Form 43539178
Oct 2019
12
To perform the lock-up and leakage test, follow these steps:
1. With the LP tank valve fully open, shut off all appliance valves so there is no demand for gas.
This includes shutting off all pilots.
2. A slight rise in pressure will occur under these conditions. This rise should be no more than
120% of the delivery pressure. This is the lock up pressure.
NOTE:
A quick rise in pressure
above the allowable lock-up point could indicate undersized piping, a worn seat disc or
foreign material in the seating area. This condition must be corrected before putting the
system in service.
3. Continue the test for five minutes or more. If a creeping rise in pressure is noticed, the final
stage regulator seat is not closing off properly. The regulator must be replaced or repaired,
and the system retested, before putting the system in service.
7b.
GAS PIPE SIZING EXAMPLE
House Size: 12.2m x 122m
Brooder Quantity: 14
Individual Brooder Capacity: 12kW
Second Stage Regulator Pressure: 37mbar
Operating Pressure: 25mbar, LP gas with all brooders operating
STEP 1. Gas should be run at high pressure from the LP tank to the second stage regulator at
the house. Using the above house configuration example, calculate the gas pipe sizing. First,
calculate the total distance from the second stage regulator to the furthest brooder. In Figure 9
above, that distance equals 62m (6m + 56m). Using Table 1, look up the row for 61.5m and
select the smallest pipe size that has the capacity for the flow of the end brooder (12kW). The
smallest pipe size is ½” with a capacity of up to 17kW over 61.5m.
STEP 2. Calculate the distance from the second furthest brooder to the secondary regulator. In
the example, that distance equals 53.5m. Using Table 1, look up the row for 53.5m. As 53.5m
is not listed, you will use the next distance up, in this case 61.5m. Then select the smallest pipe
size that has the capacity for the flow of both the furthest (#7) and second furthest (#6) brooders,
which combines to 23.4kW. The smallest pipe size is ¾” with a capacity of up to 35.2kW over
61.5m. Repeat this process for each brooder until you reach the Tee. Table 2 shows the
completed example.
STEP 3. At the Tee, calculate the total distance to the secondary regulator. In this example, that
equals 6m. Using Table 1, look up the row for 6m and select the smallest pipe size that has the
capacity for the flow of all the brooders connected to the pipe system (164kW). The smallest
pipe size is 1” with a capacity of up to 231kW over 6m.
Figure 7