General Description

Orifice flanges are intended for use instead of

standard pipe flanges when an orifice plate or

flow nozzle must be installed.  Pairs of pressure

tappings  are  machined  into  the  orifice  flange,

making separate orifice carriers or tappings in

the pipe wall unnecessary.

Thermocouple Instruments Ltd's orifice range of

orifice  flanges  covers  all  standard  sizes  and

ranges,   and   all   common   flange   materials.

Flanges  are  available  in  socket  weld  or  weld

neck form, and are typically supplied with two

½"  NPT  tappings  in  each  flange.     Jacking

screws to ensure ease of removal of the primary

flow element are provided.

Orifice  plates  and  flow  nozzles  can  also  be

supplied.   See individual Product Data Sheets

for more information.

Orifice flanges may also be supplied complete

with bolting and gasket kits.

Materials

Thermocouple   Instruments   Ltd   can   supply

orifice flanges in a wide range of standard and

special materials, including:

ASTM A105 Carbon Steel

ASTM A350 LF2 Low Temp Carbon Steel

ASTM A182 F316 Stainless Steel

ASTM A182 F304 Stainless Steel

ASTM A182 F11 1% Cr ½% Mo

ASTM A182 F22 2¼% Cr 1% Mo

NACE MR0175/ISO 15156, NACE MR 0103 compliance

Pressure Tappings

As standard, two ½" NPT tappings are provided

in each flange, one with a plug.   Other thread

sizes  are  available  on  request.    Socket  weld

connections  may  be  specified,  and  butt  weld

pipe  nipples  are  also  available.    Tappings  are

generally 'flange' type, but corner tappings are

optional.