Water Piping; Section 3 Contents; Section 3 Figures And Tables - Burnham 8HE Series Application Instructions

3

Water Piping

• Pressure relief valve discharge piping must be piped such that the potential of severe burns is eliminated. DO
NOT pipe in any area where freezing could occur. DO NOT install any shut off valves, plugs or caps. See boiler
manual for further information.
• Continued boiler operation for prolonged periods of time under conditions when temperature differential across
the system exceeds 40°F and/or return water temperature stays below 135°F may result in pre-mature boiler and
vent system failure due to flue gas condensation and/or thermal shock.

Section 3 Contents:

3.1 Avoiding Condensation.
3.2 General Layout Considerations.
3.3 Component Sizing – General.
3.4 Water Quality Requirements.
3.5 Primary-Secondary Piping.
3.6 Parallel Piping.
3.7 Modular vs. Multiple Boiler Installations.
3.8 Limit Controls.
3.9 Low Water Cut-offs.
3.10 Relief Valve.
3.11 Pressure & Temperature Gauge.
3.12 Fill Valve.
3.13 System Circulator.
3.14 Strainers.
3.15 Temperature Drop.
3.16 Main Piping.
3.17 Expansion Tank.
3.18 Water Manifolds.
3.19 Installation of Optional Flex Couplings.
3.20 Installation of V-Groove Couplings.
3.21 Domestic Water Heating.
3.22 Oxygen Corrosion
3.1 Avoiding Condensation – Large volume
systems during the "shoulder" heating seasons
or systems with aggressive set back or low
temperature systems will cause extended
condensation periods that will shorten boiler life.
Maintain return water temperature at minimum
of 135°F temperature and differential (drop)
across the system at 40°F or less. Methods to
avoid condensation include by-pass piping,
recirculation loops, and mixing valves discussed
in paragraphs and Figures below.
3.2 General Layout Considerations - Venting is
generally less flexible in design location than
are water pipes. To avoid conflicts for a given
22
8HE
!
WARNING

Section 3 Figures and Tables:

Fig. 3-1 Piping Diagram, Prim/Sec, with Mixing Valves
Fig. 3-2 Piping Diagram, Prim/Sec, with Bypass
Fig. 3-3 Piping Diagram, Parallel Piping
Fig. 3-4 Expansion and Air Elimination Details
Fig. 3-5 Piping Diagram, Prim/Sec with Manifolds
Table 3-6 Boiler Water Data
Fig. 3-7 Friction vs. Water Flow – Iron Pipe
Fig. 3-8 Friction vs. Water Flow – Copper Pipe
Table 3-9 Pipe Elbows, Equivalent Feet
Table 3-10 Volume of Water in Pipe
Table 3-11 Expansion Tank Capacity
Table 3-12 Expansion Tank Correction Factor
Fig. 3-13 Piping Diagram, Domestic Water
Table 3-14 Service Hot Water Demand, Fixture Units
Fig. 3-15 Service Hot Water Flow Rate
Fig. 3-16 Sizing Factors for Combination Heating &
DHW
location, design and layout the venting before
proceeding with water piping in this section.
Consider proximity of piping to items that need
access for service. Do not block passageways
with piping. Do not block access panels on the
boiler jackets.
3.3 Component Sizing – General. The purpose of
Section 3.0 is to recommend piping systems and
accessories that can be used with Series 8HE
Gas Boilers. Although recommended design
procedures are presented, the final sizing of
mains, pumps and expansion tank must be left
to the designer of the total system because only
that designer has available the requirements and
capacities of the connected system.
Multiple Boiler Application Instructions
111924-01 - 2/23