Recommended working pressures – pressure rating PSI We manufacture stainless steel fittings with thread types NPT, BSPP, BSPT and NPTF(fuel), male and female end connections in imperial or metric sizing. Parallel female threads are machined with a flat bottom face to accommodate an internal seal. Male threads are machines with a tapered undercut to centralise the gasket during assembly. These threads are not designed to seal on the thread, they are designed to seal on adjacent faces by the use of a gasket. ISO taper pipe threads are similar in appearance to NPT threads, therefore care should be taken not to mix these threads. ISO-BST Taper Pipe Threads (ISO 7/1 and BS21.) NPT Taper Pipe Threads (ANSI/ASME B1.20.1) Other types of sealant should be used in accordance with the manufacturers recommendations. It is recommended that 3-5 rounds of tape are applied in the direction of the thread to ensure adequate coverage and leak tightness of the joint is achieved. White tape is used on NPT threads up to 3/8”, while green ‘oil-free tape’ can be used on oxygen lines and other specific medical-related gasses.Įxcess usage can cause the prevention of thread mating, disabling the ability for full joining of couplings. Within the UK, tape is used from coloured reels that correspond for certain applications.ĮG. It is often used to correspond to colour coded pipelines within Canada, Australia and New Zealand. The second is the commercial grade, A-A-58092 which maintains the thickness requirement of the first specification while adding a minimum density factor. The first is a military specification that requires a minimum thickness of 3.5 mils (thousandth of an inch). There are two standard types of PTFE tape within the US. This method is commonly used in industrial applications for pressurised water and air compression systems. This sealing practice is used to make tightening easier, thanks to its lubrication of the connection. PTFE tape, also known as plumber’s tape or thread seal tape, works as a deform-able filler and lubricant to help the sealing of joints. The correct sealant compatible with the application should be selected, the most widely used being PTFE tape. Thread tape is appropriate for use on tapered threads (pipe fitting or component piece with screw-threaded ends for assembly.) A thread sealant is essential for this type of joint, that will also act as a lubricant to prevent galling during assembly. These threads function by mating the male and female taper threads together, causing an ‘interference’ fit, where pressure-tight joints are made on the threads. There are two types of pipe thread, taper and parallel. Throughout the fittings industry there are many types of connection threads used, the most common being, ‘pipe threads.’
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