Ashcroft 80-81 - Isolation Rings - Manual (Page 8)

8
Type 81 Bolt-Thru
(Installed View)
Prior to installation, please follow the recommended manufacturer procedure:
A. Confirm process has been shut down with process pressure relieved and piping drained.
B. Provide pipe flange gasketing, mounting bolts, lockwashers and nuts (not supplied by Ashcroft).
Step 1: Isolation ring and flange gaskets should be centered between process piping flanges.
For Type 80 Wafer: Assembly is installed by placing centering gages (shims) on the two bottom-most flange
bolts; these are supplied by Ashcroft with each isolation ring assembly. Refer to the following table for cen-
tering gage size based on flange class rating. Note: Centering gauges may be removed afterwards by
breaking.
Step 2: Position Type 80 Wafer isolation ring with centering-gages or Type 81 Bolt-Thru using two bottom-
most bolts through unit and process flanges. Take care to ensure that any attached instruments are directed
in a vertical (upward) configuration, while measuring devices (e.g. gauge, switch, transducer) are also posi-
tioned between the two upper-most flange bolts to prevent obstruction with the process piping.
ANSI/ASME
NPS
CENTERING
CLASS RATING GAGE SIZE
Class 150 All Sizes 1/8˝
2˝ 1/4˝
3˝ 3/8˝
4˝ 1/4˝
6˝ 11/16˝
8˝ 11/16˝
Class 300 10˝ 9/16˝
12˝ 3/8˝
14˝ 13/16˝
16˝ 5/8˝
18˝ 1-1/16˝
20˝ 1-1/16˝
I&M008-10223_USER_layout 6/17/14 3:27 PM Page 8