Injection Tube Service; Obtaining The Proper Cleaning Solution; Cleaning - pick heaters 6X7 Service Manual

PICK VARIABLE FLOW SERVICE MANUAL

INJECTION TUBE SERVICE

INJECTION TUBE ORIFICES
PLUGGED
The most common cause of this problem is
hard water. When hard water is heated
above 120°F the lime in the water
precipitates out of the water and coats the
injection tube and other surfaces These
deposits can be removed by circulating an
appropriate cleaning agent through the
heater and pump loop.
WHEN TO CLEAN THE PICK
HEATER
How often a Pick heater will require
cleaning depend son the composition of the
water being used, the length of time the
heater is in operation, the quantity of water
heated, and the temperature to which the
water is heated. Because these factors vary
from one application to another, no fixed
rules or schedules are possible. (Pick heaters
may require cleaning once per year, once
each month- or even more frequently).
Periodic inspection is the only sure way to
determine the proper interval between

cleaning.

IMPORTANT- A significant drop in hot
water temperature (below the level the
heater has been producing regularly)
indicates that the Pick heater has internal
lime deposits, and should be cleaned.
OBTAINING THE PROPER
CLEANING SOLUTION
The cleaning solution should be formulated
such that it will not attack copper bearing
alloys, (e.g. brass and bronze), cast iron,
steel or stainless steel. (316SS). Some
descaling agents can cause hydrogen
embrittlement, which may result in injection
tube spring failure, or cracking of the
injection tube. Inhibited dilute muriatic acid
is widely used with satisfactory results.
WARNING: The use of improper
cleaning solvents may result in reduced
product life or even in catastrophic
failure. If the heater is used in potable
water service all cleaning chemicals
should be FDA approved.
TABLE 1- Cleaning Solution Capacity
Heater Model
6X7
6X10
6X25
6X50
6X75
6X100
6X150
6X200
6X350
6X500
Capacity of larger heaters depends on the
size of the associated piping
INTERNAL CLEANING WIHTOUT
DISASSEMBLY
For best results, the cleaning operation
should be undertaken when the internal
lime deposits are wet. If the internal
deposits are allowed to dry before starting
the cleaning procedure, cleaning will be
much more difficult.
WARNING: The resulting
chemical reaction will produce
foaming and gasses,
particularly if it is poured rapidly.
Provide adequate ventilation.
WARNING: Be sure to follow the
manufacturer's instructions
when handling the descaling
agent. As a minimum, wear
safety goggles ad rubber gloves. A
breathing filter may also be required.
1. Obtain a supply of cleaning solvent
from your local chemical supplier.
SEE TABLE 1 for the approximate
quantity of solvent needed. Follow
Gallons (approx)
1
1
2
4
6
11
16-31
24-53
31-58
55-97
11