6/08 ST 3000 Release 300 and SFC Model STS103 User’s Manual 173
9.3 Inspecting and Cleaning Barrier Diaphragms, Continued
Procedure, continued

Table 53 Inspecting and Cleaning Barrier Diaphragms, continued

Step Action
6
Coat threads on process head bolts with anti-seize compound such
as “Neverseize” or equivalent.
7 Replace process head or heads and bolts. Finger tighten nuts.
8
Use a torque wrench to gradually tighten nuts to torque rating shown
in Table 48 in sequence shown in following illustration. Tighten head
bolts in stages of 1/3 full torque, 2/3 full torque, and then full torque.
1
2
4
3
Always tighten head bolts in
sequence shown and i n these
stages:
1. 1 / 3 full t orque
2. 2 / 3 full t orque
3. Full torque
9
Return transmitter to service.
CAUTION Do not exceed the overload rating when placing the
transmitter back into service or during cleaning operations. See
Overpressure ratings in Section 3 of this manual.
Continued on next page