Ultra Low Temperature Resistant Bearings

Ultra Low Temperature Bearings

Cryogenic bearings are one of the key components of cryogenic liquid pumps. Its operating conditions have the following characteristics: the bearings work in a low temperature environment, LNG generally reaches -196℃; there is no lubricant during operation, and the pumping medium is used for lubrication, and the bearing lubrication environment is quite harsh; the working conditions are complex: the conveying medium often contains impurities, is corrosive, and may contain water vapor; high reliability requirements: the downtime maintenance cost is high, and the loss caused by bearing failure is large; for the use of cryogenic bearings, in order to adapt to its requirements under low temperature conditions, the above aspects should be considered during design.
LNG ultra-low temperature bearings are mainly used in cryogenic equipment such as LNG cryogenic submersible pumps. There are two main types of bearings used in cryogenic submersible pumps: deep groove ball bearings and angular contact ball bearings. This type of bearing has been serialized and produced according to international standard model sizes.

Product Details

Designation	d	D	B	Loading rate		Speed
MTS6205PTSN	25	52	15	14	7.8	17000
MTS6206PTSN	30	62	16	19.3	11.2	14000
MTS6207PTSN	35	72	17	25.5	15.3	12000
MTS6208PTSN	40	80	18	29	18	11000
MTS6209PTSN	45	85	19	31	20.4	10000
MTS6210PTSN	50	90	20	36.5	24	9500
MTS6211PTSN	55	100	21	43	29	8500
MTS6213PTSN	65	120	23	58	41.5	7000
MTS6215PTSN	75	130	25	64	48	6800
MTS6217PTSN	85	150	28	82.5	62	6500
MTS6220PTSN	100	180	34	122	93	5400
MTS6222PTSN	110	200	38	144	117	3000
MTS6304PTSN	20	52	15	15.2	8	24000
MTS6305PTSN	25	62	17	22	11	22000
MTS6308PTSN	40	90	23	42.5	25	11000
MTS6311PTSN	55	120	29	76	47.5	10000
MTS6314PTSN	70	150	35	102	66	9000
MTS6318PTSN	90	190	43	132	100	6000
MTS6320PTSN	100	215	47	160	130	5700
MTS6322PTSN	110	240	50	190	165	5400
MTS6328PTSN	140	300	62	255	250	4000

LNG ultra-low temperature bearings work in ultra-low temperature environments. There is no lubricant during operation and they are lubricated by pumped media. The bearing lubrication environment is quite harsh and requires the bearing to have a long life. The bearing ring material is G95Cr18 and G102 Cr Mo stainless steel, or imported high nitrogen stainless steel Cronidur30 (X30 CrMoN15-2) and X.D15N.W (X40 CrMoVN16-2); the rolling element material is G95Cr18 and G102 CrMo stainless steel or silicon nitride (Si3N4) or zirconium oxide (ZrO2); the cage is made of non-metallic materials with self-lubrication, wear resistance and low temperature resistance. Hybrid ceramic ball bearings made of ceramic materials have the following characteristics:

1) Strong corrosive environment (suitable for corrosive media)

2) Medium lubrication environment (such as bearings immersed in water, water as lubricant, liquid hydrogen or liquid oxygen environment, etc.)

3) No lubrication environment (dry operation)

4) Low-temperature bearings have ultra-low operating temperature

5) Completely anti-magnetic bearings, conductive or non-conductive can be achieved through different coatings.

Accuracy level

The accuracy level of low-temperature bearings is: P5, P4.

Applicable media

The low-temperature media suitable for low-temperature bearings are: LNG, CNG, LPG, LN2, LO2, LH2, LAr, liquid methane, liquid ethylene, etc.

Common problems and solutions for ultra-low temperature bearings

1. For bearings stuck at low temperatures, the external cause is the change in temperature, and the internal cause is the different thermal expansion coefficients of the shaft, frame and material. When the temperature range is large, the shrinkage rates of different materials are also different, resulting in a smaller gap and stuck. For equipment with a wide working range, including equipment used at low temperatures, it is necessary to calculate the expansion coefficient of the material, and it will be better to use materials with similar expansion coefficients as much as possible.

2. In structural design, it is necessary to avoid using a tapered bearing at each end of the shaft. In this structure, the longer the distance between the two bearings, the greater the possibility of jamming. If a stack of tapered bearings is installed at one end of the shaft, the axial movement of the shaft is constrained as the shaft is positioned, and the other end of the shaft is used with a rolling bearing to control radial force. The axial direction can move axially within a certain range with the axial temperature.

3. When using low-temperature bearings, pay attention to burns caused by poor lubrication, so pay special attention to the selection of suitable lubricants.

Our company has professional sales and technical engineers who are responsible for providing users with technical consultation, technical services and product technical training on precision bearing data and installation and use. Perfect pre-sales, in-sales and after-sales services constitute a guarantee system for high-quality services, providing users with reliable quality bearing products, and creating excellent user experience and rich benefits for every customer.

If you have any questions about products and services, please contact the company's service department directly.