Page 57 - Pipeline Rules of Thumb Handbook

44 Pipeline Rules of Thumb Handbook

Figure 4. Crossing under foreign lines with offset bends.

08 R Bend radius (ft)
Figure 1. Cold offset bends.
09 V Vertical distance desired (ft
between center lines)
10 T Tangent (ft)
11 Incr. Bend angle increment in degrees
12 H Horizontal distance, overall (ft)
13 L Length of pipe (ft)
14 V Calc. Vertical distance calculated (ft)
15 R(1 - cosTrap )
16 TsinTrap
17 RsinTrap
18 TcosTrap
Trap

19 R 57.2958
20 VL Vertical distance to launcher trap
connection (ft)
Figure 2. Pipe direction change.
21 HL Horizontal distance to launcher
trap connection (ft)
Legend & registers
Reg. no. 22 LL Length of pipe to launcher trap
00 Not used connection (ft)
01 LRT Length of receiver trap (ft) 23 VR Vertical distance to receiver trap
02 LLT Length of launcher trap (ft) connection (ft)
R Radius of bend/pipe diameter 24 HR Horizontal distance to receiver
03 trap connection (ft)
D (ft/ft) 25 LR Length of pipe to receiver trap
04 Trap Scraper trap angle in degrees connection (ft)
05 1 Bend angle in degrees 26 VLT Vertical distance to end of
06 D—in. Pipe diameter (in.) launcher trap (ft)
07 D—ft Pipe diameter (ft) 27 HLT Horizontal distance to end of
launcher trap (ft)
28 VRT Vertical distance to end of
receiver trap (ft)
29 HRT Horizontal distance to end of
receiver trap (ft)
30 Change direction desired in
degrees
31 Radius Change direction (ft)
32 Tangent Change direction (ft)
33 V Vertical distance calculated,
change direction
34 H Horizontal distance calculated,
change direction
35 L Length of pipe calculated, change
Figure 3. Scraper traps. direction.