BS EN 1451-1-2017 pdf free download.Plastics piping systems for soil and waste discharge (low and high temperature) within the building structure – Polypropylene (PP) Part 1: Specifications for pipes, fittings and the system
7.3 Dimensions of fittings
7.3.1 Outside diameters
The mean outside diameter d em of the spigot end shall conform to Table 2 or Table 3, as applicable.
7.3.2 Design lengths
The design lengths of fittings (see Figure 6 to Figure 19) shall be declared by the manufacturer.
NOTE The design lengths of a fitting are intended to assist in the design of moulds and are not intended to be used for quality control purposes. ISO 265-1 [5] can be used as a guideline.
7.3.3 Wall thickness
The minimum wall thickness e min of the body or the spigot end of a fitting shall conform to Table 4 or Table 5, as applicable, except that a reduction of 5 % resulting from core shifting is permitted. In such a case the average of two opposite wall thicknesses shall be equal to or exceed the values given in Table 4 or Table 5, as applicable.
Where a fitting or adaptor provides for a transition between two nominal sizes, the wall thickness of each connecting part shall conform to the requirements for the applicable nominal size. In such a case the wall thickness of the fitting body is permitted to change gradually from the one wall thickness to the other.
Where a sealing ring is located by means of a retaining cap or ring (see Figure 2) the wall thickness in this area shall be calculated by addition of the wall thickness of the socket and the wall thickness of the retaining cap or ring at the corresponding places in the same cross-section.
The wall thickness of fabricated fittings, except for spigot end and socket, may be changed locally by the fabrication process, provided that the minimum wall thickness of the body conforms to e 3,min as given in Table 8 or Table 9, as appropriate for the pipe series S concerned.
7.4 Dimensions of sockets and pipe ends
7.4.1 Dimensions of ring seal sockets and spigot ends
7.4.1.1 Diameters and lengths
The diameters and lengths of ring seal sockets and spigot ends (see Figure 3, Figure 4 or Figure 5) shall conform to Table 6 or Table 7, as applicable, and shall be in accordance with the following conditions where sealing rings are firmly retained:
the dimensions for the minimum value for A and the maximum value for C shall be measured to the effective sealing point (see Figure 5 as an example). This point shall give a full sealing action.
-the requirements for dimension B (see Figure 4) do not apply.
Different designs of ring seal sockets (see Figure 4]) are permitted, provided the joints conform to the requirements given in Clause 10. .
7.4.2 Dimensions of pipe ends for butt fusion joints
The mean outside diameter d em and the wall thickness e of pipes with plain ends intended to be used for butt fusion joints shall conform to the same pipe series S, as specified in this standard.
7.5 Types of fittings
This European Standard is applicable for the following types of fittings. Other designs of fittings are  permitted.
a) Bends (see Figures 6, 7, 8, 9, 10 or 11)
— unswept or swept angle (see ISO 265-1 [5]);
— spigot/socket or socket/socket;
— butt fused from segments.
The fixed nominal angle α should be as follows: 15°, 22,5°, 30°, 45°, 67,5°, 80° or 87,5° to 90°.
b) Branches and reducing branches (branching single or multiple) (see Figures 12, 13, 14, 15, 16 or 17)
— unswept or swept angle (see ISO 265-1 [5])
— spigot/socket or socket/socket.
The fixed nominal angle α should be as follows: 45°, 67,5° or 87,5° to 90°.
If other angles are required, they shall be agreed between the manufacturer and purchaser and be identified accordingly.
c) Reducers (see Figure 18);
d) Access fittings (see Figure 19);
The inside diameter of the cleaning hole shall be as specified by the manufacturer.
e) Couplers
— double socket (see Figure 20);BS EN 1451-1 pdf download