| There are two types of insert flanges, Reducing
and Non-Reducing. The flanges consist of two separate parts: a hub -- the insert
-- and a backing flange which is free to rotate (assuring bolt hole alignment during
installation). In both types, the core pipe is welded front and back to the hub, as with
any slip-on flange. The jacket, which heats the core pipe as well as the hub, is welded to
a machined land on the back of the hub that matches the nominal size and schedule of the
jacket pipe. Reducing Insert Flanged Jacketed Pipe has the same sizing requirements
as Standard Jacketed Pipe. The backing flange size matches the nominal size of the jacket
pipe. If equipment must mate with the Reducing Insert Flange, it requires oversize
flanges. Non-Reducing Insert Flange Jacketed Pipe has the same sizing requirements as
Swaged Jacketed Pipe--it allows the use of core-size equipment. Unlike Swaged Jacketed
Pipe, it heats the back of the hub for more uniform temperature control. The Non-Reducing
Insert Flange demands more dexterity of installation personnel than the Reducing Insert
Flange. For this reason, many designers specify Reducing Flanges on pipe-to-pipe
connections and Non-Reducing Insert Flanges on pipe-to-equipment connections. |
|
 Non-Reducing Insert Flanged Jacketed Pipe
Reducing Insert Flanged Jacketed Pipe
|
