diff --git a/src/app/service-graph/services/d3-helpers/graph-elements.helpers.ts b/src/app/service-graph/services/d3-helpers/graph-elements.helpers.ts
new file mode 100644
index 0000000..bbacbdc
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+++ b/src/app/service-graph/services/d3-helpers/graph-elements.helpers.ts
@@ -0,0 +1,67 @@
+
+/*
+ * Copyright 2017-present Open Networking Foundation
+
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+
+ * http://www.apache.org/licenses/LICENSE-2.0
+
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+import * as d3 from 'd3';
+import {XosServiceGraphConfig as config} from '../../graph.config';
+
+export interface Id3BBox {
+  x?: number;
+  y?: number;
+  width: number;
+  height: number;
+}
+
+export interface IXosGraphHelpers {
+  parseElemClasses (classes: string): string;
+  getBBox(context: any): Id3BBox;
+  getSiblingTextBBox(contex: any /* D3 this */): Id3BBox;
+  getSiblingIconBBox(contex: any /* D3 this */): Id3BBox;
+  getSiblingBBox(contex: any): Id3BBox;
+}
+
+export class XosGraphHelpers implements IXosGraphHelpers {
+  public parseElemClasses (classes: string): string {
+    return angular.isDefined(classes) ? classes.split(' ')
+      .map(c => `ext-${c}`)
+      .join(' ') : '';
+  }
+
+  public getBBox(context: any): Id3BBox {
+    return d3.select(context).node().getBBox();
+  }
+
+  public getSiblingTextBBox(contex: any): Id3BBox {
+    const text: d3.Selection<any> = d3.select(contex.parentNode).select('text');
+    return text.empty() ? {width: 0, height: 0} : text.node().getBBox();
+  }
+
+  public getSiblingIconBBox(contex: any): Id3BBox {
+    return d3.select(contex.parentNode).select('path').node().getBBox();
+  }
+
+  public getSiblingBBox(contex: any): Id3BBox {
+    // NOTE consider that inside a node we can have 1 text and 1 icon
+    const textBBox: Id3BBox = this.getSiblingTextBBox(contex);
+    const iconBBox: Id3BBox = this.getSiblingIconBBox(contex);
+
+    return {
+      width: iconBBox.width + (textBBox.width ? config.node.padding + textBBox.width : 0),
+      height: iconBBox.height
+    };
+  }
+}