07272017Thu
Last updateWed, 26 Jul 2017 7pm

i

How to Choose the Best Rapid Prototyping Method

How to Choose the Best Rapid Prototyping Method

As new products are designed, including ...

Monitoring Valve Health via the Internet

Monitoring Valve Health via the Internet

Most valve end users are already using s...

Valves in Oxygen Service

Valves in Oxygen Service

In his presentation at VMA’s 2017 ...

Thermal Spray Coating

Thermal Spray Coating

Q: What are the pros and cons of us...

Subscribe SUM17

FREE SUBSCRIPTION*

•  Print magazine
•  Digital magazine
•  VALVE eNews
Read the latest issue

*to qualified valve professionals in the U.S./Canada

The Weekly Report

New Products

  • ja-news-2
  • ja-news-3

Industry Headlines

TAQA Awards Schlumberger EPCIC Contract for Otter Field

Wednesday, 26 July 2017  |  Chris Guy

OneSubsea, a Schlumberger company, has been awarded an engineering, procurement, construction, installation and commissioning (EPCIC) contract for a s...

Readmore

Loading...
Advertisement
i

Web Only

The Actuation Selection Process

The Actuation Selection Process

Tuesday, 25 July 2017  |  Carlos Gamero

A common misconception in our industry is that actuating a valve is as simple as putting the most cost-efficient actuator on top of your valve of choi...

Readmore

Loading...

Industry Headlines

TAQA Awards Schlumberger EPCIC Contract for Otter Field

8 HOURS AGO

OneSubsea, a Schlumberger company, has been awarded an engineering, procurement, construction, installation and commissioning (EPCIC) contract for a subsea multiphase boosting system by TAQA for the Otter field in the UK North Sea. OneSubsea leverages Cameron flow control, process technologies and m...

Readmore

Crane Co. Reports Second Quarter Results

1 DAY AGO

Crane Co. reported second quarter 2017 earnings of $1.14 per diluted share, compared to $1.15 per share in the second quarter of 2016. Excluding Special Items, second quarter 2017 earnings per diluted share were $1.17, compared to $1.21 per share in the second quarter of 2016.

Second quarter 2017 sale...

Readmore

Shale Sector to Be Cash Flow Positive by 2020

9 HOURS AGO

The tight oil sector has struggled to generate positive cash flow since 2010. Last year, only one company in the sector posted positive cash flow. But there is light at the end of the tunnel. Wood Mackenzie’s new report " When will tight oil make money? " calculates that the five largest tight oil...

Readmore

U.S. Chemical Production Moved Higher in June

1 DAY AGO

According to the American Chemistry Council (ACC), the U.S. Chemical Production Regional Index (U.S. CPRI) edged higher by 0.3% in June, following a 0.3% gain in May, and a 0.4% decline in April, as measured on a three-month moving average (3MMA) basis. During June, output grew in all regions except t...

Readmore

U.S. Consumer Confidence Rebounds in July

14 HOURS AGO

The Conference Board Consumer Confidence Index, which had declined marginally in June (a downward revision), improved in July . The Index now stands at 121.1, up from 117.3 in June. The Present Situation Index increased from 143.9 to 147.8, while the Expectations Index rose from 99.6 last month to 103...

Readmore

IHS Market PMI Index Reached Four-Month High in July

1 DAY AGO

July data revealed a further acceleration in business activity growth across the U.S. private sector. At 54.2, up from 53.9 in June, the seasonally adjusted IHS Markit Flash U.S. Composite PMI Output Index signaled the strongest rate of expansion since January.

The pickup in business activity growth ...

Readmore

Process Control Goes Green

Oil and natural gas operators can help reduce methane and other emissions—and increase revenue—by replacing traditional pneumatic devices with energy-responsible pneumatic pressure and level control devices.

 

An estimated $20 billion or more in revenue is lost each year globally due to methane emissions. Coupled with this lost revenue, global greenhouse gas emissions (GHG), of which methane comprises a substantial portion, have been gaining ever increasing visibility from a variety of agencies, special interest groups, national and international companies, politicians and the general public. It’s clear that a substantial problem exists. Many companies, however, are looking to alleviate that problem by changing their methods of operations and sharing best practices with each other.

THE METHANE FACTOR

Countless studies have analyzed the net effects greenhouse gases have on our environment and have resulted in a diverse range of views on the subject. However, one accepted fact is that methane is the most potent of the global greenhouse gas (GHG) emissions. Each year significant amounts of methane—the primary constituent of natural gas—are emitted into the atmosphere. These emissions cause concern because of the increasing negative effects on the environment as a whole, as well as the large amounts of revenue lost as a result. The importance of reducing methane emissions cannot be understated; but with innovative technology and implementation of best practices, the entire world’s industries can shift toward using more environmentally responsible products for process control functions. This shift in thinking will also result in cost savings and increased revenue.

Many owners and operators at oil and gas production, processing and transmission facilities have already taken initiatives to eliminate or reduce methane emissions. One shining example, which illustrates the widespread collaboration among companies, is the EPA Natural Gas STAR program. This program is a voluntary partnership between the U.S. Environmental Protection Agency and numerous natural gas companies, which provides a way to share best practices for reducing emissions among member companies. Currently, the program includes 23 of the top 25 natural gas producing companies which constitute 62% of the production, processing, transmission and distribution of natural gas. It also constitutes 62% of the production, processing, transmission and distribution of natural gas. As Figure 1 illustrates, in the 14 years since the program was established, more than 577 billion cubic feet of methane emissions, at a value of $3.4 billion, have been eliminated through voluntary initiatives by the member companies—initiatives that have also provided these companies cost savings and increased operational efficiency.(1)

This article provides examples of opportunities to reduce methane emissions in oil and natural gas applications, and highlights the significant cost savings that can be realized by implementing available technologies in the process control market. The primary methane emissions mitigation method discussed in this article is identification and replacement of high-bleed pneumatic pressure and level control devices.

PNEUMATIC CONTROL DEVICE BASICS

Continuous bleed pneumatic controllers are used in the oil and natural gas industry to regulate level, flow-rate, temperature or pressure. Given the infrastructure for installing these devices, natural gas may be the only option for a supply medium in places where it is not possible, economical or convenient for installing compressed air systems.
Nearly all pneumatic devices use the same basic design principle, which consists of a nozzle-flapper mechanism (Figure 2, left) that executes throttling control and exhibits continuous or intermittent bleed of the supply medium. Varying the separation between the flapper and nozzle alters the resistance to gas flow. Increasing the distance between the nozzle and the flapper reduces nozzle resistance and output pressure, while decreasing the distance has the opposite effect. In most pneumatic devices that use this concept, the inherent design of the nozzle flapper mechanism is the only reason the supply medium bleeds to the atmosphere.

Controllers that use a three-way valve for proportional band control also introduce another way for supply gas to bleed to the atmosphere (Figure 2, right). Some pneumatic controllers are designed to bleed only when the unit is in transient operation, or cycling, while others bleed both during steady-state conditions and transients. The steady-state bleed tends to dominate the emissions reduction focus; however, consumption during transients should not be underestimated because of the potentially significant effect on the total amount of gas consumed by the device.

  • Latest Post

  • Popular

  • Links

  • Events

Advertisement

Looking for a career in the Valve Industry?

ValveCareers Horiz

To learn more, watch the videos below or visit ValveCareers.com a special initiative of the Valve Manufacturers Association