Finally, a test code has been created that will provide accurate performance comparisons for both positive displacement and dynamic (centrifugal) blowers. ASME PTC 13 provides procedures for determining the required total operating electrical power of a packaged blower system, termed the “wire-to-air” performance. Here’s a review of PTC 13 and considerations related to this important standard.
The ASME PTC 13 conforming factory test facility at the Aerzen Coatesville, Pennsylvania, facility.
ASME PTC 9 and PTC 10
Previous ASME Test Codes PTC 9 for positive displacement and PTC 10 for dynamic machines were inadequate for current technologies and the demands of customers and the market.
PTC 9 for positive displacement blowers is an inactive specification. The ASME website states, “This standard is no longer an American National Standard or an ASME-approved standard. It is available for historical reference only.” For more, visit www.asme.org.
Aerzen (and others) recognized the inadequacies of PTC 10 many years ago and wrote about it in a white paper titled, “Why ASME PTC 10 is not sufficient to define the testing of a High- Speed Turbo Blower.”
1. PTC 10 allows for measuring the flow at the inlet of the blower. This assumes all the air entering the blower comes out of the discharge connection, which may not be true.
2. PTC 10 does not provide any guidelines for a contractual guarantee. Commercial items were outside the scope of this test code.
3. PTC 10 does not discuss or make any reference to the term “wire-to-air.” This was a test code primarily for bare stage testing and not appropriate for a packaged blower system with an integrated high-speed motor, variable frequency drive, controls, filtration, etc.
4. PTC 10 does not show any test arrangement where the blower is inside the box (the enclosure). Today’s customer and the market purchase a blower with a sound enclosure for the most part. The heat that could be trapped inside the enclosure and the pressure loss through the inlet air filtration will negatively impact the blower performance.
5. PTC 10 would allow a turbo blower test of just the blower core. As stated earlier, PTC 10 was written back in the days when a blower or compressor stage could be easily separated from the rest of the system and tested as an individual component.
Darrel Hill, Director of Industrial Sales, Aerzen USA.
ASME PTC 13 Goals
PTC 13 was written by a group that represented ASME, equipment manufacturers, specifying engineering authorities, and end users. Aerzen is proud to be a member of the PTC 13 Committee. PTC 13 was developed to attain the following goals:
Subscription users only!
Subscribers are able to view the whole article. Please register/subscribe (it's free and easy) to read all articles.