GE GEI-M1011 Installation Instructions

GE Industrial Systems

Installation Instructions

Vertical Induction Motors

GEI-M1011A

High Thrust Hollow & Solid-Shaft and In-Line Solid-Shaft

Frames 182-5013 NEMA Type P Base TEFC

GEI-M1011A

Table of Contents

Page

Subject

I. General Information..........................................................................................................................................................3

A. How to Properly Use This Instruction Manual.............................................................................................................3

B. Safety Symbol Legend...............................................................................................................................................3

C. Safety Precautions......................................................................................................................................................4

D. Introduction...............................................................................................................................................................5

E. Description of Labels and Nameplates ........................................................................................................................5

F. Model and Serial Numbers .........................................................................................................................................5

II. Receiving, Handling and Storage.......................................................................................................................................5

A. Unpacking..................................................................................................................................................................6

III. Installation........................................................................................................................................................................6

A. Location and Mounting..............................................................................................................................................6

B. Pump and System Precautions .................................................................................................................................... 6

C. Alignment of Solid Shaft Motors ................................................................................................................................7

D. Couplings for Hollow Shaft Motors ............................................................................................................................7

1. General ...............................................................................................................................................................7

2. Self-Release Couplings........................................................................................................................................7

3. Bolted Couplings................................................................................................................................................. 8

4. Non-Reverse Couplings.......................................................................................................................................8

E. Power Supply and Connections...................................................................................................................................9

1. Wiring and Grounding.........................................................................................................................................9

2. Allowable Voltage and Frequency ..................................................................................................................... 10

3. Position of the Conduit Box............................................................................................................................... 10

F. Lubrication...............................................................................................................................................................10

G. Water Cooling..........................................................................................................................................................10

1. Oil Cooling Coil Connections............................................................................................................................10

IV. Operation........................................................................................................................................................................11

A. Steps Prior to Initial Start-Up After a Long Idle Period ............................................................................................. 11

B. Initial Start...............................................................................................................................................................12

C. Jogging and Repeat Starts.........................................................................................................................................12

V. Maintenance ................................................................................................................................................................... 12

A. General.................................................................................................................................................................... 12

B. General Cleanliness..................................................................................................................................................13

C. Coupling Maintenance.............................................................................................................................................. 13

D. Relubrication............................................................................................................................................................ 13

1. Oil Lubricated Bearings.....................................................................................................................................13

2. Grease Lubricated Bearings...............................................................................................................................14

E. End-Play Adjustment ...............................................................................................................................................15

1. General ............................................................................................................................................................. 15

2. Lower Thrust Bearings – 182-286 Frames, Grease Lubricated............................................................................ 15

3. Upper Ball Thrust Bearing – 324-5011 Frames, Oil Lubricated ..........................................................................15

4. End Play Adjustment – Spherical Roller Thrust Bearing.....................................................................................15

F. Bearing Replacement............................................................................................................................................... 16

G. Oil Cooling Coil Maintenance..................................................................................................................................16

H. Insulation and Winding Maintenance........................................................................................................................17

1. General ............................................................................................................................................................. 17

2. Vacuum and Compressed Air Cleaning..............................................................................................................17

3. Cleaning with Water and Detergent.................................................................................................................... 17

4. Cleaning with Solvents ...................................................................................................................................... 17

5. Revarnishing Windings..................................................................................................................................... 18

VI. Renewal Parts ................................................................................................................................................................. 18

VII. Trouble Shooting Chart ................................................................................................................................................... 19

GEI-M1011A

I. GENERAL INFORMATION

A. How to Properly Use This Instruction Manual

This manual has been written to assist the user with proper procedures when handling, installing, operating and maintaining the equipment. All of the safety warnings and instructions in this book must be followed to prevent injury to personnel.

The installation and maintenance manual must be kept for future reference during installation, operation and maintenance.

Below is a safety symbol table that identifies the safety symbols that will appear in this manual and on the equipment.

B. Safety Symbol Legend

The use of a lightning bolt within an arrowhead symbol, enclosed in a yellow triangle, indicates warning of dangerous electrical voltage that could cause an electric shock to a person.

The use of an exclamation point within a yellow triangle, indicates to the user that important installation operating and maintenance instructions must be followed.

The use of wavy lines enclosed in a yellow triangle, indicates that the motor can be hot and should not be touched without taking proper precautions.

