5.3103.10 Convert Two-Pipe Steam to Hot Water

Topic: 
Hydronic Heating (Hot Water and Steam)
Subtopic: 
Piping (Distribution Installation)
Desired Outcome: 
Improved efficiency of heating system
TitleSpecification(s)Objective(s)
5.3103.10a
Check for presence of asbestos-containing materials (ACMs)

Potential ACMs will be handled in accordance with SWS 2.0110.2 Potential Asbestos-Containing Materials

Ensure a safe work environment

5.3103.10b
Assessment

System schematics, manufacturer specifications, and physical locations for all new components will be reviewed to identify proper and serviceable locations

Existing distribution piping system and retained components will be hydrostatically (or pressure) tested after traps on distribution piping and air vent opening on radiators have been capped and/or plugged

If new boiler will be used for domestic hot water ( DHW DHW Domestic hot water ) generation, boiler manufacturer specifications will be reviewed for need of buffer tank; if required, buffer tank will be sized and installed in accordance with SWS 5.3188.2 Adding Mass to Low Mass Boiler - Existing or New

Ensure system is capable of conversion

5.3103.10c
Installation of devices and piping components

Sections of piping and fittings that failed hydrostatic test will be replaced with properly sized pipe and piping material. Ensure the replacement piping meets the necessary strength requirements

Dielectric joints will be used to connect two dissimilar materials

Pipes will be properly secured (hanged or supported from below)

Pumps and/or zone valves, air separator, expansion tank, strainers, riser balance valves, and associated valves and fittings will be installed in accordance with applicable standard work specifications ,

Thermometers, pressure gauges, and isolation valves will be installed in accordance with applicable standard work specifications: SWS 5. 3102.31 Installation of Thermometers (Includes Hot Water), SWS 5.3102.21 Steam Boiler Pressure Operating Controls (Steam), SWS 5.3103.6 Two Pipe Steam Systems - Steam Traps, SWS 5.3103.7 Instatllion of Pressure Gauges

If applicable, DHW DHW Domestic hot water heater will be installed in accordance with specifications based on applicable water type

Safely and properly install piping, control components, and DHW DHW Domestic hot water heater, if applicable

5.3103.10d
Installation of controls

Outdoor reset controls will be installed in accordance with applicable standard work specifications: SWS 5.3102.5 Installation of Outdoor Reset Boiler Controller (Hot Water), SWS 5.3103.6 Two Pipe Steam Systems - Steam Traps

Pumps/zone valves (and domestic hot water heater sensors/aquastats, if applicable) will be connected to boiler/boiler sequencing controls in accordance with applicable standard work specifications

If applicable, DHW DHW Domestic hot water prioritization will be verified

Ensure generation of heat and, if applicable, domestic hot water with domestic hot water prioritization

5.3103.10e
Hydrostatic testing and flushing

System will be hydrostatically tested to withstand operating system pressure; system components will be repaired/replaced as necessary

System will be drained and flushed

Ensure the system is free of leaks, debris, and foreign objects

5.3103.10f
Insulate modified system components

All devices requiring service will be insulated with removable and reusable insulation to IECC IECC International Energy Conservation Code and ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 90.1, at a minimum

All piping and fittings will be insulated with fixed insulation to IECC IECC International Energy Conservation Code 2012 and ASHRAE ASHRAE American Society of Heating, Refrigerating and Air-Conditioning Engineers, www.ashrae.org 90.1-2010, at a minimum

Reduce energy loss

Maintain safe surface temperature

5.3103.10g
System testing and verification

Hot water production, distribution system, and delivery temperature will be tested for proper and safe operation

If applicable, DHW DHW Domestic hot water generation will be tested with domestic water prioritization

Ensure system is operating safely and efficiently

5.3103.10h
Optimization

System will be optimized in accordance with SWS 5.3104.4 Hot Water Operating Controls - Aquastat (Hot Water)

Optimize system efficiency

5.3103.10i
Education

Completed work will be reviewed with the building/property management team and operations staff

Building/property management team and operations staff will be educated on the safe and efficient operation and maintenance requirements of the installed item

Ensure building/property management team and operations staff is informed of the safe, efficient operation and maintenance requirements of the installed item