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HOSE & COUPLING SAFETY

Hose and Coupling Safety

Some Common Problems...

Clamps are Bottomed-Out
The individual body sections of bolt style clamps should never be allowed to come in contact with each other; use the correct clamp for your hose's outside diameter.
Bolt Style Clamps
are Bottomed Out
Clamp Buckles are In-Line
The buckles of band clamps should be offset to eliminate the possibility of a straight line "leak path".
Clamp Buckles
are In-Line
Missing Bolts on Clamps
The bolts supplied with bolt style clamps are a designed part of the overall usability and function of the clamp. Make sure to use only the bolts supplied with the clamp; they are a special style.
Missing Bolts
on Clamps
Dust Plug Usage
The use of dust plugs and caps helps to keep contaminants out of lines, prevents environmental damage and keeps the gaskets properly in place.
Hoses without
Dust Plugs or Caps
Damaged Cam & Groove Handles
The handles supplied with cam & groove fittings are durable, but not indestructible. Missing or damaged parts must be replaced.
Cam Fitting
with Broken Handle
Missing Safety Clips
The use of a safety type retainer is necessary to assure that the universal couplings will not accidentally disconnect.
Missing
Safety Clips
Common Pipe Nipples
Industrial hose should be coupled with properly "barbed" or "serrated" hose stems. Hose should never be slid onto standard pipe.
Pipe Nipples Being
Used as Hose Barbs
Horizontal Outlets
A hard piped outlet horizontal to the floor is very dangerous, inefficient and causes undue stress on the hose. The use of angled adapters is strongly recommended.
Horizontal
Outlets

The very properties that make compressed gases useful in almost every area of modern life can also make them dangerous when mishandled. Years of experience with compressed gases have led to practices and equipment which, if employed, result in complete safety.
From the "Handbook of Compressed Gases"


Our hose couplings have been carefully engineered to meet specific requirements with large safety margins. If hose or couplings are not used in correct applications or are incorrectly applied, accidents and downtime can result. It is up to the end user to inform us of the application and pressures involved when ordering hose assemblies, and it is up to us to supply the right hose and coupling for that application. When in doubt, we are here to help you with the proper hose and coupling recommendation.
 
1. Air Hose Couplings -
This form of energy can be one of the most dangerous because it is used in so many applications and, when mishandled, can have more serious results than fluids. Air, as a gas, is compressible (fluids press only against the hose or vessel walls and lose little volume under pressure). When pressurized air releases suddenly, it does so with explosive force and can cause rapid hose whip, which can do serious physical harm to personnel or damage to nearby objects. This is why the selection of proper hose and couplings for air lines is so important, along with their proper installation and maintenance. Never take for granted that a coupling is installed properly or a clamp fully tightened on an air hose - check it regularly and use safety devices (see paragraph 4 below).
 
2. Steam & Gas -
The same rules apply for steam and gas, but, because these are inherently more hazardous materials, personnel tend to treat hose and couplings on these lines with more respect and care. Checking clamp tightness is very important with steam hose, where it is not unusual for clamps to loosen in service, in which case they must be retightened! Safety devices should also be used (see paragraph 4 below).
 
3. Fluid Hose Couplings -
Again, nothing should be taken for granted - in particular, check clamps for tightness each time the lines are used - especially when petroleum products or other hazardous liquids are involved. Large diameter hose, when suspended, can also be quite dangerous if it drops unexpectedly due to a coupling "pull-out" or sudden disconnection. A heavy fitting or clamp, plus the weight of the hose itself falling from any significant height, can cause injuries or damage. Be sure to use safety devices (see paragraph 4 below).
 
4. All Hose Assemblies -
All hose assemblies should be treated with respect as potential hazards. Worn-out fittings should be replaced. Retaining devices such as clips, cables or chains should be used. Clamps should be checked regularly. Under no circumstances should any coupling be disconnected while under pressure, unless the coupling is specifically designed to do so. Disconnecting couplings under pressure could result in serious injury or death, and destruction of property and equipment.


