LANZHOU PETROLEUM & CHEMICAL MACHINERY
WORKS 3NB1300C Introduction
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1. Technical specifications
Type
Parameter
|
3NB1300C
|
Input power rating (KW)
|
956 (1300HP)
|
Rated pump speed (SPM)
|
120
|
Stroke (mm)
|
305
|
Gear ratio
|
3.81
|
Rated speed of transmission shaft (RPM)
|
457
|
Max. working pressure (MPa)
|
34.3 (5000PSI)
|
Valve size (API)
|
7#
|
Max. liner diameter (mm)
|
φ190
|
Max. displacement (l/s)
|
46.6
|
Max. liner pressure (MPa)
|
18.4 (2500PSI)
|
Diameter of suction pipe (mm)
|
305 (12”)
|
Diameter of discharge pipe (mm)
|
100 (4”)
|
Overall dimensions
|
5010x1942x1918mm
|
Weight （ton）
|
23
|
2. Design features
2.1 The power end
2.1.1
The pump frame is of welded steel – plate construction. The bearing
housings of the crankshaft and the transmission shaft are made of steel
castings and are welded to the frame after rough – machined. They are stress –
relieved after welded.
2.1.2
The crankshaft is a hollow steel casting.
2.1.3
The herringbone gear ring and pinion are composed of helical gears in
pairs
respectively.
2.1.4
The crosshead is a one – piece casting and runs directly in the guides.
2.1.5
All the bearings, crossheads and guides are splash – lubricated. At
suitable locations there are oil wipers and troughs provided to ensure a well –
distributed lubrication.
2.1.6
The transmission shaft is equipped with single – row radial short –
roller bearings.
2.1.7
The main bearings are double – row radial spherical – roller bearings.
2.1.8
The crosshead is equipped with long – roller bearings.
2.1.9
The big end of the connecting rod runs in radial roller bearing.
2.2 The fluid end
2.2.1
The fluid end is composed of three fluid modules (cylinders), each of
which is a
sectional and communicating construction.
The suction and discharge are
accomplished by suction and discharge
pipes. The suction and discharge valves are
vertically aligned with each other to
minimize the volumetric clearance.
2.2.2
There is clamp connection between the piston rod and the intermediate
rod, which facilitates the services of these parts.
2.2.3
The piston liner is attached to the liner seat with a buttress –
threaded retainer.
2.2.4
The threaded cover of the valve box is attached to the threaded ring
with buttress threads, which facilitates the services of them. The threaded
ring is fastened to the fluid module with studs, which facilitates the
machining and servicing of the fluid
module.
2.2.5
The taper of the valve seat is 1:6. The bottom of the seat is provided
with a shoulder to be suitable for high operating pressure
2.2.6
The piston rod conforms to SY5138-86. The piston is fastened with M39x3
locknut and is lubricated and cooled by the water or the water with inhibitor
supplied by a centrifugal spray pump.
2.2.7
There are six sizes of liners with an increment of 10mm in I.D. All
these liners are the same in O.D.
2.2.8
There are two types of liners: high-grade liner and plain liner. The
high – grade liner is made of carbon steel as a base metal which is casted or
inserted with high – chrome alloy – steel to ensure wearability. The plain
liner is made of low – carbon steel which is carburized and quenched inside to
enhance the surface hardness.
2.2.9
There are suction inlets in front of and on both sides of the pump,
which are connected to the suction manifold. The three suction flanges are of
12”ASAB16.5-150PSI or 10”ASAB16.5-150PSI.
2.2.10 The flanges of discharge pipe and
five-way joint are of 4”API-5000PSI6B. The seal rings here are API’s R39.
2.2.11
The discharge pulsation dampener is spherical and pre – pressured. Its
Max. working pressure is 350kg/cm2, and volume is 75 litres (20 gallons). The
pulsation dampener is connected to the air filler and to the pressure gauge,
using 3/4” – 14NPT and 1/4” – 18NPT respectively.
2.2.12 The suction pulsation dampener is of
rubber – hose type and pre – pressured and connected with the flanges of the
12” and 10”ASAB16.5-150PSI.
2.2.13 It is advisable to equip a charging
pump during operation to improve the suction performance and raise the
efficiency of the slush pump.
2.2.14
It is advisable to equip a spray pump during operation to cool the
pistons and liners so as to extend their service life.
2.3 Accessories
Complete set of special tools for major
locations of the pump will be provided along with the slush pump to facilitate
the services and replacement of expendable parts.
