Tightening Flange Bolts; Equalization And Grounding (Metal And Plastic Pipe) - Seametrics AG3000p Instructions Manual

Tightening Flange Bolts

NOTE: Mating pipe flanges must be ANSI 150# full face (FF)
and/or raised face (RT).
1. Tighten flange bolts in an alternating pattern.
• Tighten left flange bolt-1 to 20% recommended
torque.
• Tighten right flange bolt-1 to 20% of
recommended torque.
• Repeat steps a and b for each bolt in an
alternating order, such as shown at right,
tightening to 40%, then 60%, then 80%, and
then 100%.
2. Test for leaks.
3. If needed, tighten further in 10% increments
until leaking stops. DO NOT over-tighten. Over-
tightening can cause serious damage to the flow
meter.
4. Recheck after 24 hours, adjusting if needed.
1
8
5
4
3
7
6
2
Suggested
Tightening Sequence
CAUTION: Improper tightening sequence can cause
serious damage to the flow meter.
• Do not tighten one side at a time.
• Do not tighten each bolt completely at one time.
ATTENTION: Une séquence de serrage incorrecte peut endommager
gravement le débitmètre.
• Ne serrez pas un côté à la fois.
• Ne serrez pas complètement chaque boulon en une seule fois.
Equalization and Grounding
WARNING: ELECTRICAL SHOCK HAZARD
When the iMAG is installed in a plastic piping system,
or when externally powered, the piping system must
be grounded to meet national and local electrical safety
codes. Failure to do so can result in electrocution.
AVERTISSEMENT: RISQUE D'ÉLECTROCUTION
Lorsque l'iMAG est installé dans un système de tuyauterie en plastique,
ou lorsqu'il est alimenté de manière externe, le système de tuyauterie
doit être mis à la terre pour respecter les codes de sécurité électriques
nationaux et locaux. Ne pas le faire peut entraîner une électrocution.
Metal Pipe Installations. To equalize the electrical potential
of the fluid, the AG3000 meter, and the surrounding pipe, secure
the flange plates (factory-installed on the equalization wire) to
both pipe flanges at one of the bolt holes, as shown below.
Seametrics • 253.872.0284
SUGGESTED FLANGE BOLT TORQUE
Liner
Pipe Size ft-lb Nm
2" 18 25
3" 25 34
4" 20 27
6" 42 57
8" 65 88
10" 73 99
12" 97 132
Be sure the lock washer fits between the pipe flange and the
flange plate. For the best electrical bonding, remove rust
and paint to expose clean, bare metal where the equalization
flange plate lock washer contacts the pipe flange. Connection
must be inspected periodically for corrosion to maintain the
necessary low resistance connection.
Meter Flange
Gasket
Pipe Flange
Lockwasher
Flange Plate
Equalization Lug
Meter
Flange
Metal Pipe
Gaskets
Plastic Pipe and Electronically Noisy Installations.When
the meter is installed in plastic pipe or in an electrically noisy
system (near a VFD etc.), grounding rings are recommended.
As shown in the diagram below, the equalization wires should
be solidly connected to the grounding ring tabs instead
of the flange bolts as in metal piping installations. Where
lightning is a threat, or in severe electrical environments,
an optional connection to a nearby equipment ground or
ground rod may be advisable.
Equalization Lug
Grounding Ring
Gaskets
Plastic
Pipe
#6, #8, or #10 AWG Stranded
Copper Ground Wire < 5'
Although grounding rings will not be necessary on all
installations, adding grounding rings to any meter at the
time of installation will make the diagnosis and elimination
of excessive noise or transient voltages much easier if found
during normal operation of the meter site.
Adding a 5/8" x 8' independent ground rod dedicated to
the meter, a ground rod clamp, and connecting them with
at least 10 GA ground wire may be necessary when electrical
noise is present, but unlike grounding rings, ground rods are
easy to add after the fact although installing these during
meter installation adds insurance that a meter will encounter
less noise and will help protect against large electrical spikes.
Lack of grounding will always cause more problems than
grounding loops.
Page 10
AG3000p INSTRUCTIONS
Pipe
Flange
Metal Pipe
Grounding Ring Part Numbers:
2" = 104124 6" = 100877
3" = 102157 8" = 100878
4" = 100876 10" = 100879
12" = 103288
Grounding Ring
Gaskets
Plastic
Pipe
Ground Clamp
(Exothermically weld when
corrosion is a concern)
Earth
8' Ground Rod
seametrics.com