This symbol instructs one to read the

manufacturer’s instruction manual before installation, operation and maintenance.

This symbol identifies any terminal which is intended for connection to an external grounding conductor for protection against electric shock in case of a fault.

The use of a small case “i” enclosed in a square indicates a general note.

WARNING:

CAUTION:

Indicates a procedure or condition that, if not strictly observed, could result in personal injuries or death.

Indicates a procedure or condition that, if not strictly observed, could result in minor injuries to personnel.

This symbol represents the need to wear hearing protection.

GEI-M1011A

C. Safety Precautions

WARNING: High voltage and rotating parts can cause seri ous or fatal injuries. Installation, operation, and mainte- nance of electric machinery should be performed by qualified personnel. Familiarization with NEMA Publication MG-2, Safety Standard for Construction and Guide for Selection, Installation and Use of Electric Motors and Generators, the National Electrical Code, and sound local practices is recommended.

For equipment covered in this instruction book, it is important to observe safety precautions to protect personnel from possible injury. Among the many considerations, personnel should be instructed to:

• Avoid contact with energized circuits or

rotating parts.

• Avoid bypassing or rendering inoperative any

safeguards or protective devices.

• Avoid use of automatic-reset thermal

protection where unexpected starting of equipment might be hazardous to personnel.

• Avoid contact with capacitors until safe

discharge procedures have been followed.

These instructions do not purport to cover all of the details or variations in equipment nor to provide for every possible contingency to be met in connection with installation, operation, or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser’s purposes, the matter should be referred to the General Electric Company.

• Be sure that the shaft key is fully captive

before the motor is energized.

• Avoid extended exposure in close proximity to

machinery with high noise levels.

• Use proper care and procedures in handling,

lifting, installing, operating, and maintaining the equipment.

• Do not lift anything but the motor with the

motor lifting means.

Safe maintenance practices by qualified personnel are imperative. Before starting maintenance procedures, be positive that:

• Equipment connected to the shaft will not

cause mechanical rotation.

• Main machine windings and all accessory

devices associated with the work area are disconnected from electrical power sources.

If a high-potential insulation test is required, procedure and precautions outlined in NEMA Standards MG-1 and MG-2 should be followed.

Failure to properly ground the frame of this machine can cause serious injury to personnel. Grounding should be in accordance with the National Electrical Code and consistent with sound local practice.

GEI-M1011A

D. INTRODUCTION

General Electric high thrust vertical motors covered by these instructions are carefully constructed of high quality materials and are designed to give long and trouble-free service when properly installed and maintained. These motors are generally used to drive pumps.

Both HOLLOW-SHAFT and SOLID-SHAFT motors are described in this instruction book. Hollow-shaft construction is available in frame sizes 213 and larger whereas solid-shaft construction is available in 182 and larger. Figures 4-6 show typical hollow-shaft high thrust motors and Figures 7-9 show typical solid-shaft high thrust construction. Solid-shaft high thrust motors are not suitable for driving loads that impose significant radial load on the motor shaft; they should not, for example, be

used for belt drive applications.

Figure 9 shows a typical solid shaft high thrust

construction (on right side) for applications requiring continuous up and down thrust capability. In this type of motor, three angular contact ball bearings are mounted in opposed mounting with one bearing oriented to carry up thrust and two oriented to carry down thrust. If greater down-thrust capacity is required, motors may use two standard angular contact ball bearings and one split-race bearing which gives the capacity of 3 bearings down and one bearing up. This does, however, give more endplay than normal.

Motors may be supplied with different bearing arrangements for various external thrust conditions imposed by the pump, such as different magnitudes of down thrust and either momentary or continuous up thrust. This standard construction is for high continuous down thrust and is suitable for momentary up thrust equal to 30% of the rated down-thrust capacity of a high thrust motor. NOTE THAT ANGULAR CONTACT BEARINGS CAN ONLY CARRY THRUST IN ONE DIRECTION.

IN-LINE motors (designed to be mounted on pumps which are directly in the pipe line, and hence called IN-LINE motors) are also covered by this instruction book. These motors have two opposed-mounted angular contact ball thrust bearings at the top end of the motor so they can carry either up or down thrust. The lower guide bearing is a radial-ball type and also carries any radial load imposed by the pump. IN-LINE motors are always of the solid-shaft type. This clamped construction is shown on Figures 7A and 8A.

