Algas SDI Direct Fired 120/60H, Operation & Maintenance Manual

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Maintenance
4-24
Algas-SDI Operation and Maintenance Manual
– P/N - 52642
13.
Lightly grease and replace the O-ring around the inlet valve cap (large flange nut).
14. Install inlet valve cap (large flange nut) and tighten into valve body. You may apply NEVER-SEEZ
compound to the flange nut to allow for easy removal of the flange nut in the future.
15.
Once the internal components of t
he valve are replaced perform a “water test” to ensure your inlet valve
is sealing properly. To perform this test: apply a 1/8” plug in the top of the inlet valve cap using Teflon
tape to ensure it is leak-proof. Using an air hose, apply 80-100 psig (6-7 bar) of air pressure at the inlet of
the valve and completely submerge the valve in a bucket or sink full of water. Wait approximately 5-10
seconds and observe for air bubbles exiting the valve around valve stem that protrudes from the middle of
the inlet valve. If no bubbles are present, the valve is sealing properly.
16.
Remove any remnants of the old inlet valve flange gasket from the surface of the flange on the inlet valve
itself and on the flange at the heat exchanger. Inspect surfaces for marks or other damage and clean of
any other debris.
17.
Inspect new inlet valve flange gasket for damage
– primarily any tears, bends, or significant scratches.
18. Lightly spray flange gasket with a dry lubricant (graphite) before installing it on the unit.
19.
When re-installing the inlet valve on the vaporizer, place flange gasket on the gasket surface and slide
the stem under the float ball inside the heat exchanger. Slightly tighten the bottom two flange bolts
allowing the flange gasket to be supported by the two bottom bolts. Working your way around the valve,
hand tighten the remainder of the bolts inspecting as you tighten them to ensure the position of the inlet
valve flange gasket is correct.
20.
To tighten the inlet valve bolts, torque the 6 bolts to 30-35 ft.-lbs (40.7-47.5 Nm) in a cross/star pattern.
21.
Leak test inlet valve flange bolts prior to re-starting the vaporizer.