Bryan Boilers Forced Draft Steam Boilers - Manual (Page 4)

1.4 BOILER CONNECTIONS
1.4.1 GENERAL
Do not run any pipes along the access panel
side of the boiler. Maintain clearances as
shown on the dimensional drawing for
servicing of the boiler tubes. Provide at least
36" from the gas train and burner, unless a
larger dimension is indicated on the
dimensional. All piping should be designed
and installed to avoid any loadings on the
boiler connections or piping.
1.4.2 STEAM SUPPLY CONNECTION
A steam shut-off valve must be installed
between each boiler and the steam main.
This valve must be of the outside screw and
yoke design to allow indication from a
distance whether the valve is open or closed.
1.4.3 FEEDWATER CONNECTION
Install a check valve and a globe valve
between the feed pump and the boiler. It is
also recommended to install a globe valve
between the feed pump and the receiver
tank. This valve can then be adjusted to
bypass excess pump capacity to better
control the boiler feed rate.
1.4.4 SAFETY RELIEF VALVE(S)
A connection is provided in the top of the
boiler for the relief valve. The relief valve
discharge piping must be the same size as
the relief valve discharge opening. Avoid
over-tightening as this can distort valve seats.
All piping from relief valve must be
independently supported with no weight
carried by the valve.
1.4.4 BLOWDOWN CONNECTION
Blowdown valve(s) must be full size of the
connection on the boiler. Steam boilers 15
psig and below require at least one blowdown
valve. Higher pressure boilers require two
blowdown valves with one or both valves
being slow opening type. Each water column
and float type low water cut-off must be
equipped with a blowdown valve.