This is why you don't test chiller plant systems at 3pm on a Friday.
We're not (this is an old pic #FBF ha!) ...BUT it still illustrates why it's important to consider risks and timing/staffing when coordinating schedules for functional testing.
Here, the story was that pumps were scoped as minor equipment, and therefore only 50% of start-ups were required to be witnessed by the CxP (to ensure at the very least that the start-up procedures were being followed correctly).
During a pump start-up, motor shaft rotation is checked in 1) hand/manual, 2) auto, and 3) vfd bypass modes (to make sure we're pushing water in the correct direction--real important, easy to check). When you bypass a VFD, that motor shaft gets 100% power immediately (no ramp up...and, well, actually maybe a little spurt more energy than 100% if ya wanna get into electrical details. But full on, right away, either way) So that's one that's important thing to check, but often it gets missed because the need for a bypass isn't always understood (or actually used), and...well, really, it's third on the checklist (less sarcastic, more realistic tone here).
Anyway... one of the pump bypass checks was missed in startup. Water blasted the wrong way and out of the pipes and equipment through system path of least resistance (maybe even our through the fittings, I don't remember). I learned how to help out with squeegee clean up that day. Also, anymore, while it might mean trading off with something non-critical, I include all plant equipment 100% in that "witnessing start-ups" scope item, too!
Well.. I had to share this training opportunity (again) from the BCA since it's the best-in-class, not-a-lecture training experience that is provided.
Here's the low-down:
Registration (http://www.bcxa.org/bcxa-university/in-classroom-courses/)The registration website may seem a little confusing, but it's meant to be flexible for attending part or all of the class days. Here's the deal:
You can attend for just 2 days for either New Construction or Existing Buildings. Just click on the "Register" buttons in each section (as shown above). OR.... to attend BOTH...
CLICK the link in either section that says "Register Here for Both Courses - NOV 6-9".
It's for real. We'll see you there!
Ha. Just saw this. We're rowdy, but only cuz we love and know our stuff. 🤜🤛Can't wait to trade the latest building QA/QC notes with this crew next month!
National Conference Time, Building Pros!! http://www.bcxa.org/ncbc-2017/
Nate is a real life Iron Man. Got to meet him and hang out when we was hosting and I was judging the Nat'l Future Cities finals in DC during Engineer's Week several years ago. Maybe I should contact him again now that ladder work has become the bane of my existence. I've also used his Alien-In-My-Pocket series videos for bottle rocket building and other Sci activities with the K-12 kiddos.
Check it all out.
Today's “How-To” is a small love note with a big impact.
We found a great site that should keep you on your toes with HVAC&R technical: It’s HVACR School (.com).
With so many fish in the sea, sometimes it’s difficult to find a good catch as far as training and refresher material go. And, in commissioning especially, it’s critical to keep up with the latest savvy-technician kind of troubleshooting for all types of equipment. We’ve been loving the podcasts and quizzes on the site so far. The content has been pretty great, and it’s delivered in a way that’s easy and interesting to listen to. On the week, we’ve got a little lovefest going on for this site, and hope you enjoy it, too.
p.s. This isn't a paid endorsement (schyeah, right!)--It's just a good find on the week! Enjoy.
Tracey Jumper, CCP