Lochinvar & A.O. Smith 100133547 Flange Gasket

The Lochinvar & A.O. Smith 100133547 Flange Gasket is a critical high-temperature seal designed for commercial water heaters and boiler systems. Specifically engineered for Armstrong ARM1013 cross-compatibility, this gasket pair ensures a leak-proof interface between the pump flange and the circulation piping. In low and high-pressure hydronic loops, maintaining a rigid seal is essential to prevent cavitation and pressure drops. These gaskets are fabricated from heavy-duty, heat-resistant elastomer materials capable of withstanding the thermal cycling common in Lochinvar Knight and Armor water heater applications. Whether performing a routine pump replacement or a system overhaul, using OEM-spec gaskets is the only way to ensure the boiler pump flange maintains structural integrity under load. This specific kit is frequently utilized in A.O. Smith BTP and Cyclone series units where flange gasket replacement is required to maintain peak hydraulic efficiency and prevent oxidative corrosion at the joint.

Key Benefits for Technicians:

• Direct OEM Cross-Reference: Exact replacement for ARM1013 and 100133547, ensuring precise bolt-hole alignment and hardware fitment.
• High-Temperature Resistance: Formulated to maintain elasticity and sealing pressure in commercial boiler parts environments exceeding standard residential temperatures.
• Professional Grade Sealing: High-density material composition prevents gasket "blow-out" during high-velocity circulator pump operation.
• Complete Pair: Includes two gaskets to service both the inlet and outlet flanges of a standard pump housing.

Common Installation Questions:

Is the 100133547 gasket compatible with non-Lochinvar pumps?
Yes, while specified for Lochinvar and A.O. Smith systems, this gasket fits standard 2-bolt flange patterns used in various commercial hydronic circulators matching the ARM1013 specification.

Do these gaskets require additional sealant or RTV during installation?
When surfaces are properly cleaned and deburred, these gaskets are designed to seal dry. Adding silicone or pipe dope can often lead to gasket slippage or premature failure at the flange interface.

When should these gaskets be replaced?
Standard protocol dictates replacing the flange gasket every time the pump is pulled or the piping is disconnected to ensure a fresh compression seal.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.