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api 570 > API 574 chap 4-5 > Flashcards

API 574 chap 4-5 Flashcards

1
Q

The two most common carbon steel piping materials used in the petrochemical industry are

A

ASTM A53/A53M and ASTM A106

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2
Q

Piping of a nominal size larger _______ is usually made by rolling plates to size and welding the seams

A

than 16 in. (406 mm)

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3
Q

Steel and alloy piping are manufactured to standard dimensions in nominal pipe sizes (NPSs) up to?

A

up to 48 in.

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4
Q

Centrifugally cast piping can be cast then machined to _______ thickness.

A

any desired

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5
Q

Pipe wall thicknesses are designated as pipe schedules in NPSs up 2?

A

up to 36 in.

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6
Q

The size denotes the actual OD for NPSs equal to or greater

A

than 14 in. (356 mm).

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7
Q

Allowable tolerances in pipe diameter differ

A

from one piping material to another

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8
Q

The actual thickness of seamless piping can vary from its nominal thickness by a manufacturing tolerance of as much

A

as 12.5 %

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9
Q

The under tolerance for welded piping is

A

(-) 0.01 in. (0.25 mm).

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10
Q

Cast piping has a thickness tolerance of +/-

A

+1/16 in. (1.6 mm) and –0 in. (0 mm),

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11
Q

Cast iron piping is generally used ___and not recommend for__-?

A

for nonhazardous service, such as water; / for pressurized hydrocarbon service because of its brittle nature.

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12
Q

FRP design/testing code ? (2)

A
  1. ASME B31.3, Chapter VII covers design requirements for nonmetallic piping.
  2. American Water Works Association (AWWA) is an organization that also provides guidance on FRP pipe design and testing.
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13
Q

limitation of FRP codes?

A

do not offer guidance as to the right choice of corrosion barriers, resins, fabricating methods, and joint systems for a particular application.

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14
Q

What is recommended for user to do if looking to use FRP?

A

consider other sources such as resin and pipe manufacturers for guidance on their particular application.

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15
Q

many of the failures in FRP piping _____ practices

A

are related to poor construction practice

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16
Q

FRP pipe can experience _______over time if not adequately protected.

A

ultraviolet (UV) degradation

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17
Q

What table can be used as a guide to identify liner and structure imperfections that are common in FRP laminates. ?

A

ASME RTP-1, Table 6-1

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18
Q

FRP piping systems commonly called “commodity piping” are manufactured for a variety of services and are sold as products with a predetermined

A

design, resin, corrosion barrier, and structure.

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19
Q

Nipples are normally what length

A

6 in. (152 mm) or less in length

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20
Q

Secondary piping is normally isolated ? and examples?

A

from the main process lines by closed valves and can be used for such functions as sample taps.

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21
Q

Auxiliary piping is normally open ? and examples

A

to service but can be isolated from the primary process.

Examples include flush lines, instrument piping, analyzer piping, lubrication, and seal oil piping for rotating equipment.

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22
Q

Tubing stated size is the ____except for steam tracing and that size is _______less___?

A

actual OD rather than NPS. /s ize designation is 1/8 in. (3.2 mm) less than the actual OD.

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23
Q

A commonly used tubing material is the

A

18Cr-8Ni family of stainless steels, such as Types 304 and 316.

24
Q

Types 304 and 316 they are susceptible to

A

pitting and chloride stress corrosion cracking (CSCC)

25
Q

gates valves is not generally designed for

A

regulating fluid flow

26
Q

what does gate valve called a full-ported valve mean?

A

have port openings that are approximately the same size as the valve end openings

27
Q

another name for gates valves? (full port only)

A

block valves

28
Q

Reduced port gate valves have port openings that

A

are smaller than the end openings

29
Q

globe valve, which is commonly used to

A

regulate fluid flow,

30
Q

globe valve body contains _____ move ____ disc axis and contacts ____

A

circular disc that moves parallel to the disc axis and contacts the seat

31
Q

For globe valve The seating surface can be (2)

A

flat or tapered.

32
Q

For globe valve and for fine-throttling service, a very _____seat can be used; this particular type of globe valve is referred to as a _____

A

steep tapered / needle valve.

33
Q

plug valves (4)

A
  1. function as block vale to close off flow
  2. valve is closed by turning the plug 1/4, right angles to the opening in the valve body.
  3. operated via gear or turning a wrench
  4. lubricated or non lubricated
34
Q

ball valve (4)

A
  1. 1/4” turns
  2. spherical not tapered or cylindrical like plugs
  3. suited for quick on/off or bubble tight services
  4. equipment with elastomeric seating material that provide good shut off.
35
Q

diaphragm valves (2)

A
  1. used for corrosive service below 250F, where leak tight valve is needed
  2. function as a closure and a seal
36
Q

butterfly valves (4)

A
  1. 1/4” turn
  2. often used for low pressure service for coarse flow control
  3. large BV are mechanically operated
  4. tight shut off in low / high pressure services
37
Q

slide valves (5)

A
  1. used in erosive or high temp service
  2. flat plate that slides against a seat
  3. does not make a tight shut off
  4. typically used to control fluidized catalyst flow
  5. expose to high wear from the catalyst
38
Q

types of fittings (2)

A
  1. metallic

2. frp

39
Q

ASME B16.5 covers flanges of various materials

A

through a NPS of 24 in.

40
Q

ASME B16.47 covers steel flanges that range from

A

NPS 26 through NPS 60.

41
Q

type of expansion joints (2)

A

1 . metallic bellows - high-temperature services
2. fabric joint - flue gas services at low pressure and where temperatures do not exceed the rating of the fabric material.

42
Q

flexible houses purpose(2)

A
  1. transfer hydrocarbons and other process fluids on a temporary basis to facilitate turnaround activities
  2. mitigate the effects of thermal expansion, vibration, or movement during normal operations
43
Q

what require special connections/joining methods due to inherent design characteristics (2)

A

cast iron piping and thin wall tubing

44
Q

Threaded joints are generally limited to (2)

A
  1. auxiliary piping in noncritical service

2. that has a nominal size of 2 in. (51 mm) or smaller.

45
Q

why A large number of piping failures occur at pipe-to-pipe welded branch connections?

A
  1. branch connections are often subject to higher-than-normal stresses caused by excessive structural loadings from unsupported valves or piping, vibration, thermal expansion, or other configurations. ( tri-axial stresses )
46
Q

how to minimize failures at welding branch connections? (2)

A
  1. Use of Weld-o-lets

2. forged piping tee

47
Q

Some common joint designs in FRP pipe systems include (4)

A
  1. bell and spigot,
  2. butt and wrap,
  3. taper-taper, and
  4. flange-flange
48
Q

Bell and Spigot/Taper-taper need proper…(3)

A
  1. Proper surface preparation, insertion, and adequate adhesive are the key to make these types of joints
49
Q

Butt and Wrap

A

butting plain end pipe together and applying layers of resin and fiber reinforcement layers around the joint.

50
Q

Flange joints require proper (2)

A

gaskets and torques.

51
Q

Tubing size is actually

A

OD size not NPS

52
Q

socket weld are generally used for what size ?

A

2” and smaller

53
Q

OSHA 1910.119 mandates that?

A

piping be isnpected to a code or standard such as aPI570

54
Q

plug and ball valves function as

A

block valve

55
Q

what is not normally used in in inspection for CUI

A

VI

api 570 (17 decks)

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