Although we don't believe in timing the market or panicking over market movements, we do like to keep an eye on big changes -- just in case they're material to our investing thesis.

What: Shares of hydrocarbon and industrial gas equipment manufacturer Chart Industries (Nasdaq: GTLS) were up as much as 10% in intraday trading today on higher-than-average volume.

So what: Back in November, I suggested that investors wait to see if Chart's shares would cool off. No such luck. Since mid-November, the shares have tacked on an astonishing 54%. Today's jump most likely has to do with our old pal Jim Cramer. Cramer made a pretty compelling pitch for Chart in his "Speculation Friday" segment at the end of last week. He pointed out that there are a bunch of new liquid natural gas facilities being built around the world and there is a push -- particularly in China -- to increase natural gas usage. This all adds up to more potential demand for the equipment that Chart makes.

Now what: Whether it's your Uncle Ted, Jim Cramer, or Warren Buffett giving you the idea, it's never a good idea to blindly jump on a stock because of a hot tip. Chart is well-positioned within its industry and has established relationships with many key players from Praxair (NYSE: PX) on the industrial gases side, to Jacobs Engineering (NYSE: JEC) in construction and ExxonMobil (NYSE: XOM) (among many others) in the natural gas field. That said, the stock has been soaring lately, is trading at a pricey multiple of expected 2011 earnings, and was referred to by Cramer as a speculation. There may be good reason for investors to be eyeing Chart, but they'd be well advised to dig in and do some of their own research before jumping in.

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Fool contributor Matt Koppenheffer does not own shares of any of the companies mentioned. You can check out what Matt is keeping an eye on by visiting his CAPS portfolio, or you can follow Matt on Twitter @KoppTheFool or on his RSS feed. The Fool's disclosure policy prefers dividends over a sharp stick in the eye.