18
The union nuts of the valves must be tightened so that no leakage occurs at the spindle and
the handwheel / hand lever can still be turned.
Note!
After commissioning, slight leaks can occur in the valves, but these will reappear
after a short time due to temperature and pressure.
8.2 Commissioning of unit together with the boiler
First make sure that the drain valve (18) is closed. Then open the shut-off
valves (D1, D2, W1, W2) to the stop. The boiler can now be commissioned
with the indicator. After commissioning the indicator must be checked for
function and leakage. The specified torques and the described tightening
sequence (item 9.6) apply.
Check specifications of material, pressure and temperature!
8.3 Commissioning of the unit when the boiler is under pressure and at
temperature
During such procedure the level indicator shall be isolated completely from the
connected tank. Initially, both (upper-D2 and lower-W2) shut off valves should
be close. Next, the drain valve (D4) shall open. The individual carrying out the
commissioning should wait until temperature and pressure in the level indicator
is attained. After, the temperature and pressure in the level indicator is stabilized
commissioning can take place. After finishing the commissioning procedure, the D2 valve shall
be open slightly (approximately 5-minute position) to allow a restricted amount of steam to
pass through the level gauge and heat up the entire assembly at about the connected tank
temperature. That is to avoid thermal shok from rapide changes in material temperature. When
the gauge temperature is attained to the tank´s operating temperature the drain valve (4) shall
be completely closed. The D2 valve shall then open completely. As the shut-off valves are
quick closing type, it shall be opoen slowly in order to not allow an excessive amount of steam
entering the level indicator suddenly and create shoks that might lead to fatigue. Afre the level
indicator is fill with steam the responsible individual shall wait until pressure is stabilized and
condensation will start to form. Then W2 valve shall be slowly opened to allow water to pass.
The presure in the level indicator shall be stabilized before opening the W2 valve, otherwise
ther is a risk of flushing during opening of the W2 valve that can cause damages to the valve
as well as the level indicator. When the water level falls to the expencted NWL, both valves
shall be ensured that open and to be checked for leaking.
Info
Caution
Caution
hot!
