API 570 Chap 8

Question 1

ASME 31.3 is written for

Answer 1

design and construction of piping systems.

Question 2

design, welding, examination, and materials also can be applied in the (4)

Answer 2

inspection, rerating, repair, and alteration of operating piping systems.

Question 3

When ASME B31.3 cannot be followed because of its new construction coverage the piping engineer or inspector shall be guided by

Answer 3

API 570 in lieu of strict conformity

to ASME B31.3.

Question 4

All repair and alteration work shall be done by a ______ and shall be authorized by the _______

Answer 4

repair organization / inspector prior to its commencement

Question 5

The inspector will designate any inspection hold points required during _____

Answer 5

the repair or alteration sequence.

Question 6

All proposed methods of design, execution, materials, welding procedures, examination, and testing shall be approved by the (2)

Answer 6

inspector or by the piping engineer

Question 7

approval of on-stream welding is required from

Answer 7

owner/user

Question 8

Welding repairs of cracks that occurred in-service should not be attempted without prior consultation with the piping engineer in order to

Answer 8

identify and correct the cause of the cracking.

Question 9

The inspector shall approve all repair and alteration work at …..

Answer 9

designated hold points and after the repairs and alterations have been satisfactorily completed in accordance with the requirements of API 570

Question 10

The design of temporary enclosures and repairs shall be approved

Answer 10

by the piping engineer.

Question 11

Longitudinal cracks shall not be repaired with a sleeve unless

Answer 11

the piping engineer has determined that cracks would not be expected to propagate from under the sleeve.

Question 12

what are consider temporary repairs? (3)

Answer 12

1. on-stream, a full encirclement welded split sleeve
2. box-type enclosure
3. fillet patch

Question 13

when can a temporary repair may be made by fillet welding a properly designed split coupling or plate patch over the pitted or locally thinned area (2)

Answer 13

If the repair area is localized and the SMYS (Specified Minimum Yield Strength) of the pipe is not more than 40,000 psi (275,800 kPa), and a Fitness-for-Service analysis shows it is acceptable

Question 14

A fillet-welded patch shall not be installed

Answer 14

on top of an existing fillet-welded patch.

Question 15

when installing a fillet-welded patch adjacent to an existing fillet-welded patch, the minimum distance between the toe of the fillet weld shall not be less than

Answer 15

d = 4 (Rt)^.5

d is the minimum distance between the toes of fillet welds of adjacent fillet weld attachments, in inches
(millimeters);
R is the inside radius in inches (millimeters);
t is the minimum required thickness of the fillet-welded patch in inches (millimeters).

Question 16

Temporary repairs should be removed and replaced with a suitable permanent repair at the next available maintenance opportunity. Temporary repairs may remain in place for a longer period of time only if approved and documented by who?

Answer 16

piping engineer.

Question 17

Any leak in a Class 1 service or where a risk ranking is determined to be high, shall be first reviewed

Answer 17

by a piping engineer to determine if the work can be safely performed while the system remains on stream.

Question 18

For minor leaks and thinning below Tmin, properly designed enclosures may be welded over the leak or thin piping while the piping system is in-service provided…..

Answer 18

the inspector is satisfied that adequate thickness remains in the actual location of the proposed weld and HAZ

Question 19

Permanent repairs types?(2)

Answer 19

1. flush/insert patches

2. overlay/metal

Question 20

steps to perform overlay/metal build up? (2 steps)

Answer 20

Surface irregularities and contamination shall be removed and Appropriate NDE methods shall be applied afterwards

Question 21

Insert patches (flush patches) may be used to repair damaged or corroded areas if the following requirements are met: (3)

Answer 21

a) full-penetration groove welds are provided;
b) for Class 1 and Class 2 piping systems, the welds shall be 100 % radiographed or ultrasonically tested
c) patches may be any shape but shall have rounded corners [1 in. (25 mm) minimum radius]

Question 22

injection fittings on valves to seal fugitive (LDAR) emissions from valve stem seal are consider as temp repairs? (Y/N)

Answer 22

No, they are not considered to be temporary repairs. Their removal or valve replacement is at the discretion of the owner operator

Question 23

Temporary repairs of locally thinned sections or circumferential linear defects may be made on-stream by installing a

Answer 23

properly designed and applied enclosure (e.g. bolted clamp, nonmetallic composite wrap, metallic and epoxy wraps, or other non-welded applied temporary repair).

Question 24

Temp repairs design shall consider what type of loads?

Answer 24

of axial thrust loads of the piping

Question 25

Procedures that include leak sealing fluids “pumping”) for process piping should be reviewed for acceptance by who?

Answer 25

by the inspector or piping engineer.

Question 26

What consideration to be made for sealing fluids? (4

Answer 26

1. consideration the compatibility of the sealant with the leaking material;
2. the pumping pressure on the clamp (especially when re-pumping) and any resulting crushing forces;
3. and; the risk of sealant affecting downstream flow meters, pressure relieving devices, or machinery; the risk of subsequent leakage at bolt threads causing corrosion or stress corrosion cracking of bolts;
4. and the number of times the seal area is repumped

Question 27

All repair and alteration welding shall be done in accordance with the principles of

Answer 27

ASME B31.3 or the code to which the piping system was built.

