NIH chemical
Chemical process pump, NIH single-stage single-suction chemical process pump
NIH chemical: chemical process pump from the CNP range. 59 models, flow 6 to 1,000 m³/h, head up to 125 m, motors 0.75 to 280 kW. Typical duties: caustic soda and chlor-alkali, non-ferrous metallurgy, petrochemicals, acids, pharmaceuticals, synthetic fibres and plastics, fertilizer, environmental protection, papermaking, steel pickling and plating. Open a model for its rated duty, dimensions and datasheet, or send us your duty and we will confirm the selection.
- Horizontal single-stage single-suction cantilever pump; CFD-optimised hydraulics, efficiency more than 5 % above IH pumps
- Bracket-supported suspension body relieves pipe loads
- Thin-oil lubricated bearings with a bearing separator, service life up to 25,000 h
- Seal chamber to API 682 with several flushing plan options; resists solids and crystallising media
- Shaft protected from the liquid by a sleeve; angular-contact ball bearings take impeller thrust
CNP-S-000016- Flow
- 6–1000 m³/h
- Head
- up to 125 m
- Power
- 0.75–280 kW
- Mains
- 50 Hz
- Models
- 59
- Liquid temp.
- -20 to +180 °C
Sizes
The 59 models of the NIH chemical range grouped by type. Open the Models tab for every model with its performance data.
| Type | Flow range | Head | Power | Outlet | Models |
|---|---|---|---|---|---|
| NIH40 | 6 m³/h | 20–50 m | 1.1–4 kW | — | 3 |
| NIH50 | 6.3–12.5 m³/h | 12.5–80 m | 0.75–11 kW | — | 6 |
| NIH65 | 12.5–25 m³/h | 12.5–125 m | 1.1–30 kW | — | 8 |
| NIH80 | 25–50 m³/h | 12.5–125 m | 2.2–37 kW | — | 8 |
| NIH100 | 50–100 m³/h | 12.5–125 m | 3–75 kW | — | 9 |
| NIH125 | 75–200 m³/h | 12.5–125 m | 5.5–110 kW | — | 13 |
| NIH150 | 200 m³/h | 20–50 m | 18.5–45 kW | — | 3 |
| NIH200 | 400 m³/h | 20–80 m | 30–132 kW | — | 4 |
| NIH250 | 640–660 m³/h | 32–75 m | 90–200 kW | — | 3 |
| NIH300 | 1000 m³/h | 50–75 m | 200–280 kW | — | 2 |
Models
Filter by duty point, mains frequency or size. Click a model for its performance curve and data.
Performance range
Every model of the NIH chemical range on one chart: each dot is the rated duty point of one model. Click a line or dot to open that model with its full data.
- NIH40
- NIH50
- NIH65
- NIH80
- NIH100
- NIH125
- NIH150
- NIH200
- NIH250
- NIH300
Logarithmic scales. Published catalogue data for clean water; the correct model for your duty is confirmed by our engineers.
Spare parts for NIH chemical
Typical wear and service parts for this type of pump. The exact part, material and part number depend on the model, so send us the model code (or a nameplate photo) and we confirm and quote the right one.
| Part | What it does | |
|---|---|---|
| Mechanical seal | Seals the shaft; choose the face and elastomer materials for the liquid | |
| Impeller | Transfers energy to the liquid; wears with solids and corrosion | |
| Gaskets and O-rings | Seal the casing joints in a material that suits the chemical | |
| Shaft sleeve | Protects the shaft in the seal area | |
| Bearings | Carry the shaft; replace on noise or heat | |
| Coupling | Connects motor and pump; check the rubber element |
Generic list for this pump type; it is not a part-number catalogue for the series. Our team confirms the correct part for your model before quoting.
Specification & options
Key parameters
- StandardsISO 2858, API 610, API 682
- Cover figuresFlow 3–120 m³/h, head 5–150 m (table rates up to 1200 m³/h)
- Fluid temperature-20 to +180 °C
- Max working pressure2.0 MPa
- FlangesHG/T 20592-2009 PN16 RF (other standards on request)
- Speeds2900 rpm (2-pole) and 1450 rpm (4-pole)
- RotationClockwise seen from the drive end
Materials by industry
| Industry | Medium | Common metal materials |
|---|---|---|
| Caustic soda / chlor-alkali | Sodium hydroxide, sodium hypochlorite, sodium chlorite, light brine, cathode and anodic fluid | 304, 316L, TA2/TA9/TA10, Ni200 |
| Acid production | Sulfuric, phosphoric, nitric, acetic acid | 304, 316L, 2205, 904, 20# alloy, Hastelloy |
| Salt production | Sodium chloride, sulfate, nitrate | 304, 316L, 2205, 2507, TA2 |
| Pharmacy | Ethanol, glucose, medicine, pesticide | 304, 316L |
| Fine chemistry | Organic chemicals and intermediates, synthetic fibres and resins, monomers | 304, 316L, 2205, 2507, TA2 |
| Fertilizer | Urea, amine and potash fertilizer | 304, 316L |
| Papermaking | Pulp, black liquor, white and green mud, filtrate | 304, 2205, 0Cr17, CD4MCu |
| Food | Filter aids, additives | 304, 316L |
| Sewage treatment | Sodium hypochlorite, sodium sulfite, sodium dihydrogen phosphate | 304, 316L, 2205, 2507, TA2 |
| Desalination | Seawater | 316L, 2205, 2507, TA2 |
Choose corrosion- and wear-resistant materials to suit the medium; no per-part material list is printed.
Common API seal flushing plans
| Plan | Description | Use |
|---|---|---|
| Plan 11 | Recirculation from the pump discharge through an orifice into the seal chamber; default plan for single seals | Clean fluids at moderate temperature, non-polymerising |
| Plan 21 | As plan 11 with a cooler in the recirculation line | Hot clean fluids, e.g. hot water below 177 °C |
| Plan 23 | Seal chamber recirculation through a heat exchanger and back; standard for hot water | Hot clean services, boiler feed water, hot hydrocarbons |
| Plan 31 | Discharge recirculation through a cyclone separator; clean fluid to the seal, solids to suction | Media with suspended solids |
| Plan 52 | Unpressurised buffer fluid in a tank, circulated by a pumping ring (tandem seals) | No leakage to atmosphere tolerated: hazardous, toxic, flammable media |
| Plan 53A | Pressurised barrier fluid in a tank, circulated by a pumping ring (dual seals) | No-leakage duties: hazardous, toxic, flammable media; high vapour pressure liquids |
| Plan 53B | Pressurised barrier fluid circuit held at pressure by a bladder accumulator | No-leakage duties; dirty, abrasive or polymerising products |
| Plan 54 | Pressurised barrier fluid circulated from an external system | Dual seals in series; dirty, abrasive or polymerising products; high vapour pressure liquids |
More features
- Rear pull-out design: service without disturbing the pipes
- Interchangeable spare parts
Technical data
Liquid temperature
- -20 to +180 °C
Typical applications
- Caustic soda and chlor-alkali, non-ferrous metallurgy, petrochemicals, acids, pharmaceuticals, synthetic fibres and plastics, fertilizer, environmental protection, papermaking, steel pickling and plating
Data basis
- CNP NIH catalogue E220301, pp. 3–8
Performance values are taken from the published CNP catalogue data. Our engineers confirm the final selection for your liquid, temperature, supply and site before quoting.
