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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
piping.
2.
Automatic Bottom Slowdown
A Lattner automatic bottom blowdown valve may be used
in place of one of the manual blowdown valves.
3.
Control/Water Column Slowdown
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.
Slowdown Discharge
All boiler blowdown water must be discharged to a safe
location, specifically to a blowdown separator.
5.
Slowdown Separator
Select a Lattner blowdown separator according to the
size of the boiler blowdown connection.
1"
1-1/2"
2"
2-1/2"
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.
reduce the vent pipe size.
DO NOT
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.
for boiler blowdown
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 pllowable 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
810
2. Discharge
1450 or 1455
1600
Pipe the safety valve outlet to a safe point of discharge.
1800
DO NOT
NEVER
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.
connect the
NEVER
Gas Train Piping
J.
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.
10
810
205M
1450, 1455
301M
525M
1600
1800
625M
·
reduce the safety valve discharge piping.
plug the safety valve outlet.
205A
301A
525A
625A
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