Question 28

Any welding conducted on piping components in operation shall be done in accordance with what code

Answer 28

with API 2201. (Hot tapping)

Question 29

The repair organization shall use welders and welding procedures qualified in

Answer 29

ASME B31.3 or the code to which the piping system was built.

Question 30

PWHT of piping system repairs or alterations should be made using the applicable requirements of

Answer 30

ASME B31.3 or the code to which the piping system was built.

Question 31

Re-rating piping systems by changing the temperature rating or the MAWP may be done only after all of the following requirements are met (10)

Answer 31

a) Calculations are performed by the piping engineer or the inspector.
b) All re-ratings shall be established in accordance with the requirements of the code to which the piping system was built or by computation using the appropriate methods in the latest edition of the applicable code or other industry standards approved by a SDO (e.g. API 579-1/ASME FFS-1).
c) Current inspection records verify that the piping system is satisfactory for the proposed service conditions and that the appropriate corrosion allowance is provided.
d) Re-rated piping systems shall be leak tested in accordance with the code to which the piping system was built or the latest edition of the applicable code for the new service conditions, unless one of the following is true.
1) Documented records indicate a previous leak test was performed at greater than or equal to the test pressure for the new condition.
2) The re-rate is an increase in the rating temperature that does not affect allowable tensile stress.
3) The piping integrity is confirmed by appropriate nondestructive inspection techniques in lieu of testing after
consultation with the inspector and piping engineer.
e) The piping system is checked to affirm that the required pressure relieving devices are present, are set at the
appropriate pressure, and have the appropriate capacity at set pressure.
f) The piping system re-rating is acceptable to the inspector or piping engineer.
g) All piping components in the system (such as valves, flanges, bolts, gaskets, packing, and expansion joints) are adequate for the new combination of pressure and temperature.
h) Piping flexibility is adequate for design temperature changes.
i) Appropriate engineering records are updated.
j) A decrease in minimum operating temperature is justified by impact test results, if required by the applicable code

Question 32

Pressure tests are normally required

Answer 32

after alterations and major repairs.

Question 33

When a pressure test is not necessary or practical, _______, and only after consulting with______(2)__

Answer 33

NDE shall be utilized in lieu of a pressure test, with the inspector and the piping engineer

Question 34

For existing insulated lines that are being pressure tested after repairs, re-rating, or alterations, it is not necessary to

Answer 34

strip insulation on all existing welds.

Question 35

What test can be substituted for insulation stripping when the risks associated with leak under the insulation are acceptable.

Answer 35

Pressure tests with longer hold times and observations of pressure gauges can
be

Question 36

When it is NOT practical to perform a pressure test of a final closure weld that joins a new or replacement section of piping to an existing system, all of the following requirements shall be satisfied (4)

Answer 36

a)welds are examined with appropriate NDE, as specified by the authorized piping inspector.
b) The closure weld is a weld between any pipe or standard piping component of equal diameter and thickness, axially aligned (not miter cut), and of equivalent materials. Where slip-on flanges or socket weld fittings are permitted by the specification for the piping system, they may be used within the limitations of that specification.
Acceptable alternatives are:
1) slip-on flanges for design cases up to Class 150 and 500 °F (260 °C); and
2) socket-welded fittings for sizes NPS 2 or less and design cases up to 500 °F (260 °C). A spacer designed for socket welding or some other means shall be used to establish a minimum 1/16 in. (1.6 mm) gap. Socket welds shall be per ASME B31.3 and shall be a minimum of two passes.
c) Any final closure butt weld shall be of 100 % RT; or angle beam ultrasonic flaw detection may be used, provided the appropriate acceptance criteria have been established.
d) MT or PT shall be performed on the root pass and the completed weld for butt welds and on the completed weld for fillet welds.

Question 37

Fillet-welded patches shall be designed by who?

Answer 37

by the piping engineer

Question 38

Different components in the same piping system or circuit may have different design temperatures. In establishing the design temperature, consideration shall be given to (4)

Answer 38

to process fluid temperatures, ambient temperatures, heating and cooling media temperatures, and insulation

Question 39

A patch may be applied to the external surfaces of piping, meets either of the following requirements: (2)

Answer 39

a) the proposed patch provides design strength equivalent to a reinforced opening designed
b) the proposed patch is designed to absorb the membrane strain of the part in a manner that is in accordance with the principles of the applicable code, if the following criteria are met:
1) the allowable membrane stress is not exceeded in the piping part or the patch,
2) the strain in the patch does not result in fillet weld stresses exceeding allowable stresses for such welds,
3) an overlay patch shall have rounded corners (see Annex C)

Question 40

8.23

Answer 40

not finished

Question 41

A preheat of ____F_or higher is maintained during welding

Answer 41

300F