7.12.2. Manual drawing<br>

### 7.12.2. Manual drawing

The manner of placing polylines in the drawing with the AUTO mode disabled is the same as placing pipe feeds (see section 6.5.1):

- finding connection points of pipe feeds and HZ as the starting point for polylines,

- automatic determination for a pair of polylines in the data table the spacing in the drawing according to results obtained for the HZ

Snapping to grid is important when editing polylines and making modifications. Make sure that snapping to grid is enabled and check the grid spacing. The pipe spacing value should be a multiple of the grid spacing – if, for instance, pipes are to be arranged every 12.5 cm, and the grid spacing is 5 cm, it will not be possible to draw polylines spaced apart at the required distance.

Disabling the ORTO mode is recommended when modifying segments of polylines already placed in the drawing.

! Although polylines representing piping look in the drawing like pipe feeds and may form with them a whole on the printout, in calculations they are not treated as segments of heating pipes. In particular, they have no effect on heat and flow calculations and their connections are not checked.

This property of polylines makes them useful for drawing part of the heating circuit, so that the fitter understands the intentions of the designer. Some examples of the use of polylines in manual drawing of piping system in HZ’s are presented below:

1. Meander pipe pattern – drawing indicates the point from which pipe laying should start:

2. Spiral pipe pattern with occupied area. The polylines drawn indicate how irregularities should be taken into account – part of the room is covered by double meander pattern, which is shown in the drawing, the remaining part of the room, nearly square, is to be covered by a spiral pattern:

3. Circuit with an integrated PZ at the beginning, drawn to such extent as to indicate the type of peripheral zone (uPZ, not cPZ):