Blowers and fans are simple pieces of equipment, yet they require a lot of maintenance, especially the bearings. The higher the speed, the more problems they give. If all blowers and fans operated at 1200 rpm, reliability would be better – however, most run at 1800 to 3600 or more.
Many common blower problems are caused by the incorrect choice of pillow block housings, bearings, seals and lubrication systems. Let’s take a look at a few:
SNL and SNH: SNH housing causes two major problems related to sealing and lubrication for fan service. Because the lubrication reservoir is shallow, it is only suitable for grease service. An SNH block is able to work with oil when a re-circulating system is used. At high speeds, the G-type standard contact seal causes too much heat. SNH housing is superseded by SNL housing, but all parts, dimension and performance remain the same.- Split-Babbitt: For this type, the most common problem is seal oil leaks caused by the position of the automatic oiler on the housing. This style of block is only available with oil lubrication.
- Seals: Seals exclude foreign matter and retain lubricant. Application variables include shaft speed variation, dynamic shaft run-out, and temperature range. Non-contacting seals allow for a small amount of lubricant leakage, but they don’t generate heat and do not wear. Contacting seals minimize blower leakage, but cause wear and shaft friction.
When a blower problem arises, it is essential that you have knowledgeable repair technicians to help. That’s what we specialize in at Pat’s Pump & Blower! Contact us today in Orlando, Florida.