Abstract: A method and template enable the testing of fusion joints of plastic pipes to be conducted by a single operator in the field at the welding site by the efficient and precise extraction from the joints to be tested of a number of high quality tensile coupons. The coupons are tested to failure in a field-suitable, well controlled, self contained, tensile testing apparatus. A narrowing bow-tie-like pattern of the coupon ensures that the failure of the coupon in the tensile test will occur at the narrowest section of the coupon. The template can be visually aligned with the joint to ensure that it is the joint that will be tested.

Abstract: A method and template enable the testing of fusion joints of plastic pipes to be conducted by a single operator in the field at the welding site by the efficient and precise extraction from the joints to be tested of a number of high quality tensile coupons. The coupons are tested to failure in a field-suitable, well controlled, self contained, tensile testing apparatus. A narrowing bow-tie-like pattern of the coupon ensures that the failure of the coupon in the tensile test will occur at the narrowest section of the coupon. The template can be visually aligned with the joint to ensure that it is the joint that will be tested.

Abstract: A heater for use in fusing the end of a branch polyolefin pipe to the side wall of a main polyolefin pipe of specified radius has a first plate with a convex outer surface definable as a surface generated by rotating a first straight line about a first parallel line of origin at a radius equal to the specified radius of the main pipe and a concave inner surface, a second plate with a concave outer surface definable as a surface generated by rotating a second straight line about a second parallel line of origin at a radius equal to the specified radius of the main pipe and a convex inner surface and a heating element of substantially constant thickness disposed in laminar relationship between the first and second plates, the inner surfaces of the plates being contoured so that, with the heating element in laminar relationship therebetween, the lines of origin of the outer surfaces of the plates lie a common plane.