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Noncircular

Multibolt

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Four-Bolt

Circular

Multibolt

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Before Installation

• Remove old gasket, and clean flange surface of all

debris. For best results, use a metal flange scraper, an

aerosol gasket remover and a wire brush, then inspect

the flange for damage. Be sure surface finish and flat-

ness are satisfactory.

• Use the thinnest possible gasket. However, flanges 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 flange

surface that is too smooth to be effective.

Installation

• Center the gasket on the flange. 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 flat 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 flange 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

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 fiber 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 specific applica-

tion should not be undertaken without independent study and evaluation for suitability.

For specific 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 field testing,

customer field reports and/or in-house testing.

While the utmost care has been used in compiling this brochure, we assume no respon-

sibility for errors. Specifications 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.