Manifold Operation - Emerson Rosemount WPG Reference Manual

Hardware Installation
March 2016
Note
If using thread tape, be sure the thread tape does not strip when the manifold assembly is
started.
5.
6.
7.
8.
9.
2.7.2

Manifold operation

2-Valve and Block and Bleed Style Manifolds
Isolating the device
In normal operation the Isolate (block) valve between the process port and device will be
open and the Test/Vent valve will be closed. On a block and bleed style manifold, a single
block valve provides device isolation and a bleed screw provides drain/vent capabilities.
Isolate
12
Wrench tighten manifold into process connection (minimum toque value is
425 in-lbs).
Count how many threads are still showing (minimum engagement is 3
revolutions).
Subtract the number of threads showing (after tightening) from the total threads
to calculate the revolutions engaged. Further tighten until a minimum of 3
rotations is achieved.
For block and bleed manifold, verify the bleed screw is installed and tightened. For
2-valve manifold, verify the vent plug is installed and tightened.
Leak-check assembly to maximum pressure range of device.
Device
Process
(open)
Test/vent
(closed)
Reference Manual
00809-0100-4045, Rev AB
Hardware Installation