Proco Style GF-6201

The Proco Style GF-6201 flexible metal grooved pump connector has been designed to control a variety of mechanical stresses, such as:

  • Vibration control
  • Noise reduction
  • Relief from system stressors
  • Prevention of system shock
  • Compensation for misalignment and movement

Ordinary flexible metal hoses can fail to operate properly when subjected to high pressures; adding a flexible restraint, such as a metal braid, allows the hose to adequately withstand the specified internal pressure and prevent elongation. The woven metal braid is designed to fit over the metal hose, and to be strong enough to withstand elongation up to the full pressure rating of the hose.

Flexible hoses and braids can be made from a variety of different metals, to suit even the most diverse needs.

For more information about the features and benefits of the Proco Style GF-6201 flexible metal pump connector, download our brochure.

For up-to-date pricing and availability information, contact PROCO today.

Style GF-6201 Braided Flexible Metal Grooved Connector
Expansion Joint Size: ID X Length Stock Lateral Offset Working Press (PSI) Approx. Unit Ship Weight
Intermittent Permanent @ 70°F @ 300°F
2 x 12 S 1/8″ 3/8″ 450 396 10
2- 1/2 x 14 S 1/8″ 3/8″ 345 303 12
3 x 14 S 1/8″ 3/8″ 289 254 13
4 x 16 S 1/8″ 3/8″ 300 264 18
5 x 17 S 1/8″ 3/8″ 220 193 25
6 x 18 S 1/8″ 3/8″ 200 176 28
8 x 20 S 1/8″ 3/8″ 190 167 50
10 x 24 S 1/8″ 3/8″ 150 132 70
12 x 25 S 1/8″ 3/8″ 125 110 90

1. “S” Indicates stocked item.

Temp °F Material
Bronze 304 SS 321 SS
Ambient 1.00 1.00 1.00
150 .92 .96 .97
200 .89 .92 .94
250 .85 .91 .92
300 .83 .86 .88
350 .81 .85 .86
400 .78 .82 .83
450 .75 .80 .81
500   .77 .78
600   .73 .74
100   .69 .70
800   .64 .66
900   .58 .62
1000     .60
1100     .58
1200     .55
1300     .50
1400     .44
1500     .40

Temperature Correction Factors
1. Determine maximum operating temperature.
2. Locate appropriate correction factor above.
3. Multiply maximum working pressure by correction factor at temperature for acceptable rating.

Service temperature for a braided flexible metal pump connector has a negative affect on the amount of maximum pressure to which it can be subjected. The table above should be used to calculate the safe working pressure based on the elevated temperature the braided metal pump connector is operating under. (Working Pressure X Elevated Temperature Conversion Figure = Safe Working Pressure.)

Correct placement is essential to the proper functionality and lifespan of a flexible connector. For best results, place the Proco Style GF-6201 flexible connector adjacent to rotating equipment, in a straight line, without any offset, to help isolate the piping system from excessive vibration and noise.

Braided flexible metal connectors must be installed at or below the listed permanent lateral offset values listed in the Proco GF-6201 Brochure.

For more detailed information, download the PROCO Style GF-6201 Brochure.

The information in the table below is to be used as a guide for the proper selection of braided metal pump connector materials (both hose and braid), based on the chemicals used.

This data should not be construed as advice on which combination to use, or not use; final responsibility lies with the system designer or operator for correct material selection based on flow media.

It is suggested that you include flow media information on the “Connector Specification Data Sheet,” found at the back of the PROCO GF-6201 Brochure.

For more information, download the PROCO GF-6201 Brochure here.

Corrosion Rate:
A – RESISTANT•••••••••••••••••••••••••••••••••••••less than .00035 inch penetration per month.
B – PARTIALLY RESISTANT•••••••••••••••••0035 inch penetration per month.
C – NON RESISTANT••••••••••••••••••••••••••••greater than .0035 inch penetration per month.