Spherical roller bearings are sometimes used for applications requiring extra high down-thrust capacity and/or extra bearing life; these bearings may require water cooling. See Figure 10. Motors with spherical roller thrust bearings also require a certain minimum down thrust during all continuous operations.

Since overloading greatly reduces bearing life, the amount of thrust applied should not exceed the recommended values.

This instruction book applies to motors with Totally Enclosed Fan Cooled enclosures as defined by NEMA.

Enclosed motors are characterized by an enclosure and ventilating system that prevents the free exchange of air between the inside and outside of the motor. The air inside the motor is circulated by the rotor fans to carry heat to the enclosed parts, while an external fan blows ambient air over the motor to complete the cooling process.

E. Description of Labels and Nameplates

Motor ratings and identification data are furnished on labels and nameplates. Labels provide basic motor characteristics. Nameplates provide a permanent record of motor characteristics, plant identification and date of manufacture. Below is an example of a label that is attached to the shipping package.

F. Model and Serial Numbers

As discussed in Section E, every motor that is manufactured by GE Industrial Systems will be provided with a model and serial number, which is permanently marked on the motor nameplate and shipping pack. These numbers identify basic motor characteristics and pertinent data. When contacting a GE Industrial Systems Service Shop or representative, please refer to the model and serial number. In the note section of this book, space has been provided for you to record these numbers.

II. RECEIVING, HANDLING, AND STORAGE

Each motor should be carefully examined when received and a claim filed with the carrier for any damage. The nearest office of the General Electric Company may offer guidance.

lift any additional weight. Be careful not to touch overhead power lines with lifting equipment. Failure to observe this warning may result in personal injury or death.

If the motor is not to be installed immediately, it should be stored in a clean, dry location. Precautions should be taken

Figure 1 – Packing Label

WARNING: The motor should be

lifted by the lugs provided. These lugs are intended for lifting the motor only and must not be used to

to prevent the entrance of moisture, dust, or dirt during storage and installation. Precautions are taken by the factory to guard against corrosion. The machined parts are slushed to prevent rust during shipment. Examine the parts carefully for rust and moisture if the equipment is to be stored and reslush where necessary.

Oil-lubricated motors are shipped without oil in the bearing reservoirs. An oil film remains on the bearings, but if the storage period is to exceed three months, the reservoirs should be filled. It is suggested that such oil-filled motors be conspicuously tagged in order to prevent mishandling, which would cause oil spillage and subsequent damage to the internal parts of the motor. When filling for storage, fill to the maximum level shown on the gage or approximately 1 cm (0.5 in.) over the mark showing the standstill level. Before operating the motor, drain this oil and refill with fresh oil.

See instructions under Relubrication for oil recommendations.

The bearings of grease-lubricated motors are greased at the factory with the grease cavity approximately 50% full. Rotate the shaft of all grease-lubricated motors 10-20 revolutions at two month intervals.

During storage, windings should be protected from excessive moisture absorption by some safe and reliable method of heating. Space heaters, if supplied, may be used for this purpose. The temperature of the windings should always be maintained a few degrees above the temperature of the surrounding air. It is recommended that motors in storage be inspected, the windings meggered, and a log of pertinent data kept. Any significant decrease in insulation resistance should be investigated.

If a motor is to be in storage for over one year, it is recommended that competent technical inspection service be obtained to ensure that the storage has been adequate and that the motor is suitable for service. Contact your nearest General Electric Sales office to arrange for inspection service.

A. Unpacking

If the machine or machine parts have been exposed to low temperatures, unpack it only after it has reached the temperature of the room in which it will be unpacked or located; otherwise sweating will occur.

GEI-M1011A

III. INSTALLATION

guards should be installed as needed to protect against accidental contact with moving parts. Machines accessible to personnel should be further guarded by screening, guardrails or other suitable enclosure to prevent anyone from coming into contact with the equipment. This is especially important for motors that are remotely or automatically controlled or have automatic re-setting overload relays, since such motors may start unexpectedly. Failure to observe these precautions may result in injury or death to personnel.

