576 - P1 (10Q)

Question 1

PVRV is used when operating pressure are very near to _______ condition

Answer 1

atmospheric

Question 2

PVRV setting can be changed by ___________ in the seating area of the valve.

Answer 2

adding or removing weight

Question 3

PVRV usually vented to _________.

Answer 3

atmosphere.

Question 4

Normal venting requirement includes _________ effect.

Answer 4

thermal and pump

Question 5

Emergency PVRV typically set _____ than normal venting devices and will not reclose after opening.

Answer 5

higher

Question 6

PVRV are in almost _________ service.

Answer 6

continuous

Question 7

They are prone to failure by _______ and can be detected by _________ maintenance.

Answer 7

sticking, periodic

Question 8

PVRV discs are normally called _________ may stick due to icing and are usually weight loaded. Top of the valve should be removed and checked for _______ .

Answer 8

pallet, pallet freedom of movement.

Question 9

The _________ and _______ shall be inspected for any obstruction.

Answer 9

discharge opening, inlet nozzle

Question 10

Seats shall be checked for sticking or leakages since the forces actuating the valve are _______

Answer 10

small.