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24 Cards in this Set
- Front
- Back
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What is max pres drop for low pressure gas line in inches of WC |
1max pre |
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Max pres drop for low pressure gas line in oz/in2 |
0.578 |
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What is the max pres drop for low pres nat gas or propane |
One inch water column |
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How would an undersized gas line be identified |
If it drops more than 1 inch WC |
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6 factors that effect pres drop |
1. Fittings + valves 2. Length of pipe 3. Type of pipe 4. Initial gas pres 5. Type of gas (specific gravity) 6. Vol of gasses flowing |
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Pressure drop is also referred to as |
Pressure loss and pres differential |
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How to fix undersized gas line |
Increase gas line size |
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What 2 tests are done to det pres drop |
Standing and operating pres then calculate diff bet 2 |
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How would pres drop be effected by increasing line pres |
Would cause increase in pres drop |
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How would pres drop be effected by increasing gas flow |
Increase in pres drop |
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How would increased line length effect pres drop |
Increased friction causes increased pres drop |
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How would increasing number of fittings effect pres drop |
Increased friction causes increased pres drop |
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How would decreasing line size effect pres drop |
Increased friction causes increased pres drop |
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How would in reamed pipe effect pres drop |
Increase friction and increase pres drop |
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Define U-tube manometer |
Device used to measure gas pres. Has liq tube that displaces linear amount of liq |
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Gauge manometer |
Use to measure low gas pres. Calibrated in inches of WC |
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Line pres test |
Taken downstream of service regulator but upstream of app regulator when no gas is flowing |
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What does it mean when you get substantially high readings on line pres test |
Regulator creeping. Means something is wrong internally with regulator |
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Standing pres test |
Taken downstream of service reg. and or second stage reg and up stream of app(s) with only pilot(s) burning |
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Operating pres |
Is pres taken downstream of service reg and up stream of app reg with app main burner(s) operating |
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Define differential pres |
Diff bet standing and operating pres |
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Manifold pres. |
Pres at burner taken downstream of app reg while main burner is operating |
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Define pres |
Continuous force upon matter usually expressed in weight per unit area |
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Define flow |
Movement of fluid from high pres area to low pres area |
