HTW 80 | Hot Water Pump | Tempuflo Series

The HTW 80 is an advanced high‑temperature end‑suction centrifugal pump engineered to maintain stable hydraulic performance in extreme thermal environments. As part of the Tempuflo HTW Series, it incorporates a patented seal protection system designed specifically for processes involving hot water, ethylene glycol, propylene glycol, and triethylene glycol. Its construction and thermal management architecture address the two primary challenges inherent to heat‑transfer pumping: seal degradation and thermal stress on rotating assemblies. 

At the heart of the pump’s thermal‑resistance capability is its isolated seal chamber, a proprietary technology developed to physically separate the mechanical seal from the high‑temperature process fluid. This isolation prevents direct exposure of elastomers and seal faces to temperatures that would typically exceed their operational thresholds. The chamber is then actively temperature‑controlled using a dual‑cooling system composed of:

1. Cooling loop / heat exchanger, which circulates coolant around the seal cavity to dissipate heat, and
2. A fan clamp assembly mounted to the motor shaft, generating airflow across the exterior of the seal chamber to amplify heat extraction. 

This dual‑cooling configuration ensures the mechanical seal cavity remains at a maximum temperature of 170°F (77°C) even when the pumped medium reaches 400°F (204°C) — a significant operational advantage that drastically extends seal life and reduces maintenance frequency. Traditional centrifugal pumps operating in similar thermal ranges often suffer from rapid seal wear due to the inability to manage heat transfer effectively. By minimizing thermal load on the seal, the HTW 80 maximizes operating uptime, making it particularly advantageous for continuous‑duty industrial applications. 

Hydraulically, the HTW 80 utilizes a 5.9-inch (149.8 mm) enclosed steel impeller, designed for both efficiency and durability at elevated temperatures. The enclosed impeller configuration improves hydraulic performance by reducing internal recirculation and delivering better volumetric efficiency compared to open‑impeller designs. It enables the pump to achieve flow rates of up to 80 GPM (18.16 m³/h) with heads reaching 127 ft (38.7 m), making it suitable for closed‑loop heat‑transfer systems, process heating circuits, and thermal control modules in industrial environments. 

Structurally, the pump is built from ductile iron, selected for its mechanical stability under high thermal cycling. Ductile iron offers significantly higher tensile strength and impact resistance than standard cast iron, while providing the dimensional stability required for temperature fluctuations up to 650°F (343°C). This material choice ensures long‑term reliability in heavy‑duty industrial installations. 

The HTW 80 supports both NPT threaded and 150# flat‑flange connection options for suction and discharge, allowing compatibility with varied piping systems. Additionally, the discharge port can be configured in either horizontal or vertical orientation, enabling flexibility during installation and making it easier to integrate into compact or pre‑engineered systems without redesigning piping layouts. 

The pump is available in close‑coupled configurations compatible with 56C and 145TC NEMA C‑Face motors, simplifying alignment, reducing footprint, and lowering installation time. Close coupling eliminates the need for separate couplings and alignment procedures typically required in frame‑mounted pump designs. Combined with a carbon / silicon carbide / Viton mechanical seal, the HTW 80 is equipped to handle both the mechanical and chemical demands of high‑temperature, glycol‑based thermal fluids. 

Together, these advanced design features make the HTW 80 an exceptionally robust pump for high‑temperature process applications where reliability, seal longevity, and thermal stability are critical to overall system performance.