INSTALLATION & MAINTENANCE BULLETIN No.
601
October 3, 2013 Rev.12
Installation Instructions
for
Line Mounted ROMET Meters
RM600 – RM56000 RM16 – RM1600 G10 – G1000
This bulletin covers the general installation of all The use of a filter (e.g. Romet Screen “T” filter,
ROMET rotary meters. typically 80 mesh/178 micron size) or strainer
installed upstream of the meter set is strongly
A Romet meter is a precise gas volume measuring recommended to insure adequate internal meter
instrument (cash register), manufactured to very protection.
tight tolerances. Rough handling of the meter must
be avoided to prevent damage. Before installing a Romet meter, a quick check
should be performed.
To prevent external/internal damage, dirt or oil First, remove the meter from the protective
contamination of the meter, always transport the container and check the overall condition for any
meter in a protective container with the meter possible damage or any other problems. Remove
capped at both opening ends, including the the capping from each end of the meter openings.
instrument drive assembly (if applicable), and Lightly blow some air into the inlet of the meter.
WITHOUT oil. This should cause the impellers to rotate freely and
Always add oil after the meter has been correctly eventually come to a gradual stop.
installed at the meter site. Should the impellers stop suddenly or not rotate
after blowing into the meter, it will be necessary to
Installation of a Romet rotary meter is a relatively carefully remove any obstruction before
simple procedure if the meter set is properly installation. If this is not possible, the meter should
constructed. The piping and flange position of the be returned to the service shop for further
meter set should be such that there is adequate examination.
area spacing between the meter and any pipe, wall
or any other possible obstruction. This spacing will Ensure that the meter is mounted in the correct gas
allow for ease of maintenance or the addition or flow arrow direction and position. Meters are
removal of devices; such as, a meter module, normally installed using the following hardware
batteries or any other auxiliary instruments. items listed in Table 1. The use of incorrect
hardware may result in meter error or failure. All
Furthermore, all full faced pipe flanges installed bolts should be tighten in a X pattern, in stages, up
(raised flanges are not recommended) must be to a typical torque value of 20 ft lbs (27 Nm). Some
level and spaced so that the meter together with Romet meters are supplied with nippled
the top and bottom gaskets can be positioned connections at the inlet and outlet. These meters
between the flanges easily and with the least are built and tested with the connecting nipples in
amount of air gap (maximum 1/16“ (1.6 mm) per place. Care must be taken to avoid further
linear foot (30.5 cm) of flange) before tightening. If tightening or loosening of these nipples to prevent
the meter is not level, it is possible to improperly fill meter damage. Install auxiliary instrumentation as
the oil reservoirs or over-stress the meter after required.
tightening the flange bolts. This condition may
cause the meter to read incorrectly or result in After the meter has been properly installed,
complete meter failure. approved meter oil must be added to all
Care must also be taken to ensure that the piping appropriate oil reservoirs to prevent possible meter
and flanges are aligned correctly in relation to the errors or damage. Depending on the meter type
meter (maximum 1/16“ (1.6mm) in all directions). and mounting position (vertical or horizontal), the
DO NOT use the meter to correct misaligned piping required oil volumes will be different. DO NOT over
or flanges. Excessive misalignment or distance or under fill oil reservoirs. For the thrust cover end
between piping or flanges may over-stress the and the magnetic housing (not found on all meter
meter body when the flange bolts are tightened. types), oil must be added so that the oil reaches the
Severe over-stress may cause the meter to read centre point of the correct oil level gauge (OLG) in
incorrectly or result in complete meter failure. use. For the module cover, the oil must reach the
The use of a “spool piece” is recommended to help appropriate RED oil level line (note - centre point of
level and align piping and/or flanges in relation to the OLG for standard counter modules).
the meter before meter installation. These spools DO NOT fill electronic sections with oil.
are available from Romet. Note: After meter start up, some oil levels may drop
To protect the meter (and any other critical a little and/or form a thin bubble or meniscus layer
devices) from internal damage, the gas passing due to oil splash happening within the oil reservoir.
through a meter set must be clean (i.e. free of rust, - Refer to “Oil Loss Bulletin”, Rev. OL-0111.
scale, grease, pipe paste, wadding, weld beads,
etc.).
Approved meter oil is available from Romet in one installed downstream of the meter to protect the
quart (litre) plastic bottles. Other approved oil: Shell meter from damage.
Morlina 10 (previously known as Shell Tellus 10).