Chemical Temp. °F. 304,321 S.S. Carbon Steel Bronze
 Acetic Acid 5%, 20% Agitated or Aerated  70°  A  C  C
      50% 70°  A  C  C
      50%. 80% Boiling  C  C  C
      80% 70°  A  C  C
      100% 70°  A  C  C
      100% Boiling  C  C  C
      100%-150 lbs. Pressure 400°  C  C  C
Acetic Acid Vapors, 30% Hot  C  C  C
      100% Hot  C  C  C
Acetyl Chloride Cold  B³  C  B
  Boiling  B³  C  B
Acetylene Concentrated 70°  A  A  C²
      Commercially Pure 70°  A  A  C²
Acid Salt Mixture        
      10% H2SO4 Sp. G. 1.07 + 2% FeSO4 Ο 5 H2O Boiling  A³, 4  C  C
Acid Salt Mixture        
      10% H2SO4Sp. G. 1.07+2% FeSO4 Ο 7 H2O Boiling  A³,4  C  C
Alcohol, Ethyl, 70° & Boiling 70°  A  A  A
Alcohol, Methyl 70°  A  A  A
  Boiling  C  C  A
Aluminum Acetate, Saturated 70°  A  C  C
  Boiling  A  C  C
Aluminum Chloride        
      10% Quiescent 70°  C  C  C
      25% Quiescent 70°  A³,4  C  C
Aluminum Fluoride 70° C  C  C
Aluminum Hydroxide, Saturated 70°  A  A4  A
Aluminum Sulphate, 5% 150°  A  C  C
      10% 70°  A  C  C
      10% Boiling  B  C  C
      Saturated 70°  A  C  C
      Saturated Boiling  B  C  C
Aluminum Potassium Sulphate:        
      (Alum) 2%-10% 70°  A  C  B
      10% Boiling  B  C  C
      Saturated Boiling  C  C  C
Ammonia (Anhydrous)        
      All Concentrations 70°  A  A  A
      Gas Hot  C  C  C
Ammonia Liquor 70°  A  C  C
  Boiling  A  C  C
Ammonium Bicarbonate 70°  A  C  C
  Hot  A  C  C
Ammonium Bromide 70°  B  C  C
Ammonium Carbonate 1% & 5% 70°  A  A  C
Ammonium Chloride 1% 70°  A³,4  B  C
      10% Boiling  A³,4  C  C
      28% Boiling  B³,4  C  C
      50% Boiling  B³,4  C  C
Ammonium Hydroxide: All Concentrations 70°  A  B  C
Ammonium Monophosphate 70°  A  B  C
Ammonium Nitrate:        
      All Concentrate Agitated 70°  A  C  C²
      All Concentrate Aerated 70°  A  C  C²
      All Concentrate Saturated Boiling  A  C  C²
Ammonium Perchlorate 10% Boiling  A³,4  B  C
Ammonium Persulphate 5% 70°  A  C  C
Ammonium Phosphate 5% 70°  A  B  C
Ammonium Sulphate        
      1% Aerated or Agitated 70°  A  C  C
      5% Aerated & Agitated 70°  A  C  C
      10% & Saturated Boiling  B4  C  C
Ammonium Sulphate, 70% Boiling 70°  A  C  C
Barium Carbonate 70°  A  B  A
Barium Chloride 5% & Saturated 70°  A3,4  C  B
Barium Hydroxide Aqueous Solution Hot  A  B  A
Barium Nitrate Aqueous Solution Hot  A  B  
Barium Sulphate 70°  A    A
Barium Sulphide Saturated Solution 70°  A  C  C
Beer (Barley, Malt, &Hops) 70°  A  C  A
      3.5% – 4.5% Alcohol 160°  A  C  A
 Benzene (Benzol) 70° or Hot  70°  A  B  A
 Benzoic Acid  70°  A  A  A
 Borax 5%  Hot  A  B  A
Boric Acid        
      5% Solution, 70° or Hot 70°  A  C  A
      5% Solution Boiling  A  C  A
      Saturated Solution 70°  A3,4  C  B
      Saturated Solution Boiling  A3,4  C  C
Bromine Water 70°  C  C  C
Butyl Acetate    A  B  
Calcium Chloride Dilute or Concen. Solution 70°  B3,4  C  B
Calcium Chlorohypochlorite        
      (Bleaching Powder) 1% 70°  C  C  B
      (Bleaching Powder) 5% 70°  C  C  B
