In order to ensure proper screwed pipe connections, several basic pre requisites must  be met in the assembly of all screw connection system. Improper assembly may lead  to malfunctions and impair safety.

Saw off pipe at a right angle. Deviation of angle pipe axis of up to 1/2 ⁰ is permissible. do not use pipe cutter.

Lightly de burr pipe in the inside and outside of the cut edges. Bevel angle of up to 0.2 x 45⁰ is permissible. Remove chips and particles.

For pipe bends, the minimum height from the straight pipe end to the bending radius must be noted. this must be at least twice the height of the union nut.

Pipes of rustproof steel must be pre - assembled in hardened pre - assembly connection pieces or the correction responding devices. this can also be recommended for serial assembly using components  of other materials.

Lightly grease the threads of the union nut, thread and cone of the pre - assembly connection piece and the cutting ring, using, for example anti sizes agent

Side union nut and cutting ring onto the pipe. Ensure that the cutting ring is positioned correctly (see drawing below).

Screw the union nut onto the pre - assembly connection piece as far as possible by hand. At the same time , press the pipe against the stop. As soon as the cutting ring has cut into the pipe , the tightening moment will increase noticeably. A flag at the union nut facilitates the observation of the necessary revolutions. Tighten union nut using a wrench by approx. 1 1/4 revolution.

Insert the pre - assembled pipe into the screwed connection piece. tighten union nut approx, 1/2 revolution beyond the point at which the tightening moment increases noticeable, holding the screwed connection piece with a wrench.