Emerson 3051S Dokumentacja Pobierz pdf (Strona 118)

Reference Manual

00809-0100-4803, Rev DA

Section 4: Operation and Maintenance

April 2013

Operation and Maintenance

Note

If the installation uses a manifold, see “Manifold Operation to Zero the Differential Pressure

Sensor” on page 20.

1. Inspect the SuperModule PTFE o-rings. If the o-rings are undamaged, they may be

reused. Emerson Process Management recommends reusing o-rings if possible. If the

o-rings show any signs of damage, such as nicks or cuts, they should be replaced (part

number 03151-9042-0001 for glass-filled PTFE and part number 03151-9042-0002 for

graphite-filled PTFE).

Note

If replacing the o-rings, be careful not to scratch or deface the o-ring grooves or the surface of

the isolating diaphragm when removing the damaged o-rings.

2. Install the process flange on the SuperModule process connection. To hold the process

flange in place, install the two alignment cap screws finger tight (these screws are not

pressure retaining). Do not overtighten; this will affect module-to-flange alignment.

3. Install the appropriate flange bolts.

a. If the installation requires a

/4–18 NPT connection(s), use four 1.75-in. flange bolts.

Finger tighten the bolts. Go to Step d.

b. If the installation requires a

/2–14 NPT connection(s), use flange adapters and four

2.88-in. process flange/adapter bolts.

c. Hold the flange adapters and adapter o-rings in place while finger-tightening the bolts.

d. Tighten the bolts to the initial torque value using a crossed pattern. See Tab le 4 -1 for

appropriate torque values.

e. Tighten the bolts to the final torque value using a crossed pattern. See Tab le 4- 1 for

appropriate torque values. When fully tightened, the bolts should extend through the

top of the module housing.

f. Torque alignment screws to 30 in-lbs. (3.4 N-m). If the installation uses a conventional

manifold, then install flange adapters on the process end of the manifold using the

1.75-in. flange bolts supplied with the transmitter.

Table 4-1. Bolt Installation torque values

4. If the SuperModule PTFE o-rings are replaced, re-torque the flange bolts and alignment

cap screws after installation to compensate for seating of the PTFE o-ring.

Bolt Material Initial Torque Value Final Torque Value

CS-ASTM-A449 Standard 300 in-lb. (34 N-m) 650 in-lb. (73 N-m)

316 SST—Option L4 150 in-lb. (17 N-m) 300 in-lb. (34 N-m)

ASTM-A-193-B7M—Option L5 300 in-lb. (34 N-m) 650 in-lb. (73 N-m)

Alloy K-500—Option L6 300 in-lb. (34 N-m) 650 in-lb. (73 N-m)

ASTM-A-453-660—Option L7 150 in-lb. (17 N-m) 300 in-lb. (34 N-m)

ASTM-A-193-B8M—Option L8 150 in-lb. (17 N-m) 300 in-lb. (34 N-m)

1 2 ... 113 114 115 116 117 118 119 120 121 122 123 ... 187 188

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