Type of fitting

Pipe straight length

Pipe diameter, mm

Conformance to Standard [5] -[9]

Actual

Minimum А

Minimum B

Fit. downsrt.

of PD

L2,

mm

4690

3069

1535

511.27

YesU'L = 0

(see comment 1)

L/D

9.17

6.00

3.00

TT downstr.

of PD

Lt2,

mm

4070

2556

YesU'Lt = 0

L/D

7.96

5.00

L1,

mm

10700

7160

1535

511.27

YesU'L = 0

L/D

20.93

14.00

3.00

Fit.1

Single 90˚ bend

L3,

mm

6440

22757

11506

511.27

No

(see comment 2)

L/D

12.60

44.51

22.50

Fit.2

Gate valve

L4,

mm

2240

2557

0

511.27

L/D

4.38

5.00

0.00

Fit.3

Indefinite type of fitting

(see comment 3)