Before installing the Drain-All, Inc.
Model 1700
TM
, a review of the following
items will help make the right decision
regarding options which could be used to
ensure long-term maintenance free oper-
ation.
RUST AND SCALE
Even though the Drain-All, Inc. Model
1700
TM
is designed for handling rust and
scale, it is recommended that the system
be blown down after all piping is
installed and before the Model 1700
TM
is
connected to the piping. The Model
1700
TM
, with a large, smooth, liquid flow
path, easily handles contaminates in the
liquid once the system is in operation. If
there is excessive rust and scale on a con-
tinuous basis, consider using the Rust
Handler
TM
designed for compressed air
systems that have extremely heavy
amounts of rust and scale.
CONTROL AIR & BALANCE LINE
The control air line provides air through
the sealed center tube to operate the air
cylinder. Clean dry air should be used for
this control air supply. The balance line
provides a means to handle the displaced
air from the reservoir as the liquid enters
the reservoir. The control air line and the
balance line are two separate lines which
have nothing in common with each other
and should never be connected to each
other in any way. Do not tie them togeth-
er with a tee fitting.
CONTROL AIR
Control air pressure requirements vary by
product and must be regulated within
specifications provided in the product’s
Installation Guide. If the specified pres-
sure for control air cannot be supplied in
your application, contact your distributor
for information on control air options
offered by Drain-All, Inc. to accommo-
date your available control air pressure.
BALANCE LINE
The balance line must have either (1)
exactly the same pressure as the vessel
being drained or (2) slightly less pressure
than the vessel being drained.
The same pressure is achieved when the
balance line is tied back into the vessel
being drained, such as connecting the
balance line at a tee fitting on the vessel’s
pressure gage or access port. A slightly
lower pressure may be achieved by locat-
ing the balance line connection on the air
header pipe a few feet downstream from
the vessel being drained. When hooking
the balance line to an air header, connect
it to the header prior to any other vessel
attached to the header.
If there is absolutely no place to connect
the balance line into the air system, or if
a temporary installation is to be made
while waiting for the next shutdown to tie
in the balance line, the balance line can
be vented to atmosphere. Install the nee-
dle valve that comes as a component of
the installation kit into the port on top of
the Model 1700
TM
where ''Balance Line''
is indicated. Then follow the start-up
instructions for adjusting the opening of
the balance line needle valve. There will
be very little air loss to atmosphere.
NO MANIFOLDS
There cannot be multiple system drains
through a manifold to one Model 1700
TM
.
This will not work because all system
drains will not be of the same pressure.
Therefore, the liquid from the higher
pressure drain lines will bypass the
Model 1700
TM
and flow backwards up the
lower pressure drains. Installing check
valves on system drains is not a solution
because pressure variations which inhibit
proper operation will still be present.
Proper installation of the balance line is
not possible with multiple drains hooked
up through a manifold.
CORROSION
There are Drain-All, Inc. products avail-
able which include corrosion resistant
coatings and materials. If the application
environment is highly corrosive, check
these products and options to determine
if they should be specified. Also available
are Drain-All, Inc. products which handle
higher pressures and temperatures.
INSTALLATION STEPS
1.
Prior to installing the Model 1700
TM
,
blow down the vessel being drained to
remove excessive rust, scale, and dirt
knocked loose during piping installation.
2.
Remove the Model 1700
TM
from the
box and set it in an upright position
where it will be connected. Most Drain-
All, Inc. products do not have to be
secured. Larger volume and higher pres-
sure products may require some form of
movement restraint. To ensure proper
operation in all installation layouts, the
top of the Model 1700
TM
should be lower
than the bottom of the vessel being
drained.
3.
Using 1/2” pipe, connect the vessel
being drained to the 1/2” liquid inlet on
the base of the Model 1700
TM
. Be sure to
install a shut-off valve and a bypass valve
between the vessel being drained and the
Model 1700
TM
. This will allow easy
removal of the Model 1700
TM
"on the
run" during any preventive maintenance
activities. After installing the piping,
close the inlet shut-off valve.
4.
Using 1/2” pipe, connect the Model
1700
TM
discharge outlet to a sealed drain
pipeline or enclosed/covered trough. The
discharged liquid is under pressure and
can splash back if directed downward
toward the bottom of a simple, shallow,
open trough-type floor drain.
5.
Connect the balance line from the
Model 1700
TM
to the appropriate connect-
ing point on the vessel being drained
using the tubing and needle valve provid-
ed in the installation kit. After installing
the balance line, close the balance line
needle valve.
6.
Using the tubing and needle valve pro-
vided in the installation kit, connect the
control air supply line to the control air
filter inlet on the Model 1700
TM
. Always
use the cleanest and driest air possible to
ensure long term maintenance free oper-
ation. After connecting the control air
line, close the control air needle valve.
INSTALLATION
Page 2
022802 Model 1700-IG
