Flow meter implementation standard

JB／T 9248—1999

Flow meter nominal diameter

15、20、25、32、40、50、65、80、100、125、150、200、250、300、350、400、450、500、600、700、800、900、1000、1200、1400、1600、1800、2000、2200、2400、2600、2800、3000

Flow meter flow rate

15m／s

Accuracy

DNl5～DN600

Indication: ±0.3% (flow velocity ≥ 1m/s); ±3mm/s (flow velocity < 1m/s)

DN700—DN3000

±0.5% of indicated value (flow velocity ≥ 0.8m/S); ±4mm/s (flow velocity < 0.8m/S)

Fluid conductivity

≥5uS／cm

Nominal pressure

4.0MPa

1.6 MPa

1.0MPa

0.6 MPa

6.3、10MPa

DNl5～DN150

DNl5～DN600

DN200～DN1000

DN700～DN3000

Special Order

Ambient temperature

sensor

-25℃ - +60℃

Converter and integrated type

-10℃ - +60℃

Lining material

Polytetrafluoroethylene, polychloroprene rubber, polyurethane, polytetrafluoroethylene propylene (F46)

Fluid temperature

—Body type

70℃

Separate type

Neoprene lining

80℃; 120℃ (please specify when ordering)

Polyurethane lining

80℃

PTFE lining

100℃; 150℃ (please specify when ordering)

Fluorinated ethylene propylene (F46)

Screening PFA

Signal electrode and ground electrode materials

Stainless steel 0Crl8Nil2M02Ti, Hastelloy C, Hastelloy B, titanium, tantalum, platinum/iridium alloy, stainless steel coated with tungsten carbide

Electrode scraper mechanism

DN300—DN3000

Connection flange material

Carbon Steel

Grounding flange material

Stainless steel 1Crl8Ni9Ti

Imported protective flange material

DN65—DNl50

Stainless steel 1Crl8Ni9Ti

DN200～DNl600

Carbon steel + stainless steel 1Crl8Ni9Ti

Sewage flow meter housing protection

DNl5～DN3000 Separate rubber or polyurethane lined sensor

IP65 or IP68

Other sensors, - body flow meters and separate converters

IP65

Spacing (separated type)

The distance between the converter and the sensor is usually no more than 100m

Sewage flow meter lining material

Main performance

Medium temperature

Scope of application

—Body type

Separate type

Polytetrafluoroethylene (F4)

It is a plastic with stable chemical properties. It can withstand boiling hydrochloric acid, sulfuric acid, concentrated alkali and various organic solvents.

70℃

100℃ 150℃ (special order required)

1. Strongly corrosive media such as concentrated acid and alkali. 2. Sanitary media.

Fluorinated ethylene propylene (F46)

Same as F4, but with higher wear resistance and negative pressure resistance than F4.

Same as above

Polyvinyl fluoride (Fs)

The upper limit of applicable temperature is lower than that of polytetrafluoroethylene, but the cost is also lower.

80℃

Neoprene

1. Excellent elasticity, high tearing force, good wear resistance. 2. Resistant to corrosion by general low-concentration acid, alkali, and salt media, but not resistant to corrosion by oxidizing media.

80℃ 120℃ (special order required)

Water, sewage, slightly abrasive mud and slurry.

Polyurethane rubber

1. Excellent wear resistance.

2. Poor corrosion resistance.

80℃

Neutral and highly abrasive ore slurry, coal slurry, mud

Orchid species

Scope of application

Grounding flange (or grounding ring)

Suitable for non-conductive pipes such as plastic pipes, but not required for sensors with ground electrodes.

Imported protective flange

It is used when the medium is highly abrasive.

Electrode Materials

Corrosion and wear resistance

Stainless steel 0Crl8Nil2M02Ti

Used for weakly corrosive media such as industrial water, domestic water, sewage, etc., suitable for industrial sectors such as petroleum, chemical industry, steel, as well as municipal administration, environmental protection and other fields.

Hastelloy B

It has good corrosion resistance to hydrochloric acid of all concentrations below the boiling point, and is also resistant to corrosion by non-chlorinated acids, alkalis, and non-oxidizing salt solutions such as sulfuric acid, phosphoric acid, and organic acids.

Hastelloy C

It can resist corrosion from non-oxidizing acids such as nitric acid, mixed acid, or mixed medium of chromic acid and sulfuric acid, as well as corrosion from oxidizing salts such as Fe, Zn, Cu, or other oxidants such as hypochlorite solution above room temperature and seawater.

titanium

It is resistant to corrosion from seawater, various chlorides and hypochlorites, oxidizing acids (including fuming sulfuric acid), organic acids, and alkalis. It is not resistant to corrosion from purer reducing acids (such as sulfuric acid and hydrochloric acid), but if the acid contains oxidants (such as nitric acid, Fc++, Cu++), the corrosion is greatly reduced.

Tantalum

It has excellent corrosion resistance and is very similar to glass. It can resist corrosion from almost all chemical media (including boiling hydrochloric acid, nitric acid and sulfuric acid below 150°C) except fuming sulfuric acid and alkali. It is corrosion-resistant in alkali.

Platinum/Titanium Alloy

It is resistant to almost all chemical media, but is not suitable for aqua regia and ammonium salts.

Stainless steel coated with tungsten carbide

Used for non-corrosive and highly abrasive media.

Note: Due to the wide variety of media, their corrosiveness is affected by complex factors such as temperature, concentration, flow rate, etc., so this table is for reference only. Users should make their own choices based on actual conditions, and if necessary, corrosion resistance tests should be conducted on the selected materials, such as hanging plate tests.