Pressure Testing



Plasti-Seal Corporation, which has grown in a few years to a position of leadership in impregnation metal castings, has applied its technical skills and know-how to the field of pressure testing with ever increasing success. The two services complement each other perfectly, particularly in light of the economies realized when the combination of impregnation and testing occurs in one stop under the same roof. But our testing service goes far beyond the spot testing and the 100% testing that we do in conjunction with impregnating.

We are equipped to carry out most types of pressure testing in our plant. The largest portion of pressure testing called for falls into the pneumatic and hydraulic categories. In addition to this we perform vacuum testing, flow testing, equipment testing, and tests involving pressures at varying temperatures. All work conforms to generally approved standards.

We are equipped to develop extreme pressure (high and low) both pneumatically and hydraulically as well as extreme vacuums. Our equipment is capable of delivering more pressure than ever required in testing.

Our experienced staff skillfully engineers the necessary fixtures and set-ups required for testing and is readily available for consultations on any technical problem that arises in connection with pressure testing.

Our government-approved procedures insure that all work completed follows government specifications. Certificates of compliance will be issued whenever they are requested and government source inspection can be arranged.

We calibrate all measuring devices, meters and gauges regularly with specifications stated in our Quality Control Manual and these records are available for inspection. All testing conforms to the standards set forth in this Quality Control Manual, copies of which are obtainable upon request.

PNEUMATIC (AEROSTATIC) PRESSURE TESTING employs the use of air, nitrogen, helium or any other not highly combustible gases. The most common technique is proof-pressure testing a casting, is to seal all of openings from castings except one; an air pressure line head goes over the remaining openings, and a close seal results. The unit is then lowered into a water tank and air at a specific pressure, monitored by a pressure regulator, is admitted to the casting. The presence of air bubbles rising for the point of the leak shows any loss pressure

We use numerous methods for sealing the exits in the casting depending on the nature of the part being tested including rubber plugs, clamps, and metal plates.

On quantity testing operations, we custom-make air operated sealing fixtures. With small parts, we frequently test a number of them simultaneously on semi-automatic equipment, which results in high-speed, low-cost testing. Plasti-Seal Corporation owns a large variety of specialized testing equipment of this kind, much of it developed in our own plant.

Items too large for emersion are tested by sealing all exits except one, admitting air under pressure and then examining the surface with the aid of a soapy water solution.

HYDRAULIC (HYDROSTATIC) PRESSURE TESTING utilizes liquids applied either internally or externally under pressure. Water, oil, hydraulic fluids or almost any liquid can be specified. Hydraulic testing allows much higher pressure than pneumatic without danger. Hydrostatic pumps serve in place of pneumatic pumps and two exits remain unsealed instead of one. In one opening the liquid is applied under pressure while in the other the air is displaced as the liquid enters. When all the air leaves, the second opening is sealed. The use of colored liquids aids greatly in locating leaks.

VACUUM TESTING by Plasti-Seal is performed to very close tolerances. In vacuum testing all but one of the openings are sealed and a vacuum pump evacuates air to the desired point. After shutting off the pump any resulting drop-off in the reading is noted. With our electronic gauge we perform readings in the micron range. Since vacuum testing employs much of the same equipment used in impregnation, we are well equipped in this area.

OTHER TESTING SERVICES utilize pneumatic and vacuum equipment:

FLOW TESTING is accomplished by the use of flow meters while we pump air or any nonflammable gas or liquid through the unit being tested at an evenly controlled pressure according to the specifications. We are prepared to do all kinds of flow testing. Liquids are flow tested using the hydraulic pumps. No meters are required; the amount of liquid passing through in a given time is simply measured in a graduated flask.

EQUIPMENT TESTING is done on pressure actuated mechanical devices without pneumatic, hydraulic and vacuum equipment according to our customer’s specifications.

TEMPERATURE TESTING on parts maintained at specified high or low temperatures can be performed in conjunction with pneumatic or hydraulic testing. Foe pneumatic temperature testing, the testing liquid maintains the required temperature because of a heated element submerged in the liquid. For hydrostatic testing, the liquid pumped through the parts is heated. We have equipment to record the liquid temperatures on charts and can provide certifications and record charts to substantiate the test results.

TESTING EXPERIENCE covering a broad range of products is a result of Plasti-Seal Corporation’s growing testing activity over the years. Among the many parts tested are: housings, covers, vacuum chamber of electronic microscopes, aircraft and marine instruments, various electronic components; fire chambers for ejection seats and other aircraft equipment; canning, vending and other food handling equipment; torpedo covers and housings, 35-85-105-155 mm warheads and boosters, housings and nose cones of rockets, exhaust parts for the Atlas Missile and compressor heads for the freezing unit in missiles and the food industry; water meter castings, all types of valves, pipe and pipe fittings, gas meter housings, fuel tanks, filter casting bodies, engine block water jackets, cylinders, tubes, weldments, and other items too numerous to list.

FIELD SERVICE is available as an option when parts to be tested are too large or for other reasons are impractical to ship to our plant. We stress our willingness to perform services in the field and have developed a complete line of portable equipment for this purpose including portable hydraulic pumps and portable compressors. Bottled gases are used for pneumatic testing in the field.

CUSTOMERS find in our work more satisfactory than any other pressure testing service they have used. Our consistently high quality performance plus the broader range of services we offer puts us ahead of anyone else operating in this area. In addition, the combination of our know-how and efficiency give you a considerable price advantage. Frequently, customers find it less expensive when Plasti-Seal performs the two services of impregnation and testing than when they just do the testing in their own plant. Our customers grow with our reputation and they now cover a broad geographic area with projects from as far away as New England, Florida, and the West Coast.

0.240 M/M Mercury Column
0.36″ H2O Water Column
0.36.5 SCFM Air Flow
0.6 SCFM Air Flow
0.2740 C/C PM Air Flow & Fluid Flow
Hydraulic press-hand operated, 35 ton
Pneumatic Press-air operated 150 psi
Gas Oven with recording chart-temperature control 3’x 51/2′ x 61/2′ Max. Temperature 650 F
(2) Electric Ovens-temperature controlled 14″x 14″ x 20″ Max. temperatures 550 F
Air compressor-electric motor, 5 H.P. Max 150 psi
Gas compressor-air pressure-shop supply Max. 15,000 psi
(1) Hydraulic pump-hand operated Max. 60,000 psi
(2) Hydraulic pumps-electric motor 1 H. P. Max. 200 psi
(3) Hydraulic pumps-air pressure shop supply Max. 15,000psi
Electric motor 1 H. P. 1M/M hg.
Electric motor 1 H. P. 5 M/M hg.
Electric motor 1 H. P. Micron Range
Various Non-Flammable Gases
(1) Micron Gauge-electronic 5,000 -0 microns
(4) Vacuum gauge-dial 0.30″ vacuum
36″ dia. 40″ deep-press 100 psi
18 x 18 experimental 50 psi
Explosion chamber 50″ x 44″ x 45″ assorted press relief valves, face shields, eye glasses, etc.
Air and Hydraulic – calibrated every 6 months-ranges 0.75,000
Range from 0.1500
Ultra Violet Lamp
Various sizes to 5,000 psi
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    Plasti Seal Corporation
    1647 Republic Road
    Huntingdon Vly, PA 19006-1807
    (215) 355-4555