B16.5

Question 1

B16.5 applies to range of NPS and classes?

Answer 1

1. 1/2” - 24”

2. Class 150-2500

Question 2

B16.5 applies to type of requirements? (7)

Answer 2

-Pressure/Temperature Ratings 
• Markings
• Materials •
 Testing
• Dimensions 
• Designating openings
• Tolerances

Question 3

what governs when two different flange ratings are joined

Answer 3

lower rated that governs

Question 4

develop leakage problems unless care is taken to avoid imposing severe external loads, for what 2 temp and respective class?

Answer 4

Above 400°F - for Class 150

Above 750°F - all others

Question 5

Hydro requirements

Answer 5

Normal limit is 1.5 x the 100°F pressure rating of the flange rounded off to next highest 25 psi.

Question 6

Ratings for WN Flanges are based on the hubs at the ,

Answer 6

weld end - which is calculated as pipe with a

wall thickness

Question 7

All flanges and fittings shall be marked with: (7)

Answer 7

• Manufacturers name or trademark
• Material Specification (ASTM)
• Rating Class
• “B16” or “B16.5”
• Size
• “R” - (Ring Joint Flanges only)
• Temperature (optional)

Question 8

Three kinds of bolting are given:

Answer 8

1. High Strength A193 B7 or above in strength (Table 1 B)
2. Intermediate Strength - A193 B5 or above in strength (Table 1B)
3. Low Strength - <30 KSI yield strength (Table 1B)
   Used only in Class 150/300 joints, -20°F to 400°F.

Question 9

some carbon steels, may undergo a decrease in ductility when used

Answer 9

at low temperatures to such an extent as to be unable to safely resist shock loading, sudden changes of stress, or high stress concentration.

Question 10

Ring joint gasket materials shall

Answer 10

conform to ASME B16.20

Question 11

joint flanged is joined by

Answer 11

assembler

Question 12

fitting leak testing duration? (3)

Answer 12

1. &laquo_space;2” = 1min
2. 2.5 &laquo_space;NPS &laquo_space;8” = 2 mins
3. NPS&raquo_space; 10” = 3mins”

Question 13

what makes up a flanged joint? (interrelated)

Answer 13

1. flange
2. bolting
3. gaskets

Question 14

scope of B16.5

Answer 14

for flanges and flanged fittings

Question 15

class 150/300 have what ____ raised flange

Answer 15

0.06”

Question 16

class 400 and above have what ____ raised flange

Answer 16

0.25”

Question 17

no under tolerance allowed for

Answer 17

flange thickness

Question 18

hydro for flanges/flanged fittins

Answer 18

1. flanges = not required

2. flange fittings = not less than 1.5x100F routed to next highest 25 PSI

Question 19

flat face bolting?

Answer 19

low/intermediate or high

Question 20

what to use to judge flange face finishes?

Answer 20

visual comparison

Question 21

flange pressure test must be at what temperature use for the P in H=1.5P and round to what?

Answer 21

100F —> round to next highest 25

Question 22

pipe hydro equation )

Answer 22

= 1.5 x P X (St/Sd

Question 23

flange pressure test equation?

Answer 23

=1.5 x P = P = 100F and round next highest to 25

Question 24

high strength bolts

Answer 24

used in any flanged joints

Question 25

intermediate strength botls

Answer 25

user verifies their ability to seat the selected gasket

Question 26

low strength bolt

Answer 26

limited to 150/300# flanges

limited to 400 and -20F

Question 27

IA gasket recommend when

Answer 27

low strength bolting is used

Question 28

class 150# should use what type of gaskets?

Answer 28

IA/ IB