Calcium Hypochlorite, 2% 70°  B4  C  B
Calcium Hydroxide, 10-20% Boiling  A  C  A
Calcium Sulphate, Saturated 70°  A  C  A
Carbonic Acid Saturated Solution 70°  A  C  A
Carbolic Acid  70°  A  C  B
Carbolic Acid  Boiling  A  C  B
Carbon Bisulfide  70°  A  B  B
Carbon Monoxide Gas  1400°  A  A  C
Carbon Monoxide Gas  14390°  A  A  C
Carbon Tetrachloride        
      Commercially Pure  70°  A3,4  B  A
      Dry Commercially Pure  Boiling  A3,4  B  A
      Commercial + 1% Water    C  C  B
Chloracetic Acid  70°  C  C  B
Chlorbenzol Concentrate Pure Dry  70°  A  B  B
Chloric Acid  70°  C  C  C
Chlorine Gas (Dry)  70°  C  B  A
      (Moist)  70°  C  C  C
Chlorinated Water, Saturated    C  C  
Chloroform  70°  A  A  A
Chromic Acid        
      5% Commercially Pure  70°  A  C  C
       10%  70°  C  C  C
 Chromic Acid        
       10% Commercially Pure  Boiling  C  C  C
      50% Commercially Pure  70°  C  C  C
      50% Commercially Pure  Boiling  C  C  C
      Commercial 50% (Cont. SO3)  70°  C  C  C
      Commercial 50% (Cont. SO3)  Boiling  C  C  C
Chromium Plating Bath  70°  A  B  C
Citric Acid 5% Still  70°-150°  A  C  A
      15% Still  70°  A  C  B
      15% or Concentrated  Boiling  B  C  B
Coffee RSC  Boiling  A  C  A
Copper Acetate (Saturated Solution)  70°  A  C  
Copper Carbonate (Sat. Sol.) in 442% NH4OH    A    C
Copper Chloride,        
      1% Agitated  70°  B3,4  C  C
      1% Aerated  70°  B3,4  C  C
       5% Agitated  70°  C  C  C
       5% Aerated  70°  C  C  C
Copper Cyanide (Saturated Solution)  Boiling  A  C  C
Copper Nitrate        
      1% Still, Agitated & Aerated  70°  A  C C
      5% Still, Agitated & Aerated  70°  A  C  C
       50% Aqueous Solution  Hot  A  C  C
Copper Sulphate        
      5% Agitated Still or Aerated  70°  A  C  B
      Saturated Solution  Boiling  A  C  B
Cresote (Cool Tar) Hot A B A
Creosote Oil  Hot  A  B  B
Dichloroethane (Dry)  Boiling  A  C  C
Dyewood Liquor  70°  A1  C  
Epsom Salt (Magnesium Solution)  Hot & Cold  A3,4  C  A
Ethyl Acetate (Concentrated Solution)  70°  A  B  A
Ethyl Chloride  70° A3,4  B  B
Ethylene Chloride  70°  A3,4  B  B
Ethylene Glycol  70°  A  B  A
Ferric Chloride        
       1% Solution Still  70°  B3,4  C  C
      1% Solution  Boiling  C  C  C
      5% Solution, Agitated, Aerated  70°  C  C  C
Ferric Hydroxide    A  C  
Ferric Nitrate        
      1-5% Quiescent or Agitated  70°  A  C  C
      1-5% Aerated  70°  A  C  C
 Ferric Sulphate        
      1-5% Quiescent or Agitated  70°  A4  C  C
      1-5% Aerated  70°  A4  C  C
       10%  Boiling  A4  C  C
Ferrous Chloride: Saturated Solution  70°  C  C  B
Ferrous Sulphate: Dilute Solution  70°  A  C  B
Fluorine (Gas) Moist  70°  C  C  C
Formaldehyde 40% Solution    A4  B  A
Formic Acid, 5% Still  70°  B  C  B
 5% Still  150°  B  C  B
Fuel Oil  Hot  A  B  A
      Containing Sulphuric Acid    C  C  C
Gallic Acid, 5%  70°-150°  A  C  
      Saturated  212°  A  C  
 Gasoline  70°  A  B  A
 Hydrochloric Acid: All Concentrations  70°  C  C  C


