HVAC Procedure and Performance Guide
Determine Size and Routing of Oil and Gas Piping.
STANDARD OF PERFORMANCE
Piping must conform to all specifications and code requirements and must deliver the required flow of fuel to furnace at required pressure.
- Consult manufacturer’s specifications, job specifications and codes.
- Determine size and routing of gas piping.
- Determine type of gas and specific gravity.
- Determine furnace BTU/hr. rating.
- Determine gas flow in cubic feet per hour based on furnace BTU/hr. gas heating rate.
- Lay out gas pipe routing from gas meter to furnace, keeping as straight and simple as possible.
- Include necessary shut-off valves and drip leg.
- Calculate equivalent length of pipe run.
- Calculate line size for type of gas used. (Note: System should be designed for maximum pressure drop of 0.35 inc. WC).
- Determine size and routing of oil piping.
- Determine elevation for oil tank relative to burner. (Note: Position of oil tank must be limited to oil-pump lift capability).
- Determine if supply-system-only or supply-and-return-system is used.
- Determine type of oil.
- Determine oil-flow requirement from manufacturer’s specifications, or calculate from furnace BTU/hr. rating and oil heating value.
- Size supply and return lines based upon accepted procedures for flow required. (Note: If oil tank is higher than burner, include oil-line solenoid valve).
- Lay out routing from furnace to oil tank, keeping as straight and simple as possible.
- Include shut-off valve and filter according to codes and manufacturer’s specifications.
- Document calculations and information, and prepare sketch with appropriate notations.