10
Boilers operating 16 psi to 100 psi inclusive require a y-
type gate or a ball valve rated for 125 WSP.
Boilers operating 101 psi to 150 psi require piping
designed for a pressure of 125% of the boiler safety
valve set pressure (schedule 80 blowdown piping), one
quick opening, and one slow opening blowdown valve. If
cast iron, these valves must be class 250, or if steel,
these valves must be class 150, or if bronze, a WSP
rating of at least 200.
Standard globe valves that form a pocket inside the valve
are not acceptable blowdown valves. Y-type, gate, and
ball valves are acceptable blowdown valves.
Galvanized piping is
not acceptable
for boiler blowdown
piping.
2.
Automatic Bottom Blowdown
A Lattner automatic bottom blowdown valve may be used
in place of one of the manual blowdown valves.
3.
Control/Water Column Blowdown
A water column level control is supplied with drain valve.
Connect the control line to the bottom blowdown line
after
the second bottom blowdown valve.
4. Blowdown
Discharge
All boiler blowdown water must be discharged to a safe
location, specifically to a blowdown separator.
5. Blowdown
Separator
Select a Lattner blowdown separator according to the
size of the boiler blowdown connection.
Blowdown
Connection
Separator
Model
1” 810
1-1/2”
1450 or 1455
2” 1600
2-1/2” 1800
6. Inspection
Opening
The extra coupling in the separator vessel is an
inspection opening. The inspection opening will be
plugged.
7. Vent
The blowdown separator must be vented to atmosphere.
Vent pipe must discharge through the roof outside.
DO NOT
reduce the vent pipe size.
NEVER
connect the
vent pipe from the condensate tank to the separator vent.
8. Separator
Drain
The water leaving the separator through the drain should
be piped to the sewer. Some codes require the water to
pass through an air gap before entering the sewer.
9. Aftercooler
If the water must be cooled before entering the sewer
(required by some codes), then an aftercooler must be
used. The aftercooler attaches to the separator drain
connection and mixes cold water with the hot drain
water. Units may be either manual or automatic. Select
the aftercooler according to separator drain size.
Separator
Manual
Automatic
810 205M 205A
1450,1455 301M
301A
1600 525M 525A
1800 625M 625A
10. Cooling
Water
Supply
Connect cold water supply pipe to aftercooler.
11. Dead Boiler Drain Valve
For draining the boiler when it is cool and not under
pressure, the entire drain line must be lower than the
bottom of the boiler. Pipe to sewer or floor drain. Valve
must be rated up to the maximum allowable working
pressure of the boiler.
12. Codes & Standards
All blowdown piping, drain and sewer connections,
water piping and separator connections must be done in
strict compliance with all applicable codes.
I. Safety
Valve
1. Installation
Be sure safety valve is threaded securely into the boiler
or into the elbow supplied with boiler. The safety valve
will always be installed in the upright position
2. Discharge
Pipe the safety valve outlet to a safe point of discharge.
DO NOT
reduce the safety valve discharge piping.
NEVER
plug the safety valve outlet.
3. Supports
Safety valve piping should be secured by clamps or
braces to a wall or structural member. Do not allow the
discharge piping to hang on the safety valve.
4. Codes & Standards
All safety valve piping and supports must conform to all
applicable codes.
J. Gas Train Piping
1. Components
In general, a gas train should include a manual gas
cock, a main gas pressure regulator, a main gas valve,
a safety shut-off gas valve, a pilot gas pressure
regulator, a pilot gas valve, and a flame failure control.
Summary of Contents for Lattner
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