Bolting Removal; Bolting Installation - ABB Platinum standard Series Product Instruction

REPAIR AND REPLACEMENT PROCEDURES

Bolting Removal

Bolting Installation

COMPONENT REMOVAL AND INSTALLATION PROCEDURES
8 - 8
1. Remove the transmitter from the process.
2. Using the adjustable end wrench, remove four of the pro-
cess flange nuts from either side of the process flange
(Fig. 8-2).
3. Remove the process flange studs (Fig. 8-2).
4. Remove the process O-rings.
1. Refer to Section 9
O-rings (Fig. 8-2) for the application.
2. Coat the process O-rings with a film of Dow Corning No. 4
compound and install.
3. Using the new process flange studs and process flange
nuts, finger tighten four of the process flange nuts on the sides
of each of the four process flange studs with the least threads
until the process flange nuts are at the bottom of the threads.
4. Insert the process flange studs into the flange and cell
assembly until the process flange nuts already installed come
in contact with the process flange.
5. Starting with one of the other four process flange nuts, fin-
ger tighten it only until it comes in contact with the process
flange.
6. Proceed in the same manner with the remainder of the pro-
cess flange nuts, operating diagonally two by two.
7. Working diagonally two by two, tighten the process flange
nuts in 25% increments until reaching a value of 65 to 69 Nm
(48 to 52 ft-lbs) for stainless steel and NACE nuts, 78 to
82 Nm (57 to 61 ft-lbs) for carbon steel nuts, or 179 to 191 Nm
(131 to 141 ft-lbs) for high static pressure nuts.
NOTE: If the O-rings are PTFE, tighten to the same torque again
after five days . This is necessary due to the cold flow properties of
PTFE. Tests have shown that a loss of torque of as much as
40 percent occurs over the five days. After a second tightening, no
loss of torque is apparent.
8. Perform the calibration checks in
calibration has not changed.
9. Install the transmitter on the process.
and determine the proper process
Section 4 to verify the
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