Chemical Temp. °F. 304,321 S.S. Carbon Steel Bronze
 Hydrocyanic Acid 70°  A  C  C
 Hydrofluric Acid 70°  C  C  C
 Hydrofluosilic Acid  70°  C  C  B
 Hydrogen Sulphide (Dry)  70°  A  B  A
       (Wet)  70°  B1  C  C
 Hyposulphite Soda    A  C  
 Iodine  70°  C  C  C
 Kerosene  70°  A  B  A
 Ketchup, Quiescent  70°-150°  A4  C  
 Lactic, Acid 1%  70°  A  C  B
       1%  Boiling  A  C  C
       5%  70°  A  C  B
       5%  Boiling  B  C  C
       10%  70°  B  C  B
       10%  Boiling  C  C  C
       Concentrated  70°  B  C  B
       Concentrated  Boiling  C  C  C
 Lead Acetate 5%  Boiling  A  C  
 Linseed Oil  70°  A  B  B
 Plus 3% H2SO4  390°  B  C  C
 Magnesium Chloride        
       1% Quiescent  70°  A3,4  C  B
       1% Quiescent  Hot  C  C  B
       5% Quiescent  70°  A3,4  C  B
       5% Quiescent  Hot  C  C  B
 Magnesium Oxychloride  70°  C  C  
 Magnesium Sulphate  Hot & Cold  A  C  A
 Malic Acid  Hot & Cold  B  C  
 Mercuric Chloride Dilute Solution  70°  C  C  C
 Methanol (Methyl Alcohol)    A  B  A
 Mixed Acids 53% H2SO4+45% HNO3  Cold  A  C  C
 Muriatic Acid  70°  C  C  C
 Naphtha, Crude  70°  A  B  B
 Naphtha, Pure  70°  A  B  B
 Naphthalene Sulfonic Solution  70°  A  C  
 Nickel Chloride Solution  70°  A3,4  C  B
 Nitrating Solution  Cold & Hot  B    B
 Nickel Sulphate  Cold & Hot  A  C  A
 Nitric Acid        
       5%-442%-70%  Boiling  A  C  C
       65%  70°  A  C  C
       65%  Boiling  B  C  C
       Concentrated  70°  A  C  C
       Concentrated  Boiling  C  C  C
       Fuming Concentrated  70°-110°  A  C  C
       Fuming Concentrated  Boiling  C  C  C
 Nitrous Acid 5%  70°  A  C  C
 Oils, Crude  Cold & Hot  A1    
 Oleic Acid  70°-400°  A4  B  B
       5%-10%  70° & Boiling  A  C  B
       10%  Boiling  C  C  B
       25%-50%  Boiling  C  C  B
 Phenol (See Carbolic Acid)        
 Petroleum Ether    A  B  
 Phosphoric Acid        
       1%  70°  A  C  C
       1%  Boiling  A  C  C
       1%-45 lbs. Pressure  284°  A  C  C
       5% Quiescent or Agitated  70°  A  C  C
       5% Aerated  70°  A  C  C
       10% Quiescent  70°  C  C  C
       10% Agitated or Aerated  70°  C  C  C
       10%-50%  Boiling  A  C  C
       80%  70°  C  C  C
       80%  230°  C  C  C
       85%  Boiling  C  C  C
 Pictic Acid  70°  A  C  C
 Potassium Bichromate, 25%  70°  A  C  C
       25%  Boiling  A    C
 Potassium Bromide  70°  B4  C  B
 Potassium Carbonate 1%  70°  A  B  B
 Potassium Carbonate  Hot  A  B  C
 Potassium Chlorate: Saturated at 212°  Boiling  A3  B  C
 Potassium Chloride        
       1% Quiescent  70°  A3,4  C  B
       1% Agitated or Aerated  70°  A3  C  B
       5% Quiescent  70°  A3,4  C  B
       5% Agitated or Aerated  70°  A3  C  B
       5%  Boiling  A3  C  B
 Potassium Chromium Sulphate, 5%  70°  A4  C  B
       Sp. G. 1.6  Boiling  C  C  C
 Potassium Cyanide  70°  A  B  C
Potassium Ferricyanide, 5%-25% 70° A C  
      25% Boiling A C  
Potassium Ferrocyanide, 5% 70° A C  
Potassium Hydroxide, 5% 70° A C B
      27% Boiling A C B
      50% Boiling B C C
Potassium Hypochlorite 70° B C C
