Up to 90% of failure problems of modern high-quality pumps V short term due to installation and commissioning errors. In this case, the pumps fail within 2-4 months from the date of launch. Let's look at these errors using the example of cantilever-type pumps. These pumps are considered classics of pumping production and yet with their installation and commissioning errors are the most common.

In this publication we will look at three of the most common reasons Pump breakdowns due to improper installation:

• Errors in the manufacture of the foundation
• Errors in installing vibration damping elements
• Incorrect alignment of pump and motor shafts

When considering installation errors, we will use the experience of the Service Center specialists, Regulatory documentation pump manufacturer and the Service database regarding calls to service specialists at real sites.

Here's a sample typical mistake installation cantilever pump, V in this case Grundfos:

Places of installation errors that are immediately visible are circled:

• The foundation does not meet installation requirements
• Vibration inserts are not installed correctly

Let's read what the manufacturer Grundfos says about vibration inserts in the installation instructions:

Below, from the installation instructions, is a diagram of the pump with rules for installing the vibration insert.

The picture clearly shows how it is installed vibration insert. The one and a half distance from the pump at both ends is clearly visible. The diagram clearly shows a concrete foundation under which vibration damping supports are installed.

Now let's look at another type of error that led to pump failure. In this case, the pumps did not have a foundation, vibration supports were installed incorrectly, alignment was not performed, and commissioning was not carried out, which should have revealed all this before the equipment was put into operation.

The foundation is also simple and clear regulatory requirements pump manufacturer:

But what happens when, during installation and commissioning, the pump and motor shafts are not ALIGNED

Here are the requirements for aligning pump shafts:

ATTENTION! All the pumps shown in the photo failed in a short period of time: from several days to several months. All of them were under official warranty service. However, due to non-compliance with the installation rules of the pumps recommended by the manufacturer, the warranty was canceled and repairs were carried out by the operating organization on a paid basis!

If you have questions or doubts about the correct installation or commissioning of the equipment, please contact Service Center and clarify all the necessary information.

Customer Service.

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Vibration supports for refrigeration equipment

In industrial refrigeration technology, vibration mounts are used to reduce the level of vibration transmitted from a refrigeration unit, chiller, multi-compressor station or compressor to the foundation, floor or supporting frame structure. Vibration mounts of this type are installed under the unit, the vibrations from which need to be reduced. As a rule, the need to install vibration supports arises when used as part of a refrigeration unit or multi-compressor station. piston compressors. Vibration mounts for refrigeration equipment are available in two main types:

—for indoor installation: BWZ type B, NSV type VHB, VM-5000.

— for outdoor installation: BWZ type MP, NSV type VM-3000, SRM.

The choice of vibration support model is made based on the maximum permissible load(in kg) to the vibration support specified in technical specifications manufacturer. In addition, to achieve the best result in reducing vibrations in each specific case, it is recommended to test several supports with different hardnesses. The PHS company supplies vibration supports from two well-known global manufacturers: BWZ-Schwingungs-Technik (Germany) and NSV (South Korea).

16. Vibration-damping supports and sound-absorbing material

16.1. Vibration damping mounts "BWZ" type B

Universal rubber-metal supports are used for installation under compressors, compressor units, refrigeration units, pumps, motors or fans. Designed to reduce vibration levels.

Material: natural rubber, steel parts are galvanized.

Prices of vibration damping supports BWZ

Model	Dimensions, mm						Draft, mm
	D	H	G	L	Min.	Max.	Min.	Max.
B	8	8	M3	6	0,5	2	0,12	0,7
B	10	10	M4	10	1	3	0,19	0,9
B	15	15	M4	13	1	6,5	0,1	0,6
B	15	20	M4	13	3	16,6	0,4	0,3
B	20	15	M6	15	5	20	0,32	1,18
B	20	20	M6	15	3,5	25,5	0,3	2
B	20	25	M6	15	4	27	0,4	2,8
B	25	15	M6	18	8	26	0,29	1,39
B	25	20	M6	18	5	37	0,3	1,6
B	25	30	M6	18	6	39	0,6	4
B	30	20	M8	20	8	66	0,3	2
B	30	30	M8	20	8	54	0,3	3
B	40	30	M8	23	15	105	0,5	4
B	40	40	M8	23	13	75	0,5	4
B	50	20	M10	28	20	140	0,1	0,8
B	50	30	M10	28	24	155	0,4	3
B	50	40	M10	28	24	150	0,8	5,2
B	50	45	M10	28	24	160	0,8	6
B	50	50	M10	28	25	175	0,6	4,8
B	70	45	M10	30	35	240	0,7	4,8
B	75	40	M12	37	60	410	0,7	4,8
B	75	50	M12	37	60	385	0,8	7
B	75	55	M12	37	50	375	0,8	7
B	100	40	M16	45	80	620	0,4	0,3
B	100	55	M16	45	100	670	0,8	6
B	100	60	M16	45	100	635	0,8	7
B	100	75	M16	45	100	380	1,63	7,7
B	125	55	M16	45	250	840	1,3	5,7
B	125	60	M16	45	200	780	1,25	6,5
B	125	75	M16	45	150	670	1,4	5,7
B	150	55	M16	45	400	1450	1,25	5,1
B	150	60	M16	45	300	1250	1,14	5,6
B	150	75	M16	45	300	1000	1,76	7,7
B	200	100	M16	45	500	1800	2,34	11,2

