Characteristics; Packing; Storage; Handling - DRESSER Delta Serie Mode D'emploi

Keep this manual easily accessible for all users .
Ask for a written approval of the manufacturer for all cases not
planned in this instruction manual . Please respect all national
rules for installation, operation and service of gas meters .

1 Characteristics

Delta meters are designed to measure gases of the 1st, 2nd and
3rd gas families as specified in EN437 as well as various filtered
and non-corrosive gases (e . g . Oxygen) .

2 Packing

• The meter, depending on the size or version is delivered:
• In a cardboard box, protected by carton inserts or polyethyl-
ene wedges .
On a wood pallet, protected by a cardboard cover .
The packing shall contain the filling lubricant, plugs for the in-
stalled transmitters and this instruction manual .

2.1 Storage

If the meter is not going to be used immediately, it should be
stored under cover in a clean, dry environment, in the horizon-
tal position .
The caps fitted in the inlet and outlet pipe must stay in place
until installation .

2.2 Handling

The meter is delivered without lubricant in covers . Before ship-
ping or handling, ensure that the lubricant has been thorough-
ly drained from the front and the rear covers to prevent spillage
into the measuring chamber . Meters should be lifted only with
belt around the main body or with the eyelets .

3 Installation

3.1 General

Due to the volumetric principle of the Delta meter, its metrol-
ogy is not influenced by the installation conditions . Neverthe-
less the respect of the following rules will insure the best use of
your Delta meter:
Recommended installation: See Annex 1
• Check visually that the meter has not been damaged during
transport .
• No welding is allowed with meter installed .
• The meter should be installed with the impellers horizontal .
Allowed deviation: +/- 5° .
• Never install a meter at a low point in the piping where the
meter could be subject to the accumulation of water or par-
ticles .
• If Teflon tape is used to tight threaded joint then the best at-
tention must be taken to avoid introducing tape in the meas-
uring chamber .
• The meter should be installed without stress in the piping .
The flanges must be correctly lined up .
• The meter should be considered in a possible grounding
system
4
• On flanges with UNC screw-thread, the threads are NOT met-
ric but defined in inch following ANSI/ASME B1 . 1 – 1989 .
Metric threads and threads defined in inch are not com-
patible!
• Please tighten bolts in opposite pairs
• A flexible coupling can be used to ensure a stress-free instal-
lation .
• The use of a filter, placed upstream of the meter, is advisable
in gas with high particulate content . See § 3 . 2 .
Before installation:
• The piping upstream of the meter should be free of dust .
• Remove the protective caps .
• Ensure that the direction of gas flow corresponds with the
arrow situated on the meter body .
• Check that the impellers turn freely .
• Possible accessories to be assembled onto the meter must
not interfere its corrosion protection .

3.2 Filtration

Rotary meters work better if there are no particles within the
gas . It is advisable therefore to filter the gas upstream of the
meter . Recommended level of filtration is 100 μm or better .
While the meter is in service, periodically check the cleanliness
of the filter, especially in the case of a new installation or after
work has been performed on the upstream piping .
For installation with flow direction from bottom to top a par-
ticular attention has to be taken to the filtering conditions to
avoid that accumulation of dust downstream of the meter may
come back into the meter . For example a second filter can be
installed downstream of the meter .

3.3 Lubrication

3.3.1 General
Choose the lubricant according to the operating conditions .
This lubricant should be neutral and non detergent . Important:
• A lack of lubricant could cause premature wear of the meter .
• An excess of lubricant can also induce problems . A surplus
of lubricant can contaminate the measuring chamber, may
degrade the metrology and cause damage to the bearings
and the impellers due to the mixture of lubricant and small
impurities contained in the gas .
• Always drain the end-covers before moving the meter .

3.3.2 Choice of lubricant

Viscosity: The viscosity has been calculated to ensure mechani-
cal and metrological performance of the meter .
Commercial references: Annex 2 contains a list of commercial
lubricants usable for industrial gas except gases such oxygen
and halogens . For other gases, please consult us .

3.3.3 Filling and draining procedure

See Annex 4 for the location of fill, drain plug and sights .
Filling and draining operations should be carried out with the
meter installed in the piping, but not pressurised, though the
use of Pete's Plugs may allow lubricant levels to be "topped up"
while the meter is pressurised (up to 20 bar) . See Annex 7 .