Closed Book 2 Flashcards by Jamo Quin

Sulfidisation results in

General / local metal loss

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Damage mechanism that doesn’t result in surface connected cracking

creep

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Minimum pressure test value for vessels re-rated to ASME VIII div 1 prior to the 1999 Addendum =

1.5 X MAWP X (S test / S Design)
Corrected for temperature

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In-service preferential weld corrosion found, the inspector should

examine other welds in the vessel

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Flanges pumped full of sealant may leak at the bolts causing

caustic cracking

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RBI concludes the frequency of an internal / on-stream inspection is 20 years, what must the RBI include

considerations of PRV Problems

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when entry is physically impossible, an on-stream inspection may be done instead of an internal inspection

purely at the discretion of the inspector

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Welders need to re-qualify if they havent welded in X months

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Who would need to approve repairs at a crack on the nozzle of a heat exchanger

engineer

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who would need to authorisetemporary fillet weld patch repairs for a crack found in the nozzle of a heat exchanger

inspector & engineer

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If unable to RT a category A weld in a vessel which was originally RT’d, what must happen

the NDE method must be approved by the PVE & Inspector prior to the repair

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Environmental cracking of ferrous materials in our industry hasn’t been cause by

naphthenic acid cracking

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Who would you need to consult if necessary to remove deposits / linings for an inspection

corrosion specialist

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CDW should not be used if

PWHT is required for process reasons

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What best tdescribed the API 510 Philosophy of PSV internals

Performance under particular service conditions

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Process vessel is lined with sand/cement with mesh backing, what is the most practical way do find disbonding?

Hammer testing

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Toughness is described as

the ability to absorb energy & deform plastically before fracturing

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If there has not been RT done on a vessel, assumed joint efficiencies are

0.7 for Type 1
0.65 for Type 2
0.85 for seamless shells, heads & nozzles

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When should UT equipment be recalibrated

start & end of each use

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When shouldn’t UT equipment be calibrated/recalibrated?

you believe the equipment is faulty

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an examination point is

a location at which a replication may be performed

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cyclic loads in an air receiver is caused by

Resonance

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MAT/MDMT

the lowest permissible metal temperature for a given material at a specified thickness based on its resistance to brittle fracture. It is generally the minimum temperature at which a significant load can be applied to a pressure vessel as defined in the applicable construction code

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What should be considered before a flange is repumped (for the second time)

UT of the bolts

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Corrosion allowance for a vessel shell is

additional material to allow for metal loss in service

People not directly involved in a pressure test

should stay well clear until ALL pressure is released

Most useful inspection method is

Visual

A welding operator is someone who

operates machine or automatic welding equipment

Low carbon steel fractionation column connected to 300 series SS running at 500F should be checked for

Polythionic SCC

CUI of low carbon steels usually causes

localised corrosion

Required thickness takes into account

pressure, mechanical and structural considerations (wind loading etc)

Beam impact test specimens should be XX Long

2.165" or 55 mm

IOWs should be implemented to

Help create new inspection plans

To ensure that 510 inspection code is being followed, periodic audits should be done on

the owner - operator

Approval of repairs

inspector OR engineer

Authorisation of repairs

inspector (and engineer for division 2 vessels)

Inspector should consult with WHO, when finding crack-like flaws, enviro cracking or preferential weld corrosion?

engineer or corrosion specialist ( inspector AND one of these two)

If insulation can't be taken off a vessel

UT readings done internally are an alternative

Magnetising equipment should be calibrated

12 monthly, or after any damage

Caustic SCC gets worse with

increase in temperature

Usual cause of bulging of a vessel refractory insulation is

corrosion

a vessel running at 225C should be

inspected every 5 years (it is above CUI susceptibility range)

vessel in acidic environment has hydrogen blisters below the water line, how should these be inspected

UTT

Pilot operated safety valves should not be used when

Monomer services that may lead to polymer formation and fouling

Design temperature is -

temperature used in design as per applicable construction code

Non-penetrating nozzles over corroded areas with pipe cap can be permanent if

it complies with original construction code

Who is responsible to ensure that NDE techs are qualified

Inspector

Separation / gap at root of work pieces is called

root opening

forward acting scored tension rupture disks

operate predictably near burst pressure

Hole type IQIs have how many holes?

PRV chatter is likely caused by

lengthy piping to inlet valve

Hydraulic pressure test does not show

fitness for service - i guess this means it doesnt mean whichever vessel it is is good for anything? maybe?

Pressure tests indicate

integrity & tightness, also can result in beneficial stress redistribution

bend tests are used to see how XXX a material is

ductile

if CDW is used in lieu of PWHT what must occur?

a metallurgical review

the first internal inspection of a buried vessel

should primarily determine the external surface condition

IOWs are implemented by

owner/operator alone

if a vessel is made of an unknown material, if ASME VIII UG-10(c) is not used

assume the material is SA-283 Gr C

Changes in trends of IOWs should be brought to

the engineer or inspector

Damage found during initial inspection, the inspector should

recommend repairs

all repair and alteration work shall be authorised by

inspector before work is started by a repair organisation

authorisation for alterations to pressure vessels and for repairs to PVs that comply with ASME VIII Div 2 may not be initiated until

an engineer has also authorised it (as well as the inspector)

Before any repairs are performed, all proposed methods of design, execution, materials, welding procedures, NDE & testing shall be approved by

the inspector or engineer

for alterations, major repairs and temporary repairs approval by

engineer and inspector is required

approval of all specified repair and alteration work at designated hold points and after completion of work shall be done by

inspector

for all nozzle installations, approval by

engineer

Relief valves are used for

non-compressible fluids (liquids)

Safety valves are used for

compressible fluids (steam/air)

Safety valves usually have a

huddling chamber, they are high lift, pop-action

Safety relief valves are used for

non-compressible & compressible fluids

Set pressure on valves must be

at MAWP or less

CDTP is

cold differential test pressure, test pressure on bench to account for back pressure & temperature

CDTP tolerance is

-/+ 3% for set pressure greater than 70PSI

Springs of valves are usually damaged by

primarily - corrosion secondarily - SCC

Seats of valves are susceptible to

wire draw

if a valve passes or fails tests it should be

taken apart, cleaned and checked for damage

Approvals are

high level documentation, procedure & design

Repair, approval by

Inspector OR engineer

Temp repair approval by

inspector AND engineer

Major repair approval by

inspector AND engineer

for nozzles, approval by

engineer

alterations require approval by

inspector & engineer

Authorisations are

on-site go ahead verifications, hold points

Repairs authorised by

inspector (engineer for Div 2)

Temp repairs authorised by

inspector

Major repairs authorised by

inspector

Alterations authorised by

inspector AND engineer