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Flashcards in Measurement And Calculation of Pressure Drop Deck (16)
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1

what is the code maximum pressure drop for low pressure gas lines
in inches of w.c

1

2

what is the code maximum pressure drop for low pressure gas lines
oz/in2

.578

3

what is the maximum allowable pressure drop on a low pressure natural gas or propane in stallion?

one inch water coloum

4

how would an undersized gas line be identified

if the pressure drop exceeds one inch water coloum

5

list 7 factors that affect pressure drop

fitting and valves
length of pipe
type of pipe
initial gas pressure
type of gas
volume of gas flowing
reaming

6

pressure drop is also referred to as _____ and _____

pressure loss and pressure differential

7

you have identified an undersized gas line. what actions would you take you take to correct this problem and why?

increase the gas line size. it is the only way to ensure enough gas to the appliance.

8

what 2 test are done to determine pressure drop

the standing pressure
the operating pressure and calculate the difference

9

how would pressure drop be affected by the following measures

increase line pressure

an increase in the initial gas pressure will cause an increase in pressure drop

10

how would pressure drop be affected by the following measures

increase gas flow

an increase in gas flow will result in an increase of Pressure Drop

11

how would pressure drop be affected by the following measures

increase line length

as the line length increases the friction increases causing in increase and pressure drop

12

increasing the number of fittings

as the number of fittings increase the friction increases causing in increase in pressure drop

13

how would pressure drop be affected by the following measures
decreasing line size

decreasing line size will increase the friction increases causing in increase in pressure drop

14

how would pressure drop be affected by the following measures

using un reamed pipe

burrs left in the inside of the pipe will cause an increase in friction which will result in an increase in pressure drop

15

A regulator and normally would have an inlet pressure of ______ and an outlet pressure of ________.

12-80
7 to 14 in w.c.

16

A ___________ is used to measure gas pressures less than 1/2 psi

u tube manometer