16.2. Vibration damping mounts “BWZ” type MP

Supports of type MR, in contrast to vibration damping supports of type B, have a metal protective cover, which limits the contact of rubber with oils and ultraviolet radiation. They are the preferred solution for installing equipment outside the machine room.

Prices of vibration damping supports BWZ

Model	Number of holes	Anti-lift protection	Centering					Dimensions, mm			Load at hardness 57° Shore, kg	Image
			L	L1	d	G	H	43°	57°	68°
MP184A	4	X		184	150	13	M20	63	800	1350	2100	Fig.1
MP184010	4			184	150	13	M20	63	800	1350	2100	Fig.1
MP184110	4	X		184	150	13	M20x2	63	800	1350	2100	Fig.1
MP168A	4	X		168	132	12,5	M16	52	350	650	1000	Fig.1
MP168011	4			168	132	12.5	M16	52	350	650	1000	Fig.1
MP168111	4		X	168	132	12,5	M20x2	52	350	650	1000	Fig.1
MP216A	2	X		216	184	12.5x14.5	M16	52	350	650	1000	Fig.2
MP170A	2	X		170	140	13	M12	39	140	280	440	Fig.2
MP170013	2			170	140	13	M12	39	140	280	440	Fig.2
MP170113	2		X	170	140	13	M16x1.5	39	140	280	440	Fig.2
MP234	2			234	163	16,2	M16	60	-	800	-	Fig.2
MP140	2			140	96	10,2	M12	45	-	300	-	Fig.2
MP128	2			128	110	9	M10	30	120	280	-	Fig.2
MP110	2			110	66	8,2	M10	30	-	180	-	Fig.2
MP83	2			83	53	6,2	M8	23	-	80	-	Fig.2
MP106A	2	X		106	75-90	8.3x16	M12	31	30	50	70	Fig.3
MP230 AL	2	X		230	182	18	M20	70	-	400	-	Fig.4
MP183 AL	2	X		183	140	13x15	M16	49	140	190	300	Fig.4
MP120 AL	2	X		120	100	14x11	M12	38-40	40	90	120	Fig.4

Fig.1*Fig.2*ABOUTcentered pores

*-studs are not included Supports with protectionfrom separation

Fig.3 Fig.4

16.3. Vibration damping mounts “NSV” type VHB

A neoprene vibration absorber is used for mounting small fans and air ducts.

Prices of vibration damping supports NSV

Model	Hardness, Hs	Deformation, mm	Dimensions, mm			Weight, kg
			A	B	H
VHB-40	100	60±5	5	40	11	28	0,15

16.4. Vibration damping mounts “NSV” type VM-1000

A neoprene vibration absorber is used for mounting small fans, pumps, engines, and units. The free slots make it easy to attach the shock absorber.

Prices of vibration damping supports NSV

Model	Hardness, Hs	Deformation, mm	Dimensions, mm						Weight, kg
			A	B	C	D	H
VM-1040	60	60±5	6	75	60	46	8	35	M8	0,18
VM-1050	80			90	74	60	10	40	M10	0,21
MV-1060	120			113	90	69	10	45	M10	0,31
VM-1070	150			130	105	81	12	50	M10	0,34
VM-1080	300			130	110	90	12	50	M10	0,42

16.5. Vibration damping mounts “NSV” type VM-5000

Vibration absorber made of CR neoprene with upper and lower anti-slip plates, which have excellent resistance to oil and ozone. It has the greatest static deflection, which makes it the most effective anti-vibration mount with a wide range of applications.

Prices of vibration damping supports NSV

Model	Hardness, Hs	Deformation, mm	Dimensions, mm							Weight, kg
			A	B	C	D	E	H
VM-5050	300	60±5	6	94	78	60	11	50	46	M10	0,26
VM-5065	500			122	102	82	13	66	60	M12	0,52
VM-5085	1000			150	128	104	13	87	65	M12	0,84
VM-5115	2000			188	164	130	14	114	70	M12	1,54

16.6. Vibration damping mounts “NSV” type VM-3000

The neoprene vibration absorber has a top cover made of of stainless steel, protecting the shock absorber from impacts environment, oils, water. The free slots make it easy to attach the shock absorber.

