Questions regarding the lubricating oil for centrifugal pumps
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This post was last edited by yxmqh on 2010-11-10 at 10:06. Does anyone know which has a higher viscosity, ISOVG 46 or ISOVG 32, for the lubricating oil used in centrifugal pumps? What does ISOVG mean? What does the lubricant PULSALBE1 mean? What are the differences between these two types of lubricants?
This post was last edited by yxmqh on 2010-11-10 at 10:06. ISOVG46 – the correct notation should be ISO VG46; it has a high viscosity, which is easy to tell. Solved
ISO VG46 has a high viscosity
VG46 has a higher viscosity. VG46 means that the dynamic viscosity of the lubricant at 40°C is 46 cSt (mm/s)
Reply to 1# Qia Classmate: In the past, industrial lubricants in our country were generally classified based on their dynamic viscosity at 50°C, such as machine oils of grades 10, 20, 30, etc., whose viscosities at 50°C were 7–13, 17–23, and 27–33 mm2/s (centistokes) respectively. Some lubricants were classified according to their dynamic viscosity at 100°C, such as compressor oils of grades 13 and 19. To align with international standards, the standard GB3141-82 “Classification of Viscosity for Industrial Lubricants” was established, drawing on the ISO 3448-75 standard “Industrial liquid lubricants – ISO viscosity classification”. This viscosity classification is based on the dynamic viscosity at 40°C; it divides the range into 6 equal logarithmic intervals: 1–10, 10–100, 100–1000, and 1000–10000. The values are rounded to two significant figures to determine the central viscosity value, with a minimum value of 2.2 and a maximum value of 1500. The maximum deviation of the viscosity values across the various centers is ±10%. The product viscosity grade is expressed as an integer representing the central viscosity value in mm²/s. The classification of various viscosity grades is shown in Table-1. Table 1 – Classification of viscosity grades for industrial lubricants. National standard viscosity grades, ISO viscosity grade, central value, kinematic viscosity in mm2/s at 40°C, and range of kinematic viscosity: 2 ISO VG 22: 22.2–1.98–2.42; 3 ISO VG 33: 33.2–2.88–3.52; 5 ISO VG 54: 46.4–4.14–5.06; 7 ISO VG 76: 68.6–6.12–7.48; 10 ISO VG 100: 109.0–11.0; 15 ISO VG 150: 151–13.5–16.5; 22 ISO VG 220: 221–19.8–24.2; 32 ISO VG 320: 322–28.8–35.2; 46 ISO VG 460: 464–41.4–50.6; 68 ISO VG 680: 686–6.12–74.8; 100 ISO VG 1000: 1009–90.0–110; 150 ISO VG 1500: 1500–1350–1650
Reply to 1# Qia Classmate Youth: Table 6, Part 4: Group H (Hydraulic Systems) ISO6743/4-1982. Group symbols, special application characteristics, ISO-L symbols, typical applications, and remarks: H – Hydrostatic systems; refined mineral oil without antioxidants. HH – Refined mineral oil with improved rust and oxidation resistance. HL – HL oil with improved wear resistance. HM – Oil for high-load components, with improved viscosity-temperature properties. HV – Used in mechanical marine equipment; this is the standard used in domestic products. As for PULSALUBE #1, it is a special synthetic hydraulic fluid; it’s a brand from the United States. It is a SPECIAL PURPOSE HYDRAULIC FLUID AND GEAR OIL designed for use only in PULSAFEEDER pumps. Operating temperature range: +10℉ to +150℉; can be used up to 280℉ in remote head applications. “Remote Head Hydraulic Fluid” is also a hydraulic fluid, but it’s synthetic rather than mineral-based, so it cannot be mixed with other types of fluids.
Lubricant PULSALBE No. 1 is suitable for operation in temperatures ranging from 40°F to 280°F. Performance: API specific gravity = 28-30; viscosity of SUS at 100°F = 450; viscosity of SUS at 210°F = 73-78; viscosity index = 95-160; flow point = 150 to -25°F. Ball wear test: 1800 revolutions per minute, 20 kg load. 130°F for 1 hour = 0.30 MM crack diameter; acceptable. Load capacity of chromium-nickel-molybdenum heat-resistant steel = 60–70 pounds. Passed rust resistance test (ASTM D-665); passed emulsification resistance test (ASTM D-2711); passed oxidation test (ASTM D-2893). Shell Durastar series – T46 and T32 are both suitable
The explanation upstairs is quite detailed; let me add a few points: ISO refers to the so-called international standards, while VG is an abbreviation for viscosity grade – the higher the value, the greater the viscosity. However, when choosing lubricant, viscosity alone should not be the only factor considered.
Refers to l-an46 and l-an32