For pressures above 10.000 psi / 700 bar it is necessary to employ suitable connections for such demand.
Up to 15.000 psi / 1.000 bar specially prepared NPT conical thread connections are sufficient.
NPT is the most widely used connection thread in the oil industry. It has a taper of 1:16 (one part in 16 of the diameter), a 60º fillet and flat truncation. It is easy to seal with Teflon tape or paste sealers. It is governed by the ANSI B1.20.1 standard.
For higher pressures, employment of Cone & Thread connections is recommend.
Cone & Thread system
In this system, a male cone of small diameter presses against a female cone with a slight difference in angle. This forms a thin contact line that ensures a bubble-tight seal with a relative small force.
ABAC manufactures two types of Cone & Thread connections:
For pressures up to 22.500 psi / 1.550 bar the system is named MU, and for pressures up to 30.000 psi / 2.068 bar it is designated AU.
The figure below shows the technology and the difference between the two systems.
Pressure ranges
| Range | Pmáx psi | Recommended thread |
| Medium pressure | 15.000 | Conical NPT |
| 22.500 | MU Cone & Thread system | |
| High pressure | 65.000 | AU Cone & Thread system |
Connection threads
| Type | Standard | Sealing |
| Conical NPT | ANSI B 1.20.1 | Thread flank |
| Cylindrical | N/A | Male cone over female cone (see above Cone & Thread system) |
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