Xylem Heat Exchangers User Manual download pdf (Page 2)

ITT Heat Transfer heat exchangers are protect-

ed against the elements during shipment. If

they cannot be installed and put into operation

immediately upon receipt at the jobsite,

certain precautions are necessary to prevent

deterioration during storage. Responsibility

for integrity of the heat exchangers must be

assumed by the user. ITT Heat Transfer will

not be responsible for damage, corrosion or

other deterioration of heat exchanger equipment

during transit and storage.

Good storage practices are important, considering

the high costs of repair or replacement, and the

possible delays for items which require long lead

times for manufacture. The following suggested

practices are provided solely as a convenience

to the user, who shall make his own decision on

whether to use all or any of them.

On receipt of the heat exchanger, in spect

for shipping damage to all protective

covers. If damage is evident, inspect for

possible contamination and replace pro-

tective covers as required. If damage is

extensive, notify the carrier immediately.

If the heat exchanger is not to be placed

in immediate service, take precautions

to prevent rusting or contamination.

Heat exchangers for oil service, made

of ferrous materials, may be

pressure-tested with oil at the fac-

tory. However, the residual oil coating

on the inside surfaces of the exchanger

does not preclude the possibility of rust

formation. Upon receipt, fill these

exchangers with appropriate oil or coat

them with a corrosion prevention com-

pound for storage. These heat exchangers

have a large warning decal, indicating

that they should be protected with oil.

The choice of preservation of interior

surfaces during storage for other service

applications depends upon your system

requirements and economics. Only when

included in the original purchase order

specifications will specific preservation

be incorporated prior to shipment from

the factory.

Remove any accumulations of dirt,

water, ice or snow and wipe dry before

moving exchangers into indoor storage.

If unit was not filled with oil or other

preservative, open drain plugs to remove

any accumulated moisture, then reseal.

Accumulation of moisture usually

indicates rusting has already started and

remedial action should be taken.

Store under cover in a heated area, if

possible. The ideal storage environment

for heat exchangers and accessories

is indoors, above grade, in a dry,

low-humidity atmosphere which is

sealed to prevent entry of blowing

dust, rain or snow. Maintain tempera-

tures between 70°F and 105°F (wide

temperature swings may cause conden-

sation and “sweating” of steel parts).

Cover windows to prevent temperature

variations caused by sunlight. Provide

thermometers and humidity indicators at

several points, and maintain atmosphere

at 40% relative humidity or lower.

In tropical climates, it may be necessary

to use trays of renewable dessicant (such

as silica gel), or portable dehumidifiers,

to remove moisture from the air in the

storage enclosure. Thermostatically

controlled portable heaters (vented to out-

doors) may be required to maintain even

air temperatures inside the enclosure.

Inspect heat exchangers and acces-

sories frequently while they are in

storage. Start a log to record results

of inspections and maintenance

performed while units are in storage.

A typical log entry should include, for

each component, at least the following:

a. Date

b. Inspector’s name

c. Identification of unit or item

d. Location

e. Condition of paint or coating

f. Condition of interior

g. Is free moisture present?

h. Has dirt accumulated?

i. Corrective steps taken

Storage

This bulletin has been prepared as an aid

and guide to maintenance personnel. Read it

thoroughly prior to installation of any ITT Heat

Transfer heat exchanger in order to ensure

correct installation and best performance.

NOTE: Before placing this equipment

in operation, environment and service

conditions should be checked for

compat ibility with materials of

construction. Contact your nearest ITT

Heat Transfer representative if you are

not sure what the actual materials of

construction are.

Successful performance of heat transfer

equipment, length of service and freedom

from operating difficulties are largely

dependent upon:

1. Proper thermal design.

2. Proper physical design.

3. Storage practice prior to installation.

4. Manner of installation, including design

of foundation and piping.

5. The method of operation.

6. The thoroughness and frequency

of cleaning.

7. The materials, workmanship, and tools

used in maintenance and making repairs

and replacements.

Failure to perform properly may be due

to one or more of the following:

1. Exchanger being dirty.

2. Failure to remove preservation

materials after storage.

3. Operating conditions being different

than design conditions.

4. Air or gas binding.

5. Incorrect piping connections.

6. Excessive clearances between

internal parts due to corrosion.

7. Improper application.

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