NPT versus BSP

InNorth America, NPT (National Pipe Thread) is the standard thread used on nearly all plumbing fittings. NPT will be found on products sold in North America, whereas BSP (British Standard Pipe) is commonly used on UK and EU products. You will find BSP used in most other parts of the world.

There are two notable differences. NPT is flatter and sharper at the threads, where BSP is rounded, and the TPI will be the same on some of the smaller sizes, but will differ greatly on many sizes. The other issue that arises with either type of measurement is determining the size of the pipe. The nominal size refers to the internal diameter of the pipe, the actual functional area of the fitting or pipe where the medium (water, gas, etc.) would flow through it, as opposed to the overall size.

National Pipe Thread plumbing fittings are not interchangeable with British Standard Pipe fittings.

Most people would measure what they see, that is the outside diameter, which can cause confusion. Figure 1 compares the ID versus the OD, as well as the threads per inch (TPI) for each type of black iron pipe, which is a common way to connect to cast iron radiators. PEX and copper are good options to connect radiators as well, but they have their own ID/OD differences. Figure 1 is not an exhaustive chart, but the most common sizes used in radiator installation and service are shown.

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Noise reducer

The Hercules Sludgehammer system restorer and noise reducer provides system cleaning and reduced kittling, while restoring heating system efficiency. Suitable for all metals, the restorer pairs well with Hercules Sludgehammer Universal Corrosion Inhibitor as part of an annual maintenance program. The restorer and noise reducer helps restore system efficiency, and can be used in older boiler systems or when a new boiler is fitted into an existing system with sludge and scale build-up.

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Combustion analyzer

Ritchie Engineering introduces the Yellow Jacket combusion analyzer CA502 and CA502P. The CA502 ensures safety, efficiency, and proper operation of residential and light commercial heating appliances with three key measurement functions in one unit: ambient CO monitor, manometer, and combustion analyzer. Compact and lightweight, the analyzer comes with a magnetic protective holster. The CA502P is available with a wireless printer option. www.

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Wall-mounted boiler

Viessmann's Vitotron 100, VLN2 wall-mounted electric boiler offers a compact design, fast and simple installation, and quiet operation, making it ideal for heating in low-temperature, space-restrictive residential applications. With a rated power of 13.6 to 49.1 MBH/4 to 14.4 kW, the unit features operational efficiencies up to 99.4 per cent, and can be installed without a gas connection, chimney, or boiler room. Automatic outdoor temperature sensor and warm weather shutdown can be used to keep remote locations warm without using excess energy.

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Tech support app

Valves

iDROSET valves from Watts use patented flow measuring technology. The calibrated flow measurement and static balancing valve lets users set and read the flow without any additional tools or instrumentation. The valve features a large, easy-to-read gauge that continuously indicates flow, while a twist of the ergonomic hand wheel sets flow and can be locked when the desired flow rate is set. Each valve is factory calibrated to ensure a minimum of +/- 10 per cent flow rate accuracy. It is available in standard alloy with F-NPT connections for hydronic systems, and lead-free alloy with union connections for hot water recirculation systems.

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Air separators

The Taco 4900 Series Bronze air separators are designed for the elimination of air from closed loop heating and cooling systems up to a maximum temperature of 240°F and a maximum pressure of 150 PSI. The series is based on the PALL ring process. The ultimate micro-bubble separation of the process eliminates the damaging effects and irritating noise caused by unwanted system air.

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