LEFM 3xxCi User Manual
IB1406 Rev 12
Section 2
Page 18
August 2017
380Ci Upstream Condition Requirements for Calibrated Meters (Pipe Sizes ≥ 6 in.)
To meet the requirements of the Measurement Instruments Directive (Directive 2004/22/EC) and OIML R-
137, one of the following installation configurations must be used:
Inlet piping configuration No. 1: 5D
o
Measuring installations using the LEFM 380Ci with 5 diameters or more of straight pipe upstream
(without a flow conditioner) and 3 diameters downstream are suitable for accuracy class 0.5 and
accuracy class 1.0 in piping arrangements that cause only mild disturbances excluding
expanders where the upstream pipe is smaller than the meter diameter. Examples of permitted
pipe arrangements upstream of the 5 diameters are bends, tees and reducers, including single
bends and out-of-plane combinations.
Inlet piping configuration No. 2: 10D
o
Measuring installations using the LEFM 380Ci with 10 diameters or more of straight pipe
upstream (without a flow conditioner) and 3 diameters downstream are suitable for accuracy
class 0.5 and accuracy class 1.0 in piping arrangements that cause only mild disturbances
including expanders where the upstream pipe is smaller than the meter diameter. Examples of
permitted pipe arrangements upstream of the 10 diameters are bends, tees, expanders, and
reducers, including single bends and out-of-plane combinations.
Inlet piping configuration No. 3: 15D
o
Measuring installations using the LEFM 380Ci with 15 diameters or more of straight pipe
upstream (without a flow conditioner) and 3 diameters downstream are suitable for accuracy
class 1.0 in piping arrangements that cause severe disturbances including combinations of out-
of-plane bends in combination with partial blockage of the pipe. An example of a severe
disturbance would be a 50% open gate valve installed between out-of-plane bends.
Inlet piping configuration No. 4: 15D (with flow conditioner)
o
Measuring installations using the LEFM 380Ci with 15 diameters or more of straight pipe
upstream inclusive of a flow conditioner with its inlet located 10 diameters from the meter, and
with 3 diameters downstream are suitable for accuracy class 0.5 and accuracy class 1.0 in piping
arrangements that cause severe disturbances including combinations of out-of-plane bends in
combination with partial blockage of the pipe. An example of a severe disturbance would be a
50% open gate valve installed between out-of-plane bends.
For all above configurations, the internal diameter of the pipe sections must be the same as the inlet and
outlet diameter of the meter. The pipe sections shall be considered identical if their diameters differ by no
more than 3%. For unidirectional flow, the temperature sensor well should be installed downstream of the
meter. The distance from the downstream flange face to the temperature sensor well should be between 2
and 5 internal diameters. For bi-directional flow installations, temperature sensor well should be located at
between 3 and 5 diameters from the flange of the meter.
340Ci Upstream Condition Requirements for Calibrated Meters (Pipe Sizes ≥ 6 in.)
To meet the requirements of the Measurement Instruments Directive (Directive 2004/22/EC) and OIML R-
137, one of the following installation configurations must be used:
