 |
||
| Sulphuric Acid on the WebTM | Technology Manual | DKL Engineering, Inc. |
| ||||||
|
Knowledge for
the Sulphuric Acid Industry Introduction
|
A variety of valve types and materials are used throughout the strong acid system. The corrosive nature of sulphuric acid requires that special attention be paid to materials of construction to ensure long service life and reliable operation. Plug valves are used for isolation purposes and on/off service only. They are available in sizes from ½” through to 18”. Sizes larger than 8” diameter are not normally used partly due to cost and the increased flange-to-flange dimensions. For isolation purposes, gate valves are more suitable in the larger sizes.
The selection of materials for the body, plug and other wetted parts will depend on the service conditions. Butterfly valves are used primarily for flow control and regulation. The seat design will determine if the valve will provide positive shutoff. A swing-thru seat design should not be used for isolation as it will not provide positive shutoff.
(1) Other materials available, consult vendor. The selection of materials for the body, disc and other wetted parts will depend on the service conditions. Gate valves are used isolation purposes. They are not designed for throttling service.
The selection of materials for the body, disc and other wetted parts will depend on the service conditions. Globe valves are used flow control.
The selection of materials for the body, plug and other wetted parts will depend on the service conditions.
|
|
Copyright© 2005,
2006, 2007, 2008 DKL
Engineering, Inc., All Rights Reserved |
AVT (Advanced Valve
Technologies) is pleased to announce the launch of its new Sulphuric Acid Valve, able to
handle an unusually wide range of sulphuric acid duties. The new ANSI150 and PN16 valves,
based on a proprietary Novolac material technology, will accept duties in concentrations
from 1% to 99%, working at temperatures up to 190°F (90°C). This ability to handle a
wide range of concentrations in Sulphuric service is an exciting development for an
industry where extremely expensive exotic alloys struggle to cover a wide range of
concentrations whilst PTFE lined valves suffer problems due to liner failure and exterior
attack. Furthermore, the new AVT valves typically offer a 30% to 80% cost saving over
these alternative valves, and a 6 week manufacturing lead-time for project volumes -
compared to 15 weeks for some alloy materials. The new Sulphuric Acid Valve joins the
growing range of AVT products, already recognised for "class busting"
performance in Hydrochloric Acid and other corrosive media. Advanced Valve Technologies
(AVT) is the world leader in applying reinforced composite technologies to valves and
related products. Their range of 20 bar (300psi) rated full port ball and double offset
performance butterfly valves offer outstanding corrosion resistance, 60% weight savings
over metallic valves, outstanding pressure-temperature characteristics and a compelling
cost of ownership for applications in the Chemical, Offshore and Marine markets.