Prices of vibration damping supports NSV

Model	Hardness, Hs	Deformation, mm	Dimensions, mm						Weight, kg
			A	B	C	D	H
VM-3060	100	60±5	6	120	100	62	11	45	M12	0,24
VM-3070	300			150	126	778	13	50	M12	0,72
VM-3090	500			180	150	94	16	60	M16	1,8

16.7. Vibration damping mounts “NSV” type SRM

An improved vibration absorber made of spring-type anti-vibration rubber and a metal spring allows you to reduce the level of horizontal deflection. The outer casing is made of stainless steel to prevent corrosion when installed outdoors.

Prices of vibration damping supports NSV

Model	Hardness, Hs	Deformation, mm	Dimensions, mm						Weight, kg
			A	B	C	D	H
SRM-100	100	60±5	5,5	147	116	80	12	65	M10	0,8
SRM-200	200			147	116	80	12	65	M10	0,81
SRM-400	400			226	200	104	12	70	M12	1,71

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Alarm for drain pump panels

The alarm kit consists of a small plastic box with a cable input and a 12 V siren direct current and a red signal LED. The alarm reacts if the water volume exceeds the maximum permissible level. In this case, the signal LED lights up and the alarm emits a long sound. The active phase of the alarm continues until the error is turned off or corrected.

23.11.2011 | 13:02

Vibration damping supports of correct design are found in 10-15% of cases of their installation. Although the manufacturer's recommendations apply to pumps with a motor power greater than 11 kW, vibration and operating noise pumping unit Often you have to clean at lower capacities.

Powerful pumps vibrate quite noticeably during operation. The acoustic and mechanical components of pump vibration are often the cause of building noise and vibrations and hums. To solve these problems, in particular, vibration inserts on pipelines and vibration supports for pumps are used.

Vibration and noise of pumps:

• Noise and vibration are generated as a result of the rotation of the moving elements of the engine and pump, as well as the movement of working fluid through pipelines.
• In order to ensure optimal performance pump and to minimize noise and vibration, it is necessary to use vibration inserts and vibration-damping supports.

Let's look at what the manufacturer Grundfos says in the installation instructions regarding vibration damping mounts (vibration mounts):

And here is a diagram of the pump with correctly installed vibration damping supports.

Figure 25 clearly shows the concrete foundation under which vibration damping supports are installed. Vibration inserts are also clearly visible how to install.

ATTENTION! All the pumps shown in the photo failed in a short period of time: from several days to several months. All of them were under official warranty service. However, due to non-compliance with the installation rules of the pumps recommended by the manufacturer, the warranty was canceled and repairs were carried out by the operating organization on a paid basis!

If you have questions or doubts about the correct installation or commissioning of the equipment, contact the Service Center and clarify all the necessary information.

The need to use vibration inserts when connecting units to the pipeline is due to safety measures to prevent factors that destroy various network elements or lead to increased level noise, and for purposes galvanic isolation of the pipeline and protection of equipment from destructive mechanical impact.In addition, the use of such devices is necessary in earthquake-prone areas and when there is a danger of movement of the soil on which the equipment is installed, provided that the displacement does not exceed permissible values ​​(at higher loads it is more advisable to use special devices based on bellows compensators). The requirements of SNiP 14.15 state: “At the inputs in front of the measuring devices, as well as at the points where pipelines are connected to pumps and tanks, it is necessary to provide flexible connections that allow angular and longitudinal movements of the ends of the pipelines.” Flexible pump inserts must be installed when operating pumps with motors greater than 11kW (lower motors may also cause unwanted noise and vibration).
The rotation of the motor and pump rotors, as well as the conductive fluid in the pipeline, cause noise and vibration.
The degree of impact on equipment and the surrounding area depends on how correctly the calculations were made and the state of the remaining elements of the system. The most effective way to dampen vibration and reduce noise levels is to use vibration supports on the base plate of the units and connect the pipes to the pipeline through rubber vibration inserts. This allows you to maintain stable operation of the pumps, reduce the load on fragile cast-iron structural elements, and also minimize vibration and noise. In addition, installing compressors and pumps on vibration supports without using rubber inserts on the suction and pressure pipes leads to the equipment hanging on the flanges and, as a result, destruction of the housing of the units and pipeline fasteners. Vibration compensators for pumps help protect equipment and pipelines from vibration, as well as prevent system resonance. Depending on the material of the flow part, a vibration insert for the pump can be used in systems transporting hot and
cold water