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Gasket Installation Procedure
 
When the use of Compressed Asbestos was widespread and it was the "general service" sheet, everyone learned how to install it to achieve optimum performance. The foundation of most installation procedures for standard flange gaskets was the B7 bolt. This bolt affords sufficient torque to put the necessary stress loads on the gaskets to achieve leak free seal.

Today, there are various gasket materials where there was one. Flexible Graphite, filled PTFE and the variety of Compressed sheets cannot take this stress load without being damaged. In addition, each of these different materials require different stress loads to affect a seal. As a result, the proven installation practices that worked so well have been either altered or abandoned. Frenzelit's Compressed Graphite Gasket Sheets are engineered to seal at these stress loads.

Our extensive successful field experience has proven that using B7 bolts and following this installation procedure provides long-life and leak free performance from Frenzelit's Compressed Graphite sheets. You will get maximum performance from our gasket sheet when you use our Gasket Installation Procedure.
1. Clean and inspect the flanges. 

2. Clean or replace your bolts with B7 bolts, nuts and washers.
B7 bolts are highly recommended because they will pull straight or misaligned flanges tight enough together to properly compress the gaskets and effect a seal. Grade 2 bolts don't have the strength to withstand the torque required to achieve proper installation. A grade 2 head is bare and a B7 is black and has B7 on it as illustrated below.

3. Lubricate the B7 bolt's thread, nuts, washers and the underside of the head with Fel Pro C5A. This lubricant offers the best torque
co-efficient and gasket stress distribution. This is based on Ecole Polytechnique of Montreal's test results. Used gaskets coming out broken or in pieces indicates an insufficient stress load on the gasket.

4. Flat washers are recommended to assure even distribution of
the bolting force.

5. Use a torque wrench. The use of a torque wrench is highly recommended. This assures a longer life and leak free performance. Just as a good auto mechanic uses a torque wrench to install an automotive head gasket, a flange gasket should be torqued using
our torque guide.

 6. The next step is to select the most desirable tool for the job. There are several types of torquing tools on the market. Power tools are time saving but should be used only on non-critical applications. Impact wrenches, even those with control devices, have too many variable dynamic forces to provide the proper bolt stress. With the B7 specification bolts, proper installation can be achieved with the use of click type torque wrench or direct dial reading torque wrench.

7. Torque the B7 bolts to the value found on the chart below. Make four even increment passes in a 12-6-3-9 o'clock pattern sequence as shown.

8. Phelps Styles 7075, 7085, 7095 and 7097 Compressed gasket sheets are specifically designed with a high performance anti-stick coating compound. No need to use a scrapper or hammer and chisel; your used gaskets will be hard and they will fall off the flange. Do not paint the gasket surface or the flange with a sealant, anti-stick or anything else; this will cause gaskets to leak. Install your gaskets dry!
Why use B7 bolts?
4" ring gasket for 150 lb. ANSI pipe flange
with (8) 5/8" diameter bolts
Grade B7: National Course - Torque to 80% of yield = 198 ft./lb.
Grade 2: National Course - Torque to 80% of yield = 98 ft./lb.
Resulting Gasket Stress
Using Grade B7 bolts = 7170 stress
Using Grade 2 bolts = 3550 stress

Results: 100% higher gasket stress using grade B7 bolts

 Why four pass torquing?
4" ring gasket for 150 lb. ANSI pipe flange
with (8) 5/8" diameter Grade B7 bolts lubricated with Fel Pro C5A
One pass torquing: Bolting efficiency = 50%
Four pass torquing: Bolting efficiency = 75%
Resulting gasket stress
One pass = 4782 stress
Four pass = 7173 stress

Result: 50% higher gasket stress with four pass torquing
Why lubricate the bolts, nuts and washers with Fel Pro C5A?
Grade B7: National Course - Torqued to 80% of yield = 198 ft./lb.
4" ring gasket for 150 lb. ANSI pipe flange
with (8) 5/8" diameter Grade B7 bolts
Existing bolts, unlubricated
Friction factor = 0.25
New bolts lubricated with Fel Pro C5A
Friction factor = 0.15
Resulting gasket stress at 198 ft./lb.
Dry B7 bolts = 5738 stress
C5A lubricated B7 bolts = 9564 stress

Results: 67% higher gasket stress with lubricated bolts

Torque Guide for
Frenzelit NOVATEC 825F, 925F, Premium, novapress multi II and novapress multi EG
Compressed gasket sheets are specifically designed with a high performance anti-stick coating compound.  No need to use a scrapper or hammer and chisel; your used gaskets will be hard and they will fall off the flange.  Do not paint the gasket surface or the flange with a sealant, anti-stick or anything else; this will cause gaskets to leak. Install your gaskets dry! Used gaskets coming out broken or in pieces indicates an insufficient stress load on the gasket.
Torque Guide for ASTM A-193 Grade B7 Bolts
Recommended
torque is 80%
of bolts maximum
yield shown in
ft./lbs.		 National Thread Bolt Diameter In Inches
1/4 5/16 3/8 7/16 ½ 9/16 5/8 3/4 7/8 1 1 1/8 1 1/4 1 3/8 1 ½
Fine 13 25 46 73 112 160 224 392 624 928 1348 1878 2531 3320
Course 11 23 42 65 99 143 198 351 566 848 1202 1696 2223 2951

OEM and MRO Non-Standard Gaskets
Please call our technicians with your non-standard gasket application data to ensure there is sufficient gasket stress to
affect a seal. Torque formulas are available if you choose to do the necessary calculations yourself.

 
 
 
 
 
 
 
 
 
 
 
 
 
Phelps Industrial Products, Inc., 6300 Washington Boulevard, Elkridge, Maryland 21075-5397