FireNut - Trelleborg Applied Technologies

FireNut™

Wherever hydrocarbons are transported, the pipes are flanged are held together with nuts and bolts. In case of fire, the flanges and pipes should maintain the same level of integrity to avoid escalation. Traditional protection is to capsule the whole valve and flanges in a fire-insulated metal box - a bulky, heavy and expensive solution. The box also creates challenges during inspection and maintenance. Trelleborg has developed a jet fire protection for bolted connections to extend service life in the event of a fire. The easy to install FireNut resists both jet fire and pool fire and is tailor made to accommodate almost any bolt size. The rigid and tough design means that FireNut has extremely good resistance to mechanical damage when installed.

Tailored specifications

FireNut™ can be made to fit any shape and size to suit individual requirements.

High resistance

High abrasion, blast, impact, jet fire, ozone, UV, most solvents  and seawater resistant

Protection

Excellent HISC, corrosion, fire mechanical and wear protection

Key Applications

New bolts

New nuts

Old bolts

Old nuts

Technical specifications

Below are examples of FireNut assortments

  D, FireNut™ width
H1, FireNut™ height 
H2, nut height (casted nut, exceeding bolt)
H3, socket height
D2, socket diameter
T,
FireNut™ wall thickness 
             
                 
  D [mm] H1 [mm] H2 [mm] H3 [mm] D2 [mm] T [mm] Thread std. Thread size
 

50

57

15

12

17

16.5

ISO

M10

  50  57  21  12  21 14.5  ISO  M12 
  65  70  15  23  30  17.5  ISO M16 
  44  50  32  18  26  UNC  1/2"
  46  60  30  20  34  6 UNC  5/8" 
  50  57  30  20  38 UNC  3/4" 
  57  65  30  25  44  6.5  UNC  7/8" 
  66  70 30 30  53  6.5  UN8  1 1/8" 
  74  80  30  35  60  UN8  1 1/4" 
  85  80  30  40  72  6.5  UN8  1 1/2" 
  105  95  30  55  93  UN8  2" 
  150  120  30  80  137  6.5  UN8  3" 
  68  78  45  33
53  7.5  UN8  1 1/8" 
Product sheet
Trelleborg Offshore Firenut

FireNut


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