General Safety Information

Pressure Ratings
Pressure ratings for couplings, as stated on this web site, are based upon ambient temperature (70ºF) applications with true hose I. D., new couplings, new clamps, new quality hose and proper installation by a qualified assembler using the proper procedures and equipment. In addition, temperature can affect coupling retention. For temperatures other than ambient (70ºF) contact the Tampa Rubber Customer Service Department.
 
Product Selection
Many of the products on this web site are used in hose assemblies in a variety of applications. The safety of any hose assembly rests on the proper selection, installation, testing and use of each product. The safe use of any product on this web site is dependent upon the correct selection of the hose, fittings and method of attachment. To ensure such a proper selection, the user must inform us of the application and pressure involved when ordering hose assemblies. The use of S.T.A.M.P.E.D. (Size, Temperature, Application, Media, Pressure, Ends, Details) will help in the proper selection of hose assembly components. The selection of couplings and clamping devices is the responsibility of the purchaser or user, based upon our recommendations. If the purchaser or user is uncertain about the use or application of a product, we stand ready to provide information, including test results (if available), coupling and clamping recommendations and other data to help resolve these matters.
 
Installation
To achieve a safe and reliable assembly, proper installation procedures must be followed. Each component of the assembly has a part in determining these procedures. The purchaser or user must follow proper procedures. In the purchaser or user has any questions regarding installation, please contact the Tampa Rubber Customer Service Department.
 
Testing
We recommend that all hose assemblies be tested in accordance with the hose manufacturer's recommendations.
 
Re-Testing and Inspection
We recommend inspection and re-testing of hose assemblies on a regular and consistent basis in accordance with the hose manufacturer's recommendations. The application determines the regularity of the inspection and re-testing schedule. Any worn-out fittings, damaged hoses or missing safety devices should be replaced immediately. Bolt-style clamps must be checked and retightened on a regular and consistent basis.


S. T. A. M. P. E. D.

When specifying hose assemblies, please answer the following questions:

Size:What is the I. D. (inside diameter) of the hose? What is the O. D. (outside diameter) of both ends of the hose? What is the overall length required?
Temperature:What is the temperature range of the media (product) that is flowing through the hose assembly? What is the temperature range of the environment that surrounds the outside of the hose assembly?
Application:How is the hose assembly actually being used? Is it a pressure application? Is it a vacuum (suction) application? Is it a gravity flow application? Are there any special requirements that the hose assembly is expected to perform? Is the hose being used in a horizontal or vertical position? Are there any pulsations or vibrations acting on the hose assembly?
Media:What is the media / material that is flowing through the hose assembly? Being specific is critical. Check for: abrasive materials, chemical compatibility, etc.
Pressure:What is the maximum pressure including surges (or, maximum vacuum) that this hose assembly will be subjected to? Always rate the maximum working pressure of you hose assembly by the lowest rated component in the system?
Ends:What couplings have been requested by the user? Are they the proper fittings for the application and hose selected?
Details:Almost every hose application is unique. Are there any special details about your application that might affect the assembly? Examples would be amount of flexing, pull on the end fittings, twisting, external abuse possibilities, etc. All of this information will help us get you the right assembly for your specific application!


MSHA (Mine Safety and Health Administration) Regulations

30 CFR Sections 56.13021 and 57.13021
Except where automatic shut-off valves are used, safety chains or other suitable locking devices shall be used at connections to machines of high pressure hose lines of ¾" inside diameter or larger, and between high pressure hose lines of ¾" inside diameter or larger, where a connection failure would create a hazard.
 
30 CFR Section 75.1730
(e)
Safety chains, suitable locking devices, or automatic cut-off valves shall be used at connections to machines of high pressure lines of ¾ of an inch inside diameter or larger, and between high pressure hose lines of ¾ of an inch inside diameter or larger, where a connection failure would create a hazard. For purposes of this paragraph, high pressure means pressure of 100 PSI or more.
 
30 CFR Section 77.412
(d)
Safety chains or suitable locking devices shall be used at connections to machines of high pressure hose lines of 1 inch inside diameter or larger, and between high pressure hose lines of 1 inch inside diameter or larger, where a connection failure would create a hazard.


OSHA Regulations

Standards - 29 CFR, 1910.242 (partial):
(b)
Compressed air used for cleaning - Compressed air shall not be used for cleaning purposes except where reduced to less than 30 PSI and then only with effective chip guarding and personal protective equipment.
 
