Api Rp 55 Pdf -

Then it flickered.

Was a 9 ppm flicker "non-routine"? Or was it a ghost? api rp 55 pdf

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. Then it flickered

"No reason. Keep your mask on you."

"Hey, you smell anything?" Leo asked.