WARNING: Installation should be in accordance with the National Electrical Code and consistent with sound local practices. Coupling

A. Location and Mounting

Allow enough space around the motor to permit free flow of ventilating air and to maintain an ambient temperature not over 40ºC. Where a choice of locations is possible, install the motor so that it will be subjected to the least amount of dirt, dust, liquids, or other harmful materials. Mount the motor securely on a level, firm foundation, align accurately with the driven equipment, and tighten mounting bolts securely.

Because of their special enclosure features, enclosed motors can be operated out-of-doors and in dirty locations.

B. Pump and System Precautions

Some precautions are necessary to assure satisfactory operation of motors in pumping service. The packing gland in the pump head should be kept in good condition so that the liquid being pumped will not be forced out along the shaft and enter the motor through the lower bearing housing.

Motors driving pumps in pressure systems where the pressure is maintained after shutdown should be protected from overspeeding by check valves or non-reverse couplings.

The SYSTEM REED CRITICAL FREQUENCY should be 25% above or below motor operating speed in order to avoid excessive vibration.

C. Alignment of Solid Shaft Motors

Accurate mechanical lineup is essential for successful operation. Mechanical vibration and roughness when the motor is running may indicate poor alignment. In general, lineup by straight edge across, and feeler gages between coupling halves is not sufficiently accurate. It is recommended that the lineup be checked with dial indicators. The space between coupling hubs should be maintained as recommended by the coupling manufacturer.

D. Couplings for Hollow Shaft Motors

1. General

Vertical hollow-shaft motors are designed for driving deepwell, turbine type pumps and can be equipped with either self-release, bolted, or non-reverse couplings as described in the following sections. These couplings are located at the top of the motor and allow pump impeller position to be adjusted easily. The type of coupling is specified by the customer. Remove the top cover and fan casing for access to the coupling

Two slots are provided in the outside rim of the coupling so that a bar can be inserted to keep the assembly from turning while the adjustment of pump impeller clearance is being made. The motor fan must be removed for access to these holes, but fan removal is a normal step during motor installation since it is mounted on the upper half-coupling. A coupling bolt can be screwed into one of the extra tapped holes in the top end shield to provide a stop for the bar.

To prevent breakage, coupling bolts must be tightened to torque values indicated below for bolted or non-reverse couplings.

Required Bolt Torques

Bolt Size (In.) Torque

1/4

5/16

3/8 1/2 5/8 3/4

Note: 1 in. = 25.4 mm

15 N

•m (10 lb-ft)

25 N

•m (20 b-ft)

50 N

•m (37 lb-ft)

120 N

240 N

•m (180 lb-ft)

430 N

•m (320 lb-ft)

960 N

•m (710 lb-ft)

•m (90 lb-ft)

include those instances when the coupling comes mounted in the motor. Failure to comply may cause the coupling blots to break with resultant extensive damage to the equipment.

CAUTION: It shall be the installer’s responsibility in all cases to ascertain that these torque values are used and maintained. This shall

GEI-M1011A

2. Self-Release Couplings

Should the motor accidentally be run in the reverse direction, the pump line-shaft joints may unscrew. The self-release coupling acts to limit the amount of this unscrewing. In normal operation, torque from the motor is transmitted by the lower half-coupling through the driving pins to the upper half-coupling, and then to the pump shaft. If reversal occurs and the pump shaft starts to unscrew and lengthen, the up per half of the self-release coupling is lifted off of the driving pins, thus uncoupling the pump from the motor. See Figures 4-6, where a self-release coupling is shown to the left of the shaft centerline.

NOTE: Self-release couplings cannot carry up-thrust.

To install a motor with a self-release coupling, first lift off the upper half-coupling and the fan attached to it, and remove the fan from the coupling. Then lower the motor onto the pump with pump shaft through motor shaft. Next, set the upper half-coupling into place on the lower halfcoupling and put the gib key in place. Then put the pump shaft nut in place, adjust the pump and lock the nut. Finally, set the fan on top of the upper half-coupling and secure it with its 3 cap screws.

Proper functioning of a self-release coupling depends upon several factors. The pump shaft adjusting nut must be securely attached to the top half-coupling, and the top halfcoupling must not bind on the lower half. Otherwise, the adjusting nut lock-screw may break instead of the coupling halves separating. Should this happen, the motor would continue to unscrew. Serious damage to both motor and line shaft may result. Clearance between the coupling halves should be checked by placing the top half-coupling in position prior to installing the motor. It should drop into place, and rest solidly on the lower half-coupling, without forcing.

