On a double check or reduced pressure assembly, where is test cock No. 2?
- On the upstream side of the inlet shutoff valve
- Between the inlet shutoff valve and the first check
- Between the first check and the second check
- Between the second check and the outlet shutoff
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B. Between the inlet shutoff valve and the first check
Test cock 2 reads supply pressure just ahead of the first check, downstream of the No. 1 shutoff. Test cock 1 is the one on the upstream side of the inlet shutoff valve.
Reference: USC FCCCHR Manual of Cross-Connection Control, 10th ed., field test procedures
On a reduced pressure principle assembly, test cock No. 3 gives access to the:
- supply side of the first check valve
- zone between the two check valves
- downstream side of the second check valve
- upstream side of the inlet shutoff valve
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B. zone between the two check valves
Test cock 3 taps the reduced pressure zone between the checks. The downstream side of the second check is reached through test cock 4.
Reference: USC FCCCHR Manual of Cross-Connection Control, 10th ed., field test procedures
On a double check valve assembly, test cock No. 4 is located:
- between the first check and the second check valve
- between the inlet shutoff and the first check valve
- on the downstream side of the outlet shutoff valve
- between the second check and the outlet shutoff valve
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D. between the second check and the outlet shutoff valve
Test cock 4 is downstream of the second check and ahead of the No. 2 shutoff. No test cock is located beyond the outlet shutoff valve.
Reference: USC FCCCHR Manual of Cross-Connection Control, 10th ed., field test procedures