55 Pdf: Api Rp

"No reason. Keep your mask on you."

Leo pointed at the screen, where the H₂S reading was now climbing steadily. 14 ppm. 16 ppm. 18 ppm. The new alarm threshold. The old one. api rp 55 pdf

The alarm didn't go off. Not the 15 ppm alarm, anyway. But Leo had another screen—a trend graph. He watched it for a minute. Two minutes. The baseline was steady. But there, buried in the noise, was another spike. 9 ppm. Then nothing. "No reason