Cross section of spiral wound boiler manhole and handhole gaskets, and a B&W #28  Handhole Plate.

Standard Spiral Wound gaskets- made with an alternating combination of formed metal wire and soft filler materials- are available to fit most boiler inspection plates. Boiler handhole and tubecap assembly gaskets are available in thicknesses of .125" (special) and .175" (standard). The maximum operating pressure should be specified when ordering these gaskets.

Key Benefits

• Durable and easy to install
• Constructed to fit plate snuggly
• Withstand highest temperatures and pressures 
• Most common sizes shipped from stock

Sizing by Boiler Manufacturer

Boiler Handhole and Tubecap Gasket Sizes by Boiler Manufacturer

Babcock and Wilcox

     #24        4-1/2 x 5-1/2 x 7/32 x.175         Oval
     #28        4-13/16 x 5 x 7/32 x .175          Rectangle
     #40        3-3/8 x 3-3/4 x 3/16 x .175        Diamond
     #48        3-13/16 x 4-3/4 x 7/32 x .175      Oval

Cleaver-Brooks

                3-9/32 x 4-17/32 x 3/8 x .175       Obround

Combustion Engineering
 

     #4N-L740           3-1/8 x 3-5/8 x .175         Round
     #4N-L741           3-3/8 x 3-7/8 x .175         Round
     #29                3-3/8 x 4-1/4 x 1/4 x .175   Oval
     #33                3-3/4 x 4-5/8 x 1/4 x .175   Oval

Foster Wheeler

     2-3/4 OB           2-25/32 x 3-13/32 x 7/32 x .175  Obround

Wickes

     Pear               4-1/8 x 5-1/8 x 9/32 x .175   Pear

Standard Handhole and  Tubecap Gasket Sizes

OVAL

     3 x 4 x 3/8 x .175
     3 x 4 x 1/2 x .175
     3-1/4 x 5 x 3/8 x .175
     3-1/2 x 4-1/2 x 9/32 x .175
     3-1/2 x 4-1/2 x 3/8 x .175
     3-1/2 x 4-1/2 x 1/2 x .175
     3 x 5 x 5/8 x .175
     4 x 6 x 5/16 x .175
     4 x 6 x 3/8 x .175
     4 x 6 x 1/2 x .175
    

OBROUND

     3 x 4-1/2 x 3/8 x .175 
     3-5/8 x 5-1/2 x 1/2 x .175

Standard Manway Gasket Sizes  

      OVAL

     11 x 15 x 1 x .175
     12 x 16 x 3/4 x .175
     12 x 16 x 1 x .175
     12 x 16 x 1-1/4 x .175
     12 x 16 x 1-1/4 x .250

     ROUND

     16-1/16 x 17-9/16 x .175