INSTALLATION & MAINTENANCE BULLETIN No. 601
June 11, 2018 Rev.18
Installation Instructions
for
Line Mounted ROMET Meters
RM600 – RM56000 RM16 – RM1600 G10 – G1000
➢ This bulletin covers the general installation of all
ROMET rotary meters.
➢ A Romet meter is a precise gas volume measuring
instrument (cash register), manufactured to very
tight tolerances. Rough handling of the meter must
be avoided to prevent damage.
➢ To prevent external/internal damage, dirt or oil
contamination of the meter, always transport the
meter in a protective container with the meter
capped at both opening ends, including the
instrument drive assembly (if applicable), and
WITHOUT oil.
➢ Always add oil after the meter has been correctly
installed at the meter site.
➢ Installation of a Romet rotary meter is a relatively
simple procedure if the meter set is properly
constructed. The piping and flange position of the
meter set should be such that there is adequate
area spacing between the meter and any pipe, wall
or any other possible obstruction. This spacing will
allow for ease of maintenance or the addition or
removal of devices; such as, a meter module,
batteries or any other auxiliary instruments.
➢ Furthermore, all full faced pipe flanges installed
(raised flanges are not recommended) must be
level and spaced so that the meter together with
the top and bottom gaskets can be positioned
between the flanges easily and with the least
amount of air gap (maximum 1/16“ (1.6 mm) per
linear foot (30.5 cm) of flange) before tightening. If
the meter is not level, it is possible to improperly fill
the oil reservoirs or over-stress the meter after
tightening the flange bolts. This condition may
cause the meter to read incorrectly or result in
complete meter failure.
Care must also be taken to ensure that the piping
and flanges are aligned correctly in relation to the
meter (maximum 1/16“ (1.6mm) in all directions).
DO NOT use the meter to correct misaligned piping
or flanges. Excessive misalignment or distance
between piping or flanges may over-stress the
meter body when the flange bolts are tightened.
Severe over-stress may cause the meter to read
incorrectly or result in complete meter failure.
The use of a “spool piece” is recommended to help
level and align piping and/or flanges in relation to
the meter before meter installation. These spools
are available from Romet.
➢ To protect the meter (and any other critical
devices) from internal damage, the gas passing
through a meter set must be clean (i.e. free of rust,
scale, grease, pipe paste, wadding, weld beads,
etc.).
The use of a filter (e.g. Romet Screen “T” filter,
typically 60 mesh/250 micron size) or strainer
installed upstream of the meter set is strongly
recommended to insure adequate internal meter
protection.
➢ Before installing a Romet meter, a quick check
should be performed.
First, remove the meter from the protective
container and check the overall condition for any
possible damage or any other problems. Remove
the capping from each end of the meter openings.
Lightly blow some air into the inlet of the meter.
This should cause the impellers to rotate freely and
eventually come to a gradual stop.
Should the impellers stop suddenly or not rotate
after blowing into the meter, it will be necessary to
carefully remove any obstruction before
installation. If this is not possible, the meter should
be returned to the service shop for further
examination.
➢ Ensure that the meter is mounted in the correct gas
flow arrow direction and position. Meters are
normally installed using the following hardware
items listed in Table 1. The use of incorrect
hardware may result in meter error or failure. All
bolts should be tighten in a X pattern, in stages, up
to a typical torque value of 80 ft·lbs (110 N·m).
Some Romet meters are supplied with nippled
connections at the inlet and outlet. These meters
are built and tested with the connecting nipples in
place. Care must be taken to avoid further
tightening or loosening of these nipples to prevent
meter damage. Install auxiliary instrumentation as
required.
➢ After the meter has been properly installed,
approved meter oil must be added to all
appropriate oil reservoirs to prevent possible meter
errors or damage. Depending on the meter type
and mounting position (vertical or horizontal), the
required oil volumes will be different. DO NOT over
or under fill oil reservoirs. For the thrust cover end
and the magnetic housing (not found on all meter
types), oil must be added so that the oil reaches the
centre point of the correct oil level gauge (OLG) in
use. For the module cover, the oil must reach the
appropriate RED oil level line (note - centre point of
the OLG for standard counter modules).
DO NOT fill electronic sections with oil.
Note: After meter start up, some oil levels may drop
a little and/or form a thin bubble or meniscus layer
due to oil splash happening within the oil reservoir.
- Refer to “Oil Loss Bulletin”, Rev. OL-0111.
Approved meter oil: High VI R&O AW ISO VG 15
red, is available from Romet in one quart (litre)
plastic bottles. Other approved oil: Shell Morlina S2
BL 10. Use only one type of oil (never mix different
oils together). The addition of oil additives will
change oil properties which may cause the meter to
read incorrectly or result in complete meter failure.
➢ Ensure all oil plugs (and any other connections) are
properly tightened and secured before pressurizing
the meter set.
➢ When the meter installation has been completed,
the meter set should be pressurized SLOWLY
(maximum 5 psig or 35 kPa per second) up to the
allowable operating pressure specified to avoid
internal over-speed or slamming of the meter.