Proper alignment of the pump head shaft within the motor hollow shaft is also important. After the coupling releases, it no longer holds the pump shaft centered. If the alignment is not good, the motor shaft which is still rotating may rub the pump shaft which has stopped, and damage will result.

A third requirement is that the distance between the top of the pump shaft and the inside of the top cap be at least enough to allow the top half-coupling, when it tries to release, to clear the pins before the shaft hits the cap. Check this clearance after the adjusting nut has been drawn up to its final position. To facilitate making the check, the motor outline print shows a maximum dimension “XH” from the top of the coupling to the top of the pump shaft. Adhering to this design limit will allow the shaft and coupling to lift enough to clear the pins and still leave a small clearance between the shaft and cap. For standard motors, “XH” is as shown in Table 1.

Frame Size

213-215 50.8 mm (2.00 in.) 254-256 57.15 mm (2.25 in.) 284-286 63.5 mm (2.50 in.) 324-326 95.25 mm (3.75 in.) 364-365 95.25 mm (3.75 in.) 404-405 101.6 mm (4.00 in.) 444-449 111 mm (4.38 in.)

509-5011 123.825 mm (4.88 in.)

Table 1

Depending upon the circumstances causing reversal and upon which line-shaft joint unscrew, there may be enough energy stored in the rotating parts, at the time the coupling clears the pins, to cause the pump shaft to continue to rise and strike the top cap. However, if the above conditions are met, damage, even in the most severe cases, should be limited to a broken top cover or fan.

It is intended that self-release couplings will be called upon to uncouple only infrequently.

NOTE: Anytime a self-release coupling uncouples, it is necessary to remove all power and manually recouple.

Uncoupling is most frequently caused by application of single-phase power after a power supply disturbance, while the motor is being driven in the reverse direction by the pump; this single phase power causes the motor to take over and drive the pump in the reverse direction and the pump shaft joints will then unscrew. To prevent this, select a motor starter which requires a manual start after any stop (rather than allowing automatic re-start as soon as power is applied to the starter), or incorporates a back spin timer to keep power from being automatically reapplied to the motor until enough time has elapsed for water back-flow through the pump to stop and for the motor to completely stop.

Power supply phase-sequence reversal will also cause the motor to reverse and unscrew the pump shaft, but this rarely occurs. An antiphase-reversal relay can be incorporated in the motor controller if desired.

To prevent uncoupling on initial start-up, check motor rotation direction before installing the upper half-coupling to be sure direction is correct. To reverse direction of rotation, interchange any two power leads.

3. Bolted Couplings

Bolted couplings allow up thrust from the pump to be taken by the motor bearings. This type of coupling is similar to a self-release coupling except that the driving pins are replaced by bolts, which should be securely tightened to hold the two halves of the coupling solidly

GEI-M1011A

together so that torque is transmitted by face friction. See Torque Requirements. This type of coupling does not have the self-release feature and allows reverse rotation.

See the self-release coupling shown to the left of the motor center line in Figures 4-6 which is applicable to bolted couplings except that the headless drive pins are replaced by bolts as explained above.

To install a motor with a bolted coupling, first unbolt and remove the fan, thus exposing the coupling bolts. Then unbolt and remove the upper half-coupling. Next, lower the motor onto the pump with pump shaft through the motor shaft. Then set the upper half-coupling into place on the lower half-coupling and put the gib key in place, tightening the bolts. Then put the pump nut in place, adjust the pump and lock the nut. Finally, put the fan in place on the upper half-coupling and secure it with the 3 cap screws provided.

4. Non-Reverse Couplings

The non-reverse type of coupling, as shown to the right of the motor centerline in Figures 4-6, is also a bolted type, and, in addition, it keeps the pump and motor from rotating in the reverse direction. Thus, it not only prevents the pump shaft from unscrewing, but it also prevents damage from over speeding and damage to water lubricated pump shaft bearings, when during shutdown the residual water in the system drives the pump in the reverse direction. This type of coupling also allows up thrust from the pump to be carried by the motor bearings. Motor torque is transmitted to the pump shaft through the two halves of the coupling which are bolted together. See Required Bolt Torques.

