SEO Version
C-43
Circular
Four-Bolt
Noncircular
Multibolt
Square
Four-Bolt
Circular
Multibolt
Circular
Four-Bolt
Noncircular
Multibolt
Square
Four-Bolt
Circular
Multibolt
Before Installation
• Remove old gasket, and clean fange surface of all
debris. For best results, use a metal fange scraper, an
aerosol gasket remover and a wire brush, then inspect
the fange for damage. Be sure surface fnish and fat-
ness are satisfactory.
• Use the thinnest possible gasket. However, fanges that
are warped, bowed or severely pitted require thicker
gaskets.
• Whenever possible, use ring gaskets. Full face gaskets
have more surface area, requiring additional compres-
sive load on the gasket.
• Use dry anti-seize, rather than wet. Talc is best, while
graphite and mica are also acceptable. Never use
metal-based anti-seize, since particles may accumulate
in the surface imperfections, thereby creating a fange
surface that is too smooth to be effective.
Installation
• Center the gasket on the fange. This is extremely vital
where raised faces are involved.
Note:
Standard ANSI ring gaskets, when properly
cut, should center themselves when the bolts are in
place.
• Use a torque wrench and well-lubricated fasteners with
hardened fat washers to ensure correct initial loading.
• Tighten bolts to compress gasket uniformly. This means
going from side to side around the joint in a star-like
crossing pattern. See diagrams at right.
• All bolts should be tightened in one-third increments,
according to proper bolting patterns.
• Retorque 12 to 24 hours after start-up, whenever pos-
sible. All applicable safety standards including lockout/
tagout procedure should be observed.
• Never use liquid or metallic based anti-stick or lubricat-
ing compounds on the gaskets. Premature failure could
occur as a result.
The minimum recommended assembly stress for
Garlock compressed sheet, GYLON
®
and GRAPH-LOCK
®
products differs from "M" and "Y" values. "M" and "Y"
do not take factors such as fange condition and blow-
out resistance into account. Garlock offers the following
minimum assembly stresses as rules of thumb to use to
calculate installation bolt torques.
Operating Minimum Assembly Stress Recommended
Pressure
psi (N/mm
2
)
in psig
1/32" (0.8 mm) 1/16" (1.6 mm) 1/8" (3.2 mm)
(bar)
Thick
Thick
Thick
Up to
2,500
3,600
4,800
300 (21)
(17)
(25)
(33)
Up to
4,800
5,400
6,400
800 (55)
(33)
(37)
(44)
Up to
7,400
8,400
9,400
2,000 (140)
(51)
(58)
(65)
Maximum recommended compressive stress for:
■
Compressed fber and GYLON
®
gaskets = 15,000 psi
■
GRAPH-LOCK
®
gaskets = 10,000 psi
■
STRESS SAVER
®
gaskets = 600 - 1,200 psi
■
Rubber gaskets to 60 duro = 600 - 900 psi
■
Rubber gaskets to 70 duro and higher = 600 - 1,200 psi
Correct Bolting Patterns
Gasket Assembly Stress
Recommendations
WARNING:
Properties/applications shown throughout this brochure are typical. Your specifc applica-
tion should not be undertaken without independent study and evaluation for suitability.
For specifc application recommendations consult Garlock. Failure to select the proper
sealing products could result in property damage and/or serious personal injury.
Performance data published in this brochure has been developed from feld testing,
customer feld reports and/or in-house testing.
While the utmost care has been used in compiling this brochure, we assume no respon-
sibility for errors. Specifcations subject to change without notice. This edition cancels
all previous issues. Subject to change without notice.
GARLOCK is a registered trademark for packings, seals, gaskets, and other products
of Garlock.
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