety the ASME provides for the tensile strength and for tensile and yield strengths for bolting with strength enchancement by heat treatment is lower than wrought product at room temperature and above.

The allowable stress tables in ASME II Part D also provide the P-No. / Group No. for the material to be used in ASME IX, the maximum temperature limit the material is permitted to be used at, external pressure chart number reference and notes that relate to the use restrictions of that material.

Below are excel spreadsheets that contain all of ASME II-D Table 1A, 1B, and 3 allowable stress values for all material that have been published for the 2015 edition.

ASME II-D Table IA

ASME II-D Table 1B

ASME II-D Table 3

ASME Section VIII Division 1 Material Requirements

Material requirements in this division can be broken in 2 areas; general requirements that apply to all materials, and requirements for specific material types.

General requirements for material used for ASME Section VIII Division 1 work are listed below.  These requirements apply to all pressure vessels and pressure parts.

General Requirements
UG-1 - Scope UG-15- Product Specification
UG-4 - General UG-93 – Inspection of Material
UG-5 – Plate UG-120(c) – Partial Data Reports
UG-6 – Forgings UG-77 – Material Identification
UG-7 – Castings UG-78 – Repair of Defects in Materials
UG-8 – Pipe and Tubes UG-24-Castings
UG-10 - Material identified with or produced to a specification not permitted by this division, an material not fully identified UG-84 – Charpy Impact Tests
UG-11 - Prefabricated or preformed pressure parts furnished without a certification mark UG-85 – Heat Treatment
UG-12 - Bolts and Studs Appendix 43-3 Materials
UG-13 - Nuts and Washers Appendix 10-6 Material Control
UG-14- Rods and Bars

Requirements for specific material types are listed below.  Only more commonly used sections are shown here.  Material requirements for brazed material (Section UB), Cast Iron (Section UCI), cladded pressure vessels (Section UCL), Cast ductile Iron (UCD), and Impregnated Graphite (Section UIG) are not shown.  In addition to the general requirement these requirements must also be met.  

Carbon and Low Alloy Steel Material
USC-5- General UCS-11 – Nuts and Washers
UCS-6 – Steel Plates UCS-12 – Bars and Shapes
UCS-7 – Steel Forgings Table UCS-23
UCS-8 – Steel Castings UCS-66 – Materials (low-temperature)
UCS-9 – Steel Pipe and Tubes UCS-56(f)
UCS-10 - Bolt Materials
Nonferrous Material
UNF-5 – General UNF-14 – Bod, Bars, and Shapes
UNF-6 – Nonferrous Plate UNF-15 – Other Materials
UNF-7 – Forgings Table UNF-23.2
UNF-8 – Castings Table UNF-23.3
UNF-12 – Bolt Materials Table UNF-23.4
UNF-13 – Nuts and Washers Table UNF-23.5
High Alloy Steel Material
UHA-8 – Material UHA-13 – Nuts and Washers
UHA-11 – General Table UHA-23
UHA-12 – Bolt Materials UHA-51 – Impact Tests
Ferritic Steel Material with tensile properties enchanced by Heat Treatment
UHT-5 – Material Table UHT-23
UHT-18 - Nozzle UHT-28 - Structural attachments
Forgings
UF-5 – General UF-37 – Repair of Defects in Material
UF-6- Forgings UF-55 – Ultrasonic Examination
UF-7 – Forged Steel rolls used for corrugating paper machinery

 

An example of their use would be as follows:

We would like to use round bar stock to make a custom nozzle neck for a high temperature vessel made from SA-479 316H material.  Material ordered and received as A-479 2013 edition grade 316 / SA-479 2013 edition grade 316 UNS S31609.

From a design standpoint:

1.      First we review UG-4, no restrictions for the propose use. 

2.      We then review UG-14; UG-14(b) has a size restriction for hollow cylindrically shaped parts of NPS 4” (O.D. 4.5”).   If the nozzle neck is less than or equal to NPS 4” this would not be a problem.   If the nozzle neck is larger there is Code Case 2156-1 which provides additional requirements for hollow cylindrically shaped parts greater than NPS 4” but we will not go into it in this post.

3.      SA-479 316H is a high alloy material; reviewing the requirements in section UHA reveals no additional requirements.  But Table UHA-23 reveals that for SA-479 grade 316H is not listed as an accepted material.  This would imply SA-479 316H cannot be used for code construction and another material grade would need to be specified.

4.      If we review UG-15 this grade of material for this specification can be used following (a) to (e).

From a quality standpoint:

1.      Reviewing Appendix 43-3 & 10-6, this would imply that the ASME material specification year should be as approved for use in the edition specified for construction and documentation should be provided to verify this.  If you are building to the ASME 2015 edition, the material specification should be ordered to this.

2.      If the material specification is not to the edition year of the code specified for construction Section II Appendix II provides means to accept this material. As specified in Section II SA-479 2015, it is identical with A479-13b.

a.      As outlined in Section II Appendix II-200(a), Table II-200-1 lists acceptable ASTM editions that have been reconciled against the latest edition adopted by ASME.  For SA-479, ASTM A-479 87b through 13b has been accepted.  Since our material was made to ASTM A-479 2013 it would be acceptable for used in 2015 edition construction.  Since SA-479 and A-479 are identical no restrictions apply.

b.      As outlined in Section II Appendix II-200(b), the acceptable ASTM year date range of SA-479 2015 is ASTM A-479 87b through 13b.  For SA-479 2013, the reference ASTM A-479 is 2011 edition and it is identical.  This year is within the year range provided so therefore it would be acceptable.

c.      If the ASTM edition was greater than the acceptable year range provided the material would not be acceptable as outlined in II-200(c).   But as outlined in II-300 this material may also be used if evidence acceptable to the authorized inspector that the corresponding ASME specification requirements have been met.   UG-10(a) maybe used to provide the necessary evidence.

3.      UG-77 outlines the material identification requirements during fabrication

4.      UG-93 outlines the acceptance of material to be in compliance with a material specification of Section II.  Our material follows UG-93(a)(2), since the material specification requires material marking on each piece, if the markings are present the material is acceptable.