Gaskets; Basic Mounting Procedure - ABB MINI-MAG 10D1475 Series Instruction Manual

10D1475 MINI-MAG MAGNETIC FLOWMETER INSTRUCTION MANUAL

2.3.4 Gaskets

Use only the gaskets supplied with the instrument. The gaskets supplied with the meter are the
proper size for the meter size and type specified. When installing the meter it is important that the
correct size gaskets be utilized. Use of the wrong size gaskets could allow the inner diameter of the
gasket to protrude into the flow stream, thereby altering the flow profile within the meter. This
condition could affect meter accuracy significantly and must be avoided. Using the proper gaskets
and installing them correctly will also avoid any possibility of leakage. Observe parts information
given in Section 6.0.
Under certain conditions they may cause an electrically conductive layer to form on the
inside wall of the meter, causing meter operation to degrade.

2.3.5 Basic Mounting Procedure

Refer to Figure 2-6 to supplement the following procedure.
1. Insert both of the two lower mounting studs through the clearance holes in the pipe flange,
so that approximately half the stud length extends past the flange face. (Start with either the
upstream or downstream flange, as convenient.)
3. Install a gasket next to the flange face.
4. Slip an adaptor sleeve* on both of the mounting studs, and then install the other gasket
required. The two mounting studs can now be guided through the clearance holes in the
downstream (typical) gasket and its associated flange.
*Exception: Adaptor sleeves are not required for size 1/10 to 3/8 in. meters placed between
ANSI pipeline flanges.
5. Place the MINI-MAG Magnetic Flowmeter between the two flange gaskets, with the meter
resting on the two adaptor sleeves. The meter must be oriented in accordance with the
flow direction arrow.
6. Install the two upper mounting studs and adaptor sleeves as shown in Figure 2-6. Note
that when the sleeves are properly located, only four adaptor sleeves are needed for
positioning the meter. In systems with an 8-bolt flange pattern, insert the four remaining
mounting studs through the clearance holes in the upstream and downstream flanges.
7. Thread nuts on both ends of the 4 (or 8) mounting studs, finger-tight.
8. As the meter body is positioned properly by the adaptor sleeves, it is only necessary to
tighten the stud nuts to complete the mounting procedure. Tighten the nuts in a "star" pattern
as shown in Figure 2-5 and in even increments; to produce an even pressure distribution
around the flange faces. Bolt torque should be limited to the recommended values shown in
Table 2-1.
2-8
CAUTION
Do not use graphite gaskets.
INSTALLATION