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API510 > ASME V > Flashcards

ASME V Flashcards

1
Q

Weld Joint Categories are….

A

Category is defined as the location of a weld joint in a vessel, but not a type of join

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2
Q

Category A:

A

These are Longitudinal, and spiral welded joints within the main shell, and circumferential welds connecting hemispherical heads to the main shell.

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3
Q

Category B:

A

These are circumferential welded joints within the main shell, and circumferential welds connecting formed heads besides hemispherical to main shells.

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4
Q

Category C:

A

These are welded joints connecting flanges to nozzles or shell components, and any welded joint connecting one side plate to another side plate of flat-sided vessel.

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5
Q

Category D:

A

These are welded joints connecting nozzles to main shells, heads, or flat-sided vessels.

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6
Q

Purpose of Categories is to understand

A

the joint efficiency to use for a weld, and the extent of NDE required.

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7
Q

The tensile strength of the weld should equal or exceed that of the ________ metals to be joined

A

base

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8
Q

When base metals of different strengths are to be joined by welding, the tensile strength of the weld metal should equal or exceed that of the ____of the two base metals.

A

weaker

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9
Q

When is full RT needed?

A
  1. lethal substances on all butt welds in SHELL/HEAD

2. all butt welds in SHELL/HEAD >1.5” or based on thickness / material

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10
Q

When is full RT needed?

A
  1. lethal substances on all butt welds in SHELL/HEAD
  2. all butt welds in SHELL/HEAD >1.5” or based on thickness / material
  3. unfired steam boilers
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11
Q

What is spot radiography needed?

A
  1. is when the vessel is not in lethal service, and the welded joint is not examined 100%
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12
Q

When is full RT needed? (RT1)

A
  1. lethal substances on all butt welds in SHELL/HEAD
  2. all butt welds in SHELL/HEAD >1.5” or based on thickness / material
  3. unfired steam boilers
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13
Q

What is spot radiography needed? (RT3)

A
  1. is when the vessel is not in lethal service, and the welded joint is not examined 100%
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14
Q

What is spot radiography needed? (RT3)

A
  1. is when the vessel is not in lethal service, and the welded joint is not examined 100%. A 50 ft (15 m) increments of the weld, for example, is represented by one spot examination.
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15
Q

RT2?

A
  1. vessel is not used for lethal substances, the code allows full RT to be performed on all longitudinal joints (Category A & D),
    AND
  2. spot RT performed on circumferential joints (Category B & C).
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16
Q

No Radiography RT4

A

required for vessels or vessel parts designed for external pressure, or if it won’t be used for lethal substances.

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17
Q

Joint efficiency E is a measure of the (2)

A
  1. quality of a weld joint, or

2. how closely the weld approaches the strength of seamless material.

18
Q

stress calculation for a seamless vessel (no longitudinal weld) or the thickness of seamless heads with a Type 1 circumferential weld, only two conditions apply:

A 
E = 1 if Spot RT is performed on the circumferential weld.
E = 0.85 if No RT is performed on the circumferential weld
19
Q

List the static head/pressure conversion factor

A

0.433 psi/ft)

20
Q

List the static head/pressure conversion factor

A

0.433 psi/ft)

21
Q

Rules for the design of shells and tubes under external pressure given in this Division are limited to cylindrical shells, with or without (3)

A

stiffening rings, tubes, and spherical shells.

22
Q

CUI susceptible range for CS/SS/duplex

A

a) 10 °F (–12 °C) and 350 °F (177 °C) for carbon and low alloy steels,
b) 140 °F (60 °C) and 350 °F (177 °C) for austenitic stainless steels,
c) 280 °F (138 °C) and 350 °F (177 °C) for duplex stainless steels.

23
Q

Inspection for CUI shall be considered for (3)

A
  1. externally insulated vessels and
  2. those that are in intermittent service
  3. operate at temperatures
24
Q

On vessels, the most susceptible areas for CUI (7)

A

a) above insulation or stiffening rings;
b) nozzles and manways;
c) other penetrations (e.g. ladder clips, pipe supports);
d) damaged insulation with areas of potential water ingress;
e) areas with failed insulation caulking;
f) top and bottom heads;
g) other areas that tend to trap water.

25
Q

Considerations on the need for insulation removal are not limited to but include: (8)

A

a) consequences of CUI leakage;
b) history of CUI for the vessel or comparable equipment;
c) visual condition of the external covering and insulation;
d) evidence of fluid leakage (e.g. stains);
e) equipment in intermittent service;
f) condition/age of the vessel coating under insulation, if applicable;
g) potential for the type of insulation to absorb/hold more water (e.g. calcium silicate versus cellular glass);
h) ability to apply specialized NDE that can effectively locate CUI without insulation removal.

26
Q

the minimum thickness at a CML can be located by

A

ultrasonic measurements or radiography.

27
Q

when localized corrosion is expected or a

concern, it is important that examinations are conducted using

A

scanning methods such as profile radiography, scanning ultrasonic techniques, and/or other suitable NDE techniques that will reveal the scope and extent of localized corrosion.

28
Q

Ultrasonic scanning or radiographic profile techniques are preferred where corrosion (2)

A

is localized or the

remaining thickness is approaching the required thickness.

29
Q

When a code hydrostatic pressure test is required, the minimum test pressure should be in accordance with the rules of the applicable code

A

Test Pressure in psig (MPa) = 1.5 MAWP × (Stest temp/Sdesign temp), prior to 1999 addendum

Test Pressure in psig (MPa) = 1.3 MAWP × (Stest temp/Sdesign temp), 1999 addendum and later

30
Q

When a noncode related pressure test (leak/tightness test) is performed after repairs, the test pressure may
be conducted at pressures determined

A

by the owner/user.

31
Q

A close visual inspection of pressure vessel components should not be performed until the vessel pressure is

A

at or below the MAWP.

32
Q

To minimize the risk of brittle fracture during a pressure test, the metal temperature should be maintained at

A

least 30 °F (17 °C) above the MDMT or MAT for vessels that are more than 2 in. (5 cm) thick and

10 °F (6 °C) above the MDMT or MAT for vessels that have a thickness of 2 in. (5 cm) or less.

33
Q

pressure test temp should not exceed?

A

120F

34
Q

During repairs or alterations of pressure vessels, the inspector shall verify that all new materials

A

(including carbon steel as well as all alloys) are in compliance with the specifications

35
Q

Crack-like flaws and environmental cracking shall be assessed by an

A

engineer and/or corrosion specialist.

36
Q

Substituting NDE procedures for a pressure test after an alteration or major repair may be done only after the

A

engineer and inspector have approved.

37
Q

preferential weld corrosion should be accessed

A

inspector

38
Q

If the service conditions of a vessel are changed the inspection intervals shall be

A

established for the new service conditions.

39
Q

f both the ownership and the location of a vessel are changed, the vessel shall be

A

internally and externally

inspected before it is reused.

40
Q

External inspection intervals for vessels in noncontinuous service are the

A

same as for vessels in continuous service because the external environment does not change during noncontinuous service.

41
Q

for pressure vessels that are in noncontinuous service, the interval is based on the number of years of

A

actual service (vessel in operation) instead of calendar years

API510 (6 decks)

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