Offshore Field Training: Vapor Pressure & H2S Management

Simple and Practical Guide for Operators

Introduction

    Audience

    Designed for offshore field operators with high school education level.

    Objective

    To explain RVP and H2S topics in a clear, simple, and field-relevant way.

    What is Reid Vapor Pressure (RVP)?

      Definition

      RVP is a measure of a liquid's tendency to evaporate, especially for petroleum products.

      Purpose

      Used to understand volatility and handling safety of fuels.

      Theory of RVP

        Evaporation Process

        Higher temperature or lighter molecules mean higher vapor pressure.

        Measurement

        RVP is measured using a standardized method at 100°F.

        Field Impact of RVP

          Boiling and Vapor Lock

          High RVP may cause vapor lock in engines or pumps.

          Pressure Buildup

          Storage tanks may build dangerous pressure if RVP is too high.

          Introduction to H2S

            What is H2S?

            A toxic, flammable gas with a rotten egg smell, commonly found in oilfields.

            Why It's Dangerous

            H2S can cause health issues or death at high concentrations.

            H2S Theory

              Formation

              H2S forms naturally from the breakdown of organic materials underground.

              Behavior

              Heavier than air, it can collect in low-lying areas.

              H2S Impact on Safety & Assets

                Safety Hazard

                Even small amounts can affect health; higher levels are fatal.

                Corrosion

                H2S damages metal, leading to leaks or equipment failure.

                What is H2S Scavenging?

                  Purpose

                  Used to reduce H2S content in oil, gas, and water.

                  Common Chemical

                  Triazine is widely used as a scavenger.

                  Triazine Reaction Theory

                    Reaction with H2S

                    Triazine reacts with H2S to form non-toxic solids or liquids.

                    Efficiency

                    Works well but must be dosed properly for effectiveness.

                    Field Application: Scavenging H2S

                      Injection Points

                      Triazine is injected where H2S levels are expected or detected.

                      Monitoring

                      Field staff must check H2S levels before and after injection.

                      Measuring H2S in the Field

                        Gas Testers

                        Digital devices showing real-time H2S concentration.

                        Gastec/Dräger Tubes

                        Color-changing tubes used with hand pumps for spot checks.

                        Conclusion & Safety Reminder

                          Review

                          Know RVP to handle fuels safely; use scavengers to control H2S.

                          Final Advice

                          Always test for gases and follow safety protocols in the field.