1. Big capacity boilers.

Question 0

6. How shall you check for leakage when the gas turned on?

Answer 0

Use noncorrosive leak detection fluid or other approved leak detection method, around the diaphragm flanges, bottom plate, vent opening, seal cap, pipe connections, and all other joints. Wipe clean with a damp rag.

Question 1

1. Gas supply line to big capacity boilers?

Answer 1

1. Main gas supply pipe.
2. Pressure switch by Brooklyn Union Gas CO with 1/2” piping to SPOT installed vertically.
3. Lubricated shut off cock with locking device.
4. Cross Tee with 1/8” pet cock, nipple and cap, and with dirt pocket.
5. Nipple with pressure gauge.
6. Maxitrol main gas pressure regulator with vent to atmosphere.
7. Nipple with low pressure switch HW C 437E - manual reset.
8. Safety shut off valve with proof of close.
9. Nipple with line to solenoid vent valve, vent to atmosphere, and with 1/8 pet cock, nipple and cap.
10. 2nd shut off valve with proof of close.
11. Nipple with:
    A. Shut off cock.
    B. High pressure switch HW C437Q - manual reset.
    C. 1/8 pet cock, nipple and cap.
12. Shut off cock with locking device.
13. Firing Rate Control Valve HW VSE.
14. Line to burner gas manifold inlet main pressure 25”.

Question 2

7. When does gas regulator require a vent line?

Answer 2

Inlet pressure exceeding 2 psi (LP) or 5 psi (natural).

Question 3

8. Parts of gas line to pilot of a big capacity boiler?

Answer 3

1. Pipe line from firm low pressure gas meter.
2. Shut off cock.
3. T with dirt pocket .
4. Union.
5. Low pilot gas pressure switch C645A.
6. Pilot pressure regulator 11101.
7. Test gauge connection for adjusting regulator 1’-1 1/2” water column.
8. Pipe line to burner gas pilot connection € pilot solenoids.