overview :: threaded :: flanged :: flanged threaded

These observation ports are for low-pressure applications only.

The Blast Gate Observation Ports use the Tate-Jones standard line of blast gates as the primary components and incorporate a mating flange, gaskets, and the glass lens which is secured by a metal retaining ring.

The stainless steel slide arrangement in the blast gate gives added protection and life to the lens during operations, and allows maintenance to be performed with added safety during vessel down-time.

Additional cooling can be obtained by adding a purge connection on the glass or vessel side of the blast gate housing.

Three choices of glass are available for varying temperature exposures and viewing requirements.

American Standard 125 flange pattern observation ports are available in 4″ to 12 ” sizes.

The standard unit is a Class 30 gray iron with maximum temperature of 425 °F. Custom units made from Carbon Steel and Stainless Steel by special order.


Flanged Blast Gate Valves

Pipe Size

Viewing Area

A

B

C

D

E

F

G

Bolt Size

Bolt
Circle

Unpacked Weight

Part Numbers

4″ 3-9/16″ dia. 15-1/4″ 4-1/4″ 4-9/16″ 5-5/16″ 5-3/4″ 9″ 4-1/4″ 5/8″ 8 on 7-1/2″ 28 # 4FBGOP
6″ 5-9/16″ dia. 23″ 4-3/4″ 5-1/16″ 5-13/16″ 9″ 11″ 6-1/4″ 3/4″ 8 on 9-1/2″ 59 # 6FBGOP
8″ 7-9/16″ dia. 28-1/2″ 5-1/8″ 5-7/16″ 6-3/16″ 11″ 13-1/2″ 8-1/4″ 3/4″ 8 on 11-3/4″ 87 # 8FBGOP
10″ 9-1/2″ dia. 31-3/4″ 5-3/8″ 5-11/16″ 6-7/16″ 13-1/2″ 16″ 10-3/8″ 7/8″ 12 on 14-1/4″ 136 # 10FBGOP
12″ 11-1/2″ dia. 37-1/4″ 6-3/8″ 6-11/16″ 7-7/16″ 16″ 19″ 12-5/8″ 7/8″ 12 on 17″ 190 # 12FBGOP

Glass Options

Type

Thickness

Max. Intermittent Temperature

Max. Continuous Temperature

Code
Letter
Vycor Blue (limited) 1/4″ 2192 °F / 1200 °C 1652 °F
/ 900 °C		 VB
Quartz Clear 1/4″ 2048 °F / 1120 °C 1600°F / 871 °C Q
Pyrex Clear 1/4″ 554°F / 290 °C 446°F
/ 230 °C		 P