2QS type steam reciprocating pump

NegotiableUpdate on 03/27

Model

Nature of the Manufacturer: Producers

Product Category

Place of Origin

Online Consult

Overview

The 2QS steam reciprocating pump is a pumping equipment that uses steam as power and operates based on the principle of a pump. It is mainly used for small and medium-sized boiler feedwater, oil refinery transportation of petroleum products, mine drainage, etc. The piston rings of various steam reciprocating pumps are only suitable for water temperatures that cannot exceed 60 ° C. If the water temperature exceeds this temperature but is within 105 ° C, high-quality canvas interlayer packing must be replaced to make the cylinder piston rings. The theoretical suction stroke of various steam reciprocating pumps is 10.3 meters, but in actual use, the suction head, including pipeline resistance, should not exceed 7 meters. When pumping hot water, the suction head decreases with the increase of water temperature. If the water temperature is too high or the pipeline resistance is too large, the lowest water level in the inlet pool must be higher than the cylinder and cylinder centerline of the steam pump.

Product Details

Overview

QS type steam reciprocating pump model meaning:
Example 2QS-4.8/17
2-Double cylinder
Q-Steam driven
S-Transport medium is water
4.8- Flow Value (m3/h)
17- Pressure value (1.7Mpa)
The main purpose of QS type steam reciprocating pump is:
The 2QS steam reciprocating pump is suitable for boiler feedwater, mine drainage, and transportation of petroleum products or neutral liquids. According to the requirements of different flow rates, it is manufactured in 12 specifications, with a minimum flow rate of 1.3m3/h and a maximum flow rate of 225m3/h.
Installation Instructions
1. The machine must be installed on a concrete foundation and kept level.
2. Each part of the pipeline should be fixed with brackets and should not be pressed onto the machine body.

cause of failure

fault	root cause	Elimination method
The inlet valve is open and the pressure is normal, but the pump is not running.	1The water pipe valve is not open.2The exhaust pipeline valve is not open. 3、 Before starting, the wrong valve was in the middle position, which prevented steam from entering the cylinder. 4Foreign objects enter the cylinder, causing the piston ring to break or get stuck. The packing box and copper sleeve may cause the piston ring to get stuck or bend.	1Open the drainage pipe and exhaust valve, and to prevent sudden impact, close the inlet valve in advance. 2Same as above.3、 Close the inlet valve and manually move the piston rod away from the center position. 4、Close the inlet valve and push the piston rod. Check the coupling and piston rod. If there are any problems, replace them in a timely manner.
b)There is no water supply or insufficient flow after starting, and there is noise during operation.	1The suction height is too high or there is excessive hydraulic loss in the suction pipeline. 2When there is a large suction height, the suction pipeline is not filled with liquid.3Leakage in the cylinder head or packing box of the suction pipeline. 4The temperature of the conveying medium is too high. 5The viscosity of the conveying medium is too high. 6Valve leakage, bent valve stem, or inadequate sealing between valve cover and valve seat. 7The excessive elasticity of the suction valve spring limits the opening height of the suction valve.8The hydraulic cylinder piston is leaking water. 9Leakage under the hydraulic cylinder.	1Reduce the suction height or decrease the resistance in the suction pipeline. 2Fill the suction pipeline with liquid. 3Pull the piston, locate the leak, reinstall the packing, and tighten the cylinder head. 4Reduce the temperature of the medium. 5Heat to reduce the viscosity of the medium. 6Remove the valve cover from the valve chamber, inspect the valve, and if necessary, grind the valve and seat or replace the valve stem.7Remove the valve box cover and pressure cover, and reinstall the spring as required. 8Disassemble the piston rod and piston of the hydraulic cylinder, check the clearance between the piston ring and the liner, and replace the damaged piston ring. 9Close the drain valve.
Insufficient travel under the specified pressure.	1Leakage of steam from the sealing ring of the wrong valve and piston;	1Use a feeler gauge to check the tightness of the sealing ring, cylinder, and misalignment valve liner, and replace damaged sealing rings;
	2Excessive exhaust steam pressure;	2Reduce exhaust steam pressure;
	3、 The valve resistance on the inlet pipeline is too high.	3Open the inlet valve to reduce resistance.
There is abnormal sound during operation.	1The piston stroke is large and the steam distribution is disordered;	1Reduce the stroke with the inlet valve and check the position of the wrong valve with a template (it should be in the middle);
	2See aboveb) 1~9;	2See aboveb) 1~9;
	3The stroke is too long, and the valve spring elasticity is weakened or damaged.	3、 Adjust the intake structure, reduce the piston stroke, remove the valve cover, and check the spring for adjustment or replacement.

Detailed explanation of structure

1、 Detailed explanation of QS steam reciprocating pump mechanism:
1. The 2QS series steam reciprocating pump is a double cylinder, double acting, horizontal pump directly driven by steam.
2. The mechanical structure can be divided into a cylinder part and a hydraulic cylinder part, connected together by a middle section. The center frame is mounted on the middle section, and for the convenience of processing, the piston rod is divided into two sections and connected together with a coupler.
2、 Steam reciprocating pump hydraulic cylinder section:
The cylinder body is made of cast iron and contains cylinder liners. A bracket is connected below the cylinder body. There are 8 flat valves on the upper part of the cylinder body, 4 of which are suction valves and 4 are discharge valves. The valves and valve seats are made of cast copper.
3、 Mid section of steam reciprocating pump:
The middle section is a connecting mechanism that integrates the cylinder and the hydraulic cylinder, with packing boxes at both ends and packing covers installed to adjust the tightness of the packing. The packing can be made of oil immersed asbestos rope.
4、 Steam reciprocating pump cylinder section:
The cylinder block is made of cast iron, with a bracket and foundation fixed at the lower part. A staggered steam box is installed at the upper part of the cylinder, with two flat staggered steam valves inside to control the entry and exit of steam. By swinging the lever and reciprocating the displacement rod, the piston is pushed to perform reciprocating motion.
5、 Lubrication of steam reciprocating pump:
All parts are manually lubricated. The lubricating oil for the leveling valve and piston ring is supplied by the thin oil cup on the cylinder, while the lubrication for other parts such as the swing rod and piston rod of the center frame is manually injected.

