General
The DICKOW-Inline-Pumps, series NCV / NCVL, have been developed for the chemical, petrochemical and related industries.
Since the pumps are installed inline, only a minimum of space is required and therefore, these pumps are suitable for package units. No time-consuming alignment of couplings is required. Ball bearing failures through inadequate alignment are excluded.
With a wide selection of materials and shaft sealing systems, the NCV-pumps are sutiable for handling nearly all kinds of liquids used in the above mentioned industries.
For example: acyds, lyes, hydrocarbons, hot water up to 234°C (455°F), hot oil up to 350°F (660°F), cooling fluids, solvents etc.
Construction
The DICKOW-Inline-pumps are single stage, single-flow volute casing pumps in vertical construction with inline flange arrangement. The drive motor is connected with the pump casing by a motor support lantern.
Two different designs are available.
• Type NCV
The pump shaft is connected with the motor shaft by a clamping device and secured by a key.
• Type NCVL
The pump shaft is beared by the bearing bracket of a standard horizontal pump. Power is transmitted from motor shaft to pump shaft by a spacer coupling. After removal of the spacer, the bearing bracket including shaft seal and impeller can be removed without demounting the motor.
Drive motors
All standard flange mounted motors can be applied without any modification. No special shaft designs are required.
Pump shaft, bearings
The connections "shaft nut - impeller hub" and "impeller hub - shaft sleeve" are sealed by confined gaskets, preventing contact of pumped liquid with the pump shaft.
The NCV-type has the pump shaft rigidly clamped to the motor shaft and therefore, guided in the motor bearings.
The NCVL-type has the pump shaft carried in grease lubricated ball/roller bearings which are held by the bearing bracket. Regreasing device is avialable.
Impeller
To minimize thrust load, the impeller is fitted with wear rings and balancing holes in the hub. The impeller is keyed to the pump shaft and secured by shaft nuts with Heli-Coli insert. Impellers are properly statically balanced according to API 610 and VDI-Standard 2060, class 2.5-6.3. This grants smooth vibration free running.
Intermediate casing
The intermedia casing seperates the pumped liquid from the atmosphere by the sealing system
Materials
Materials for standard design are stated below. Special materials on request.
| Pump type | NCV(L) s | NCV(L) hu | NCV(L) h |
| Volute casing | GGG40.3 | GS-C25 | 1.4408 |
| Impeller | GG25 | GG25 | 1.4408 |
| Intermediate casing | St37 | St37 | 1.4571 |
| Pump shaft | 1.4021 | 1.4021 | 1.4021 *) |
| Motor support lantern | GG25/St | GG25/St | GG25/St |
| Shaft sleeve | 1.4571 | 1.4571 | 1.4571 |
*) 1.4571 if DICKOW-Metal bellows mechanical seals are applied
| Ductile iron | GGG40.3 | a | A 395 | 1.4408 (G-X5 CrNiMo 18.10) | a | A 296 CF8M | |
| Cast iron | GG25 | a | A 48 No 30 | 1.4571 (X10 CrNiMoTi 18.10) | a | AISI 316L | |
| Cast steel | GS-C25 | a | A 216-WCB | 1.4057 (X22 CrNi 17) | a | A 431 | |
| Carbon steel | St37 | a | A 53 Gr.A. | 1.4021 (X20 Cr 13) | a | AISI 420 |
Shaft sealing systems
The seal chambers of the NCV / NCVL-pumps are designed to hold all common mechanical seals:
|
Metal bellows seal, Tandem-arrangement, System DICKOW, Thermal oil design, max. 350°C (660°F) |
Balanced mechanical seal with pump ring, acc. to DIN 24960, Hot water design, with aircooled heat exchanger |
|
Metal bellows seal, System DICKOW, with auxiliary stuffing box |
Metall bellows mechanical seal, System DICKOW, rotating bellows |
|
Tandem metal bellows seal, acc. to DIN 24960, with barrier fluid |
Balanced hot water mechanical seal, acc. to DIN 24960, with cooled seat |