Potassium Nitrate        
      1%-5% Still or Agitated 70° A C B
      1%-5% Aerated 70° A C B
      50% 70° A C B
      50% Boiling A C  
Potassium Permanganate, 5% 70° A B  
Potassium Sulphate        
      1%-5% Still or Agitated 70° A B  
      1%-5% Aerated 70° A B A
Potassium Sulphide (Salt)   A3,4 C  
Sea Water 70° A3,4 C B
Sewage   A   A
Silver Bromide   B4 C C
Silver Chloride   C3,4 C C
Silver Nitrate   A C C
Sodium Acetate (Moist)   A4 C  
Sodium Bicarbonate        
      All Concentrations 70° A C B
      5% 1442° A C B
Sodium Bisulphate, Solution 70° A C B
Saturated Solution 70° C C B
2g.+1g. H2SO4 liter 68° C C B
Sodium Carbonate, 5% 70°-150° A3,4 B B
       5%-50%  Boiling  A3,4  B  B
 Sodium Chloride, 5% Still  70°-150°  A3,4  C  B
      20% Aerated 70° A3,4 C B
       Saturated 70° A3,4 C B
      Saturated Boiling B3,4 C B
Sodium Cyanide 70° A3,4 B C
Sodium Fluoride, 5% Solution 70° B3,4 C A
Sodium Hydroxide 70° A3,4 B B
Sodium Hydroxide, 5% Still    B3.4 B B
Sodium Nitrate Fused A3,4 B A
Sodium Phosphate 70° A3,4 B B
Sodium Sulphate, 5% Still 70° A3,4 C A
      All Concentrations 70° C C A
Sodium Sulphide, Saturated   B3,4 C  
Sodium Sulphite,5% 70° A3,4 C B
      10% 150° A3,4 C B
Sodium Thiosulphate        
      Saturated Solution 70° A3,4 C C
      Acid Fixing Bath (Hypo) 70° A3,4 C C
      25% Solution 70° & Boiling A3,4 C C
Sulphur, Moist 70° B3,4 C C
Sulphur Chloride (Dry)   C3,4 C A
Sulphur Dioxide Gas (Moist) 70° B3,4 C B
Gas (Dry) 575° A3,4 C A
Sulphuric Acid        
      5%-10% 70° C C B
      5%-10% Boiling C C C
      50% 70° C C C
      50% Boiling C C C
      Concentrated 70° A3,4 C B
      Concentrated Boiling C C B
      Concentrated 300° C C B
      Fuming 70° C C B
 Sulphurous Acid, Saturated  70°  C  C  B
       Saturated- 60 lbs. Pressure  250°  C  C  B
       Saturated-70-125 lbs.  310°  C  C  B
      1442 lbs. Pressure 375° C C B
Sulphurous Spray 70° C C C
Tannic Acid 70° A C A
  150° A   A
Tartaric Acid, 10% 70° A C A
      10%-50% Boiling B C A
Trichloracetic Acid 70° C C B
Trichlorethylene (Dry) 70° A4 C A
      (Moist)       B
Water   A B A
Zinc Chloride, 5% Still 70° A3,4 C C
  Boiling B3,4 C C
Zinc Cyanide (Moist) 70° A C  
Zinc Nitrate, Solution Hot A C  
Zinc Sulphate, 5% 70° A C B
      25% Boiling A C B
      Saturated 70° A C B

The media listed herein is considered to be  to pure at room temperature and unless otherwise specified dry. A change in condition can affect the ratings listed above. It should be noted that this reference table is only a partial listing for corrosion evaluation.

1. Erosion••••••••••••••••••••••••••••••••••••• subject to attack in the presence of H2So4.
2. Unstable••••••••••••••••••••••••••••••••••••• may cause explosive reaction.
3. Chloride Stress Corrosion Cracking••••••••••••••••••••• chlorides acting on anstenetic stainless steel (i.e. T-304 & T-321) can cause cracking in hose.
4. Pitting Corrosion••••••••••••••••••••••••••••• galvanic action can cause holes to form in hose (usually from acids when combined with air mixtures or when allowed to dry).