Performance Characteristics

Performance characteristics of QS type steam reciprocating pump：
(1) The discharge pressure of the pump depends on the steam pressure, and since the cylinder area is generally 2-2.5 times larger than the water cylinder area, a higher pressure can be obtained. If friction resistance loss is not taken into account, a water pressure of 2-2.5 times the boiler steam pressure can be generated on the water cylinder piston.
(2) The flow rate of the pump depends on the flow rate of steam, which is relatively easy to adjust. This type of pump cannot adjust the flow rate by throttling the valve opening on the outlet pipe. Generally, the flow rate can be adjusted by adjusting the opening of the inlet valve, or by bypassing the outlet pipe and returning it to the inlet pipe. This pump can adapt to large load changes.
(3) It has a high efficiency, generally reaching 80% to 95%.
However, the structure of the steam reciprocating pump is bulky, the size is large, the transmission mechanism is complex, the operation is complicated, it consumes a lot of steam, and the cost is high. Due to these reasons, steam reciprocating pumps are no longer used as the main feedwater equipment for boilers and are generally only used as backup pumps during power outages. However, some boiler rooms still consider the continuous water inlet of the economizer and use the steam reciprocating pump, which is easy to adjust the flow rate, as the daily water supply equipment for the boiler.
The 2QS (QB) horizontal double cylinder, double acting, piston type steam reciprocating pump is a pumping equipment that is powered by steam and operates according to the principle of the pump. Its main advantages are simple structure, easy installation, use, and maintenance. As long as the steam and inlet/outlet pipelines are connected, it can be used for both general water supply and small and medium-sized boiler feedwater. If the piston and certain parts in the cylinder are replaced, it can also be used for transporting petroleum products in refineries, mine drainage, etc.
The cylinder working pressure of various steam reciprocating pumps is 1.4Mpa, the temperature does not exceed 200 ℃, the maximum discharge pressure is 1.7Mpa, the conveyed liquid is at room temperature of 60 ℃, and the starting steam pressure of the pump is not less than 0.3Mpa, suitable for saturated steam and superheated steam.
Structure and working principle of QS type steam reciprocating pump：
A steam reciprocating pump is a type of direct acting reciprocating pump powered by steam, usually horizontal. The working principle of a reciprocating pump is that steam enters the distribution chamber from the inlet pipe, and then enters the cylinder through the inlet on the left side of the cylinder. The cylinder piston moves to the right under the action of steam pressure, and the exhaust steam is discharged into the exhaust chamber from the exhaust port on the right side of the cylinder. At the same time as the cylinder piston moves, it pushes the pump chamber piston connected to the piston rod in the same direction, creating a vacuum in the left pump chamber of the water cylinder. Water is drawn into the left pump chamber through the suction pipe and the left inlet valve. At the same time, open the water outlet valve on the right to press out the water. When the cylinder piston moves to the top right position, the left movement of the connecting rod closes the inlet on the left side of the cylinder and opens the inlet on the right side, allowing steam to enter and the piston begins to move left again. The water pump piston draws water from the right and pumps it out from the left. By continuously reciprocating the water pump piston with the cylinder piston, water can be continuously drawn in and pressurized out.

Technical Specifications

new model	old model	cylinder diameter	Diameter of water tank	Reciprocating travel	traffic	Repetition frequency	Inlet steam	exhaust steam	water ingress	water outlet
new model	old model	mm	mm	mm	m3/h	Times/min	mm	mm	mm	mm
2QS-4.8/17	QB-3	115	70	102	3-6	38-70	15	20	50	40
2QS-9/17	QB-4	133	89	127	5-11.5	30-64	20	32	65	40
2QS-15/17	QB-5	152	102	152	6-16.5	30-60	25	32	80	50
2QS-21/17	QB-6	190	110	200	11-21	30-50	40	50	100	80
2QS-2917	QB-7	190	130	200	16.5-29	30-50	40	50	100	80
2QS-53/17	QB-9	250	150	250	22.5-44	26-45	50	65	125	100
2QS-63/17	QB-11	300	80	300	38-63	24-40	50	65	150	100

Explanation: The above specifications are commonly used for backup water supply in small and medium-sized low-pressure boilers during power outages. If used for transporting petroleum or high-temperature oil products, please contact our company for relevant part modifications before leaving the factory.

QS type steam reciprocating pump specifications for medium pressure steam pump:

new model	cylinder diameter	Diameter of water tank	Reciprocating travel	traffic	Repetition frequency	Inlet steam	exhaust steam	water ingress	water outlet
new model	mm	mm	mm	m3/h	Times/min	mm	mm	mm	mm
2QS-9/25	152	80	152	5.5-9	30-60	20	40	65	40
2QS-12/25	152	80	152	6-12	30-60	20	40	65	40
2QS-53/25	250	130	250	24-40	30-50	50	65	125	100

Explanation: The above specifications are commonly used for backup water supply during power outages in small and medium-sized low and medium pressure boilers. If used for transporting petroleum or high-temperature oil products, please contact our company for relevant part modifications before leaving the factory.