Pressure and vacuum instrumentation is generally supplied with either BSP (British Standard Pipe) or NPT (National Pipe Thread). BSP is mostly supplied in a parallel configuration so the pressure tight seal is made using a sealing washer. The choice of the sealing washer material depends on the pressure and the medium being used. In addition a tapered BSP thread is also available. NPT Threads are always tapered so the pressure tight seal is made on the threads. Sealing tape such as PTFE can also be used.
BSP Process Connections – BSP (British Standard Pipe) – Parallel:
BSP is the most common process connection in the UK. It is a parallel thread so the pressure tight seal is made using a sealing washer. The choice of the sealing washer material depends on the pressure and the medium being used. The most commonly used sizes are 1/8, 1/4, 3/8 and 1/2 inch BSP. Details including physical sizing and TPI (Threads per Inch) are below. If you require information on an alternative BSP connection size please contact us.
This information page provides details on the standard range of BSP connections, 1/8″, 1/4″, 3/8″ and 1/2″ .We can also supply other BSP sized threads please contact us.
NPT Process Connections – NPT (National Pipe Thread) – Tapered:
NPT is the most common process connection in the USA and in the oil and petroleum industries. It is a tapered thread so the pressure tight seal is made on the thread itself. The most commonly used sizes are 1/8, 1/4, 3/8 and 1/2 inch NPT. Details including physical sizing and TPI (Threads Per Inch) are below. If you require information on an alternative NPT connection size please contact us.
This information page provides details on the standard range of NPT connections, 1/8″, 1/4″, 3/8″ and 1/2″. We can also supply other NPT sized threads, please contact us.
BSP Tapered Process Connections – BSP (British Standard Pipe) – Tapered:
BSPT is not commonly used with pressure and vacuum instrumentation, we are however able to provide gauges with BSPT connections. It is a tapered thread so the pressure tight seal is made on the thread itself. The most commonly used sizes are 1/8, 1/4, 3/8 and 1/2 inch BSPT. If you require information on BSPT connection sizes please contact us.
You can also download our fully detailed Process Connection Data Sheet.