De Nora Capital Controls 71V3B Series, Instruction Manual

- 35 - 115.6031.0

    Be certain to orient the support flange so that the inlet and outlet connections of the vaporizing chamber are  

    located in their original position. However, do not reconnect the removable pipe sections at this point.

    If the Vaporizer is equipped with cathodic protection, it is recommended that the magnesium rods be replaced  

    at this time.

    If the electric immersion heater was removed for cleaning, inspect the gasket prior to reassembly and replace the  

    gasket if necessary.

    When replacing the heater gasket(s), torque the bolts with dry lubed threads evenly in a crisscross star pattern to  

    a torque of 30 Ft-lbs.

15)  Fill the water chamber to operating level, restore power to the control circuits and heater, and bring the  

    Vaporizer up to operating temperature.

16)  Reconnect the supply of dry compressed air or nitrogen to the Vaporizer inlet connection and turn on the air  

    to purge the vaporizing chamber of all moisture. Then turn off and disconnect the air supply. Reconnect the pipe  

    sections, being certain to install new gaskets in each of the joints.

TABLE 4-1 TROUBLESHOOTING CHART

PROBLEM

PROBABLE CAUSE

CORRECTIVE ACTION

Minimum recommended water 

temperature (i.e., 15°F below 

setting on water temperature 

controller) cannot be achieved 

and/or maintained as 

evidenced by: a) gas flow being 

shut off by closure of pressure 

reducing and shut-off valve, b) 

water low temperature alarm 

being energized.

1. Electric immersion heater defective.

2. Magnetic heater contactor defective.

3. Surfaces of heater elements of 

    electric  immersion heater fouled.

1. Check continuity of heater elements.

2. Check operation of holding coil and 

    contacts.

3. Shut down the Vaporizer, as described  

    under Section 3.10, remove the heater  

    and clean the elements.  

    Upon reassembly inspect and replace  

    the heater gasket, if necessary.

Maximum recommended 

water temperature (i.e., 

15°F above setting on water 

temperature controller) is 

exceeded as evidenced by: 

a) water observed to have 

reached its boiling point,  

b) water high temperature 

alarm being energized.

1. Magnetic heater contactor  

    contacts  fused.

1. Replace contacts.

Water level below normal 

as evidenced by: a) visual 

observation of sight glass of 

water level gauge, b) low water 

level alarm being energized.

1. Y-strainer in water supply line to  

    water supply piping assembly dirty.

2. Improperly set water level control 

    switch or faulty solenoid valve.

1. Clean Y-strainer

2. Reset switch or replace valve, as 

    required.

Gas pressure exceeds setting 

on pressure relief valve as 

evidenced by: a) gas being 

discharged from the terminus 

of the emergency and servicing 

vent line,  

b) vent alarm being energized, 

c) pressure switch tripped.

1. Vaporizer isolated by valve closure.

2. Faulty pressure regulator in air 

    supply line to air padding system.

3. Rupture disk leaking.

1. Open valve after ascertaining the 

    ability of the system to receive  

    pressurized gas.

2. Replace regulator.

3. Replace rupture disk.