Dwyer Instruments SSM Series Installation And Operating Instructions Manual

Series SSM 316 & SSB All Metal Flowmeters are ideal for dirty or
opaque fluids, high temperature and high pressure service and harsh
environments. The direct reading scale provides ±2% accuracy.
Flowmeters can quickly be disassembled without removing the body from
the pipeline for easy cleaning.
SAFETY PRECAUTIONS
Personnel safety should be considered before pressurizing and operating
the system. There are numerous possibilities for error in system operation
and maintenance as well as component installation. Because human eyes
must necessarily come into close proximity with the flowmeter to read it,
Dwyer Instruments, Inc. recommends that safety shielding such as a sheet
of transparent, high impact material be used in front of the meter. If
hazardous, toxic, or flammable fluids are being metered, recommended
safeguard should include methods to protect personnel from splash or
rebound. A method of quick, safe removal of dangerous fluids should also
be included.
INSTALLATION
PREPARATION: Series SSM & SSB All Metal Flowmeters are ready to
install as-is, although the sight tube may need repositioning so the scale is
visible after installation. First, remove the protective caps from the
connection ports. ALSO, REMOVE THE PLASTIC TUBING ABOVE THE
INLET CAP IN THE METER CORE TUBE! This tubing blocks the float
assembly in place during shipment. Check that the float moves freely within
the core tube, and that no packing materials are in the meter.
RECOMMENDED PIPING
Series SSM & SSB All Metal Flowmeters generally have no special straight
run or other piping requirements. Inlet piping should be the same size as
the meter connection. Some effect on meter accuracy may occur at high
flow velocities if inlet piping guidelines are violated. Please refer to the table
on the next page. When installing on different size pipe, use standard pipe
adapters and come into the meter inlet with a nipple 8 diameters long of
the same size for greatest accuracy. Control valves should be mounted on
the outlet side of the meter. The use of a three valve manifold around the
meter is suggested, as it allows uninterrupted process flow while the meter
is being cleaned.
PLUMBING-IN
While the flowmeters should be vertical, exact plumbness is not necessary.
A general rule is that if the meter appears plumb, it is close enough (even
if off by 10º, the predictable reading error is usually less than 1%). Pipe
should be cut to proper lengths to avoid stress on the meter. Avoid over-
tightening, and do no use wrenches on the body or sight tube. If using
DWYER INSTRUMENTS, INC.
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46361, U.S.A.
Series SSM & SSB All Metal Flowmeters
Specifications - Installation and Operating Instructions
10.780
[273]
4.026
[102]
MODEL SSM110,111,112
Phone: 219/879-8000
Fax: 219/872-9057
15.640
[397]
2.810
3/4" NPT
[71.4]
Ø 1.350 [34.3]
Ø 2.754
2.680
[70]
[68]
SPECIFICATIONS
Service: Compatible liquids.
Wetted Material: T316 SS, Alnico magnet, FKM O-ring.
Temperature Limits: 300ºF (149ºC), temperatures from 300˚F to 600°F
(149˚C to 316°C) require "hot top" sold separately.
Pressure Limits: 3/4" models: 1000 psig (68.9 bar) @ 250ºF (121ºC),
1-1/2"models: 800 psig (55 bar) @250ºF (121ºC).
(See the chart on pg. 6 for temperature vs.. pressure ratings.)
Accuracy: ±2% full scale.
Repeatability: ±0.5% of indicated flow rate.
Process Connections: 3/4" or 1-1/2" female NPT.
Scale Length: 3/4" models: 3.2" (8 cm); 1-1/2" models: 5.2" (13 cm).
Weight: 3/4" models: 5 lb (2.3 kg); 1-1/2" models: 13 lb (5.9 kg).
solvents in the vicinity of polysulfone sight tubes, the tube should be
removed until fumes clear.
SURGE & WATER HAMMER PREVENTION
Operating Limits are for non-shock conditions only. Flowmeters are more
accurate and less likely to be damaged when the fluid flow is smooth.
Water hammer is a hazardous phenomenon and should be eliminated from
any fluid system. Water hammer is a series of pressure shocks create by a
sudden change in the flow velocity of liquid in a pipe. This sudden change,
often caused by a fast acting valve or starting, stopping, or change in
speed of a pump, generates an immediate rise in pressure that sometimes
makes a noise similar to striking the pipe with a hammer. The pressure
wave is transmitted from the source throughout the system, subjecting
every component to the sudden shock. Pressure returns to normal only
when a larger vessel or pipe section is reached, the energy dissipated thru
friction and pipe expansion, or some component ruptures. Rupture of
piping, valves, flowmeters, or other components have obvious safety
ramifications that must be addressed.
Surge Chambers & Accumulators: Flowmeters are more accurate and less
likely to be damaged when the fluid flow is smooth. If the meter must be
installed on a line where reciprocating pumps causing pulsation are used,
surge chambers, accumulators, or desurgers are strongly suggested to
dampen the shock wave. This is a good, general practice for all
flowmeters.
SIGHT TUBE ROTATION: Series SSM & SSB All Metal Flowmeters use
magnetically-linked ball indicators and the scale usually may be positioned
over approximately a 300˚ range. However, the magnet position must also
be changed accordingly, requiring removal of the sight tube (see
"Disassembly"). On standard SSM & SSB All Metal Flowmeters as
www.dwyer-inst.com
e-mail: info@dwyer-inst.com
Bulletin F-41-B
4.503
1-1/2" NPT
[114]
Ø 2.480
[63]
Ø 4.010
5.695
3.710
[101.8]
[145]
[94]
MODEL SSM113,115