Design, Butt Weld Ends

98
Reheater Isolating Device
Features and Benefits
Single seal
preloading
screw
Captive
lever
Eyebolts
‘O’ ring seal
on face
The Components
The Isolating Closure consists of two principal pieces,
isolating disc and backing plate. The preloading bolt
(see Detail) is threaded into the backing plate. As the
preloading bolt head is turned, it comes in contact with
the face opposite the seat. From this point the top of
the backing plate is forced away from the face opposite
the seat, pivoting about the dome nut, until the bottom
of the plate comes into contact with the face opposite
the seat. Additional turning of the preloading bolt head
results in the dome nut applying axial seating pressure
to the isolating disc.
Isolating Closure Installation
The Isolating Closure is designed to be handled as one
assembly. There are two eye bolts on the disc to assist in
installation. The backing plate is held to the disc by two
cap screws, but the backing plate is free to move axially.
The Isolating Closure is lowered into the body, the
preloading bolt tightened, which seats the “O” ring to
the body. After the pressure seal assembly has been
installed, the system is ready for hydrostatic testing. The
testing pressure will cause the ring to seal even more
tightly.
Down stream leakage, past the “O” ring, should it occur
can be determined by removing the pipe plug at the
bottom of the body.
After hydrostatic testing, the Isolating Closure is
removed and the pressure seal assembly reinstalled.
What the Dewrance Reheater Isolating
Device Offers:
To the Specifying Engineer, an Alternative!
Whether for new construction or retrofit, there is now a
workable choice other than blanking flanges for
isolating a section of pipeline.
To the Maintenance Engineer, Ease of Operation!
One unit permits an efficient means of doing hydrostatic
testing, wet or dry lay-up and chemical cleaning.
To the Plant Chief Engineer, Savings Through Efficiency!
Compared with the blanking flange method, the
Isolating Closure is clearly better. Furthermore, it will pay
for itself. Upon completion of the second operation the
accumulated savings in reduced down-time and
maintenance labour could cover the purchase cost.
To the Plant Operations Manager, Increased Profitability!
Consider the versatility, efficiency and savings of the
Dewrance Reheater Isolating Device, then the impact on
the “bottom line” is self evident.