Should the installation be subject to sudden
“INSTANT ON-OFF” loads, a properly sized
restricting orifice or venturi flow nozzle should be
installed downstream of the meter to protect the
meter from damage.
➢ Check for any gas leaks or other possible problems.
➢ After start up, the readout counter or drive should
be running smoothly and in the correct direction
when the required gas flow condition has been
reached.
➢ Note: For further information, refer to Romet
“Installation & Maintenance” RM or G series
booklets. Since this publication is a general
guide, always refer to your company’s standard
practices for other details. This Bulletin is based on
actual field problems encountered and gas industry
standards.
Warning: Tampering or modifying design of
product may cause a potentially
hazardous situation.
TABLE 1 HARDWARE SPECIFICATION TABLE
METER MODEL
FLANGE/GASKETS
(FULL FACE)
BOLTS
(STEEL, ZINC PLATED)
RM600-RM1500
RM16-RM40
G10-G25
ANSI class 125/150 2”
⅝” – 11 x 1.5” long Hex Head
SAE Grade 5
RM2000-RM3000
RM55-RM85
G40-G65
ANSI class 125/150 2”
⅝” – 11 x 1.75” long Hex Head
SAE Grade 5
RM5000-RM7000
RM140-RM200
G100-G160
ANSI class125/150 3”
⅝” – 11 x 2” long Hex Head
SAE Grade 5
RM11000-RM23000
RM300-RM650
G160, G250, G400
ANSI class 125/150 4”
⅝” – 11 x 2” long Hex Head
SAE Grade 5
RM25000-RM56000
RM700-RM1600
G400-150, G650, G1000
ANSI class 125/150 6”
¾ “ – 10 x 2.5” long Hex Head
SAE Grade 5
RM38000-RM56000
RM1100-RM1600
G650-G1000
ANSI class 125/150 8”
¾ “ – 10 x 2.5” long Hex Head
SAE Grade 5
G10 – G25
PN16 40mm
M16 x 35mm long Hex Head
DIN 931 Grade 8.8
G40
PN16 40/50 mm
M16 x 45mm long Hex Head
DIN 931 Grade 8.8
G65
PN16 50mm
M16 x 45mm long Hex Head
DIN 931 Grade 8.8
G100
PN16 80mm
M16 x 50mm long Hex Head
DIN 931 Grade 8.8
G160
PN16 80/100 mm
M16 x 50mm long Hex Head
DIN 931 Grade 8.8
G250 - G400
PN16 100 mm
M16 x 50mm long Hex Head
DIN 931 Grade 8.8
G400/150-G1000
PN16 150 mm
M20 x 60mm long Hex Head
DIN 931 Grade 8.8
G650-G1000
PN16 200 mm
M20 x 60mm long Hex Head
DIN 931 Grade 8.8
❖ All bolts should be installed with approved anti-seize grease and standard steel zinc plated flat washers.
DO NOT FILL ELECTRONIC
SECTIONS WITH OIL
VERTICAL
METER MOUNT
41328657
321 76 854
HORIZONTAL
METER MOUNT
OIL LEVEL
(RED LINE)
76
5
21
3
4
OLG
FOR STD ID
MODULES ONLY
8
MODULE COVER
MAGNETIC HOUSING
ROMET Ltd.
431 2586 7
BACKUP COUNTER
THRUST COVER +
THRUST COVER
OLG
(OIL LEVEL GAUGE)
OLG (HORIZONTAL)
OLG (VERTICAL)
OIL LEVEL
(CENTRE POINT)
ARROW
GAS FLOW
METER BODY
401206
ROMET
3000
1 2
READOUT X 0.22222
=CU.FT.
REFERENCE ONLY
NON COMP. VOLUME
3 4 5 6 78
BACKUP
COUNTER
MADE IN CANADA
ROMET LTD. MISSISSAUGA ONT.
MAX. OP. PRES.
R
Y
SERIAL NO.
T
A
MODEL NO.
O
R
CAP.
P.S.I.
F
L
O
W
RM 3000
T
E
M
E
T.C.
C.F.H.
T.C.
R
GROUND SURFACE
ROMET LTD.
231
R O M E T
8
R O M E T
7645 8
R O M E T
5
4 67812
ROMET LTD.
3
GROUND SURFACE
INCORRECT MOUNTING
FLOW
FROM BOTTOM
TO TOP
5324 67
ROMET LTD.
1
R O M E T
53 4 67812
ROMET LTD.
OR
FLOW
FROM RIGHT
TO LEFT
FLOW
FROM LEFT
TO RIGHT
FLOW
FROM TOP
TO BOTTOM
GROUND SURFACE
REVERSED FLOW
VERTICAL
MOUNTING
R O M E T
8764213
5
ROMET LTD.
HORIZONTAL
MOUNTING
OR
STANDARD FLOW
MECHANICAL METER
MOUNTING POSITIONS
VERTICAL
MOUNTING
HORIZONTAL
MOUNTING
1080 Matheson Blvd. East, Mississauga, ON L4W 2V2 Canada
Phone 905-624-1591 Fax 905-624-5668 USA 1-800-387-3201
www.rometlimited.com romet@rometlimited.com
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