Many Ridgewood pre-war row houses retain original black iron gas risers from the 1910s-1920s, and while iron pipe itself can last for decades, the concern is whether those original lines are adequately sized for today's appliance loads. A gas riser sized in 1920 for a single range and water heater may be undersized if a high-efficiency boiler, dryer, or additional range has been added to the same line. We assess flow capacity and pressure drop across the original Ridgewood piping configuration, and in buildings where a new boiler was installed without upgrading the gas supply line, we frequently find the BTU delivery at the boiler is insufficient during simultaneous appliance use. Visual inspection and pressure testing are the starting point — we can identify which segments of the original system are compromised or undersized without replacing the entire riser unnecessarily.
Local Law 152 requires periodic inspections of all exposed gas piping in buildings with three or more dwelling units in New York City, and it applies to Ridgewood buildings regardless of their LPC historic district status. The pre-war row houses and two-families in Ridgewood's historic district that contain three or more units are subject to the four-year inspection cycle, which requires a licensed master plumber to visually inspect all exposed gas piping and file a report with the city. The original 1910s-1920s iron gas risers in these buildings are exactly what the law was designed to address — aged piping in high-density residential construction. We perform LL152 inspections throughout the Ridgewood historic district and are familiar with the original gas distribution layouts in these row-house buildings, which helps us identify deficiencies efficiently.
This is a common situation in Ridgewood pre-war row houses where a new boiler was installed but the original 1910s-1920s gas supply line feeding it was left in place. The original gas piping may have been adequately sized for an older cast-iron boiler but is often undersized for a modern high-efficiency unit with different gas valve and manifold requirements. Under-gassed boilers exhibit ignition lockouts, incomplete combustion, and in some cases flame failure codes that are misdiagnosed as boiler control problems. We see this regularly in Ridgewood because the row-house gas risers were installed 100 years ago for appliance loads that bear no resemblance to a modern condensing boiler. We can size and install a properly rated gas supply from the meter to the boiler location and test operating pressure at full load.
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