3. Installation
Prior to installation, a proper layout plan
shall be prepared to indicate the position of the slush pump, charging pump and
spray pump as well as the disposition of the suction and discharge manifolds.
The slush pump shall be provided with a
centrifugal charging pump to enhance the pump efficiency. There shall be a
metallic slush sump above the ground, and the suction manifold shall be as
short as possible to improve the suction condition.
3.1 Foundation
The slush pump shall be set on a level
concrete foundation and the same oil level shall be kept in the left and right
oil troughs of the power end so as to assure satisfactory
distribution of oil to all parts to be
lubricated. Especially in drilling vessels, the slush pump shall be properly
leveled over the whole length. With the slush pump leveled, all the anchor
bolts shall be tightened uniformly around the main base to secure the pump base
against deformation, especially in case of belt or chain transmission, and some
plates or bars may be used to fix the pump and prevent the pump from
displacement.
3.2 Transmissions
A belt or chain transmission can be used
for the slush pump. According to the actual
conditions the driven sheave or sprocket
can be located on the left or right side, and the sheave to drive the spray and
charging pumps will be mounted on the other side. The rotation direction of
running centrifugal spray pump or charging pump shall be the same as the
designated directions for both spray and charging pumps otherwise it cannot be normally
operated. The slush pump should be operated at a low speed to improve the suction
condition, realize a smooth operation and prolong the service life of the expendable
parts.
The spray pump or charging pump can be
driven directly by an electric motor in proper
direction.
3.3 The suction manifold
The ID of suction piping shall be at least
as large as the inlet ID of the pump. Prior to
installation, the suction manifold shall be
thoroughly cleaned from inside. After installation, no leakage should be
allowed at any connections. It is advisable to use as few valves or bends as
possible. Always use full-opening valves, such as butterfly valves, and never use
flow-limiting valve which may reduce the efficiency of the pump.
The slush pump should be provided with a
charging pump to realize a smooth operation of the pump and extend the service
life of expendable parts.
The suction manifold shall be designed to
be suitable for “dual” operation, permitting
either “natural” suction or “charged”
suction. The piping used for “natural” suction shall be as short as possible
and preferably without bends. A suction pulsation dampener (desurger) should be
connected with suction piping at either type of suction and shall be mounted as
close as possible to the pump inlet.
There shall be a safety valve between the
pump inlet and the outlet of the charging pump.
The safety valve shall be adjusted to
5kg/cm2 (70psi). It protects the charging pump from damage in the event of
overpressure occurring in the suction manifold.
3.4 The discharge manifold
According to the field conditions, the
discharge manifold can be installed on either the left or the right side of the
pump. The inside diameter of the manifold is 100mm (4”).
A pressure relief valve shall be mounted
near the discharge port of the pump to protect
the pump against damage from overpressure.
The valve shall be located ahead of any
valve on the discharge manifold. In such a
case, any unexpected starting of the pump in the event of closed valve will not
damage to the pump. The discharge piping of relief
valve shall be fastened securely and
extended safely into the slush sump to avoid any
accident resulting from high-pressure slush
with the relief valve opened.
A pulsation dampener is mounted on the
discharge manifold to reduce the fluctuation of the pressure of discharged
fluid.
3.Part List
| 107.04.140.01 |
| 107.14.110.01 |
| 107.11.110.01 |
| 107.14.110.04 |
| 107.04.140.04 |
| 107.11.01.02 |
| 107.11.110.43 |
| 107.11.98.00 |
| 107.11.110.40 |
| 107.11.110.03 |
| 107.04.120.00 |
| 107.11.97.00 |
| 107.11.110.67 |
| 107.11.70.00 |
| 107.11.96.03 |
| 107.130.16 |
| 107.11.20.17 |
| 107.164.20.00 |
| 107.130.03.00 |
| 107.11.90.06 |
| 107.11.90.03 |
| 107.11.110.01 |
| 107.11.110.14-1 |
| 107.12.20.22 |
| 107.12.20.23 |
| 107.186.00 |
| 107.11.114.01/02 |
| 107.11.303.00 |
| 107.11.110.16 |
| 107.11.20.33 |
| 107.11.20.34 |
| 107.11.110.07 |
| 107.04.110.57 |
| 107.11.110.5. |
| 107.11.110.42 |
| 107.11.96.03 |
| 107.04.110.42-1 |
| 107.164.06 |
| 107.164.10.00 |
| 107.164.20.00 |
| 107.10.110.16 |
| 107.164.02 |