Standards 29 CFR, 1915.131 (partial)
(e)
Before use, pneumatic tools shall be secured to the extension hose or whip by some positive means to prevent the tool from becoming accidentally disconnected from the whip.
 
Standards 29 CFR, 1926.302 (partial)
(b)(1)
Pneumatic power tools shall be secured to the hose or whip by some positive means to prevent the tool from becoming accidentally disconnected.
(b)(2) Safety clips or retainers shall be securely installed and maintained on pneumatic impact (percussion) tools to prevent attachments from being accidentally expelled.
(b)(3) All pneumatically driven nailers, staplers and other similar equipment provided with automatic fastener feed, which operate at more than 100 PSI pressure at the tool shall have a safety device on the muzzle to prevent the tool from ejecting fasteners, unless the muzzle is in contact with the work surface.
(b)(4) Compressed air shall not be used for cleaning purposes except where reduced to 30 PSI and then only with effective chip guarding and personal protective equipment which meets the requirements of Subpart E of this part. The 30 PSI requirement does not apply for concrete form, mill scale and similar cleaning purposes.
(b)(5) The manufacturer's safe operating pressure for hoses, pipes, valves, filters and other fittings shall not be exceeded.
(b)(6) The use of hoses for hoisting or lowering tools shall not be permitted.
(b)(7) All hoses exceeding ½" inside diameter shall have a safety device at the source of supply or branch line to reduce pressure in case of hose failure.
 
Standards - 29 CFR, 1926.306
(a)
"General requirements"
(a)(1) "Application." This section applies to compressed air receivers, and other equipment used in providing and utilizing compressed air for performing operations such as cleaning, drilling, hoisting and chipping. On the other hand, however, this section does not deal with the special problems created by using compressed air to convey materials nor the problems created when men work in compressed air as in tunnels and caissons. This section is not intended to apply to compressed air machinery and equipment used on transportation vehicles such as steam railroad cars, electric railway cars and automotive equipment.
(a)(2) "New and existing equipment."
(a)(2)(i) All new air receivers installed after the effective date of these regulations shall be constructed in accordance with the 1968 edition of the A. S. M. E. Boiler and Pressure Vessel Code Section VIII.
(a)(2)(ii) All safety valves used shall be constructed, installed and maintained in accordance with the ASME Boiler and Pressure Vessel Code, Section VIII Edition 1968.
(b) 1926.306(b) "Installation and equipment requirements"
(b)(1) "Installation." Air receivers shall be so installed that all drains, handholes and manholes therein are easily accessible. Under no circumstances shall an air receiver be buried underground or located in an inaccessible place.
(b)(2) "Drains and trap." A drain pipe and valve shall be installed at the lowest point of every air receiver to provide for the removal of accumulated oil and water. Adequate automatic traps may be installed in addition to drain valves. The drain valve on the air receiver shall be opened and the receiver completely drained frequently and at such intervals as to prevent the accumulation of excessive amounts of liquid in the receiver.
(b)(3) "Gages and valves."
(b)(3)(i) Every air receiver shall be equipped with an indicating pressure gage (so located as to be readily visible) and with one or more spring-loaded safety valves. The total relieving capacity of such safety valves shall be such as to prevent pressure in the receiver from exceeding the maximum allowable working pressure of the receiver by more than 10 percent.
(b)(3)(ii) No valve of any type shall be placed between the air receiver and its safety valve or valves.
 
Standards - 29 CFR, 1926.603 (partial):
(a)(9)
Steam hose leading to a steam hammer or jet pipe shall be securely attached to the hammer with an adequate length of at least 1/4-inch diameter chain or cable to prevent whipping in the event the joint at the hammer is broken. Air hammer hoses shall be provided with the same protection as required for steam lines.
(a)(10) Safety chains, or equivalent means, shall be provided for each hose connection to prevent the line from thrashing around in case the coupling becomes disconnected.

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Tampa Rubber & Gasket Co., Inc.

215 North 20th Street
Tampa, FL, USA 33605
Ph-813-247-3647 Fax-813-247-3180
Toll Free-800-940-4673 E-Mail - The Post Office
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