Use only one type of oil (never mix different oils Check for any gas leaks or other possible problems.
together). The addition of oil additives will change After start up, the readout counter or drive should
oil properties which may cause the meter to read be running smoothly and in the correct direction
incorrectly or result in complete meter failure. when the required gas flow condition has been
Ensure all oil plugs (and any other connections) are reached.
properly tightened and secured before pressurizing Note: For further information, refer to Romet
the meter set. “Installation & Maintenance” RM or G series
When the meter installation has been completed, booklets. Since this publication is a general
the meter set should be pressurized SLOWLY guide, always refer to your company’s standard
(maximum 5 psig or 35 kPa per second) up to the practices for other details. This Bulletin is based on
allowable operating pressure specified to avoid actual field problems encountered and gas industry
internal over-speed or slamming of the meter. standards.
Should the installation be subject to sudden Warning: Tampering or modifying design of
“INSTANT ON-OFF” loads, a properly sized product may cause a potentially
restricting orifice or venturi flow nozzle should be hazardous situation.
MODULE COVER MAGNETIC HOUSING METER BODY GAS FLOW THRUST COVER BACKUP
DO NOT FILL ELECTRONIC ARROW COUNTER
SECTIONS WITH OIL THRUST COVER +
BACKUP COUNTER
Y ME
TAR T.C. TER
RO T.C.
MODEL NO.
CAP. C.F.H. F
MAX. OP. PRES. P.S.I. L
O
SERIAL NO.
W
ROMET LTD. MISSISSAUGA ONT.
ROMET
401206
ROMET Ltd. MADE IN CANADA
1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8
3000
RM 3000
1 2 3 4 5 6 7 8
READOUT X 0.22222
=CU.FT.
REFERENCE ONLY
NON COMP. VOLUME
OLG
FOR STD ID OLG (VERTICAL)
MODULES ONLY OLG (HORIZONTAL)
1 2 3 45 67 8
1 2 3 4 5 6 7 8 OIL LEVEL
OIL LEVEL (CENTRE POINT)
(RED LINE)
VERTICAL HORIZONTAL OLG
METER MOUNT METER MOUNT (OIL LEVEL GAUGE)
MECHANICAL METER
TABLE 1 HARDWARE SPECIFICATION TABLE MOUNTING POSITIONS
FLANGE/GASKETS BOLTS STANDARD FLOW
METER MODEL VERTICAL HORIZONTAL
(FULL FACE) (STEEL, ZINC PLATED) MOUNTING MOUNTING
RM600-RM1500 ⅝” – 11 x 1.5” long Hex Head FLOW FLOW
ANSI class 125/150 2” FROM TOP FROM LEFT
RM16-RM40 SAE Grade 5 TO BOTTOM TO RIGHT
RM2000-RM3000 ⅝” – 11 x 1.75” long Hex Head
ANSI class 125/150 2”
RM55-RM85 SAE Grade 5
ROMET LTD.
1 2 3 4 5 6 7 8
R O M E T
RM5000-RM7000 ⅝” – 11 x 2” long Hex Head OR
ANSI class125/150 3”
RM140-RM200 SAE Grade 5 GROUND SURFACE
RM11000-RM23000 ⅝” – 11 x 2” long Hex Head
ANSI class 125/150 4” REVERSED FLOW
RM300-RM650 SAE Grade 5 VERTICAL HORIZONTAL
RM25000-RM56000 ¾ “ – 10 x 2.5” long Hex Head MOUNTING MOUNTING
ANSI class 125/150 6”
RM700-RM1600 SAE Grade 5 FLOW
FROM RIGHT
M16 x 35mm long Hex Head ROMET LTD.
R O M E T TO LEFT
G10 – G25 PN16 40mm
1 2 3 4 5 6 7 8
DIN 931 Grade 8.8
M16 x 45mm long Hex Head
G40 PN16 40/50 mm
FLOW
DIN 931 Grade 8.8
FROM BOTTOM
OR
TO TOP
M16 x 45mm long Hex Head GROUND SURFACE
G65 PN16 50mm
DIN 931 Grade 8.8 INCORRECT MOUNTING
M16 x 50mm long Hex Head
G100 PN16 80mm
DIN 931 Grade 8.8
1 2 3 4 5 6 7 8
ROMET LTD.
R OM E T
M16 x 50mm long Hex Head
G160 PN16 80/100 mm
DIN 931 Grade 8.8
R OM E T
R O M E T 1 2 3 4 5 6 7 8
ROMET LTD.
M16 x 50mm long Hex Head
G250 - G400 PN16 100 mm
DIN 931 Grade 8.8
1 2 3 4 5 6 7 8
ROMET LTD.
M20 x 60mm long Hex Head
G400/150-G1000 PN16 150 mm
DIN 931 Grade 8.8 GROUND SURFACE
All bolts should be installed with approved anti-seize grease and standard steel zinc plated flat washers.
