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2025 NBIC Part 3, Figure S10.1

Print Date: 7/9/2025 2:30:16 PM

Jurisdictional Requirements

Does the Customer or Jurisdiction require work to be processed as an alteration?

ALTERATION
Work being performed may be considered a repair subject to the rules of NBIC Part 3, 3.3 (Repairs) and 3.4 (Alterations) with concurrence from the jurisdictional authority.

NBIC Part 3, 3.4 (Alterations) Considerations

3.4.4. a) Does work result in an increase in the MAWP (internal or external) or temperature of a pressure-retaining item (PRI) regardless of whether or not a physical change was made to the PRI?

ALTERATION
CONTINUE TO 3.4.4 b)

3.4.4. b) Does work result in an increase in minimum temperature?

ALTERATION
CONTINUE TO 3.4.4 c)

3.4.4. c) Have new nozzles or openings been added in the boiler or pressure vessel, and are they of the size and connection type that require reinforcement and strength calculations by the original code of construction?

CONTINUE TO 3.3.3 j)
CONTINUE TO 3.4.4 j)

3.3.3. j) Is the new nozzle different than one in the original design or located in a different part of the vessel or closer than three times its diameter from another nozzle?

ALTERATION
CONTINUE TO 3.4.4 j)

3.4.4. j) For plate heat exchangers, in addition to the applicable examples of alterations above, do any of the changes result in a change from what is listed on the MDR or described on the Original Equipment Manufacturer's (OEM) drawing?

  1. For heat transfer plates:
    1. A change in material grade or nominal thickness;
    2. A reduction in number beyond any minimum, or when no minimum is specified;
    3. An increase in number beyond any maximum, or when no maximum is specified;
    4. A change in model type.
  2. Any change in material whether described in 3.3.3 s) or as described in 3.4.4 g):
    1. A change in connection bolt or frame compression bolt diameter or material grade;
    2. A change in material grade or nominal dimensions of any end plates or nozzles.
ALTERATION
CONTINUE TO 3.4.4 d)

3.4.4. d) Does the work result in a change in dimension or contour that decreases the pressure retaining capability or the PRI? For example: replacing a hemispherical head with a flat head.

CONTINUE TO NEXT QUESTION
CONTINUE TO NEXT QUESTION

Does the change in dimension or contour encroach on the reinforcement area needed by an opening or support?

ALTERATION
CONTINUE TO NEXT QUESTION

Does the change in dimension or contour result in thinner thickness, reduction in flow or area, or change (worse) in performance of the PRI greater than allowed by the original code of construction?

ALTERATION
CONTINUE TO 3.4.4 e)

3.4.4. e) For a boiler, heat recovery steam generator (HRSG), or PRI, does the work result in an increase in the steaming capacity by means of increasing the heating surface, total heat input, firing rate, adjustment or other modification to the primary or auxiliary heat source, resulting in the steaming capacity exceeding the original manufacturer's minimum required relieving capacity (MRRC) as described on the nameplate and/or manufcaturer's data report or latest R-2 Alteration report?

ALTERATION
CONTINUE TO 3.4.4 f)

3.4.4. f) Does the change introduce a pressurized jacket to the pressure vessel?

ALTERATION
CONTINUE TO 3.4.4 g)

3.4.4. g) Does the work result in a change in a replacement part or PRI with a material of a different allowable stress or nominal composition from that used in the original design?

 
CONTINUE TO 3.3.3 s)

3.3.3. s) Does the new material have an allowable stress less than that used in the original design? Or does the replacement material or material used in the replacement part have an allowable stress lower than was required in the original code of construction under which the vessel was built? Or is the minimum required thickness less than the thickness stated on the original manufacturer's data report?

ALTERATION
CONTINUE TO 3.4.4 h)

3.4.4. h) Does the work result in the addition of a bracket or an increase in loading on an existing bracket that affects the design of the PRI to which it is attached?

ALTERATION
CONTINUE TO 3.4.4 i)

3.4.4. i) Does the work result in the replacement of a pressure relief device (PRD) as a result of work completed on a PRI that changes the resultant item capacity to exceed the MRRC required by the original code of construction as described on the original manufacturer's data report?

ALTERATION
CONTINUE TO 3.4.4 k)

3.4.4. k) Was postweld heat treatment performed where none was originally performed on the PRI?

ALTERATION
CONTINUE TO 3.4.4 l)

3.4.4. l) Does the work result in the addition of a welded leak box?

ALTERATION
Work performed may be considered a repair subject to the rules in NBIC Part 3, 3.3 (Repairs) and 3.4 (Alterations)

*Note: All repairs and alterations of existing boilers and pressure-retaining items should consider the changes made, and edition used, in any alterations done to the boiler after the original construction.