TEES (STATE STANDARD 8948-75)
ELBOWS (STATE STANDARD 8946-75 )
REDUCERS OR REDUCING COUPLINGS (STATE STANDARD 8957-75)
Figure 4.29 – Conventional drawings of reducing coupling
Table 4.15
| Nominal bore, Dy, mm | Threads G1хG2, inch | L, mm | l , mm | l1, mm | l2, mm | D1, mm | D2, mm | D3, mm | D4, mm | b, mm | b1, mm | b2, mm | h, mm | Number of ribs |
| 20х10 | 3/4 х3/8 | 3.5 | ||||||||||||
| 20х15 | 3/4х1/2 | 3.5 | ||||||||||||
| 25х15 | 1 х 1/2 | |||||||||||||
| 32х15 | 1 х1/2 | 48.5 | 2.5 | 2.5 | ||||||||||
| 32х20 | 1 х3/4 | 48.5 | 32.5 | 2.5 | 2.5 | |||||||||
| 32х25 | 1 х 1 | 48.5 | 39.5 | 2.5 | 2.5 | |||||||||
| 40х20 | 1 х3/4 | 55.5 | 32.5 | 2.5 | 2.5 | 4.5 | 2.5 | |||||||
| 40х25 | 1 х 1 | 55.5 | 39.5 | 2.5 | 2.5 | 4.5 | 2.5 | |||||||
| 50х25 | 2х1 | 2.5 |
The example of the conventional denotation of a reducing coupling with the nominal bore 20 mm: Reducing Coupling 20 State Standard 8957-75.
Figure 4.30 – Conventional drawings of an elbow
Table 4.16
| Nominal bore, Dy, mm | Thread G, inch | L, mm | l , mm | D1, mm | D2, mm | b, mm | R1, mm | R2, mm | R3, mm | R4, mm | S, mm |
| 3/8 | 10.0 | 2.0 | 6.5 | 23.5 | 2.5 | ||||||
| 1/2 | 12.0 | 28,6 | 26,6 | 2.0 | 2,7 | 5,5 | 26,5 | 29,3 | 2.8 | ||
| 3/4 | 13.5 | 34,9 | 32,4 | 2.5 | 3.3 | 6,3 | 32,8 | 35,7 | 3.0 | ||
| 15.0 | 42,1 | 39,6 | 2.5 | 3.2 | 6,5 | 39,5 | 42,8 | 3.3 | |||
| 17.0 | 3.0 | 3,4 | 52,6 | 3.6 | |||||||
| 19.0 | 3.0 | 60,5 | 4.0 | ||||||||
| 21.0 | 70,5 | 3.5 | 2,5 | 71,5 | 4.5 |
The example of the conventional denotation of an elbow with the nominal bore 20 mm: Elbow 20 State Standard 8946-75.
Figure 4.31 – Conventional drawings of a tee
Table 4.17
| Nominal bore, Dy, mm | Thread G, inch | L, mm | l , mm | D1, mm | D2, mm | b, mm | R1, mm | R2, mm | S, mm |
| 3/8 | 10.0 | 2.0 | 6.5 | 2.5 | |||||
| 1/2 | 12.0 | 28.6 | 26.6 | 2.0 | 2.7 | 5.5 | 2.8 | ||
| 3/4 | 13.5 | 34.9 | 32.4 | 2.5 | 3.3 | 6.3 | 3.0 | ||
| 15.0 | 42.1 | 39.6 | 2.5 | 3.2 | 6.5 | 3.3 | |||
| 17.0 | 3.0 | 3.4 | 3.6 | ||||||
| 19.0 | 3.0 | 4.0 | |||||||
| 21.0 | 70.5 | 3.5 | 2.5 | 4.5 |
The example of the conventional denotation of a tee with the nominal bore 20 mm: Tee 20 State Standard 8948-75.
The drawing of a joint is begun with the drawing of a pipe, then the view of connecting parts are drawn according to the sizes in tables (4.12 – 4.17). A pipe on the drawing is shown by not screw up in a connecting part on 2-4 mm (1-2 threads), that is why a thread on a pipe is at the face of the connecting part. Figure 4.32 shows the drawing of the pipe joint by a pipe coupling. An external thread on a pipe is drawn the same as on the bar of a bolt by a continuous contour line on the most diameter and by a continuous thin line on the internal diameter of a thread. Such view of a thread on a pipe will be in joint with other parts.
Figure 4.32 – Pipe joint by a pipe coupling
An internal thread in connecting parts remains unchanging only in the places not taken by the pipe.