Recently my team has installed an orifice FT on a saturated steam line 6barg (max) The straight runs upstream / downstream are adequate however the vendor says the installation orientation is improper
In the attachment; top is what vendor wants & existing setup is shown below

Kindly explain what is the justification for this change?

 

1. The bottom photo lacks a wet leg for isolating the transmitter from direct steam impingement.

The transmitter needs to be protected from direct steam which will cook and destroy the electronics.

A wet leg is used to isolate the transmitter from the steam by a column of water.

The column of water in each leg has to be the same elevation, applying the same hydrostatic pressure to each side of the DP cell in order to not have an error due to water differences.

Rotating the assembly 90 Degrees CCW will achieve part of a wet leg (no drip tube or drain, no isolation valves, no 3 valve manifold.)

2. The bottom photo lacks isolation valves and a 3 valve manifold for zeroing the transmitter.

3. Every industrial site I've been on would insist on conduit for power and signal cabling.

4. Radiant heat from the uninsulated steam piping directly under the transmitter in the bottom photo might well cook the transmitter to death. Heat kills electronics.

5. The top photo appears to lack a mechanical mounting bracket to bear the weight of the tubing/pots/manifold valve/transmitter

 

In photo B, it appears that you have branch piping connections less that two pipe diameters from the meter connection on either side. You might also explain the details of the in line flow metering device, as it is definitely not an orifice plate.

Process conditions P, T, and flow rates are also essential, for flow metering.

By the way where are your steam traps located....