To install a motor with a non-reverse coupling, first unbolt and remove the fan, thus exposing the coupling bolts. Next, put the fan bolts back in place to secure the pin retaining plate to the pin carrier and keep the non-reverse assembly from flying apart. Then, unbolt and remove the upper halfcoupling and non-reverse assembly. Next, lower motor onto the pump with pump shaft through the motor shaft. Then set the upper half-coupling and non-reverse assembly into place on the lower half-coupling and bolt it to the lower half-coupling, tightening the bolts. Then install the gib key and pump shaft nut, adjust the pump and lock the nut. Finally, remove the three small cap screws securing pin retaining plate, put the fan in place and secure it with these same cap screws.

The operation of a non-reverse coupling is explained as follows. When the motor is started in the correct or forward direction, the ratchet pins are lifted by the ratchet teeth and are held up by centrifugal force and friction when motor speed becomes high enough. When power is removed, the speed decreases, and the pins fall. At the instant of reversal, a pin will catch on a ratchet tooth and prevent backward rotation. The number of pins differs from the number of teeth to multiply the number of stopping positions.

A very rapid decrease in speed can result in acceleration forces great enough to prevent the pins from dropping. This condition is further aggravated when the pins become dirty and their action sluggish. If the time from shutdown (the instant the “stop” button is pressed) to zero speed is greater than two seconds, operation will be satisfactory.

To permit operation when stopping time is less than two seconds, the pins are spring loaded. For those cases involving cycling (frequent starting and stopping) and stopping times greater than two seconds, the springs may be removed to decrease wear on the ratchet plate.

Pins and springs are made of heat-treated stainless steel.

A complete non-reverse coupling consists of a self-release coupling plus a non-reverse assembly, which includes pin carrier, pins, springs, pin retaining plate, and cap screws.

On motors covered by this instruction book, the ratchet teeth are an integral part of the end shield cover casting.

A self-release or a bolted coupling can be converted to a non-reverse coupling on 324-5011 frame motors without disturbing the adjustment of the pump shaft nut.

The non-reverse assembly will normally be received as a unit. To assemble it onto the motor, unbolt and remove the fan, thus exposing the coupling pins or bolts. Next, remove the drive-pins or bolts from the lower half-coupling. Then slide the non-reverse assembly down over the top halfcoupling. Next, insert the long cap screws through the plate, pin carrier, and top coupling and into the lower coupling. Tighten them securely so that torque will be transmitted by friction between the coupling faces rather than through the bolts. See Required Bolt Torques. Next, remove the three smaller cap screws securing the pin retaining plate to the pin-carrier. Finally, put the fan into place on top of the pin-retaining plate and secure it with the three cap screws just removed. On 213-286 frame machines, the pump shaft nut must be removed and the bolted or self-release coupling replaced with a non-reverse coupling.

The top half of the coupling should seat solidly on the lower half and the pins should touch the bottom of the pockets between the teeth in the ratchet. The clearance between the pin-carrier and the top of the ratchet teeth should be between 1.5 mm (1/16 in.) and 3 mm (1/8 in.).

GEI-M1011A

When installing a non-reverse coupling do not use lubricant. Lubrication will lower the coefficient of friction

between pins and pin carrier, and the pins may not stay up when motor reaches full speed. Motors shipped from stock may have their top couplings and non-reverse assemblies packaged separately. They can be installed as described in previous paragraphs.

E. Power Supply and Connections

1. Wiring and Grounding

with the National Electrical Code and consistent with sound local practices. Failure to observe these precautions may result in damage to the equipment, injury to personnel, or both.

WARNING: Motor and control wiring, overload protection and grounding should be in accordance

Stator winding connections should be made as shown on the connection diagram supplied in the Data pack or as shown on the label attached to the inside of the conduit box cover.

For motors with terminal boards, the standard connection diagrams for three-phase motors of basic design are shown in Figure 2. With all other versions, the respective connection diagram is mounted on the inside of the box cover. Before the conduit box cover is closed be sure that:

a. All terminal box connections are fixed tightly.

b. The minimum air distances are met.

c. The interior of the terminal box is clean and free from foreign materials.

d. Cable openings not used should be closed and the closing screws should be fixed tightly.

e. The gasket in the terminal box cover should be clean and tightly sealed to the cover.

f. The condition of all gaskets should be in accordance to protective regulations.

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