Data Sheet

Savings
Easily Reduce Blanketing Gas Losses.
Plant utility managers, tank farm managers, and those with
storage vessel maintenance responsibility can easily reduce their
gas blanketing expense by using low-setpoint technology.
Fisher
®
low-setpoint tank blanketing regulators allow storage
vessel operators to maintain a 0.25-inch w.c. (0,6 mbar) for
blanketing gas. Such low blanketing pressures minimize
blanketing gas losses by reducing the volume of gas being
forced through poorly sealed breather vents and incidental
escape paths. The cumulative effect of using Emerson Process
Management Regulator Technologies’ low-setpoint technology
can result in signicant savings.
Easy to Install. Easy to Maintain.
Fisher tank blanketing and vapor recovery systems offer
capabilities no other single regulator manufacturer can offer.
The low-setpoint systems are easy to install, easy to maintain
(if any maintenance is necessary) and are available in sizes with
trim materials to match your storage vessel application.
Typical Annual Expenses Calculated.
The above table demonstrates the typical incremental annual
expense of nitrogen lost when setpoints above 0.25-inch w.c.
(0,6 mbar) are used. The Universal Sizing Equation was used to
compute the amount of gas lost. To estimate the expense of
the annual gas loss, nitrogen was conservatively estimated at
$2.00/1000 scf and validated with a major nitrogen supplier.
Effective Size of the Escape Path*
1/4-inch
(6,4 mm)
1/2-inch
(13 mm)
3/4-inch
(19 mm)
1-inch
(25 mm)
1/4-inch w.c.
1/2-inch w.c.
3/4-inch w.c.
1-inch w.c.
2-inches w.c.
7-inches w.c.
$0 $0 $0 $0
$225 $899 $2,023 $3,596
$397 $1,589 $3,575 $6,356
$543 $2,171 $4,884 $8,683
$992 $3,969 $8,931 $15,877
$2,330 $9,319 $20,967 $37,275
* The effective size of the escape path is based on single or multiple escape paths that
may include pinprick holes from a slightly corroded roof, poorly seated vents, etc.
Tank Pressure
Reduce Your Gas Blanketing Expense with Emerson Process
Management Regulator Technologies’ Low-setpoint Technology.
Nitrogen Costs When Higher Setpoints are Used
D351213X012 © 2010 Emerson Process Management Regulator Technologies, Inc. All rights reserved. Printed in the U.S.A. 01/10
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