Leaders in Corrosion Management & 

Sealing Technology 

Petrolatum Tapes 

DENSO PETROLATUM TAPE
 SYSTEMS

Components

• A - Denso Paste S105 (T)    
   

• B - Denso Mastic

• B - Densyl Mastic (T)  
   

• C - Denso Tape

• C - Densyl Tape (T)  

• C - Denso Marine Piling Tape (T)
   

• D - Denso PVC Self Adhesive Tape

Instructions for Use

(A = Primer, B = Profiling, C = Tape, D = Overwrapping Tape)      (T = Tropical version)

USE:

For the protection of pipes, fittings and similar structures from corrosion above ground, buried or immersed. To protect the metal structures from the environment the tapes must cover the entire surface.
 

SURFACE
PREPARATION:

Surface must be clean and dry. Remove all loose rust, scale and flaking coatings by scraping, wire brushing or blast cleaning. 

 

A - PRIMING:

(Denso Paste S105)

For small diameter pipes and fittings (e.g. service pipes) apply DENSO PASTE S105 by gloved hand in a thin layer over the entire surface including threads, crevices and pitted areas.

 

B - PROFILING:

(Densyl Mastic)

For molding around irregular profiles such as flanges, valves and couplings to provide a suitable contour for wrapping with tape.

See examples
Application...

Valves, Flanges and Couplings
After the primer has been applied press DENSYL MASTIC into cavities, into angles to form a fillet and around bolt heads to form a rounded profile suitable for wrapping with tape without forming bridges or voids.

Ducts, Sleeves and Service Entries
For duct or sleeve sealing do not use primer. Pack DENSYL MASTIC by hand into the annular space between the cable or service pipe and the duct or sleeve pipe. Force the mastic into the gap to a depth at least equal to the diameter of the sleeve or duct. Smooth the exposed surfaces and ensure that interstices between pipes or cables are properly sealed.
 

C - WRAPPING:

(Densyl Tape / Denso Marine Piling Tape)
 

(a) Pipes, Rods and Cables   

Select as wide width of tape as practical, e.g. 75 mm wide for 75 mm diameter pipe. For buried or immersed applications apply tapes with 55% overlap to give double thickness.

For above ground use overlap tapes by 15mm for widths up to 150 mm and 25 mm for wider tapes. Press the end of the tape firmly onto the pipe and unroll the tape around the pipe spirally, overlapping itself (see diagram). Apply sufficient tension to conform the tape to the surface without gaps. Do not overstretch.  

Start a new roll by overlapping the end by one tape width. Press down all folds and smooth the entire area with special attention to overlaps.
 

See examples
Application...

(b) Butt Welded Joints

As (a) but apply one circumferential turn around the pipe with half the tape width covering the existing pipe coating and half on the bare joint area. Continue to apply the tape spirally with 55% overlap across the joint area until it overlaps the existing pipe coating by half its width. Complete the wrapping with one circumferential turn.
 

See examples
Application...

(c) Flanges, Valves, Elbows, etc.

Carefully bandage the fitting, pressing down folds and avoiding air gaps. Cover the whole fitting with at least two layers continuing onto the pipe coating either side.

At large changes of diameter, bolts and internal angles, make the profile more suitable for wrapping by applying DENSYL MASTIC as a fillet at angles and around bolts. (See Filling Section) Wrap the profiled joint as above ensuring the tape does not bridge.
 

See examples
Application...

(d) Coating Repairs 

Cut away and remove loose coating from the damaged area and smooth or chamfer edges. Prime the exposed metal with DENSO PASTE S105.  Wrap the section of pipe as (a) continuing at least 50 mm either side of the damage area.
 

D - OVER-WRAPPING:

(Denso PVC Self Adhesive Tape)

For further protection, a separate overwrap of DENSO PVC SELF ADHESIVE TAPE, may be applied spirally over the petrolatum tape. Consult our Technical Sales Department for advice on selection and application of overwraps.

 

INSPECTION:  

Ensure that the entire surface is covered with no gaps or air pockets. DENSYL TAPE and DENSO MARINE PILING TAPE cannot "holiday" tested due to soft surface.
 

Check out  'The Proof is in the Testing'

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