# API Std 650 - Flush-type Shell Connection (in)

Written by Jerry Ratzlaff on . Posted in American Petroleum Institute

## standards

• API Std 650 - Standard for Welded Tanks for Oil Storage

• [a] For circular openings, this valve will be 1/2 of the ID based on nozzle neck specified.
Class 150

Nominal

Height of

Flange Size

(NPS)

Height

of

Opening

$$h$$

Width

of

Opening

$$b$$

Arc Width

of Shell

Reinforcing

Plate

$$W$$

Upper Corner

Opening

$$r_1$$

Lower Corner

Reinforcing

Plate

$$r_2$$

8 8 5/8 8 5/8 38 4 [a] 14
12 12 3/4 12 3/4 52 4 [a] 18
16 12 20 64 6 18
18 12 22 66 6 18
20 12 25 69 6 18
24 12 36 89 6 18